JPS6359916B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The invention of this application relates to the structure of a rear arm in a vehicle having two rear wheels, such as a shift drive tricycle.

In conventional tricycles with rear wheels, for example, a rear arm consisting of a pair of left and right arm members is swingably connected to the vehicle body via a pivot shaft, and a rear arm is connected between the rear ends of these arm members at both ends. There is one in which a rear axle to which a rear wheel is attached is pivotally supported, and a transmission shaft for transmitting the output of the engine to the rear axle is inserted into one of the arm members.

In this type of vehicle, when connecting the rear arm to the vehicle body, the rear arm must be supported while the pivot portion is fastened, but the large size of the rear arm makes the fastening work very difficult. In other words, in a type in which rear wheels are attached to both ends of the rear wheel, a large moment acts on the rear axle, so it is advantageous to widen the distance between the left and right arm members. Since the rear arm is large in size and the transmission shaft is inserted into one arm member of the rear arm, the rear arm becomes heavy, and these factors impair workability during assembly.

This invention was made in view of the above circumstances, and an object of the invention is to construct a large and heavy rear arm so that its arm members, power transmission shaft, etc. can be separated in the front and back direction, thereby making it possible to attach the rear arm to the vehicle body. To provide a shaft drive type vehicle equipped with a rear wheel that makes it easy to carry out.

The structure of the present invention is such that the front end of a rear arm consisting of a pair of left and right arm members is swingably connected to the vehicle body by a pivot shaft, and the rear axle is pivotally supported between the rear ends of these left and right arm members. In a vehicle in which a rear wheel is attached to each end of the rear wheel, and a transmission shaft that transmits engine power to the rear wheel is inserted into one of the arm members, the arm member into which the transmission shaft is inserted is the front arm and the rear arm. The front arm and the rear arm are configured to be removably connected to each other, and the transmission shaft is formed of a front shaft portion and a rear shaft portion, and the front shaft portion and the rear shaft portion are connected to each other. The rear end portion of the rear arm of the arm member into which the transmission shaft is inserted is removably connected to a rear axle support member surrounding a rear axle;
A shaft drive vehicle includes two rear wheels in which the other arm member into which the transmission shaft is not inserted and the rear axle support member are removably connected.

An embodiment in which the present invention is applied to a tricycle will be described with reference to FIGS. 1 to 4.

The vehicle body 1 shown in the figure is constructed by welding a main pipe 3 and a pair of left and right down tubes 4, 4 to the rear surface of a steering head pipe 2, and a pair of left and right down tubes 5, 4 in the middle of the main pipe 3. 5 are arranged. The rear portions of the down tubes 4, 4 and the lower ends of the seat pillar tubes 5, 5 are connected to each other via brackets 6, 6.

A front fork 7 is pivotally supported on a steering head pipe 2, a steering handle 8 is connected to the upper end of the front fork 7, and a front wheel 9 having a balloon tire is attached to the lower end.

Seat rails 10, 10 are provided in the middle of the seat pillar tubes 5, 5 to extend rearward, and backstays 11, 11 are provided between the middle of the seat rails 10, 10 and the brackets 6, 6.
has been erected. A seat 12 is placed on the seat rails 10, 10.

An engine 13 is mounted in a space surrounded by the main pipe 3, down tubes 4, 4, and seat pillar tubes 5, 5. An exhaust pipe 14 is led out from the front of the engine 13, and this exhaust pipe 14 is connected to a muffler 15.

A rear arm 17 is swingably connected to the brackets 6, 6 via pivot shafts 16, 16. The rear arm 17 is shown in FIG. That is, 18 and 19 are a left arm and a right arm corresponding to arm members, and these left and right arms 18 and 19 are front arms 18a and 19, respectively.
a and rear arms 18b, 19b, and the front arms 18, 19a and the rear arms 18b, 19b are connected to the stud bolts 20... …
... are removably connected in the front and rear direction. The front ends of the left and right front arms 18a, 19a are integrally connected by a cross member 22. Therefore, the left and right front arms 18a, 19a and the close member 22 form a U-shaped front unit 23.
It consists of

The cross member 22 is pivotally supported by the pivot shafts 16, 16 via bearings 24, 24, and the pivot shafts 16, 16 are fastened to the brackets 6, 6 by nuts 25, 25. There is. In addition, flange portions 4 are provided at the rear ends of the left and right front arms 18a, 19a.
0 are formed, and holes 41 through which the aforementioned implantable bots 20 pass through these flange portions 40.
... has been drilled.

The front arm 18a of the left arm 18 is connected to the transmission shaft 26.
It also serves as a protective case for the rear arm 18.
b constitutes a gear case. That is, the front arm 18a is constituted by a hollow pipe 27 formed by welding a hollow front pipe 27a and a rear pipe 27b, and the transmission shaft 26 is disposed within the hollow pipe 27.
is inserted.

The transmission shaft 26 is configured to be divided into a front shaft portion consisting of a front shaft 28 and a universal joint 45, and a rear shaft portion consisting of an intermediate shaft 29 and a rear shaft 30. The front shaft 28 is connected to the output shaft 3 within the engine case 31.
It is connected to 2. The reciprocating motion of the piston 33 is transmitted as a rotational motion to the crankshaft 35 via the connecting rod 34, and the rotation of this crankshaft 35 is transmitted to the output shaft 32 through various gears 36... and the speed change shaft 37. There is. The output shaft 32 is connected to the front shaft 28 via bevel gears 38 and 39. The universal joint 45 is connected to the rear portion of the front shaft 28, and the front end of the intermediate shaft 29 is removably connected to the universal joint 45 via a spline portion 46. That is, the rear part of the shaft made up of the intermediate shaft 29 and the rear shaft 30 is configured to engage with the front part of the shaft made of the front shaft 28 and the universal joint 45 so as to be removable in the axial direction.

A rubber boot 47 is provided between the front end of the hollow pipe 27 constituting the forearm 18a and the engine case 31 to prevent dust from entering.

The rear shaft portion 30 is housed in a gear case 50 that constitutes the rear arm 18b. gear case 5
As already mentioned, 0 is the implantable bolt 20...
The rear shaft 30 is rotatably housed in the gear case 50 via a bearing 51. The rear shaft 30 meshes with an external gear 53 of the intermediate shaft 29 via an internal gear 52. As described above, the rear arm 19b of the right arm 19 is connected to the front arm 19a by the implantable bolt 20...
and a nut 21... are removably connected to each other. The rear end portions of the left and right rear arms 18b, 19b are connected by a hub portion 61 serving as a rear axle support member.

For example, the rear arm 19b can be formed separately from the hub part 61 as a rear axle support member, and can be coupled to the right end of the hub part 61 as a rear axle support member by an appropriate coupling means. Further, as shown in the drawings, it can be made of aluminum die-casting, and the bearing case 60 can be integrally connected to the rear part of the rear arm 19b, and it can also be molded integrally with the hub part 61.

The left end of the hub portion 61 as a rear axle support member is connected to the gear case 50 via a bolt 62, and the gear case 50 and rear arm 19b are configured as a U-shaped rear unit 63. I can do it.

A bracket 64 is welded to the hub portion 61, and a buffer 65 is bridged between the bracket 64 and the main pipe 3.

A rear axle 66 is, for example, shaped like a hollow pipe and passes through the bearing case 60, the hub portion 61, and the gear case 50. This rear axle 66
One end thereof is pivotally supported by a bearing 67 attached to the outer surface of the gear case 50, and the other end thereof is pivotally supported by another bearing 68 housed in the bearing case 60.

Rear wheels 70, 70 equipped with balloon tires are attached to both ends of the rear axle 66. Furthermore, 71
shows a brake disc mounted on the rear axle 56. The rear axle 66 is coupled to the sleeve 57 via a spline 69.
The sleeve 57 is welded to the bevel gear 55. The rear axle 66 connects the sleeve 57 to the gear case 50.
It is designed to be inserted and removed freely in the direction of the arrow in FIG.

Furthermore, the brackets 6, 6 to which the aforementioned pivot shafts 16, 16 are attached protrude laterally beyond the outer surfaces of the down tubes 4, 4 and the seat pillar tubes 5, 5, as shown in FIG. Pivot shafts 16, 16 are attached to this outwardly projecting portion. The engine 13 is mounted on support pipes 80, 80, which extend between the left and right down tubes 4, 4 and between the left and right seat pillar tubes 5, 5, respectively.
1, 81 and 82, 82 are welded together and are supported on the vehicle body 1 by bolts 83, 84 installed between these brackets 81, 81 and 82, 82. Support pipe 8 that supports the load of the engine 13
0.80 is preferably short in terms of strength. On the other hand, in a shaft drive vehicle, the transmission shaft 26 is connected to the output shaft 32 via bevel gears 38 and 39, so the engine case 31 protrudes laterally to a greater extent than the output shaft 32. Therefore, in the tricycle having the above structure in which the brackets 6, 6 are largely protruded outward, the power of the engine 13 is transferred from the output shaft 32 to the front shaft 28 and the intermediate shaft 29 of the transmission shaft 26.
is transmitted to the rear shaft 30 via the bevel gears 54, 5.
5 to the rear gear 66, the rear axle 66 is driven and the vehicle travels.

In the tricycle configured as described above, in order to assemble the rear arm 17, the front unit 23 is first attached to the pivot shafts 16, 16 with respect to the vehicle body 1.
Attach by. When tightening the pivot shafts 16, 16, it is necessary to support only the front unit 23, which makes installation easier than when supporting the entire rear arm 17. In this case, in the transmission shaft 26, the intermediate shaft 29 is separated from the spline portion 46 with respect to the universal joint 45, and the intermediate shaft 29 is separated from the spline portion 46 with respect to the universal joint 45.
is connected to the rear unit 63 side. Therefore, when assembling the front unit 23 to the brackets 6, 6 via the pivot shafts 16, 16, there is no need to pay attention to the connection of the transmission shaft 26. Therefore, the tightening torque of the pivot shafts 16, 16 can be easily adjusted to a predetermined torque. Next, the rear axle 66, bearings 67, 68, intermediate shaft 29, rear shaft 30, etc. are assembled to the rear unit 63.

At this time, since the rear unit 63 is separated from the front unit 23, it is smaller and lighter than the entire rear arm 17, so it is easy to move and handle, and it is easy to assemble various parts. Also,
Since the rear unit 63 and the front unit 23 can be assembled separately from each other, when assembling the tricycle on the belt conveyor at the factory, the rear axle 66 can be assembled separately from the belt conveyor.
Since the surroundings can be assembled in advance, work efficiency is further improved.

Then, as described above, parts such as the rear wheel 66 are assembled in advance, and the rear unit 63 is attached to the front unit 2.
It is integrally connected to 3. In this case, the transmission shaft 26 and the engine are connected by inserting the stud bolts 20 into the holes 41 of the flange 40.
The intermediate shaft 29 of 6 is connected to the spline portion 4 of the universal joint 45.
You only need to insert it from the rear for 6. Thereafter, by tightening the nuts 21, the rear unit 63 is integrally connected to the front unit 23. At this time, since the implantable bolt 20 and the hole 41 are engaged, the front unit 23 and the rear unit 63 can be easily held in an aligned state, and the tightening work of the nut 21 is facilitated. .

Note that when servicing the various parts inside the gear case 50, the rear unit 63 can be replaced with the front unit 23.
Since it is only necessary to separate the bolts from the bolts, there is no need to remove the pivot shafts 16, 16, which require highly accurate control of the tightening torque. Also, the left arm 18 is the rear arm 1.
Since the gear case 8b also serves as the gear case 50, the gear case 50 opens when the rear unit 63 is separated, making it easy to inspect, repair, and replace various parts.

In addition, in the above embodiment, the transmission shaft 26 is the intermediate shaft 2.
9 and the universal joint 45 are separably connected, the transmission shaft is, for example,
The intermediate shaft 29 and the rear shaft 30 may be separated.

In addition, in the figure, the rear arm 19b of the right arm 19
Although the rear arm 19b and the hub portion 61 are shown as integrally molded, it is also possible to separate the rear arm 19b and the hub portion 61 and connect them to the hub portion 61, etc. as a rear axle support member by an appropriate coupling means. That's good.

Furthermore, in the above embodiment, the unit 63
Before connecting the rear axle 66 to the front unit 23,
Although the front unit 23 and the rear unit 63 are assembled to the rear unit 63, the rear axle may be assembled after the front unit 23 and the rear unit 63 are connected to each other.

As described above, according to the present invention, the arm member into which the transmission shaft of the rear arm is inserted is formed by the front arm and the rear arm, and these are removably connected to each other, and the transmission shaft is connected to the front part of the shaft. Since the rear arm is formed with the rear part of the shaft and these are detachably connected to each other, when the pivot shaft of the rear arm is fastened to the vehicle body, it is only necessary to support the front arm of the rear arm. Therefore, the work of assembling the rear arm to the vehicle body becomes easier.

Further, since the rear arm can be connected to the front arm by integrally connecting the rear arm to the front arm to which parts such as bearings have been attached in advance, the rear arm can be easily assembled.

Note that the connection between the part of the arm member in which the transmission shaft is not inserted and the part connected to the rear axle support member may be made in the middle of the arm member or at the rear end of the arm member. is obvious to those skilled in the art.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, in which Fig. 1 is a front view of the tricycle, Fig. 2 is a plan view, Fig. 3 is a cross-sectional plan view of the rear arm, and Fig. 4 is a cross-sectional view taken along the - line in Fig. 1. It is a side view seen in the arrow direction. In the figure, 1 is the vehicle body, 16 is a pivot shaft, 17 is a rear arm, 18 and 19 are left and right arms (arm members), 1
8a and 19a are forearm, 18b and 19
b is the rear arm, 20 is the bolt, 21 is the nut, 2
3 is the front unit, 26 is the transmission shaft, 28 is the front shaft,
29 is an intermediate shaft, 30 is a rear axle, 61 is a hub portion (rear axle support member), 63 is a rear unit, 66 is a rear axle, and 70 is a rear wheel.

Claims (1)

[Scope of Claims] 1. The front end of a rear arm consisting of a pair of left and right arm members is swingably connected to the vehicle body by a pivot shaft, and the rear axle is pivotally supported between the rear ends of these left and right arm members. , in a vehicle in which rear wheels are attached to both ends of the rear axle, and a transmission shaft that transmits engine power to the rear axle is inserted into one of the arm members, the arm member into which the transmission shaft is inserted is connected to the front arm and the rear axle. The front arm and the rear arm are configured to be removably connected to each other,
The transmission shaft is formed of a front shaft part and a rear shaft part, and the front shaft part and the rear part of the shaft are configured to be removably connected to each other, and the rear arm of the arm member into which the transmission shaft is inserted is The end portion is removably connected to a rear axle support member surrounding the rear axle, and the rear end portion of the other arm member in which the transmission shaft is not inserted is removably connected to the rear axle support member. A shaft drive vehicle with two distinctive rear wheels.