JPS6035819Y2 - power transmission device - Google Patents

Description

[Detailed description of the invention] The present invention relates to a power transmission device in a motorcycle or the like that transmits power from the countershaft of the transmission connected to the engine to the output shaft connected to the rear wheel. (with the power take-off case installed), the intermediate power take-off unit and the final power take-off unit can be incorporated into the take-out case, and the installation state of the power take-off unit can be optimally adjusted from the outside, so that the power transmission device can be installed. This simplifies and streamlines the installation work, and also ensures accurate installation and power transmission without loss.

Hereinafter, referring to FIGS. 1 to 3, one embodiment of the present invention will be described in which the present invention is applied to a shaft drive transmission system of a motorcycle. A main shaft 2 connected to the engine crankshaft and a countershaft 3 are rotatably mounted parallel to each other,
These are interlocked via a conventionally known speed change gear mechanism 4, and the rotation of the main shaft 2 can be transmitted to the countershaft 3 at a predetermined speed change ratio by the speed change operation of the mechanism 4.

A power outlet 5 is opened in the end wall of the mission case 1, and one end of the countershaft 3 projects outside the mission case 1 through the power outlet 5.

A power extraction case 6 is fixed to the end wall of the mission case 1 with a plurality of mounting bolts 7 so as to cover the power extraction port 5, and a cylindrical bearing portion 8 formed integrally with the case 6 is , is fitted into the power take-off port 5 via an O-ring 9, and a ball bearing 10 for rotatably supporting the counter shaft 3 and a power take-off shaft 13, which will be described later, is fitted into the bearing portion 8. are combined.

The power extraction case 6 includes an intermediate power extraction unit U1.
and the final power take-off unit U2 are configured to be individually removable and removable.

Next, the structure of the intermediate power take-off unit U1 will be explained. This includes a first case cover 12 that is attached to a first opening 11 opened in one end wall of the power take-off case 6.
The power take-off shaft 13 is rotatably supported by the first case cover 12, and the drive bevel gear 14 is fixed to the power take-off shaft 13.The structure thereof will be explained in detail as follows. The first case cover 12 has a plurality of fixing bolts 15 in the first opening 11 of the power extraction case 6.
A first adjustment shim S1 is interposed between the joint surfaces of the first opening 11 and the first case cover 12 which are removably fixed to each other and are opposed to each other in the installation direction.

A ball bearing 17 is fitted into a bearing hole 16 formed on the inner surface of the first case cover 12, and this ball bearing 17 is axially supported by a restraining plate 18 fixed to the inner surface of the first case cover 12 with fixing bolts 21. Supported to prevent movement.

The outer end of the power take-off shaft 13 is rotatably supported by the ball bearing 17, and the drive bevel gear 14 is fixed to the power take-off shaft 13 adjacent to the ball bearing 17.

The power take-off shaft 13 is formed hollow, and a female spline 19 is formed on the inner peripheral surface of its inner end, and this female spline 19 is inserted into and removed from a male spline 20 formed at the outer end of the counter shaft 3. The outer peripheral surface of the inner end of the power take-off shaft 13 is removably fitted into a ball bearing 10 provided in the bearing portion 8 of the power take-off case 6, and the countershaft 3 and the power take-off shaft are 13 and rotated together.

Next, the configuration of the final power take-off unit U2 will be explained. This is a second opening 22 that is removably fitted into a second opening 22 opened in the other end wall of the power take-off case 6.
It includes a case cover 23, an output shaft 24 rotatably supported by the second case cover 23, and a driven bevel gear 25 integrally formed at the inner end of the output shaft 24.
To further explain the structure in detail, the second case cover 23 has a hollow cylindrical bearing part 26 and a flange-like mounting part 27, and the bearing part 26 is connected to the second case cover 23 through an 01J ring 28. It is fitted into the opening 22 in a removable manner, and the flange-shaped mounting portion 27 is removably fixed to the other end wall of the power extraction case 6 by a plurality of fixing bolts 29 (FIG. 3).

A second adjustment shim S2 is interposed between the opposing joint surfaces of the second opening 22 and the flange-like attachment portion 27 in the installation direction, thereby adjusting the attachment position of the final power take-off unit U2. can do.

The output shaft 24 passes through the second case cover 23 and is supported therein via a tapered roller bearing 30 so as to be rotatable and immovable in the axial direction.

A driven bevel gear 25 integrally formed on the inner end of the output shaft 24 is meshed with the drive bevel gear 14 inside the power take-off case 6, and is connected to the open end of the second case cover 23 and the output shaft 24.
The gap between them is sealed by an oil seal 31.

An output gear 32 is fixed to the outer end of the output shaft 24, and the output gear 32 is interlocked with a rear wheel via an interlocking mechanism (not shown).

Next, the operation of one embodiment of the present invention will be described. When the engine is now driven, the main shaft 2 is rotationally driven, and this rotation is transmitted to the countershaft 3 via the speed change gear mechanism 4.

The rotation of the counter shaft 3 is transmitted to the power take-off shaft 13 and drive bevel gear 14 of the intermediate power take-off unit U1, which are spline-fitted thereto, and the driven bevel gear 25 of the final power take-off unit U2, which is further meshed with these. The output shaft 24 can be driven to rotate.

An intermediate power take-off unit U□ including a first case cover 12, a power take-off shaft 13, and a drive bevel gear 14;
The final power take-off unit U2, which includes the second case cover 23, the output shaft 24, and the driven bevel gear 25, can be assembled into or removed from the power take-off case 6 (while the power take-off case 6 is attached to the transmission case 1). That is, when the intermediate power take-off unit U1 is inserted into the power take-off case 6 through the first opening 11 and the final power take-off unit U2 is inserted into the power take-off case 6 through the second opening 22, the power is automatically released. The end of the take-out shaft 13 is spline-fitted to the countershaft 3 and can be fitted and supported by the ball bearing 10, and the driving bevel gear 14 and the driven bevel gear 25 can be meshed with each other. If the cover 12 and the second case cover 23 are fixed by the fixing poles 15 and 29, respectively, the intermediate and final power take-off units U1. U2 can be assembled to the power extraction case 6.

Furthermore, by removing the fixing bolts 15, 29, the intermediate and final power take-off units U□, U2 can be pulled out in the axial direction of the power take-off shaft 13 and the output shaft 24, respectively.

Also, before attaching the power take-off case 6 to the transmission case 1, the intermediate power take-off unit U1 and the final power take-off unit U2 are assembled in the power take-off case 6, and then the power take-off shaft is attached to the outer end of the countershaft 3. 1
3 may be spline-fitted, and the power take-off case 6 may be fixed to the transmission case 1 with the mounting bolts 7. In this case, the assembled state of the intermediate power take-off unit U and the final power take-off unit U2 may be fixed to the power take-off case 6. can best be adjusted externally.

FIG. 4 shows a second embodiment of the invention.

In this embodiment, an oil seal 33 is fitted between the bearing part 8 of the power take-off case 6 and the power take-off shaft 13, and this oil seal 33 makes the inside of the transmission case 1 and the inside of the power take-off case 6 oil-tight. This allows the transmission case 1 and the power extraction case 6 to be separated and use different lubricating oils.

As described above, according to the present invention, there is an intermediate power take-off unit that includes a first case cover, a power take-off shaft, and a drive gear, and a final power take-off unit that includes a second case cover, an output shaft, and a driven bevel gear. Each unit is configured as a unit, and these units can be inserted into the first and second openings of the power take-off case (while attached to the transmission case), and the units can be automatically assembled into the power take-off case. Therefore, the installation work becomes extremely simple and the work efficiency can be significantly improved.

Further, a first adjustment shim is interposed between the first case cover of the intermediate power take-off unit and the first opening of the power take-off case, which face each other in the assembly direction, and a first adjustment shim is interposed between the first case cover of the intermediate power take-off unit and the first opening of the power take-off case. Since the second adjustment shim is interposed between the facing joint surfaces of the cover and the second opening of the power take-off case in the installation direction, the back of the drive gear of the intermediate power take-off unit and the driven gear of the final power take-off unit is The lash can be freely adjusted from the outside, and the assembled state of both units can be easily adjusted to the best state for smooth and lossless power transmission.

As in the first and second embodiments, by arranging the driven gear of the final power extraction unit closer to the transmission case than the drive gear of the intermediate power extraction unit, the output shaft connected to the driven gear can be It can be moved closer to the longitudinal centerline, making it possible to make the entire power transmission device more compact and also useful for improving the performance of the motorcycle.

[Brief explanation of the drawing]

1 to 3 show a first embodiment of the device of the present invention, FIG. 1 is a cross-sectional plan view thereof, FIG. 2 is a view taken in the Z direction of FIG. 1, and FIG. 3 is a view taken in the Y direction of FIG. 1. The perspective view, FIG. 4, is a partially sectional plan view of a second embodiment of the device of the present invention. SL...First adjustment shim, S2...Second
Adjustment shim, Ul...Intermediate power take-off unit, U
2... Final power extraction unit, 1... Curved transmission case, 3... Curved counter shaft, 5...
・Power extraction port, 6...Power extraction case, 11.
...First opening, 12...First case cover, 13...Power take-off shaft, 14...
Drive bevel gear as a drive gear, 22, curved, second opening,
23...Second case cover, 24. Bent/output shaft, 25...Driven bevel gear as a driven gear.

Claims (1)

[Scope of Claim for Utility Model Registration] ■ A transmission case housing a transmission; a power take-off case fixed to one end wall of the mission case so as to cover a power take-off port opened in the wall; and a power take-off case; an intermediate power take-off unit that is removably incorporated into the power take-off case; and a final power take-off unit that is removably incorporated into the power take-off case and is interlocked with the intermediate power take-off unit; a first case cover that is removably fixed to a first opening opened in one end wall of the power extraction case; The final power take-off unit includes a power take-off shaft that is removably connected to the power take-off shaft and a drive gear that rotates integrally with the shaft, and the final power take-off unit has a second opening opened in the other end wall of the power take-off case. a second case cover that is removably inserted into the second case cover, an output shaft that is rotatably supported by the second case cover, and a driven gear that rotates integrally with the shaft;
A power transmission device in which this driven gear meshes with the driving gear. (2) In the power transmission device according to claim (2) of the utility model registration, a second A first adjustment shim and a second adjustment shim are respectively interposed between the facing joint surfaces of the second case cover of the final power extraction unit and the second opening of the power extraction case, and the drive gear and the driven gear mesh with each other. A power transmission device that allows the backlash between gears to be adjusted.