JP2569843Y2 - Inlet union for master cylinder - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inlet union for a master cylinder, such as a tandem master cylinder, used in a vehicle brake system.

[0002]

2. Description of the Related Art Conventionally, a tandem master cylinder of this type is provided with a reservoir for directly storing a working fluid and supplying the working fluid to the pressure chamber from the reservoir, or a reservoir mounted on the vehicle body. Are connected via a hose, and a working fluid is supplied from a reservoir to the pressure chamber via the hose. Thus, in the latter tandem master cylinder, an inlet union is provided for supplying a working fluid from a reservoir to each pressure chamber via a hose, and the inlet union has two independent pipe members. ing.

[0003] In other words, such an inlet union has two independent parts each having a fitting part and a flange part.
Each of the pipe members is fitted with its fitting portion into the working fluid supply port of the master cylinder via an annular seal member, and each of the pipe members is attached. The cover is fastened with fixing screws, and the flange is pressed toward the master cylinder side and attached and connected (for example, actual opening 56-39).
351 and Japanese Utility Model Laid-Open No. 58-63161). The working fluid supply port communicates with the pressure chamber of the master cylinder.

[0004]

However, in the conventional inlet union described above, the fitting portions of the pipe members are fitted into the corresponding working fluid supply ports on the master cylinder side, and then together with the mounting cover. When the hose connection direction of each conduit member is different, it is difficult to insert each hose connection part into the mounting hole provided on the upper surface of the mounting cover, which makes assembly work difficult. there were.

[0005] In particular, it is not only easy to prepare a pipe member and a mounting cover for which the hose connection direction is determined in advance as a sub-assembly for each type of vehicle.
It was not possible to freely change the hose connection direction according to the type of vehicle and assemble the hose, and there was a problem that the responsiveness was lacking and the assemblability could not be improved. In addition, it is conceivable to integrally mold the inlet union and the mounting cover with a resin material. However, since the direction of the inlet union differs depending on the type of vehicle, these may not be able to be formed.

[0006] The present invention has been made in view of such circumstances, and its purpose is to ensure good assemblability to the master cylinder and to assemble it securely, thereby improving the work efficiency in the assembling process. It is another object of the present invention to provide an inlet union for a master cylinder capable of freely selecting a hose connection direction.

[0007]

To solve the problems of the prior art SUMMARY OF THE INVENTION In the present invention, the master cylinder and a plurality of sets of pistons and the pressure chamber are juxtaposed in series along the axial direction In a master cylinder inlet union comprising a plurality of independent pipe members for supplying a working fluid from a reservoir to each of the pressure chambers with a common mounting cover, each of the plurality of pipe members includes:
And the flange portion of the outer peripheral surface, located on the reservoir side with respect to the flange portion integrally formed with the carousel of smaller outer diameter than the outer diameter of the flange portion, the outer peripheral surface of the circular shape base low setting a protrusion protruding into <br/> Kutomo one radial only, the upper surface of the mounting cover engages the flange fitting on the outer circumference of the carousel
Part of the inner diameter is smaller mounting hole provided than the outer diameter of the inner peripheral surface of the mounting hole provided with a plurality of recesses corresponding to the circular base of the convex portion of the flange portion, the convex portion of the conduit member side said selectably position the recess of the mounting cover side for engaging and the inner peripheral surface of the mounting cover, forming a fitting portion in which the outer peripheral portion of the flange portion is fitted, the tube according to the fitted and Road members and mounting
At the stage of subassembly with the cover, the connection portion of the pipe member
It is possible to decide the direction .

[0008]

In the master cylinder inlet union according to the present invention, flange portions are provided on the outer peripheral surfaces of a plurality of pipe members independent of each other, and the upper surface of the flange portions on the reservoir side is smaller than the outer diameter of the flange portions. A circular base having an outer diameter is integrally formed, and at least one radially protruding portion is provided on an outer peripheral surface of the circular base, and a mounting hole for the conduit member is formed on an upper surface of the mounting cover. Along with the provision, a plurality of recesses are provided on the inner peripheral surface of the mounting hole corresponding to the protrusions of the circular base of the flange portion, and the recess on the mounting cover side that engages with the protrusion on the conduit member side is selected. Place as possible,
Further, since the fitting portion on which the outer peripheral portion of the flange portion is fitted is formed on the inner peripheral surface of the mounting cover, the convex portion of the circular base is engaged with the concave portion of the mounting hole, and the flange portion is Can be fitted to the inner peripheral surface of the mounting cover, and each pipe member and the mounting cover can be pre-assembled as a subassembly. Moreover, the fitting and removal of the conduit member and the mounting cover, and the engagement and disengagement of the concave and convex portions thereof can be easily performed, and the concave portion on the mounting cover side is selected to engage the convex portion on the conduit member side. In order to gain, even in the case of sudden changes in the model,
At the stage of the subassembly, the hose connection direction of the pipe member can be freely changed, and it is possible to cope quickly and easily.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the illustrated embodiments.

1 to 7 show an embodiment of an inlet union for a master cylinder according to the present invention, FIG. 1 is a sectional view thereof, FIG. 2 is a plan view of FIG. 1, and FIG. 3 is a pipe member and a mounting cover. FIG. FIG. 4 is a view showing the mounting cover, FIG. 4 (A) is a plan view thereof, FIG. 4 (B) is a sectional view taken along line BB of FIG. 4 (A), and FIG. FIG. 5 is a partially enlarged view of a portion C in FIG. 4B, FIG. 6 is a partial cross-sectional view showing a fitted state of the pipe member and the mounting cover, and FIG.
FIG. 4 is a front view of a coupling pin.

In FIG. 1, reference numeral 1 denotes a tandem master cylinder in which a plurality of pistons 2, 2 and pressure chambers 3, 3 are arranged in series along the axial direction of the cylinder.
In a master cylinder 1 of this type, a plurality of sets of pistons 2 and pressure chambers 3 are alternately arranged (one piston 2 and one pressure chamber 3 constitute one set, and in this embodiment, two sets are provided). Is shown). The tandem master cylinder 1 has a cylinder body 4 formed in a substantially cylindrical shape. The upper side of the cylinder body 4 is used to supply hydraulic fluid to each of the pressure chambers 3 from a reservoir (not shown). Are provided at intervals in the axial direction of the cylinder. In addition, the hydraulic fluid supply ports 5 and 6 are provided with pipe members 7 and 8 which are independent from each other, to a common mounting cover 1 described later.
1, respectively.

The pipe members 7 and 8 are integrally formed using a material such as a synthetic resin material (for example, nylon), and the inside thereof is penetrated. These pipe members 7, 8 are fitted into fitting portions 7a, 8 provided on one end side.
a, mounting flange portions 7b, 8b provided on the outer peripheral surface at an intermediate position, and circular tables 7c, 8c integrally formed on the upper surface of the flange portions 7b, 8b located on the reservoir side.
And a hose connection portion 7 having a substantially L-shaped section provided on the other end side.
d, 8d.

The fitting portions 7a and 8a are provided with annular sealing members 9 and 8 at the corresponding hydraulic fluid supply ports 5 and 6 of the cylinder body 4.
10 to be connected to the tandem master cylinder 1 by being fitted therein, and to hose connection portions 7d, 8
d is connected to a reservoir (not shown) attached to the vehicle body via a connection hose (not shown).

The mounting flanges 7b, 8b have an outer diameter corresponding to the diameter of the inner peripheral surface of the mounting cover, which will be described later, and the circular bases 7c, 8c on the upper surface thereof have the flanges 7b, 8b. Is formed with an outer diameter smaller than the outer diameter.
A plurality of (four in this embodiment, but at least one) protrusions 7e, 8e projecting in the radial direction are provided along the circumferential direction on the outer peripheral surface of the circular bases 7c, 8c. The protrusions 7e and 8e are provided at regular intervals, and are arranged to face each other. These projections 7e, 8
“e” is provided for positioning the rotation direction of the pipe members 7 and 8, and is formed in a spur gear tooth shape.

On the other hand, the mounting cover 11 is for simultaneously attaching and connecting the pipe members 7 and 8 fitted to the hydraulic fluid supply ports 5 and 6 of the cylinder body 4 to the tandem master cylinder 1 and is made of a synthetic resin material. (Eg, polypropylene) is integrally formed using a material such as polypropylene. The mounting cover 11 is formed in a substantially elliptical planar shape extending along the axial direction of the cylinder, so that the mounting cover 11 can be disposed between the hydraulic fluid supply ports 5 and 6 of the cylinder body 4.

Further, both sides of the upper surface of the mounting cover 11 (FIGS.
At the left and right sides in FIG. 6, mounting holes 1 through which the respective pipe members 7, 8 on the hose connection portions 7d, 8d side are inserted.
2, 13 are drilled, and as shown in FIG.
12 and 13, fitted to carousel 7c, the outer periphery of 8c, the inner diameter
Is smaller than the outer diameter of the flange portions 7b, 8b,
Each pipe member while being mounted by the mounting cover 11
Keep 7 and 8 out . A plurality of (eight in this embodiment) recesses 15 are provided on the inner peripheral surfaces of these mounting holes 12 and 13 in correspondence with the projections 7e and 8e provided on the circular bases 7c and 8c of the flanges 7b and 8b. , 16 are provided.
That is, the concave portions 15 and 16 are arranged at regular intervals along the circumferential direction, and are always provided in a larger number than the number of convex portions 7e and 8e of the circular bases 7c and 8c. The spur gear is formed in a tooth shape corresponding to the protrusions 7e and 8e.

The direction .theta. Of the hose connection 7d or 8d of each of the pipe members 7 and 8 is set in the recess 15 of the mounting cover 11 which engages with the projections 7e and 8e of the pipe members 7 and 8. ,
By selecting 16 and changing the engagement position, it can be changed as appropriate for different types of vehicles.
The direction θ of the hose connection portion 7d shown in FIG. 2 indicates a horizontal angle formed by the center axis of the hose connection portion 7d and the axis of the cylinder.

Further, the mounting hole 11 is provided in the mounting cover 11.
Concave portions 14a, 14b are formed corresponding to the installation positions of 2 and 13, respectively. As shown in FIG. 5, a projection 21 is formed on the inner peripheral surface of each of the recesses 14a and 14b so as to partially project in a direction facing each other. Are fitting portions of the flange portions 7b, 8b of the pipe members 7, 8. Therefore, the protrusion 21 is provided at a position corresponding to the thickness of the flanges 7b, 8b, and is formed to prevent the flanges 7b, 8b from being pressed and fitted. The protrusion 21 has a tapered surface 21a whose diameter gradually increases toward the entrance side of the mounting cover 11, and the outer diameters of the flanges 7b and 8b are rebounded by the tapered surface 21a. It is configured so that it can be manually press-fitted and fitted against the repulsion.

That is, the pipe members 7, 8 and the mounting cover 11 can be assembled in advance as a subassembly, and the main part in the fitted state is a partial sectional view of FIG. Is shown in

On the other hand, at the center of the mounting cover 11,
As shown in FIG. 4, the connecting portions 17 and 18 are attached to the mounting cover 1.
1 are fixed to the tandem master cylinder 1, and insertion holes 17 a, 18 a through which the connection pin 20 is inserted are formed on both sides of the connection portions 17, 18. Further, the coupling pin 20 is inserted into the insertion holes 17a, 18
a on the space passage through which the insertion holes 17a,
At an intermediate position of 18a, an engaging tongue piece 19 is protruded downward from the upper surface in FIG. In addition, two insertion holes 1
The inner diameter of one of the insertion holes 17a is smaller than that of the other insertion hole 18a, and the peripheral portion of the insertion hole 17a engages with the step 20a of the coupling pin 20 to be inserted. It is a stopper.

As shown in FIG. 7, the connecting pin 20 has a stepped portion 20a in the vicinity of the leading end thereof, so that the outer diameter of the leading end 20b inserted into the insertion hole 17a is formed smaller than the outer diameter of the pin. , Tongue piece 19 of mounting cover 11
A groove portion 20c is provided at a position corresponding to the above so that the tip of the engaging tongue piece 19 is engaged.

On the other hand, as shown in FIGS. 1 and 2, the cylinder body 4 of the tandem master cylinder is provided with a mounting portion 4a for fixing the mounting cover 11.
The mounting portion 4a is connected to the connecting portions 17 and 1 of the mounting cover 11.
8 are arranged. The mounting portion 4a is provided with a through hole 4b which is arranged so as to be coaxial with the through holes 17a and 18a of the coupling portions 17 and 18 when fixed.

In order to assemble the inlet union constructed as described above, first, the hose connecting portions 7d and 8d of the pipe members 7 and 8 in the state shown in FIG. , And 13 respectively. Then, the convex portions 7e, 8e of the circular bases 7c, 8c are engaged with the concave portions 15, 16 of the appropriately selected mounting holes 12, 13, and the flange portions 7b, 8b are engaged with the concave portions 14a, 14b of the mounting cover 11. The flanges 7b and 8b are fitted and fixed between the upper surface of the mounting cover 11 and the protrusions 21 by pushing the protrusions 21 and riding over the protrusions 21.
A subassembly in which the direction θ of 8d is at a predetermined position is set.

After that, the mounting holes 12 of the mounting cover 11,
13, flange portions 7b, 8 of conduit members 7, 8
While pressing b, the fitting portions 7a and 8a are fitted into the corresponding hydraulic fluid supply ports 5 and 6 of the cylinder body 4, respectively. Next, the insertion holes 17a, 18a of the coupling portions 17, 18 in the mounting cover 11 and the mounting portions 4 in the cylinder body 4 are formed.
If the mounting cover 11 and the cylinder body 4 are fixed by arranging the through-holes 4b on the same axis and fitting the coupling pins 20 into these holes, the pipe members 7, 8 can be mounted on the mounting cover. 11 (see FIGS. 1 and 2).

At the time of insertion of the connecting pin 20, the tip 20b is inserted through the insertion hole 18a on the side A of the mounting cover 11 shown in FIG. Until it contacts the peripheral edge stopper. At the same time, when the tip of the engaging tongue piece 19 of the mounting cover 11 is engaged with the groove 20c of the connecting pin 20 by its resilient force, the connecting pin is engaged by the engaging action of the engaging tongue piece 19 on the groove 20c. 20 is prevented from falling out and will not fall off.

In order to remove the mounting cover 11 from the tandem master cylinder 1, the mounting cover 1 shown in FIG.
A thin rod (not shown) is pressed against the front end face of the coupling pin 20 from the side B of the first side. Along with this, the tip of the engaging tongue piece 19 is elastically deformed, and detaches from the groove 20c of the connecting pin 20 to release the connecting, so that the connecting pin 20 can be taken out, and the mounting cover 11 Can be removed from the tandem master cylinder 1.

In the inlet union of this embodiment, the circular base 7 provided on the flanges 7b, 8b of the pipe members 7, 8
The projections 7e and 8e of the mounting covers 11 and 8c
The pipe members 7, 8 are engaged with the recesses 15, 16 of the mounting cover 11 and the recesses 14 a, 14 b of the mounting cover 11. The mounting cover 11 and the mounting cover 11 can be securely assembled in advance as a subassembly, and the assembling operation can be performed with one touch. Also, the hose connection direction can be freely changed at the stage of sub-assembly by engaging the projections 7e, 8e on the pipe members 7, 8 with the selected recesses 15, 16 on the mounting cover 11 side. The use of the inlet union of the present embodiment makes it possible to quickly and easily respond to sudden changes in the vehicle type.

8 to 12 show another embodiment of the inlet union for a master cylinder according to the present invention, FIG. 8 is a sectional view thereof, FIG. 9 is a plan view of FIG. 8, and FIG. 11 is a perspective view showing the mounting cover, and FIG. 11 is a partial cross-sectional view showing a fitted state of the pipe member and the mounting cover. FIG. 12 is a plan view of FIG.

The flange portions 7 of the pipe members 7, 8 in the drawing
b, 8b, on the upper surface of the same circular table 7c,
8c are integrally formed, and these circular bases 7c, 8c
A plurality (two in this embodiment) of protruding portions 7e, 8e projecting in the radial direction are provided at regular intervals along the circumferential direction on the outer peripheral surface of c. 8e are arranged opposite to each other. In addition, circular stand 7
c, 8c are provided with engaging members 22, 23 extending in the radial direction with the hose connection portions 7d, 8d interposed therebetween, and these engaging members 22, 23 are provided with two corresponding convex portions 7e, 8
e is located at an intermediate position.

Further, a tooth portion 22 formed in the same shape as the projections 7e, 8e is provided at the lower part of the distal end surfaces of the engagement members 22, 23.
a, 23a are provided, and the tooth portions 22a, 23a
Protrudes from the outer peripheral surfaces of the circular bases 7c, 8c by the same length as the protrusions 7e, 8e, and positions the pipe members 7, 8 in the rotational direction similarly to the protrusions 7e, 8e. And, on the upper part of the teeth 22a, 23a, the teeth 22a,
Protrusions 22b and 23b are provided that protrude further in the radial direction than 23a and the protrusions 7e and 8e.

The protruding pieces 22b and 23b are provided to prevent the pipe members 7 and 8 from dropping off the mounting cover 11. For this reason, the projecting pieces 22b, 2
3b, as shown in FIG. 11 and FIG.
8 is arranged on the upper surface side of the mounting cover 11 in a state of being fitted to the mounting cover 11, and the lower surface thereof is configured to engage with the upper surface of the mounting cover 11. On the other hand, on the inner peripheral surfaces of the mounting holes 12 and 13 of the mounting cover 11, circular stands 7c,
8c and the protruding portions 7e and 8e and the tooth portions 22a and 2
A plurality of (six in this embodiment) recesses 1 corresponding to 3a
5 and 16 are provided respectively. Note that α and β in FIG. 9 represent the directions of the hose connection portions 7d and 8d, and the directions α and β of these hose connection portions 7d and 8d correspond to the center axis of the hose connection portions 7d and 8d and the axis of the cylinder. Indicates the horizontal angle formed by Other configurations and assembling methods are almost the same as those in the above embodiment.

In the inlet union of this embodiment, the circular base 7 provided on the flanges 7b, 8b of the pipe members 7, 8
c, 8c and the teeth 22a, 23a of the engaging members 22, 23 with the mounting holes 12, 1 of the mounting cover 11.
3 and the lower surfaces of the projecting pieces 22b and 23b of the engaging members 22 and 23 are engaged with the upper surface of the mounting cover 11, so that substantially the same effects as in the above embodiment are obtained. In addition, the pipe members 7, 8 can be reliably prevented from falling out of the mounting cover 11. Also,
Since the circular bases 7c and 8c are provided with the engaging members 22 and 23, the strength of the pipe members 7 and 8 in the rotation direction can be increased as compared with the above-described embodiment.
Grommets can be prevented from entering between the mounting cover 11 and the cylinder body 4.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications and changes can be made based on the technical concept of the present invention.

For example, the number of the projections 7e, 8e and the engagement members 22, 23 on the pipe member 7, 8 side in the above-described embodiment,
The number of the concave portions 15 and 16 on the side of the mounting cover 11 is not limited to that of the present embodiment, and can be appropriately selected according to the applicable model.

[0035]

As described above, the master cylinder inlet union according to the present invention is applied to a plurality of pipe members.
A flange having an outer diameter smaller than the outer diameter of the flange portion, which is located on the reservoir side with respect to the flange portion, and integrally formed with the circular portion. At least one radially protruding projection is provided on the outer peripheral surface of the base, and the upper surface of the mounting cover is fitted to the outer circumference of the circular base and has a diameter greater than the outer diameter of the flange.
Also provided a mounting hole having a small inner diameter , provided on the inner peripheral surface of the mounting hole a plurality of concave portions corresponding to the convex portion of the circular base of the flange portion,
A concave portion on the mounting cover side that engages with the convex portion on the conduit member side is selectably arranged, and a fitting portion on which the outer peripheral portion of the flange portion is fitted is formed on the inner peripheral surface of the mounting cover, and is applied in advance. since it is possible to prepare a pipe member and a mounting cover hose connecting direction is determined for each vehicle type as easily subassembly thereby quickly and reliably without a skilled assembling work to the master cylinder The mounting hole provided on the upper surface of the mounting cover is
Since the inner diameter is smaller than the outer diameter of the flange
When the mounting cover is attached to the cylinder,
Therefore, the pipe member is prevented from coming off and attached, and the assembling property can be improved.

In the inlet union of the present invention,
When carrying or assembling, the pipe member and the mounting cover do not fall apart, and the fitting and removal of the pipe member and the mounting cover, and the engagement and disengagement of the concave and convex parts of both of them, according to the applicable vehicle model Because it can be easily performed, handling is convenient, and even if there is a sudden change of vehicle type, it is possible to freely change the hose connection direction of the pipe line member at the subassembly stage and smoothly assemble it to the master cylinder. Can,
Work efficiency can be improved in the assembly process.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an inlet union for a master cylinder according to an embodiment of the present invention.

FIG. 2 is a plan view showing the inlet union.

FIG. 3 is a perspective view showing a pipe member and a mounting cover constituting the inlet union.

FIG. 4 is a view showing the mounting cover, and FIG.
4B is a plan view, FIG. 4B is a sectional view taken along line BB of FIG. 4A, and FIG. 4C is a bottom view thereof.

FIG. 5 is a partially enlarged view of a portion C in FIG. 4 (B).

FIG. 6 is a partial cross-sectional view showing a fitted state of the pipe member and the mounting cover.

FIG. 7 is a front view showing a connecting pin for mounting the mounting cover on a master cylinder.

FIG. 8 is a sectional view showing an inlet union for a master cylinder according to another embodiment of the present invention.

FIG. 9 is a plan view showing the inlet union.

FIG. 10 is a perspective view showing a pipe member and a mounting cover which constitute the inlet union.

FIG. 11 is a partial cross-sectional view showing a fitted state of the pipe member and the mounting cover.

FIG. 12 is a partial plan view showing a fitted state of the pipe member and the mounting cover.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Tandem master cylinder 2 Piston 3 Pressure chamber 4 Cylinder main body 5, 6 Hydraulic fluid supply port 7, 8 Pipe line member 7a, 8a Fitting part 7b, 8b Flange part 7c, 8c Circular base 7d, 8d Hose connection part 7e, 8e Convex Part 11 Mounting cover 12, 13 Mounting hole 14a, 14b Depressed part 15, 16 Depressed part 21 Projection ( fitting part ) 22, 23 Engaging member 22a, 23a Tooth part 22b, 23b Projection part

Claims (2)

(57) [Scope of request for utility model registration] 1. A plurality of independent pipelines for supplying a working fluid from a reservoir to each pressure chamber to a master cylinder in which a plurality of sets of pistons and pressure chambers are arranged in series along the axial direction. In the master cylinder inlet union where the members are mounted by a common mounting cover,
Each of the plurality of pipe members has a flange portion on an outer peripheral surface.
When located in the reservoir side with respect to the flange portion integrally formed with the carousel of smaller outer diameter than the outer diameter of the flange portion, at least one radially on the outer peripheral surface of the circular shape base only setting the protrusion protruding into the the upper surface of the mounting cover
Fits on the outer circumference of the circular base and has an inner diameter larger than the outer diameter of the flange
The mounting cover is a mounting hole provided small, the inner peripheral surface of the mounting hole provided with a plurality of recesses corresponding to the circular base of the convex portion of the flange portion, which engages with the convex portion of the conduit member side Side recess is selectably arranged, and on the inner peripheral surface of the mounting cover,
Forming a fitting portion to which an outer peripheral portion of the flange portion fits,
The sub-assembly between the pipe member and the mounting cover by this fitting is provided.
At the stage of assembly, it is possible to determine the direction of the connection part of the pipe member
Inlet union master cylinder, characterized in that the. 2. A projecting part which is provided on the circular base of the pipe member so as to protrude further in the radial direction than the convex part, and wherein the pipe member is fitted to the mounting cover, the projecting part is provided. 2. An inlet union for a master cylinder according to claim 1, wherein a lower surface of said projection is engaged with an upper surface of said mounting cover by arranging the upper surface of said mounting cover on the upper surface side of said mounting cover.