JPS6224636Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vehicle shaft drive device mainly applied to two-wheeled motor vehicles.

The applicant of the present invention has previously developed a device of this type, for example, as shown in FIG. In a device connected to an input shaft c of a bevel gear mechanism, the propeller shaft a is provided with a damper case d extending around the outer periphery of the torque damper b and enclosing it in an oil-tight manner, and an internal space of the damper case d is provided. e
A method was proposed in which lubricating oil was sealed in the torque damper b to ensure reliable lubrication of the torque damper b (Utility Application No. 56-71161). If the torque damper b is engaged through the joint member g fitted into the oil seal f of The air is compressed and the internal pressure becomes high in the assembled state, and as the ambient temperature rises during operation, the internal space e
The internal pressure of the propeller shaft a increases excessively, resulting in the deformation of the damper case d and the axial movement of the damper case d together with the propeller shaft a.

The purpose of the present invention is to provide a device that eliminates the above-mentioned inconvenience by preventing the internal pressure from rising above a certain value. The propeller shaft is connected to the input shaft of a bevel gear mechanism connected to the drive shaft of the vehicle via a cam-type torque damper, and the propeller shaft is provided with a damper case that extends around the outer periphery of the torque damper and encapsulates it in an oil-tight manner. A passage is provided for opening the internal space of the damper case to the outside, and a check valve that opens when the internal pressure of the internal space increases is interposed in the passage.

Next, an explanation will be given of the embodiment shown in FIGS. 3 and 4 in which the present invention is applied to a two-wheeled motor vehicle.

In the drawings, reference numeral 1 denotes a motorcycle body having a front wheel 2 and a rear wheel 4 which is a driving wheel via a rear fork 3, and an engine 5 mounted in the middle part of the vehicle body 1.
The rear wheel 4 is connected to the rear wheel 4 via the propeller shaft 6 connected thereto.
The input shaft 8 of the bevel gear mechanism 7 is connected to the input shaft 8 of the bevel gear mechanism 7.

The propeller shaft 6 is disposed within a fork pipe 3a on one side of the rear fork 3, as shown clearly in FIG. A cam-type torque damper 10 consisting of a damper cam 10a and a lifter 10b is provided at the rear end, and the propeller shaft 6 and the input shaft 8 are connected to the damper 10 by a spline. Joint members 11 extending from the input shaft 8 side are connected to each other by spline engagement on the peripheral surface of the rear end portion of 10a, and furthermore, a joint member 11 extending to the outer periphery of the damper 10 is attached to the propeller shaft 6 to cover it in an oil-tight manner. A damper case 12 is provided for enclosing the damper.

To explain this in more detail, the damper case 12
is oil-tightly connected to the propeller shaft 6 at its front end, and is oil-tightly fitted to the circumferential surface of the joint member 11 at the oil seal 13 on the inner periphery of the opening at its rear end. The internal space 14 of the damper case 12, which is closed by the member 11, is filled with lubricating oil.

In the drawing, 15 is a seal guide installed in parallel with the oil seal 13, 16 is a gear case fixed to the fork pipe 3a that accommodates the bevel gear mechanism 7, and 1
7 indicates a breather hole of the gear case 16.

Although the above is not particularly different from the above-mentioned previous proposal, according to the present invention, a passage 18 that opens the internal space 14 of the damper case 12 to the outside is provided, and the passage 18 is provided with a passage 18 that opens the internal space 14 of the damper case 12 to the outside. A check valve 19 that opens when the internal pressure increases is interposed.

In the illustrated example, a shaft hole passing through the input shaft 8 in the axial direction is formed, and the front end of the shaft hole is connected to the internal space 14 through a gap between the spline engagement portion of the joint member 11 and the damper cam 10a. The rear end communicates with the inside of the gear case 16, and the shaft hole constitutes the passage 18, into which the check valve 19 is inserted, so that the passage structure can be made more compact.

In the drawing, reference numeral 19a indicates a spring that urges the check valve 19 toward the closing side, and reference numeral 19b indicates a spring holder for the spring 19a.

Next, to explain its operation, when the air in the internal space 14 of the damper case 12 is compressed when the joint member 11 is assembled, or when the air in the internal space 14 expands due to a rise in ambient temperature and the internal pressure increases, the The air in the space 14 passes through the passage 18 formed by the shaft hole of the input shaft 8, passes through the check valve 19 and the gear case 16, and is discharged to the outside from the breather hole 17, so that the internal pressure is reduced to the check valve 19. deformation of the damper case 12 and forward movement of the case 12 with the propeller shaft 6 due to the action of the internal pressure on the front end wall of the case 12 is suppressed to a constant pressure determined by the spring force of the damper case 12. Even if the fork pipe 3a is tapered as shown, the case 12 will not come into contact with it.

As described above, according to the present invention, a passage is provided that opens the internal space of the damper case to the outside, and a check valve is interposed in this passage, and the internal pressure of the space is maintained at a low pressure below the set value of the check valve. This has the effect of overcoming the above-mentioned disadvantages of the previous proposal due to an increase in internal pressure.

[Brief explanation of the drawing]

Fig. 1 is a cut-away plan view of the device according to the previous proposal, Fig. 2 is a cut-away plan view of the main part of the device in an assembled state, and Fig. 3 is a side view of a two-wheeled motor vehicle equipped with the proposed device.
FIG. 4 is a plan view taken along the line -- in FIG. 3. 4... Drive wheel (rear wheel), 5... Engine, 6...
...Propeller shaft, 7...Bevel gear mechanism, 8
... Input shaft, 10 ... Torque damper, 12 ... Damper case, 14 ... Internal space, 18 ... Passage,
19...Check valve.

Claims (1)

[Scope of utility model registration request] A propeller shaft connected to the engine is connected via a cam-type torque damper on the propeller shaft to an input shaft of a bevel gear mechanism connected to the drive shaft of the vehicle, and a propeller shaft is connected to the input shaft of a bevel gear mechanism connected to the drive shaft of the vehicle through a cam-type torque damper on the propeller shaft. A vehicle equipped with a damper case that oil-tightly encloses the damper case, a passage opening the internal space of the damper case to the outside, and a check valve that opens when the internal pressure of the internal space increases is interposed in the passage. Shaft drive device.