JPS6029387A - Power transmission gear in car such as shaft drive type motorcycle - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] The present invention applies to a shaft-driven motorcycle, for example.
This invention relates to an instant J-force transmission device that transmits the engine power to the rear wheels.

In the bolt-shaft driven motorcycle, the engine power is transmitted to the rear wheel through the drive shaft inserted into the rear arm. The first driving shaft and the output shaft that outputs the engine power are connected via a universal joint in order to transmit the engine power to the rear wheels without any problem even when the rear arm swings. Conventionally, a so-called hook-type joint in which the input side yoke and the output 91jl yoke are connected by a cross shaft is often used as this universal joint, but due to the structure of this joint, when the intersection angle between the output shaft and the drive shaft becomes large, The angular velocity of the drive shaft changes many times during one revolution of the output shaft, causing problems such as uneven rotation of the rear wheels. As a countermeasure for this, drive l1
It would be nice if joints were provided at both ends of l111 to offset the angular velocity.

If this is done, not only will there be a problem in terms of space, but the number of parts will increase, resulting in a cost inconvenience.

The present invention was made based on these circumstances, and
Power in shaft-driven two-wheeled motorcycles and other vehicles that can transmit engine power evenly and smoothly to the rear wheels, have a simple structure, and reduce costs because the number of joints is i+6.1. The purpose is to provide a transmission device.

In other words, in order to achieve the above purpose, the non-invention
and a drive shaft, the intersecting direction and intersecting angle of these coaxes can be changed arbitrarily, and the one rotation part 11 of the output shaft is assembled via a plurality of balls arranged at intervals in the rotational direction. F) It is characterized by being connected by a constant velocity joint that transmits to the + axis.

The following is an example of "misfire", which was simply applied to a motorcycle.
Todoroki brother Akira based on the mask.

In the a31 diagram, 1 is the vehicle body, 2 is the front fork, 3 is the front wheel, 4 is the seat, 5 & 4 machining, and 6 is the rear wheel. In the rear part of the crankcase 7 of the engine 5, there is housed a transmission shaft 8 which is driven by an NlH force transmission system from a crankshaft (not shown).
An output shaft 9 is supported perpendicularly to. The output shaft 9 is rotationally driven by another bevel gear 11 that meshes with the bevel gear 10 provided at -9116 of the speed change shaft 8, and the rear end of this output shaft 9 passes through an end plate 12. It is led out to the rear of the crankcase 7.

At the rear of the vehicle body l, left and right rear arms JJ (only one is shown) extending rearward are pivotally supported via a pivot shaft 14, and the pivoting portion of this rear arm 13 is connected to the transmission shaft 8. It is located at the rear. The rear arm 13 has a hollow cylindrical shape, and its front end opening is a rubber boot 15.
The gear case 16 is connected to the end l#, 12 via the rear end opening.

A drive shaft 17 is inserted through the rear arm 13. The front end of this drive shaft 17 is connected to the rear end of the output shaft 9 via a constant velocity joint 18, so that even when the rear arm 13 swings, power is transmitted from the output shaft 9 to the drive shaft 17. is now being carried out. The rear end of the drive shaft 17 is coaxially connected to a transmission shaft 20 supported within the gear case 16 via a coupling gear 19, and a pinion gear 21 is formed at the rear end of the transmission shaft 20. There is. Further, an axle 22 of the rear wheel 6 is installed in the gear case 16 so as to be perpendicular to the drive shaft 17 .

The outer periphery of the collar 23 inserted into this drive shaft 17 has ff1
The boss portion 24 connected to the hub of l116 is fitted with tin 2i/. This boss portion 24 is rotatably supported within the gear case 16, and is rotationally driven by a ring gear 25 that meshes with the pinion gear 21. As a result, the rotation of the drive shaft 17 is caused by the transmission shaft 20. 21% of the pinion cap is transmitted to the knob of the rear AI6 via the ring cap 25 and boss portion 24.

On the other hand, a buffer mechanism 26 for overload prevention is provided on the outer periphery of the front end of the driving J-axis I7. That is, drive shaft 1
A cylindrical movable member 27 is attached to the outer peripheral portion of the front end of the member 7 in a straight spline engagement manner so as to be movable in the axial direction. A torsion spline 28 is carved on the outer circumferential portion of the movable member 27, and the inner circumferential surface of an outer cylinder 29 having a nine-complex cylinder shape is secured onto this torsion spline 28. Therefore, due to sudden engine braking, the drive shaft 17ill
When an excessive reverse load 6s is applied from i, the movable member 27 moves backward on the drive shaft 17 due to the force of the torsion spline 28 against the biasing force of the spring 30, and at this time the movable member 27 moves backward on the drive shaft 17. Since the outer cylinder 29 idles, the power transmission to the outer cylinder 29 is absorbed and relaxed.

Therefore, the details of the constant velocity joint 18 are explained in the fourth section.
To explain with reference to the drawings and FIG.
A rod-shaped ball holder 33 is press-fitted coaxially.The end 61j of the ball holder 33 has a spherical shape.
A plurality of fitting grooves 36 extending in the axial direction of the ball holder 33 are formed on the outer peripheral surface of the spherical portion 34 . These fitting grooves 35 are formed at equal intervals in the circumferential direction,
The bottom surface of the groove is formed in an arc shape. A ball 36 is rotatably housed in the J4 fitting t# 35, and these balls 36 are connected to the spherical portion 34.
11 and is held by a retainer 37. The retainer 37 has a substantially conical shape, and the inner surface on the rear end side of the hollow portion 38 is formed with four sides forming a part of a sphere, and is in close contact with the spherical portion 34 . Also, t4tl of the hollow part '38
A beam/gang-shaped cap 39 is press-fitted into the QNa opening, and an M contact piece 4o that contacts the spherical portion 34 is formed on the inner circumference of the cap 39. Therefore, the retainer 37 is inserted into the hollow portion of the cap 39. It is fixed to the outside of the spherical part 34 by inserting the spherical part 34 between the inner surface of the cap 38 and the cap 39 from the front. The retainer 37 is provided with through holes 41 at equal intervals in the circumferential direction on the outer periphery of the retainer 37, through which the balls 36 pass.
The pivot ball 36 is prevented from moving in the direction of the low matching groove 35.

On the other hand, a hollow cylindrical coupling 42 is spline engaged with the rear end of the output shaft 9, and a nut 43 is connected to the rear end of the output shaft 9.
The tightening is fixed by This coupling 4
Inside the rear end opening of 2.

The spherical portion 34 and the retainer 317 are introduced into the spherical portion 34 , and the top end of the spherical portion 34 is slidably abutted on the rear end surface of the output shaft 9 . k f of coupling 42
On the inner surface of the 4M opening, a number of concave grooves 44 are formed in the axial direction.These concave grooves 44 are formed at equal intervals in the circumferential direction of the coupling 420. It is opposed to the low matching groove 35 of the portion 34.

The bottom surface of the groove is formed in an arc shape. A part of the ball 36 is rotatably accommodated in this groove 44, so that the ball 36 is slidably and closely attached to the groove bottom curve of the low matching groove 35 and the groove bottom surface of the groove 1fjf44. The ball 36 is held between both casting bottom surfaces. Reference numeral 46 designates a rubber boot that prevents foreign matter from entering the sliding portion of the ball 36.

According to the constant velocity joint 18 having such a configuration, the drive shaft 171! The ball 36 held by Il is connected to the output shaft 911
1! Since it is rotatably fitted into the concave groove 44 of the coupling 42, the intersecting direction and intersecting angle of the two shafts 9 and 17 can be changed arbitrarily. In this case, due to the swinging of the fc clear arm 13 as shown in FIG. is concave groove 4
4 (because it is displaced by 1 in one direction, the above intersection angle α
In any case, the plane X passing through the center of each ball 36 is at an angle θ8 between the two axes 9 and 17. It is located at a position that bisects θ2, so both III9. It is possible to ensure uniform velocity of l゛7.

Therefore, the engine power can be smoothly transmitted to the rear wheels 6 without causing uneven rotation of the rear wheels 60 as in the conventional case. In addition, when maintaining a constant velocity pheasant, there is no need to provide joints at both ends of the drive shaft 17 as in the conventional case, which reduces the number of parts, simplifies the structure of the power transmission system, and reduces costs. In addition, in this embodiment, the J watercolor portion 34 at the end of the ball holder 33 i1J is brought into contact with the output shaft 9 freely, so that the connecting portion between the output shaft 9 and the drive shaft 17 is reduced. In addition to preventing rattling, even if the intersection angle α of these two axes 9.17 becomes large,
The abutment portion allows the center of rotation between the shafts 9 and 17 to be maintained at a fixed distance, which has the advantage of allowing smoother power transmission.

Note that the present invention is not limited to the embodiments described above. For example, the tip of the spherical portion does not necessarily have the property of coming into contact with the output shaft, and the vehicle is not limited to a motorcycle, but can be similarly implemented even if it is a tricycle.

According to the present invention described in detail above, the output shaft of the engine power and the drive shaft for driving the rear wheels are connected by a constant velocity joint. The power can be transmitted smoothly to the rear wheels.Furthermore, there is no need to increase the number of joints to ensure constant velocity, so the number of parts a can be reduced, simplifying the structure of the power transmission system and reducing costs. There are some points to help reduce this.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a 9111 side view of the two-wheeled vehicle, FIGS. 2 and 3 are top views of the power transmission system, and FIG. 5 is a side view taken along the line IV-IV, and FIG. 5 is an explanatory diagram of the operation. l...Vehicle body%5...Engine, 6...Rear wheel%9.
...output il! 1Ii-13...Rear arm, 17.
... Drive shaft, 18... Constant velocity joint, 36...
ball.

Claims (1)

[Claims] The rear arm that supports the rear wheel and extends rearward swings against the vehicle body.
In a vehicle such as a shaft-driven motorcycle, which is pivotally connected to the rear arm and has a drive shaft connected to the output shaft that outputs engine force inserted through the rear arm, and this drive shaft drives the rear axle. , the output shaft and the drive shaft can be freely changed in their direction of difference and crossing angle.
Power transmission in a vehicle such as a shaft-driven motorcycle, characterized in that the rotational drive of the output shaft is connected by a constant velocity joint that transmits the rotational drive to the drive shaft via a plurality of balls arranged at intervals in the rotation direction. Device.