KR0148654B1 - Noise protecting device of automatic transmission - Google Patents

Abstract

The present invention relates to a noise reduction device for a transmission for a vehicle, and a fundamental object of the present invention is to prevent vibration in the circumference and the longitudinal direction at one side of a bearing of an input shaft, and the force to press the bearing out further acts on the rotational speed. Therefore, the pressure is generated at low speed, and at high speed, the pressing force is removed so that the rotation is not disturbed.

And a characteristic configuration for this is that in a normal transmission that the bearing is installed between the case and the input shaft to receive the rotational force of the engine, it is built with a key on one side of the bearing, and more than four directions on the side facing the bearing A disc having a plurality of inclined grooves, a built-in in the inclined groove of the disc, the back of which consists of an inclined surface, a pressure block mounted on the outer spring and the support spring of the center, and the tension of the pressure spring It is formed by the small screw inserted from the outside in order to control the pressure block is rotated to the outside by the centrifugal force to pressurize the bearings, when rotating at low speed, the pressure block is pushed toward the center along the slope when rotating at low speed.

Description

Noise reduction device for automotive transmission

1 is a side cross-sectional view showing a configuration of the present invention.

2 is a cross-sectional view taken along the line A-A of FIG.

3 is a side cross-sectional view showing a conventional configuration.

* Explanation of symbols for main parts of the drawings

1: Transmission case 2: Input shaft

3: bearing 4: disc

5: pressurized block 6: pressurized spring

7: support spring 8: small screw

11: end 41: inclined groove

42: key 51: slope

[Industrial use]

The present invention relates to a noise reduction device of a vehicle transmission, and more specifically, to prevent vibrations (End Play) in the circumference and the longitudinal direction of an input shaft that receives power from an engine. To get rid of it.

[Prior art]

In general, in the transmission of a vehicle, the input shaft receives the thrust from the crankshaft of the engine, and the input shaft generates vibrations in the circumference and the longitudinal direction due to the change of the minute rotational force on the engine side. The gears collide with each other to produce noise (rattle noise), which is more severe when the engine is rotating at lower speeds than when it is rotating at high speeds.

[Problems with Prior Art]

Up to now, the method as shown in FIG. 3 is used as a method of fixing the bearing (a).

That is, after bearing a is affixed between the input shaft b and the case c of the transmission, the support plate d which is in contact with the bearing a is fixed to the case c side of the transmission. On the other side, to prevent noise by inserting a snap ring (e) fitted to one end of the shaft of the input shaft (b) so that the tightly fitted bearing (a) between them does not shake.

However, in such a conventional configuration, the vibration of the bearing (a) varies depending on the thickness of the snap ring (e), so that the thickness of the snap ring (e) is difficult to precisely process and fit, and even if the precision is processed and fitted for a long time If it passes, there is a problem that is gradually loosened by the vibration and the noise occurs again.

In particular, the snap ring (e) as described above is an assembly method for interference fit, so that it is always in close contact with the same force irrespective of the size of the rotation. Therefore, it is useful to prevent noise when rotating at a low speed, but the engine when rotating at high speed To increase the resistance to the rotation is rather harmful.

[Problem to Solve Invention]

Therefore, the present invention has been devised to compensate for the above problems, and the basic object of the present invention is to accumulate at one side of the bearing of the input shaft to prevent vibrations in the circumference and the longitudinal direction, and the force to press the bearing out further rotates. Its purpose is to variably act on numbers so that pressing force is generated at low speed, and pressing force is removed at high speed so as not to interfere with rotation.

[Means for solving the problem]

And a characteristic configuration for this is that in a normal transmission that the bearing is installed between the case and the input shaft to receive the rotational force of the engine, it is built with a key on one side of the bearing, and more than four directions on the side facing the bearing A disc having a plurality of inclined grooves, a built-in in the inclined groove of the disc, the back of which consists of an inclined surface, a pressure block mounted on the outer spring and the support spring of the center, and the tension of the pressure spring It is formed by the small screw inserted from the outside in order to control the pressure block is rotated to the outside by the centrifugal force to pressurize the bearings, when rotating at low speed, the pressure block is pushed toward the center along the slope when rotating at low speed.

EXAMPLE

Hereinafter, the detailed configuration and effect of the present invention will be described with reference to the accompanying drawings.

1 is a side cross-sectional view of a main portion showing the configuration of the present invention, and FIG. 2 is a cross-sectional view taken along the line A-A of FIG.

As shown in the figure, a bearing 3 is arranged between the case 1 and the input shaft 2 of the transmission, so that the rotational force of the engine is transmitted to the input shaft 2, wherein the bearing 3 is It is prevented from being pushed to one side by the end 11 of the case 1, which is similar to the conventional general structure.

In the present invention, the disc 4 is provided on one side of the bearing 3, but is arranged as a key 42 on the opposite side of the end 11.

The side piece of the disc 4, that is, the side piece on which the bearing 3 is provided, forms a plurality of inclined grooves 41 radially to embed each press block 5.

2 is an embodiment in which the inclined grooves 41 are formed in six directions, and the rear side of the pressure block 5 embedded in each of the inclined grooves 41 corresponds to the inclined grooves 41. Therefore, the inclined surface 51 has a pressure spring 6 on the outside thereof, and a support spring 7 on the center thereof, respectively, but the elasticity of the pressure spring 6 should be greater.

On the outside of the pressure spring 6, small screws 8 for adjusting the tension of the pressure spring 6 are screwed one by one from the outer circumferential surface.

The following describes the operating state of the present invention configured as described above.

When the rotational force of the engine rotates at a high speed, the rotational force also increases as the input shaft 2 also increases, and the rotational force increases the centrifugal force on the pressure blocks 5.

When the centrifugal force is gradually increased in the pressure block 5, the force of the pressure spring 6 is overcome and moved away from the center of the shaft, which is in contact with the inclined surface 51 at the bottom of the inclined groove 41. You will retire so as not to touch (3).

Therefore, when the input shaft 2 is rotating at a high speed, the pressure block 5 is spaced apart by the bearing 3 so as not to interfere with the rotation. On the other hand, when the input shaft 2 rotates at a low speed, the pressure block is rotated at this time. Since the force of the pressure spring 6 is greater than the centrifugal force applied to (5), it is also moved toward the center along the inclined surface 51.

The pressurized blocks 5 moving toward the center serve as wedges between the bearing 3 and the disc 4 to thoroughly suppress the vibration in the longitudinal direction of the bearing 3, and thus suppress the vibration. Many of the gears built into these shafts do not shake to prevent noise.

[Effect]

According to the present invention as described in detail above, the pressure block 5 flows in accordance with the centrifugal force on the inclined groove 41 of the disc 4 which is arranged in close proximity to the side of the bearing 3. The bearing (3) can be pressed to hold.

Therefore, according to the present invention, when the high speed rotation does not give a resistance to the bearing, the noise is prevented by the low speed rotation that generates noise, in particular, it is very useful because there is no deformation or wear even if used for a long time.

Claims (1)

In a normal transmission in which a bearing 3 is built between the case 1 and the input shaft 2 and the rotational force of the engine is transmitted, the bearing 3 is built on one side of the bearing 3 as a key 42, and the bearing A disk (4) having a plurality of inclined grooves (41) in at least four directions on the side facing toward; It is built in each of the inclined grooves 41, the rear is composed of the inclined surface 51, the pressure block (5) installed in the pressure spring (6) of the outer side and the support spring (7) of the center and ; Small screws (8) screwed from the outside to adjust the tension of the pressure spring (6); When rotating at high speed, the plurality of press blocks 5 are pushed outward by the centrifugal force and do not press the bearing 3, and when the press blocks 5 are pushed toward the center along the inclined surface 51 when rotating at a low speed. Presses the bearing (3) to prevent noise in the longitudinal direction of the automobile transmission, characterized in that the noise prevention device.