JPS6210823Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a shift operation lever device for a transmission capable of reversing, which is used in a tricycle, a small four-wheel vehicle, or the like.

For example, as a transmission for a tricycle equipped with balloon tires, the following has been devised, which is a general driving transmission using a gear shift cam similar to that used for motorcycles, with a reverse transmission attached.

One is that a reverse drive gear is provided on the intermediate shaft of a transmission for general driving, a reverse driven gear is spline engaged with the output shaft, and an idle gear for reverse is meshed with the drive gear, and forming a lead groove for a back gear in a gear shift drum for use, and sliding the driven gear through a gear shift fork through the lead groove;
This gear is brought into and out of engagement with the idle gear.

However, in this type of device, a single gear shift drum is rotated to perform both general driving gear shifting and reverse gear shifting, so in order to prevent accidental backward shifting, a stopper is engaged with the drum. It is necessary to ensure that the drum cannot be rotated to the back position unless this stopper is released. Therefore, two rotation operation levers are provided, one for rotating the gear shift drum and one for releasing the stopper, and each lever rotates the drum and releases the stopper via its respective rotation shaft, so two rotation operation levers are provided in the casing of the transmission. It is necessary to provide a dynamic shaft bearing hole.

The other method is basically the same as the one above, but instead of sliding the driven gear using a gear shift drum, a back gear shift fork is fixed to the shift fork shaft, and the shaft is connected by an elastic member. In addition to biasing the shaft in one direction, a stopper cam is disposed at the tip of the shaft in the biasing direction, and by rotating the cam, the driven gear is activated via the shaft and fork under the cooperation of the spring and cam. It slides. In this case as well, two operation levers are provided, one for rotating the drum and one for rotating the stopper cam, and each lever rotates the drum and cam via their respective rotation shafts, so as in the above case, two operation levers are provided on the casing of the transmission. It is necessary to form two rotation shaft bearing holes.

SUMMARY OF THE INVENTION An object of the present invention is to solve the problems of the prior art described above, and to provide a control lever device for a transmission that is compact and prevents erroneous operation.

The feature is that the shift fork is actuated by rotating the gear shift drum, and the shifting sliding gear supported on the rotating shaft is operated in the axial direction to mesh with the designated shifting gear, thereby shifting gears. In the operation lever device of the transmission, two rotating shafts are provided, one rotating shaft is formed in a hollow shape, and the other rotating shaft is inserted into the hollow part of the rotating shaft, and these rotating shafts are A general driving gear shift lever is attached to one of the rotating shafts.
A reverse gear shift operating lever is provided on the other rotating shaft, a stopper cam is attached to the rotating shaft provided with the reverse gear shifting operating lever, and the tip of the shaft equipped with a reverse gear shift fork is brought into contact with the cam surface of this stopper cam, and the above-mentioned The regulating groove of the gear shift drum is formed so that the shaft can slide in the axial direction when the gear shift drum is in the neutral position.

Hereinafter, the present invention will be described in detail with reference to embodiments shown in the drawings.

FIG. 1 is a conceptual cross-sectional view showing one embodiment of the present invention, and shows one applied to the latter type of transmission described above.

To explain this transmission, 1 is an intermediate shaft through which rotation is transmitted from the engine's crankshaft via a clutch (not shown), 2 is an output shaft, and 3 is a known general shaft that is provided between both shafts 1 and 2. It is a multi-speed gear for traveling (only a portion is shown), and a predetermined gear in the gear 3 is slid by a known general gear shift drum 4 for traveling via a gear shift fork (not shown), and is shifted to a predetermined gear. Ru.

The reverse transmission comprises a reverse drive gear 5 provided on the intermediate shaft 1 and a reverse idle gear 6 (not shown in FIG. 1) which is constantly meshed with the gear 5.
2), a back driven gear 7 spline-engaged with the output shaft 2 so as to be disengaged from the gear 6, a back gear shift fork 8 for sliding the gear 7 on the output shaft 2, a shift forkshaft 9 to which the fork 8 is attached, and an elastic member (such as a coil spring) 10 for biasing the shaft 9 in one direction (such as the direction of the arrow A).
a stopper cam 11 disposed at the tip of the shaft 9 in the biasing direction, and a reverse shift operation lever 12 for rotating the cam.

The fork 8 is press-fitted into the shaft 9 or fitted with a circlip 1 in order to move together with the shaft 9.
It is installed by 3rd grade. The above-mentioned shaft 9 is equipped with the above-mentioned general driving gear shift fork (not shown).
It is also attached so that it can slide. The cam 11 is composed of a front plate 11a and a rear plate 11b (see FIG. 3 when viewed from the direction of arrow C in FIG. 1), which are arranged at a predetermined interval in the axial direction of the shaft 9. It is connected to the rotating shaft 15 of the reverse gear change operating lever 12 via the rotating shaft 15. The cam 11 is placed in the upper position (the position shown by the solid line in FIGS. 1 and 3) or the lower position (the position shown by the two-dot chain line in FIG. 3) by operating the lever 12, and when in the upper position, the shaft 9
The distal end thereof abuts on the front plate 11a, and when in the downward position, abuts on the rear plate 11b by elastic members 10, respectively.

Further, the fork 8 is provided with a protrusion 8a, which is fitted into a back gear shift fork regulation groove 4a formed on the drum 4. The drum 4 is arranged in parallel with the output shaft 2, and the regulation groove 4a has a straight part 4b in a direction perpendicular to the axis 4d of the drum 4 and a neutral position N, as shown in FIG. By the way, it consists of a protrusion 4c that protrudes in the axial direction.

The gear shift drum 4 is rotatably operated by a general driving speed change operation lever 17 via a rotary shaft 16.

The operation of this transmission is as follows.

FIG. 1 shows a neutral state, in which the cam 11 is in the upper position and the meshing between the driven gear 7 and the idle gear 6 is disconnected. From this state, when the lever 12 is depressed to move the cam 11 to the lower position, the shaft 9 moves in the direction of arrow A by the elastic member 10 until it comes into contact with the rear plate 11b of the cam. slides into mesh with the idle gear 6, and is shifted backward. Furthermore, during normal driving, the fork protrusion 8a is fitted into the straight part 4b of the regulation groove, so the fork 8 cannot slide in the directions of arrows A and B. Therefore, even if the reverse speed change operation lever 12 is operated, the fork 8 cannot slide. However, it will not be shifted backwards. In addition, when in neutral, the fork 8 slides along the protrusion 4c of the regulation groove by operating the lever 12 and is shifted backward, but when it is shifted backward, the general driving gear shift operation lever 17 is operated. Even if you try to do so, the protrusion 8a
c, the drum 4 cannot rotate.
It will not be shifted to general driving.

Conventionally, the two rotation shafts 15, 1 of the transmission
6 were separately provided, and each rotating shaft was inserted into two bearing holes formed in the casing 20 of the transmission. The operating lever device according to the present invention is configured such that the journal portions of the two rotating shafts are integrated into one body and inserted into one bearing hole of the casing.

That is, as shown in FIG. 1, the rotation shaft 15 of the reverse gear shift operation lever 12 is formed in a hollow shape, and the rotation shaft 1 of the general driving gear shift operation lever 17 is formed in the hollow part of the shaft 15.
6, the journal portions of both rotating shafts 15 and 16 are integrally assembled and inserted into one bearing hole formed in the casing 20 of the transmission. A stopper cam arm 14 is connected to the inner end of the casing 20 of the rotation shaft 15 so as to rotate together with the rotation shaft 15. That is, a radial groove 15a is formed at the end of the shaft 15, and a hole 14a is formed in the arm 14 to fit into the shaft 15, and the groove 15a of the shaft is formed inwardly of the hole 14a. A protrusion 14b is formed which fits into the protrusion 14b. Then, the hole 14a and the protrusion 14b are engaged with the shaft 15 and the groove 15a, and the arm 14 is inserted from the end of the shaft 15 to the left in FIG. It has been done. The arm 14 has a shaft 15
The cam 1 extends from the radial direction to both sides in the radial direction.
1 is provided, the other is bent into an L shape, one end of a tension spring 22 is locked to its tip, the other end of the spring 22 is locked to a stopper 23 protruding from the casing 20, and the spring 22 causes the cam 11 to is always biased toward the upper position (the position shown by the solid line in FIG. 5), and the arm 14 is positioned by the stopper 23.

In this device, the operating lever 17 is used to change the speed for normal driving. In this case, the stopper cam arm 14 is positioned at the upper position by the spring 22 and the stopper 23, so the reverse driven gear 7 and the idle gear 6 are not engaged. It doesn't match. Then, when the operating lever 12 is depressed in the neutral state shown in FIG. 1, the cam arm 14
The cam 11 rotates together with the rotation shaft 15 against the spring 22, the cam 11 is in the lower position (the position shown by the two-dot chain line in FIGS. 3 and 5), and the driven gear 7 slides in the direction of the arrow A and becomes idle. It meshes with gear 6 and is shifted backwards. When the operating lever 12 is released from this state, the cam 11 is moved to the upper position by the spring 22 (set to be stronger than the elastic member 10) and returns to the neutral state.

As described above, according to the operating lever device for a transmission according to the present invention, two rotation shafts are provided, one of the rotation shafts is formed in a hollow shape, and the other rotation shaft is formed in the hollow part of the rotation shaft. Insert the rotating shafts, and install a general driving gear shift lever on one of these rotating shafts, and a reverse gear shifting lever on the other rotating shaft, and attach the rotating shaft equipped with the reverse gear shifting lever to the rotating shaft. A stopper cam is attached, and the end of the shaft attached with a back gear shift fork is brought into contact with the cam surface of the stopper cam, and the regulating groove of the gear shift drum is set so that the shaft can slide in the axial direction when the gear shift drum is in the neutral position. The following effects can be achieved by forming the diaphragm.

The reverse gear shift control lever can only be operated when the gear shift drum is in the neutral position. Also,
Even if the reverse gear shift operation lever is operated when the gear shift drum is not in the neutral position, the shaft equipped with the reverse gear shift fork will not be operated, so there is no risk of erroneous operation. Furthermore, since the stopper cam can also be provided on the same axis as the rotation axis of the reverse gear change operation lever, it is possible to achieve further compactness.

[Brief explanation of the drawing]

1 is a cross-sectional conceptual diagram showing an embodiment of the operating lever device of the transmission according to the present invention; FIG. 2 is a cross-sectional conceptual diagram showing the reverse drive gear, idle gear, and driven gear of the transmission of FIG. 1; Figure 3 is a view of the cam in Figure 1 viewed from the direction of arrow C, Figure 4 is a developed view of the regulating groove for the back gear shift fork in Figure 1, and Figure 5 shows the operating lever device in Figure 1 as shown in arrow D. 6 and 7 are views of the rotation shaft of the reverse shift operation lever and the stopper cam arm, respectively, as viewed from the direction of arrow D in FIG. 1. 12... Reverse speed change operation lever, 14... Stopper cam arm, 15... Rotating shaft (one rotating shaft), 16... Rotating shaft (other rotating shaft), 17...
General driving gear shift control lever.

Claims (1)

[Scope of utility model registration request] A transmission device in which a shift fork is actuated by rotation of a gear shift drum, and a sliding gear for shifting supported on a rotating shaft is operated in the axial direction to mesh with a predetermined gear for shifting, thereby changing gears. In the operating lever device, two rotating shafts are provided, one rotating shaft is formed into a hollow shape, the other rotating shaft is inserted into the hollow part of the rotating shaft, and one of these rotating shafts is A general driving gear shift lever is provided on one rotating shaft, a reverse gear shift operating lever is provided on the other rotating shaft, a stopper cam is attached to the rotating shaft provided with the reverse gear shifting operating lever, and a reverse gear shift lever is mounted on the cam surface of this stopper cam. Operation of a transmission device characterized in that a regulating groove of a gear shift drum is formed so that a tip of a shaft equipped with a fork is elastically abutted so that the shaft can slide in the axial direction when the gear shift drum is in a neutral position. lever device.