JPH081334Y2 - Gear hitting sound generation prevention device for gear transmission - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for preventing the generation of gear rattle in a gear transmission such as a manual transmission of an automobile, and more particularly to a device for preventing rotational resistance by an elastic friction member. This is related to stabilization technology.

[0002]

2. Description of the Related Art Transmissions for automobiles include a gear that constantly rotates in conjunction with the crankshaft of an engine and a gear shaft that rotatably supports the gear. When the irregular vibration of the crankshaft of the engine is transmitted to the gears while the automobile is running, a peculiar noise is generated from the gears.

In order to prevent this noise, an elastic friction member is usually mounted between the gear and the gear shaft that rotatably supports the gear, and the elastic friction member is used between the gear and the gear shaft. The appropriate noise is generated to suppress the noise.

A conventional example of this elastic friction member is shown in FIG.
In the figure, 1 is a gear, 2 is a gear shaft, 3 is a sleeve that rotates integrally with the gear shaft 2, 4 is a needle roller bearing, and 5 is an elastic friction member.

As shown in the figure, the conventional elastic friction member 5
Has a shape similar to that of a general oil seal, and includes a mandrel ring 6 that is fitted to the sleeve 3 that is a member on the gear shaft 2 side, and rubber that is adhered to the outer circumference of the mandrel ring 6. And the elastic material 7. The elastic member 7 is the gear 1
It has a skirt-shaped lip 8 which is in sliding contact with the inner peripheral surface of the shaft hole over the entire circumference.

[0006]

Generally, in such an elastic friction member 5, the contact state between the lip 8 of the elastic friction member 5 and the inner peripheral surface of the shaft hole of the gear 1 is a surface contact, which is relatively smooth. Since the surfaces are in contact with each other, the lubricant tends to be scraped from the sliding contact surface, making it difficult to form a lubricant oil film, increasing rotational resistance, and causing abnormal heat generation. In particular, when it is used in a high-speed rotation range, there is a problem in durability, such as poor lubrication at an early stage, resulting in sticking of the lip and abnormal wear of the lip.

The present invention has been made in view of the above-mentioned problems, and it is possible to suppress the rotational resistance between the elastic friction member and its sliding contact partner and to maintain the state for a long period of time. To aim.

[0008]

SUMMARY OF THE INVENTION In order to achieve such an object, the present invention provides a meshing drive of a gear between a gear shaft and a gear that are rotated relative to each other on the side of the bearing. A meshing hitting sound generation preventing device for a gear transmission having an elastic friction member for preventing sound generation has the following configuration.

In the device for preventing the generation of a mesh hitting sound of the gear transmission according to the present invention, the elastic friction member is integrated with the core metal fitted to the non-rotating member of the gear shaft and the gear. Made of an elastic material that is provided and is in sliding contact with the other rotating member,
In addition, a plurality of minute protrusions are formed on the sliding contact surface of the elastic material, and a space between the minute protrusions is a lubricant holding space.

[0010]

The friction is generated by the elastic material slidingly contacting the inner peripheral surface of the rotary member. Since the elastic material comes into contact with the rotating side member via the minute protrusions, a portion of the elastic material without the minute protrusions is not in contact with the rotating side member, and a lubricant oil film is formed and held in this non-contact space. Become so. That is, the lubricant oil film is continuously formed for a long time without being scratched as in the conventional case.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail with reference to the embodiments shown in FIGS. In these figures, FIG.
The same reference numerals are given to those common to. That is, in the figure, 1 is a gear, 2 is a gear shaft, 3 is a sleeve which rotates integrally with the gear shaft 2, and 4 is a needle roller bearing.

The elastic friction member 10 is provided with a mandrel ring 11 fitted to the sleeve 3 as a non-rotating side member, and the shaft of the gear 1 as a rotating side member integrally provided on the outer periphery of the mandrel ring 11. The elastic member 12 is in sliding contact with the inner peripheral surface of the hole. The cored bar ring 11 is made of a material having a constant width and having a spring property, and an upper half section thereof is formed into a substantially L shape. The elastic material 12 is made of rubber or the like attached so as to cover the entire outer periphery of the cored bar ring 11 with a substantially constant thickness,
It has a skirt-shaped lip 13 extending obliquely outward in the radial direction. A plurality of minute projections 14 are provided on the entire outer peripheral slope of the lip 13, and semicircular notches 15 as lubricating oil passages are provided at four locations on the circumference of the lip 13.
Is provided. Each of the minute protrusions 14 has a height and a size set to about 5 to 20 μm, for example, and is transferred and formed from a molding die at the same time when the elastic friction member 10 is molded.

In the elastic friction member 10 having the above structure, the lip 13 is in sliding contact with the inner peripheral surface of the gear 1 when the elastic friction member 10 is interposed between the gear 1 and the gear shaft 2 of a gear transmission such as a transmission. This causes friction. By the way, the minute protrusions 14 provided on the lip 13 come into point contact with the inner peripheral surface of the gear 1, and the surface of the lip 13 without the minute protrusions 14 does not contact the inner peripheral surface of the gear. A lubricant oil film is formed and held in the contact space. That is, the lubricant oil film is continuously formed for a long time without being scratched as in the conventional case. Since the lubricant oil film can be interposed in the sliding contact portion as described above, the friction coefficient becomes substantially constant, the rotational resistance can be suppressed, and abnormal heat generation can be prevented.

Specifically, FIG. 6 shows the relationship between the rotation time and the rotation resistance, and FIG. 7 shows the relationship between the oil temperature and the rotation resistance. In addition, in FIG. 6, the number of rotations: 4500
rpm, oil type: gear oil, oil temperature: 100 ° C., initial setting, 50 hours, 100 hours, 200 hours, 3
After 00 hours and 500 hours, the master gear is rotated at a rotation speed of 15 rpm and an oil temperature of 70 ° C., and the rotation resistance is measured. In FIG. 7, rotation resistances at oil temperatures of 25 ° C., 40 ° C., 70 ° C., and 100 ° C. are measured under the same rotation conditions as in FIG.

As is apparent from the graphs of FIGS. 6 and 7, the rotation resistance is about 2. even when the rotation time exceeds 400 hours.
It was suppressed to 1 kgf · cm, and the lip sliding temperature, which was conventionally +30 to 40 ° C, was also kept low at + 15 ° C. Further, at each oil temperature, the variation in the rotational resistance can be suppressed to a lower level than in the conventional case.

Further, in the elastic friction member 10 of this embodiment,
Wear will occur on the small protrusions 14 of the lip 13. Normally, when abrasion occurs, the rotation resistance is significantly reduced, but in the case of the present invention, the minute projections 1 are caused by abrasion.
The contact area with respect to the other party of No. 4 is increased and the rotational resistance is slightly increased, and the torque fluctuation with time is small.

Another embodiment of the present invention is shown in FIGS.
In this embodiment, the elastic friction member 10 has a mandrel ring 11 fitted on the inner peripheral surface of the shaft hole of the gear 1 as a non-rotating member.
The elastic material 12 integrally provided on the outer periphery of the sleeve is in sliding contact with the outer peripheral surface of the sleeve 3 as the rotation side member.

[0018]

As described above, according to the present invention, since the lubricant oil film can be continuously formed on the sliding contact portion for a long period of time, the increase of the friction coefficient can be suppressed and the rotation characteristics can be stabilized. , No longer affected by abnormal heat generation.

Therefore, it is possible to provide an excellent elastic friction member that exerts the original function of giving friction, but does not have an adverse effect due to friction.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of an embodiment of the device of the present invention in use.

FIG. 2 is a front view of the elastic friction member of FIG.

FIG. 3 is a sectional view taken along line (3)-(3) of FIG.

4 is another embodiment of the elastic friction member of the present invention, corresponding to FIG.

5 is a sectional view taken along line (5)-(5) of FIG.

6 is a graph showing the relationship between rotation time and rotation resistance in the device of FIG.

7 is a graph showing the relationship between oil temperature and rotation resistance in the device of FIG.

FIG. 8 is a vertical sectional view of a conventional device in use.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Gear 2 Gear shaft 3 Sleeve 10 Elastic friction member 11 Core metal ring 12 Elastic material 13 Lip 14 Small protrusion

Claims (1)

[Scope of utility model registration request] 1. A meshing striking sound of a gear transmission in which an elastic friction member for preventing meshing striking sound of the gear is provided on a side of the bearing between a gear shaft and a gear which are relatively rotated through the bearing. In the generation preventing device, the elastic friction member includes a cored bar fitted to a non-rotating side member of a gear shaft and a gear, and an elastic material integrally provided with the cored bar and slidingly contacting the other rotating side member. And a plurality of minute protrusions are formed on the sliding contact surface of the elastic material, and a lubricant holding space is provided between the minute protrusions.
A gear hitting sound generation preventing device for a gear transmission, comprising: