JPS5965664A - Gear device - Google Patents

Abstract

PURPOSE:To aim at improvement of shock resistance, compact size, and reduction of noise, by arranging a buffering member between a projecting portion of a gear and a projecting portion of an engagement member, so as to transmit rotational force with the buffering member compressed. CONSTITUTION:A wheel 14 is provided with wheel teeth on an outer circumferential surface thereof, and projecting portions 14b1 and 14b2 are extended toward a central rotary shaft in the same diametrical direction. A rubber cushion 15 is formed with four buffering portions 15a1-15a4. The projecting portion 14b1 is tightly fitted between the buffering portions 15a1 and 15a2, while the projecting portion 14b2 is tightly fitted between the buffering portions 15a3 and 15a4. A projecting portion 16a1 of an engagement member 16 is tightly fitted between the buffering portions 15a1 and 15a4, while a projecting portion 16a2 of the engagement member 16 is tightly fitted between the buffering portions 15a2 and 15a3. The four buffering portions 15a1-15a4 are formed integrally with a thin connecting portion 15b. The engagement member 16 is connected to an end of a rotary shaft 17.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a gear device, and more particularly to a gear device that buffers the impact of gear meshing portions during power transmission through gear connections.

Gear connections have a wide variety of uses, and in recent years, many on-vehicle mechanisms are being automated electrically.For example, seat reclining, forward/backward movement, up/down movement, opening/closing of side windows and roof panels, etc. are powered by electrical mechanisms. It is said that

In this type of application, it is desired that the electric mechanism is small13 and that there is no vibration or drive shock.

Therefore, in the past, it has been proposed to couple the gear to the rotating shaft via a spring member. A conventional example is shown in Part 1a.
As shown in Figures 1c to 1c. FIG. 1a is a front view, FIG. 1b is a sectional view taken along line IB-TB in FIG. 1a, and FIG. 1c is a rear view.

There are teeth 2 cut on the outer peripheral surface of the gear (wheel) 1.
The gear 1 is roughly ring-shaped, but has a fan-shaped notch 3 that receives the upright ends 41+42 of the ring-shaped spring 4. The upright end 42 of is in contact with it. A fan-shaped notch 6 is also formed in the stay 5, and the upright ends 41 and 4□ of the spring 4 are also fitted into this notch 6. The ring-shaped part of the spring 4 is sandwiched between the stay 5 and the plate 7, and the holder 8
Pass the tips of the three legs through the holes in play 1 and stay 5, spread the tips with a press, and attach stay 5. The plays 1 to 7 and the holder 8 are integrated. The ring-shaped spring 4 is the upright part 4
1 + 42, is expandable and retractable in the circumferential direction, and engages with gear 1.

In this example, the play 1-7 and holder 8 have a rotating shaft (
A hole 9 is drilled to connect the plate 7 (not shown), and rotation of the gear is transmitted via the ring spring 4 and the stay 5 to the plate 7.
and is transmitted to the holder 8, and the rotation ΦIll rotates together with the rotation of the play 1-7 and the holder 8. When the rotating shaft is driven, the gear 1 is rotationally driven by the ring-shaped spring 4.

If the gear 1 is rotationally driven in the clockwise direction in Figure 1a, at the beginning of the drive, the gear 1 will rotate the upright portion 4 of the ring-shaped spring 4.
1 is pushed clockwise, and the spring's standing portion 42 tries to push the stay 5 clockwise, but since the load side (stay 5 - plate 7 - holder 8 - rotating shaft) is stopped, the spring 4 It contracts in the circumferential direction, and as the contraction progresses, the force of the standing portion 42 pushing the stay 5 clockwise increases, and the load side begins to rotate.

In this way, the ring-shaped spring 4 buffers the instantaneous force transmission at the start of driving, softening the shock.

In such a conventional gear device, since the mechanical shock at the start of driving is large, the strength of the ring-shaped spring 4 is increased and the stay 5. The integral connection between the plate 7 and the holder 8 is also required to be strong, and there is a problem that the structure is large and is likely to generate noise. It was difficult to downsize.

SUMMARY OF THE INVENTION An object of the present invention is to provide a buffer gear device that has high mechanical strength, particularly impact resistance, can be configured in a compact size, and has low noise.

In order to achieve the above object, in the present invention, a protrusion that protrudes in the radial direction and in the direction along the rotation center axis is formed on the gear, and the engagers corresponding to the conventional stays 5 to holders 8 also have similar protrusions. In terms of shape, a buffer member made of a solid elastic material such as rubber or synthetic resin is disposed between the protrusion of the gear and the protrusion of the engager, that is, in the gap in the circumferential direction of rotation.

According to this, the rotational force is transmitted in the form of compressing the buffer member, so that the shock is small, the noise is small, the structure is small, and the shock resistance is high.

Embodiments and an application example of the present invention will be described below with reference to the drawings.

FIG. 2a shows a wall 4-wheel unit incorporating one embodiment of the present invention. This unit is used as an electric mechanism for a seat reclining mechanism. A motor 11 and a rotational pulse generator (Hall IC unit) 12 are coupled to the gear housing 10 .

The interior of the gear housing 10 is shown in FIGS. 2b and 2c. A worm 13 is coupled to the rotating shaft of the motor 1, and a gear device (wheel unit) that is an embodiment of the present invention meshes with the worm 13. This gear device includes a wheel 14, a rubber cushion 15, which is an operating member. and an engaging element 16. First, these structures will be explained.

The wheel 14 is shown enlarged in FIGS. 3a and 3b. The wheel 14 is roughly disc-shaped and has wheel teeth cut on its outer peripheral surface, but one plane is depressed, and this depression forms a ring-shaped tooth base 14a and a protrusion 1.
．． 4b1 and 14b2 are formed. Projection 14b1,
14b2 is on the same diameter and extends toward the rotational center axis, as clearly shown in FIG. protrudes in the direction. A hole 14c is formed in the center of the gear 14, through which the rotating shaft 17 passes.

Note that one rotation shaft 17 passes through this hole 14c, and the rotation shaft 17
and wheel 14 are not directly coupled.

The rubber cushion 15 is shown enlarged in FIGS. 4a and 4b. The rubber cushion 15 has four buffer parts 15.
a1 to 15a4 are formed, and between the buffer part 15a1 and the buffer part 15a2, there is a perfect part where the protrusion 14b1 fits perfectly, and also between the buffer part 15a3 and the buffer part 15.
A complete portion into which the protrusion 14b2 fits perfectly is formed between the buffer portions 15a1 and 15a4.
An incomplete notch into which the protrusion 16a1 of the engager 16 fits snugly is formed between the buffer portions 15a2 and 15a3, and an incomplete cutout into which the protrusion 16a2 of the engager 16 snugly fits between the buffer portions 15a2 and 15a3. 4 buffer parts 1.5 a 1-1
5a4 is integrally formed with a thin connecting portion 15b, and a hole 15 similar to the hole 14c is formed in this connecting portion 15b.
c is formed. In addition, the buffer portions 15a1 to 15a
4 are provided with through-holes 15d1 to 15d4 in order to soften the cushion of each buffer portion.

5a and 5b show the engager 16 on an enlarged scale.

The engaging element 16 is a buffer portion 15a1 of the rubber cushion 15.
The first portion 16a fits into the incomplete notch between and 15a4.
1 and a buffer portion] A second portion 113a2 that fits into the incomplete cutout between 5a2 and 15a3 and a center portion 16b are integrally formed, and the center portion 16b is connected to the tip of the one-rotation shaft 17. Rotation prevention hole], 6c is drilled.

Insert the rotary shaft 17 to which the output gear 18 (FIG. 2c) is connected into the gear housing 10, pass the tip of the rotary shaft through the hole 14c of the wheel 14, and connect the buffer portion 15a1 and the buffer portion 15a.
2, and the protrusion 14b2 between the buffer portions 15a3 and 15a4, and fit the rubber cushion 15 into the recess on the protrusion 14b, , 14b2 side of the wheel 14. Hole 1.6 c of Goko 16
Rotate 7- While passing the tip of the shaft 17, the buffer portion 15a1 and the buffer portion 1
5a4, the first portion 16a1, and the buffer portion 15a2.
positioning the second portion 16a2 between the and the buffer portion 15a3 and combining the engager 16 with the rubber cushion 15;
In the illustrated example, the tip of the rotating shaft is further passed through the hole in the rotor plate 19, and a washer and a washer are attached to the tip of the rotating shaft to assemble the gear device as shown in FIG. 2C.

A ring-shaped permanent magnet 2° is fixed to the rotor plate 19. This permanent magnet 20 is magnetized in such a manner that north poles and south poles are arranged alternately in the circumferential direction.

A Hall IC unit 12 is fixed to the gear housing 10 with the Hall IC 12a facing the outer peripheral surface of the permanent magnet 20.

When the motor 1 rotates, the worm 13 rotates, the wheel 14 rotates, and the buffer portion 15 of the rubber cushion 15 rotates.
The engager 16 and the rotating shaft 17 coupled thereto rotate via a1 to 15a4, and the output gear 18 rotates. The permanent magnet 20 rotates with the rotation of the rotating shaft 17, and the Hall IC
A unit 128- generates an electrical signal with a frequency proportional to the rotational speed.

As shown in FIG. 2c, the thickness of the gear device (14 to 16) (in the direction along the rotating shaft 17) can be made thinner, and the shock is absorbed by the rubber cushion 5, so there is less noise. High impact resistance.

In the above description, an embodiment of the present invention is applied to an electric mechanism for seat reclining. However, the gear device of the present invention is not limited to this. , opening and closing of roof panels, tilting of mirrors, and other applications where compactness is desired.

[Brief explanation of drawings]

Fig. 1a is a plan view of a conventional gear device, and Fig. 1b is a plan view of a conventional gear device.
The sectional view taken along line IB-IB in the figure, and FIG. 1c is a rear view. Fig. 2a is a plan view showing the external appearance of an electric drive source incorporating an embodiment of the present invention, Fig. 2b is a partially cutaway plan view thereof, and Fig. 2c is the ■c-nc of Fig. 2a. FIG. FIG. 3a is an enlarged plan view of the wheel 14, and FIG. 3b is a sectional view thereof taken along the line mB-IIrB. FIG. 4a is an enlarged plan view of the rubber cushion 15, and FIG. 4h is a sectional view thereof taken along the line IVB-IVB. FIG. 5a is an enlarged plan view of the engaging element 16, and FIG. 5b is a sectional view thereof taken along the line VB-VB. 1: Gear 2: Teeth 3: Fan-shaped notch 4: Ring-shaped spring 5 Nistay 6: Fan-shaped notch 7: Plate
8: Holder 9: Hole 10: Gear housing 11: Motor 12: Rotating pulse generator 13: Worm
14: Wheel (gear) 15: Rubber cushion (
Buffer member) 16: Engagement element 17: Rotating shaft 18: Output gear 19: Rotor plate-1-20=
Permanent magnet patent applicant Aisin Seiki Co., Ltd.

Claims (5)

[Claims] (1) A gear that has teeth formed on its outer peripheral surface and a protrusion that protrudes in the radial direction and the direction along the rotation center axis; a first large part that engages with the protrusion of the gear, and another a buffer member made of a solid elastic material such as rubber or synthetic resin, having a second major portion; an engager having a shape to engage with the second major portion of the buffer member; and a rotating shaft; placing the protrusion of the gear on the first major portion, coupling the engager to the second major portion of the buffer member to combine the three, and coupling the rotating shaft to one of the gear and the engager; The other gear is coaxial with the rotating shaft, but movable in the direction of rotation relative to the rotating shaft. (2) The gear device according to claim 1, wherein the cushioning member has a six in the solid portion between the first large portion and the second notch portion to soften the cushioning portion. (3) The gear device according to claim 1, wherein the gear has a plurality of protrusions, two of which are on the same diameter. (4) The gear device according to claim 3, wherein the second large portion of the buffer member has the same diameter and is located midway between the first large portion corresponding to the protrusion located on the opposite side. (5) The gear device according to claim 1, wherein the buffer member has a connecting portion that connects the solid portion between the first and second large portions.゛