JP2569348Y2 - Fluid bearing - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluid bearing for supporting a rotating shaft by the pressure of an incompressible working fluid such as a working oil .

[0002]

2. Description of the Related Art Many fluid bearings are known in which a rotating shaft is lifted from a bearing surface by the pressure of a working fluid supplied from the outside, and the rotating shaft is supported in a non-contact manner with the bearing surface.
According to Japanese Utility Model Publication No. 62-14417, a bearing metal having a plurality of fluid pockets engraved on an inner peripheral surface thereof is internally fitted and held by shrink fitting or cold fitting. A plurality of fluid passages extending in the radial direction from the peripheral surface of the bearing body and extending radially inward from the peripheral surface of the bearing body to communicate with each of the fluid pockets are formed in the axial direction. The throttle members are formed in a row at intervals, and the throttle member is inserted and set from the opening on the peripheral surface of the main body of each fluid passage to a position beyond the main passage, and then a plug is screwed into the opening of each fluid passage. One in which these openings are closed is known.

[0003]

The fluid pressure in the plurality of fluid pockets must be individually controlled to cope with fluctuations in radial load and the like.
One throttle member cannot be shared by a plurality of fluid pockets. In the conventional fluid bearing disclosed in the above publication, the fluid passages provided with the throttle members are formed in a single row in the axial direction along the main passage. Therefore, when the number of fluid pockets is increased, the same number of fluid pockets is required. In securing the space for forming the fluid passage, the axial length of the bearing metal becomes longer than necessary,
There is a problem that the fluid bearing becomes large. When the plug and the throttle member are connected to each other so that the throttle member can be replaced by changing the specification of the bearing or the like, when the plug is attached or detached, the cutting remaining on the plug or the threaded portion to be screwed with the plug is performed. Foreign matter such as powder or a sealing material may enter the main passage or the fluid passage, block the throttle member or invade the bearing surface to cause seizure.

[0004] In view of the above problems, the present invention provides a fluid bearing that can reduce the size of the bearing body and that does not contain foreign matter in the working fluid when the throttle member is replaced. With the goal.

[0005]

In order to achieve the above object, the present invention comprises a bearing metal which is fitted and held in a bearing body, and supplies a plurality of fluid pockets formed on a bearing surface of the bearing metal. A fluid bearing for supporting a rotating shaft by the pressure of an incompressible working fluid, wherein a plurality of fluid passages for supplying a working fluid to these fluid pockets are formed in a bearing body, and each of the fluid passages is formed. in those interposed each stop member, the end face of the bearing body, against the outer circumferential surface of the bearing metal
A plurality of recesses are formed at intervals in the circumferential direction so as to face each other, and the plurality of fluid passages are respectively provided with an upstream portion and a downstream portion of each fluid passage through each of the recesses. Are formed so as to communicate with each other, and while inserting each aperture member into each of the concave holes,
A plug for closing the opening of the bearing body end face of each of the recesses is formed integrally with each of the throttle members, and the respective throttle members are brought into contact with the stoppers of the respective throttle members on the bearing body so that the respective throttle members are formed with the respective recesses. A pressure member for pressing and fixing the inside of the fluid passage is attached , and furthermore, a downstream portion of the fluid passage.
A detection port for detecting the minute pressure .

[0006]

In the fluid bearing according to the present invention, the throttle member provided for each fluid pocket is inserted and fixed in a plurality of recesses formed at intervals in the circumferential direction on the end face of the bearing body.
Even if a large number of fluid pockets are provided, the axial length of the bearing metal will not be unnecessarily extended. Also, the stopper member is integrally formed with a stopper for closing the opening of the end face of the bearing body of each recess, and the stopper member is pressed and fixed by the pressing member. There is no need to provide the working fluid in the working fluid. Note that the pressure on the downstream side of the fluid passage
The rotating shaft is supported so that it does not contact the bearing metal.
Therefore, when the pressure of the working fluid decreases, the rotating shaft
There is a risk of burning due to contact with the receiving metal. So, on
If the pressure of the working fluid drops
Immediate measures such as stopping rotation were taken. Also,
The end face of the bearing body should face the outer peripheral surface of the bearing metal.
A plurality of concave holes are formed at intervals in the circumferential direction
By inserting the throttle member into the hole, the throttle member
It is arranged so as to surround the outer peripheral surface of the tool. This allows the aperture
The length required for mounting the bearing metal even if the member is mounted
No more.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. Reference numeral 1 denotes a bearing body of a fluid bearing according to the present invention. The bearing body 1 includes a cast iron outer cylinder 2 and a plurality of bolts 30a inserted into the outer cylinder 2 by a flange portion 30 provided at one end. And an inner cylinder 3 made of carbon steel fastened to the outer cylinder 2 with a spindle shaft 5 on the inner peripheral surface of the inner cylinder 3.
A bearing metal 4 made of a lead-bronze casting is fitted by shrink fitting or the like.

An oil supply port 21 to which hydraulic oil is supplied is provided at the upper part in the circumferential direction of the outer cylinder 2. The oil supply port 21 is formed in an annular groove 35 formed on the outer peripheral surface of the inner cylinder 3. Communicating. The annular groove 35 is formed between a plurality of oil pockets 41 formed on the inner peripheral bearing surface of the bearing metal 4 and an oil pocket 43 provided on the thrust surface 42 of the bearing metal 4 through respective oil passages. In detail, a plurality of concave holes 31 are formed in a predetermined circumference on the end surface of the inner cylinder 3 on the flange portion 30 side at intervals in the circumferential direction. 35 communicates with the respective recesses 31 through respective axial communication holes 31a constituting the upstream portion of the respective oil passages formed in the inner cylinder 3. Further, among these recesses 31, in FIG. Those shown in the figure communicate with the oil pockets 41 via the respective communication ports 31c constituting the downstream portion of each oil passage extending radially inward from the concave hole 31, and those shown in S represent radially inward directions. To the communication port 31d and bearing metal 4 Communicates with the oil pocket 43 provided on the thrust surface 42 of the bearing metal 4 through the axial passage 42a which form. Further, on the peripheral surface of the flange portion 30, each detection port 31b extending radially outward from each of the concave holes 31 is opened, and each of the detection ports 31b is connected to a detection pipe 3 connected to a pressure sensor (not shown).
3 is connected. And in each of these concave holes 31,
A plug portion 61 for closing the opening of the concave hole 31 and a communication hole 31a
A throttle member 6 having a throttle portion 62 for narrowing the hydraulic oil from above is inserted, and the throttle member 6 is pressed by the annular projection 32b of the ring member 32 which is a pressing member fastened to the inner cylinder 3 by a bolt 32a. The distal end surface 63 of the aperture member 6 is brought into contact with a step 35b between the concave hole 31 and the communication hole 31a, and is pressed and fixed so as not to fall out of the inner cylinder 3. The end surface of the throttle member 6 on the side of the plug 61 is provided with the throttle member 6.
A tap 64 is provided for pulling out from the concave hole 31. In the present embodiment, five pieces shown by R and two pieces shown by S are provided. By the way, the spindle shaft 5
A cap 51 serving as a mounting seat for a grindstone (not shown) is fastened to the left end face of the fluid bearing. The cap 51 cooperates with the ring member 32 to form a labyrinth seal. It is configured to prevent intrusion of grinding oil and the like into the inside.

According to the above configuration, the plurality of throttle members 6 are arranged on the end face of the bearing main body 1 at intervals in the circumferential direction, so that the axial length of the bearing metal 4 becomes longer than necessary. The fluid bearing body can be reduced in size without
Since the aperture member 6 is pressed and fixed by the ring member 32 in a state where the opening end of the concave hole 31 is closed, it is not necessary to close the open end of the concave hole 31 using a plug. There is no concern that foreign matter such as remaining chips may be mixed.

In the above embodiment, the bearing body 1 is connected to the outer cylinder 2 and the inner cylinder 3 in order to improve the exchangeability of the bearing metal 4 while maintaining the fitting force between the bearing body 1 and the bearing metal 4.
However, the bearing main body 1 may be formed of a single cylindrical body, and the bearing metal 4 may be directly fitted therein. In this case, the annular groove 35 is engraved in advance on the inner peripheral surface of the cylindrical hole of the bearing body 1 in which the bearing metal 4 is fitted.

[0011]

As is clear from the above description, the hydrodynamic bearing according to the present invention does not become unnecessarily large.
In addition, since no foreign matter is mixed into the working fluid when the throttle member is replaced or the like, there is no possibility of seizure or the like. In addition, detection ports
The pressure of the working fluid is detected by the
And the rotating shaft may come into contact with the bearing metal.
In addition, measures such as stopping rotation can be taken immediately.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line II-II in FIG.

FIG. 3 is an enlarged sectional view showing an attached state of a diaphragm member.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Bearing main body 2 Outer cylinder 3 Inner cylinder 4 Bearing metal 5 Spindle shaft 6 Throttle member 31 Concave hole 32 Ring member 41 Oil pocket 61 Plug part 31a Communication hole (upstream side of fluid passage) 31c / 31d Communication port (downstream of fluid passage) Side) 33 Detection tube 31b Detection port

 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Tetsuharu Komatsu 1-10-1 Shinsayama, Sayama City, Saitama Prefecture Honda Engineering Co., Ltd. (56) References JP-A-3-249424 (JP, A) Sho Akai 51-83544 (JP, U)

Claims (1)

(57) [Scope of request for utility model registration] 1. A rotating shaft is supported by a pressure of an incompressible working fluid supplied to a plurality of fluid pockets formed on a bearing surface of the bearing metal. A fluid bearing, in which a plurality of fluid passages for supplying a working fluid to these fluid pockets are formed in a bearing body, and a throttle member is interposed in each of the fluid passages. , Bearing metal outer peripheral surface
A plurality of recesses are formed at intervals in the circumferential direction so as to be opposed to each other, and the plurality of fluid passages are respectively provided on the upstream portion and the downstream portion of each fluid passage via the respective recess. Are formed so as to communicate with each other, and each of the throttle members is inserted into each of the concave holes, and a plug portion for closing the opening of the bearing body end face of each of the concave holes is integrally formed with each of the throttle members, And, a pressing member is attached to the bearing body to abut against the plug portion of each of the throttle members and press and fix the respective throttle members into the respective recesses, and further, on the downstream side of the fluid passage.
A fluid detection bearing provided with a detection port for detecting the pressure of the portion .