JPS622047A - Transmission for small type vehicle - Google Patents

Abstract

PURPOSE:To perform automatic meshing, by sliding an outer member and an inner member through resilient deformation of a spring member while utilizing resilient repulsive force of the spring member. CONSTITUTION:Even when an inner member 42a can not be rotated, a transmission, compressing a spring member 44 to be deformed, enables an outer member 43 to be rotated. Here the transmission holds the inner member 42a in a condition that it is urged in a direction changing a speed to be switched by resilient repulsive force of the spring member 44. Accordingly, the transmission, rotating a gear 21b and a slider 30, automatically performs meshing of a dog in the slider 30 and a reversing idle gear 24 by resilient repulsive force of the spring member 44 when a collision is released.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a transmission device for small vehicles such as golf cars and community vehicles.

[Conventional technology]

With the recent rise in oil prices, small vehicles have been attracting widespread attention from the standpoint of resource and energy conservation.

As a small vehicle of this type, 1. In order to make the interior of the vehicle as spacious as possible, the engine and transmission gear device are generally located at the rear of the vehicle body, and the transmission gear device is remotely controlled via an operating wire using a control lever near the seat. is configured to do so. The operating wire is passed between an arm fixed at right angles to the rotating shaft of the operating lever and an arm fixed at right angles to the operated shaft on the speed change gear device side.

However, with this structure, the angle (included angle) between the arm fixed at right angles to the rotation axis of the operating lever and the operating wire connected to this arm changes depending on the operating angle of the operating lever. As a result, the operating amount of the operating lever and the moving amount of the operating wire are not proportional to each other. Therefore, the operating load applied to the operating lever changes as the operating angle changes, resulting in a problem that smooth operability cannot be obtained.

In response to this, the present applicant has proposed that by connecting the pulley on the operating lever side and the pulley on the speed change gear device side via an operating wire, the amount of operation of the operating lever and the amount of movement of the operating wire can be made proportional. A transmission device for a vehicle in which this is possible was previously proposed in Japanese Patent Application No. 59-249479.

Incidentally, unlike ordinary passenger cars, small vehicles are equipped with a transmission gear device having the most basic structure in which transmissions are changed by meshing dogs and gears in order to simplify the structure as much as possible. Therefore, when a dog or a gear collides with a member to be engaged and cannot be engaged, a waiting device is required to properly engage the dogs. I am trying to configure the device.

[Problem that the invention seeks to solve]

However, such a structure has a problem in that the elastic force of the elastic joint must be adjusted after assembly. In other words, the operating wire is stretched by the elastic force of the elastic joints provided between the booms, and unless each elastic joint is adjusted to make the elastic force +8 force equal, the operating wire will be stretched due to the elastic force of the elastic tc force. This is because the pulley will rotate due to being pulled toward the larger elastic joint. In other words, the length of the operating wire including the elastic joint changes due to the difference in elastic force. Additionally, when the dogs collide and cannot engage, it is necessary to operate the operating lever to further elastically deform the elastic joint that has already been elastically deformed in order to tension the operating wire, which reduces the operating force of the operating lever. There was also the inconvenience of being thick.

[Means for solving problems]

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a transmission for a small vehicle that does not require adjustment after assembly and does not require a large operating force on the operating lever. A transmission device for a small vehicle according to the present invention connects a pulley connected to an operating lever and a pulley connected to a cam drum via an operating wire, and connects a pulley connected to an operating lever and a pulley connected to a cam drum so that they are mutually circumferential. A waiting device is provided which is composed of an outer member and an inner member that are slidable in the direction, and these members are connected in the circumferential direction via a spring member.

[Effect]

In the present invention, even if the gear change does not work properly due to a collision between gears or dogs, the rotation of the operating lever is absorbed by elastically deforming the spring member and sliding the outer member and the inner member. At the same time, when the gear or the dog rotates and the collision is released, the spring members automatically mesh with each other due to the elastic force of the spring member.

〔Example〕

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic diagram showing the main parts of a transmission for a small vehicle according to the present invention, FIG. 2 is a sectional view taken along line nn in FIG. 1, and FIG. FIG. 4 is a schematic side view showing a small vehicle equipped with a transmission, and in these figures, the reference numeral 1 indicates the small vehicle. This small vehicle 1 includes a body frame 2 made of pipe material, a body 4 that covers the body frame 2 and forms a cabin having a seat 3 between the body frame 2, and is supported at the front and rear of the body frame 2. The vehicle includes front wheels 5 and rear wheels 6, an engine 7 disposed at the rear of the small vehicle 1, and driving the rear wheels 6.

8 is a support frame that supports the engine 7; 9 is a pair of left and right rear wheel axle tubes supported by a suspension 10 and a rear arm (not shown); between the rain rear wheel axle tubes 9, a reversing mechanism for moving the small vehicle 1 backward; A transmission gear device 1 having
1 is interposed.

Reference numeral 12 denotes a power transmission device that has a V-belt mechanism and continuously changes the speed of the output of the engine 7 and transmits it to the speed change gear device 11. That is, the drive system of the small vehicle 1 is configured to transmit the output of the engine 7 from the power transmission device 12 to the rear wheels 6 via the transmission gear device 11.

Reference numeral 13 denotes an operating lever disposed in the vehicle interior for changing the speed of the transmission gear device 11. The operating lever 13 is connected to the transmission gear device 11 via an operating wire 14, and rotates from neutral to neutral using the rotating shaft 15 as a fulcrum. It is supported so that it can be rotated to shift positions such as , forward, and reverse. A pulley 16 is provided on the rotating shaft 15 and is connected to the operating lever 13 and rotates as the operating lever 13 rotates. A pair of operating wires 14.14 are wound in opposite directions in the outer peripheral groove of the pulley 16, and each end is locked to the pulley 16 by a locking ball 14a. 14b is the operation wire 14
The operating wire I4 is guided to the transmission gear device 11 at the rear of the vehicle body by an outer wire covering the outer wire.

The speed change gear device 11 has an input shaft 21 provided with gears 21a and 21b inside a gear case 20, and a gear speed change shaft 22.
, a cam drum 23 for shift operation that has a cam groove on its surface.
is rotatably supported. Also, a support shaft 2 that slidably supports a reverse play gear 24 for changing speed to reverse.
5, and a shifter shaft 27 that slidably supports a pair of shift forks 26a and 26b that engage with cam grooves of the cam drum 23.

The shift fork 26a moves the reverse idle gear 24 on the shifter shaft 27, thereby shifting the reverse idle gear 24.
is meshed with the gear 21b on the input shaft 21 and the gear 34 rotatably supported on the gear change shaft 22, and the rotation of the input shaft 21 is transmitted to the gear 34 by converting the direction of rotation. In the case of forward movement, the input shaft 21 rotates from gear 21a to gear 2.
8 to the gear transmission shaft 22. The shift fork 26b is engaged with a slider 30 provided on the gear change shaft 22 via a ball 29 so as to be movable in the axial direction. The slider 30 is a small reduction gear 31a rotatably supported by the gear shift shaft 22.

31b, and a gear 34 or a reduction gear 3 provided integrally with the reduction gear 31a is located at both left and right ends.
A dog is provided which engages with 1b. That is, the slider 30, the reduction gear 31b, and the gear 34 constitute a meshing clutch, and transmit the rotation of the gear change shaft 22 to either one of the reduction gears 31a, 31b. Reduction small gear 31a.

31b is a rear wheel axle 3 inserted into a rear wheel axle tube 9, which controls the rotation of the gear shift shaft 22 via large reduction gears 32a, 32b, etc.
3.33.

A gear 35 is provided at one end of the cam drum 23, and this gear 35 meshes with a gear 37 fixed to the other end of a rotating shaft 36 with one end protruding outside the gear case 20.

A waiting device 40 is provided at the protruding end of the rotating shaft 36, and a pulley 41 is provided integrally with this waiting device 40.

The waiting device 40 is a flange-shaped internal member having a cylindrical portion fitted into the rotating shaft 36, as shown in an enlarged sectional view in FIG. 5 and a sectional view taken along the line Vl--Vl in FIG. 5 in FIG. 42a and
A disc-shaped internal member 42b forming an annular groove facing the internal member 42a, an external member 43 fitted into the annular groove so as to be slidable in the circumferential direction with the internal members 42a and 42b, and It is composed of inner members 42a, 42b and a spring member 44 that connects the outer member 43 in the circumferential direction. Internal material 42
The inner peripheral edges of a and 42b are coupled to the rotating shaft 36, and the pulley 41 is integrally provided on the outer peripheral edge of the outer member 43. That is, the waiting device 40 is provided between the pulley 41 and the cam drum 23, and the waiting device 40 is provided between the pulley 41 and the cam drum 23.
is connected to. The spring member 44 is a compression coil spring having a diameter larger than the thickness of the outer member 43, and is loaded in a compressed and deformed state into a plurality of arcuate holes 45 bored at equal intervals in the outer member 43. . In addition, the spring member 44
As shown in FIG. 7, which is a cross-sectional view taken along the line ■--■ in FIG.

46b is in charge.

Operating wires 14.14 are wound in opposite directions in the outer circumferential groove of the pulley 41, and their ends are locked to the boot IJ41 via locking balls 14C114C. Therefore, the pulley 16 on the operation lever 13 side and the pulley 41 on the cam drum 23 side of the speed change gear device 11 are connected via the operation wire 14, and the speed of the speed change gear device 11 is changed by the cam drum 23, which rotates when the operation lever 13 is operated. A switch is made. 47 is a retaining ring that attaches the waiting device 40 to the rotating shaft 36.

In the transmission device for a small vehicle configured in this way,
When the operating lever 13 is rotated, the pulley 16 rotates accordingly, so that one of the operating wires 14 and 14 wound around the pulley 16 is pulled and the other is loosened.

As a result, the pulley 41 is forced to rotate via the operating wire 14.14. This rotation is transmitted to the cam drum 23 from a gear 37 fixed to the rotating shaft 36 via a waiting device 40. That is, when the pulley 41 rotates, the external member 43 provided integrally with the pulley 41 rotates, and this rotation is transmitted to the internal member 42 via the spring member 44, thereby rotating the rotating shaft 36. . Since the shift forks 26a and 26b move on the shifter shaft 27 due to the rotation of the cam drum 23, the slider 30 is in a low-speed forward state in which it is engaged with the reduction gear 31a side.
in a high-speed forward state in which the slider 30 is engaged with the reduction gear 31b, or in a neutral state in which the slider 30 is not engaged in any gear;
The gear is changed to the reverse state where the gear is engaged with the gear.

At this time, the amount of movement of the operating wire 14 is proportional to the outer circumferential length of the rotation of the pulley 16, so the amount of operation of the operating lever 13 and the amount of movement of the operating wire 14 are proportional, and the amount of movement of the operating wire 14 is The pulley 41 also rotates in proportion to the amount of movement of the operating wire 14. Therefore, the operating load of the operating lever 13 that rotates the cam drum 23 does not change depending on the operating angle, thereby allowing smooth operation.

Also, when changing gears, the dog of the slider 30 is connected to the gear 34.
Even if the gear 24 collides with the gear 21b or the gear 34 and cannot be switched properly, the rotation of the pulley 41 will not be hindered and the automatic operation will continue. It is possible to make dogs, etc. engage with each other. This is because the inner member 42 and outer member 43 of the waiting device 40 are connected in the circumferential direction by the spring member 44, and even when the inner member 42 cannot rotate, the operating state of the waiting device 40 is shown in FIG. As shown, the spring member 44
This is because the outer member 43 can rotate because it is compressively deformed. At this time, the internal member 42 is held in a state where it is biased in the direction of shifting by the elastic force of the spring member 44. Therefore, when the collision is canceled due to the rotation of the gear 21b and the slider 30, the dog of the slider 30 and the reverse play gear 24 are engaged by the elastic force of the spring member 44.

Therefore, the waiting device 40 is not provided between the operating wires 14 as in the conventional case, and is not used for tensioning the operating wires 14. Therefore, the waiting device 40 does not have any effect on the tension of the operating wire 14 or
Since there is no need to change the length of the standby device 40, there is no need to adjust the waiting device 40 after assembly.

Moreover, the bullet tΩ given in advance to the spring member 44 of the waiting device 40
The force can be small compared to the tension for tensioning the operating wire 14. Therefore, the force that compresses and deforms the spring member 44 when the gear changeover does not go well can be reduced, so that the operating force of the operating lever 13 does not increase.

〔Effect of the invention〕

As explained above, according to the present invention, the pulley connected to the operating lever and the pulley connected to the cam drum are connected via the operating wire, and the pulley on the cam drum side and the cam drum are connected to each other in the circumferential direction. Since a waiting device is provided which consists of a slidable outer member and an inner member and connects these members in the circumferential direction via a spring member, even when gears do not shift properly due to collisions between gears or dogs, By elastically deforming the spring member and sliding the outer member and the inner member, the rotation of the operating lever is absorbed, and when the gear or dog rotates and the collision is released, the elastic force of the spring member Can be automatically engaged.

Therefore, the waiting device is not used for tensioning the operating wire as in the past, and does not affect the tension or length of the operating wire in any way, so there is no need for post-assembly adjustment. Moreover, the bullet 1 given to the spring member of the waiting device in advance
8 force is smaller than the tension required to tension a conventional operating wire, and when gear shifting does not go well, the spring member can be elastically deformed with a small force, so the operating force of the operating lever does not become large. .

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing the main parts of a transmission for a small vehicle according to the present invention, FIG. 2 is a sectional view taken along line nn in FIG. 1, and FIG. 4 is a schematic side view showing a small vehicle equipped with a transmission, FIG. 5 is an enlarged sectional view showing a waiting device, FIG. 6 is a sectional view taken along the line Vl--Vl in FIG. FIG. 8 is a sectional view showing the operating state of the waiting device. 11... Speed change gear device, 13... Operation lever,
14... Operation wire, 16... Pulley, 23...
...Cam drum, 40...Waiting device, 41--
-Pulley, 42a, 42b...Internal material, 43...
- External material, 44... Spring member.

Claims (1)

[Claims] In a small vehicle in which the speed of a transmission gear device is changed by the rotation of a cam drum connected to an operating lever in the vehicle interior via an operating wire, an operating wire is connected between a pulley connected to the operating lever and a pulley connected to the cam drum. A waiting device is connected between the pulley on the cam drum side and the cam drum, and includes an external member and an internal member that are mutually slidable in the circumferential direction, and these members are connected in the circumferential direction via a spring member. A transmission device for a small vehicle equipped with a