JPH0131808Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Object of the Invention and Field of Application] The present invention is based on a shift lever whose lower end is connected to a forkshaft portion of a transmission, and a spherical support portion of the shift lever that is connected to the fork shaft portion of a transmission through a vibration-isolating sheet member. It has a housing that is pivotally supported by the shift lever and has a built-in forkshaft part, a boot that is fixed to the shift lever at one end and fixed to the housing at the other end, and a groove formed in the spherical support part of the shift lever, and a groove between the housing and the boot. The present invention also relates to an improvement in a breather mechanism for a transmission that communicates the inside and outside of a housing through a passage formed in a boot, and is used in an automobile transmission.

[Prior art]

A conventional technique related to the present invention is shown in FIG. 1. This fork consists of a fork 11 for selectively and appropriately engaging a gear train 10 of a transmission, a fork shaft 13 that can reciprocate within a housing 12, and a shift head 14 fixed to the fork shaft 13. A shaft portion, a shift lever 16 whose lower end 15 is connected to the head 14, and a boot 1 whose one end is fixed to the shift lever 16 and the other end is fixed to the housing 12.
7, and seat members 18 and 19 are used to release air pressure when air in the transmission expands due to temperature rise, etc.
A groove 2 formed in a spherical support portion 20 of the shift lever 16 which is pivotally supported with respect to the housing 12 via
1. A passage 22 formed between the housing 12 and the boot 17 or a small hole formed in the boot 17 is utilized.

[Problems with conventional technology]

This conventional technique has the following problems.
That is, due to the rotation of the gear train 10 in the transmission,
The lubricating oil is scattered inside the housing 12, and the groove 21 formed in the spherical support part 20 of the shift lever 16, the passage 22 formed between the housing 12 and the boot 17, or the small hole formed in the boot 17. There is a risk that lubricating oil may leak to the outside of the housing 12 through the housing. Furthermore, if the scattered lubricating oil adheres to the vicinity of the spherical support portion 20 and the air pressure inside the transmission increases due to engine heat or the like in this state, the attached lubricating oil will infiltrate into the boot 17 side through the groove 21. do. If this infiltration occurs in large quantities and frequently, there is a risk that the lubricating oil will leak out of the housing 12 through the passage 22 or the small hole formed in the boot 17.

[Technical issues]

Therefore, the technical problem of the present invention is to ensure that air can escape from the inside of the housing to the outside and to prevent oil leakage.

[Technical means and their effects]

The technical measures taken to solve the above technical problem include a groove formed in the spherical support part of the shift lever that is pivotally supported to the housing via the seat member, and a groove formed between the housing and the boot or in the boot. In a breather mechanism for a transmission that communicates the inside and outside of a housing with a passage formed in the housing, a shielding part integrally formed with a seat member to cover a groove formed in a spherical support part connects with the spherical support part of a shift lever. It has a tip between the lower ends that comes into contact with the shift lever, and a groove that communicates between the inside and the outside. Therefore, air can be reliably evacuated from the inside of the housing to the outside, and the shielding part prevents lubricating oil from scattering into the groove formed in the spherical support part, thereby preventing oil leakage to the outside of the housing. .

〔effect〕

As described above, the present invention can prevent lubricating oil from scattering or entering into the groove formed in the spherical support part of the shift lever, between the housing and the boot, or into the passage formed in the boot. This has the effect of preventing lubricant from leaking to the outside of the housing, and since the shielding part that prevents lubricant from scattering is formed integrally with the sheet member, no special structure is required to prevent scattering. There is an effect.

〔Example〕

An embodiment of the present invention will be described below with reference to the accompanying drawings.

In Fig. 2, a vibration-proof resin bushing 2 is attached to the shift head 14 fixed to the forkshaft.
3, the shift lever 16 has a spherical lower end 15 connected to the inner surface of the housing 12, with its spherical support portion 20 being formed on the inner periphery of the housing 12 via a vibration-proofing resin sheet 18 and a rubber sheet 19. Projection 24
is supported by The upper surface of this spherical support part 20 is formed into a concave shape to receive the other end of a spring 26 whose one end is locked to a retainer 25, and the spherical support part 20 is brought into contact with the seat 18 by the spring 26. energized. This retainer 25 is fixed via the housing 12 and is placed in a predetermined position by a pin (not shown) extending into the groove 21. A boot 17 whose one end is fixed to the shift lever 16 and whose other end is fixed to the outer periphery of the housing 12
A passage 22 is formed between the housing 12 and the housing 12 . Note that instead of the passage 22, a small hole 22a may be formed in the boot 17.

A shielding portion 27 formed integrally with the sheet 19 is disposed on the sheet 19 to cover the groove 21 formed in the spherical support portion 20, and a tip 28 of the shielding portion 27 is connected to the spherical support portion 20. between the lower end 15 and in contact with the shift lever 16;
A groove 29 is formed that communicates the inside and outside. Therefore, the lubricating oil scattered by the rotation of the gear train in the transmission is protected from the spherical support part 2 by the shielding part 27.
Intrusion into the groove 21 side formed at 0 is prevented. Since the shielding part 27 is disposed so as to extend downwardly through the inside of the inward protruding part 24, the scattered oil can drip downward. Note that since the groove 29 is formed at the lower tip 28 of the inclined shielding part 27, even if splashed oil is transmitted to the spherical support part 20 side via the groove 29, it will not be transmitted to the gear train side via the groove 29. This makes it easier for the scattered oil to return to the ring.

Although both sheets 18 and 19 are fixed with adhesive or the like, they may be made of resin or rubber and may be integrally constructed.

[Brief explanation of the drawing]

FIG. 1 is a diagram explaining the prior art related to the present invention;
FIG. 2 is a sectional view showing an embodiment of the present invention. 16...Shift lever, 15...Lower end of shift lever, 17...Boot, 18, 19...Seat member, 20...Spherical support portion of shift lever, 21
... groove, 22 ... passage, 27 ... shielding part.

Claims (1)

[Scope of utility model registration request] A shift lever whose lower end is connected to a forkshaft portion of a transmission, a housing that pivotally supports the spherical support portion of the shift lever via a vibration-proof sheet member and houses the forkshaft portion, one end of which is fixed to the shift lever. A transmission that has a boot whose other end is fixed to the housing, and communicates the inside and outside of the housing by a groove formed in the spherical support part of the shift lever and a passage formed between the housing and the boot or in the boot. In the breather mechanism, a shielding part integrally formed with the sheet member to cover a groove formed in the spherical support part,
A breather device for a transmission, which has a tip between the spherical support portion and a lower end that comes into contact with the shift lever, and a groove that communicates inside and outside.