JPS59195485A - Drive for bicycle transmission - 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] (A) Field of Industrial Application This invention relates to a drive device for a bicycle transmission, and particularly to a drive device for a bicycle transmission, in particular, a motor housed in a transmission drive unit is driven by a battery power source to move a transmission shaft in the axial direction. The present invention relates to a drive device for a bicycle transmission, which allows gear shifting operations to be performed by changing gears.

(B) Prior art Figures 1 and 2 show a conventional internal transmission (IA), in which a chain is attached to the tip of the transmission shaft (3A) attached to the hub (2 persons). (4A) are connected, the chain (4A) is turned upward at a substantially right angle at the end of the hollow tube (5A), and is connected to the wire (7A) at the adjustment part (6A), and then connected to the wire (7A) at a hand (not shown). It was connected to a lever. The speed change operation of the speed change shaft (3A) was performed by manually operating a lever at hand.

However, in such a configuration, the hand lever and the gear shift shaft (3
The length of the wire (7A) that connects A) is long, and its length not only changes the moving teeth of the gear shift shaft (3A), but also causes trouble by causing fundamental vibration loss in the wire (7A), etc. There was an inconvenience. In addition, the force applied to the shift shaft (3A) by the chain (4A) is
does not completely match the direction of movement of the transmission shaft (3A), and a bending moment is applied to the transmission shaft (3A), causing not only deformation and damage but also energy loss. In addition, the hand lever and gear shift shaft (3A
) Since no deceleration means is provided between the hub (2
Internal transmission (IA)
Since the configuration of J is complicated and the wire (7A) is essential, there is a problem that the internal transmission (IA) cannot be easily installed.

(c) Purpose of the Invention This invention was made in view of these circumstances, and one of its main objectives is to perform the speed change operation of an internal transmission device within the transmission drive unit without using wires. It is an object of the present invention to provide a drive device for a bicycle transmission that can eliminate each of the above-mentioned disadvantages by using a battery power source for a stored electric motor.

B) Structure of the Invention This invention relates to a bicycle internal transmission system that has a transmission mechanism and a clutch made of planetary gears or the like in a hub. A gearshift shaft that performs gearshift operations in the hub, an electric motor housed in the transmission drive unit and driven by battery power using a hand switch, and a direction changer that converts the rotation of this motor into linear movement in the axial direction of the gearshift shaft. A driving device for a bicycle transmission, comprising means.

(e) Examples The present invention will now be described in detail based on the examples shown in FIGS. 3 to 9. Note that this invention is not limited to this.

In the first embodiment shown in FIGS. 3 to 5, the drive unit M(1) of the bicycle transmission is connected to a carrier (3) of the rear wheel (2).
), (31, the transmission drive unit (4), the hand switch (7) provided near the grip part (6) of the handle (5), and the transmission drive unit (4) and the hand switch (
7) and a connection cord (8) for connecting the two.

The transmission drive unit (4) houses an electric motor (not shown) that is driven by battery power by operating a hand switch (7), and the rotation of this electric motor is controlled by a spur gear (9).
After being decelerated by this, it is transmitted to the worm side coaxial with this. This worm (10i) has a transmission drive unit (4
) The intermediate portion is attached to the support shaft (12) which is pivotally connected to the frame 11), and the elongated hole f131 provided at one end engages with the male threaded part f151 of the gear shift shaft, and the male threaded part is connected by the nut (16). (Folded and fixed as 151/< -(
17) A rectangular opening gear (181) formed at the other end.
are meshing together. The short side of the open gear QB+ is formed to be larger than the root diameter of the worm α1 and smaller than the peak diameter, and the bending lever aη is usually made of an elastic member.

With this configuration, as the worm uO1 rotates in the forward and reverse directions, the open logger hitter that meshes with it is reciprocated in the left-right direction, but the bending lever (1η is fixed to the pivot shaft Q211 held rotatably). Therefore, the actual movement of the bending lever aη is as shown by arrow A (arc movement).At this time, the bending lever Uη engages with the elongated hole αJ at the other end (fixed at 161). The gear shift shaft rotation is
By rotating the worm QOI in the forward and reverse directions, it is moved in the left and right directions as shown by arrow B, and changes the reduction ratio of a conventionally known internal transmission that has an internal planetary gear mechanism and a clutch (both not shown). .

When the transmission drive device (1) is configured as in this embodiment, the following effects can be obtained.

(a) Chain (4A) for axial movement of gear shift shaft rotation
Since wire (7A) is not used, wire (7A) is not used.
There is no change in the amount of movement due to the extension of A), etc., and the transmission drive unit (
4) Installation becomes easy.

(b) Since the rotation of the electric motor can be converted into linear motion in the axial direction of the gear shift axis a by using the bending lever 0η,
It is possible to prevent the gear shift shaft from being deformed or damaged.

(C) Since the speed is also reduced between the worm (101) and the bending lever 0η, the worm (10
), and the configuration of the transmission drive section (4) can be made compact.

(d) If an elastic spring plate is used for the bending lever aη, when the gear shift shaft 04) is locked, the amount of movement can be absorbed by the spring plate, so no abnormal load is applied to the electric motor. , the electric motor, the spur gear (9), and the worm aω can be prevented from being damaged.

6 to 9 show another embodiment of the present invention, in which the shape and structure of the transmission drive section (4) are different from those of the previous embodiment.

In this case, the transmission from the spur gear (221 to the spur gear 125 pivotally connected to the speed change shaft □/D) attached to the electric motor housed in the split case (19), @) is as follows:
gear series prisoner), (23a), f241, (24a
). Here is the spur tooth k (c) and (23a)
, (24) and (24a) are attached coaxially to perform a deceleration effect. (26J is a spur gear that meshes with the spur gear (25a) coaxial with the + gear □□□, and has a function to detect the rotational nature of the gear to detect the rotation of the turtle @ machine 1) Then, the electric motor t21+ is automatically stopped, and the spur gear ii) is stopped at a fixed position.

A male screw (C) is provided at the tip of the boss-shaped portion of the spur gear (25) pivotally mounted on the speed change shaft (141), and the female screw girder of the guide member (C) meshes with this male screw. A guide pin is inserted into the guide hole 6υ provided in the radial protruding piece from the guide member (c). Adjustment between the speed change shaft +141 and the guide member (support) Figure 7 is a front view showing the inside of the transmission drive unit, Figure 8 is a longitudinal sectional view of the same, and Figure 9 is the gear shift shaft. FIG. 3 is a vertical cross-sectional view showing the state after movement.

(1)...Bicycle transmission drive device, (IA)...
Internal transmission, (2 people)...Hub, (4)...Transmission drive unit, (7)...Hand switch, 101...Worm, mouth 1)...Frame, u4)... Speed change shaft, (21)...Electric motor, -Spur gear, Ding...Male thread part,

Claims (1)

[Scope of Claims] 1. In a bicycle internal transmission device that has a transmission mechanism including a planetary gear or the like and a clutch in a hub, the transmission mechanism protrudes from inside the hub in the axial direction, and when pushed or pulled in the axial direction, the inside of the hub is A gear shift shaft that performs gear shifting operations, an electric motor housed in the transmission drive section and driven by battery power using a hand switch, and a direction change that converts the rotation of this motor into linear movement in the axial direction of the gear shift shaft. 2. A driving device for a bicycle transmission, characterized in that the direction changing means comprises an electric motor (a worm which is jointly driven), and a worm which is rotatably supported at an intermediate portion and has a worm at one end. The drive device for a bicycle transmission according to claim 1, comprising a bending lever having a rectangular opening gear that engages with the transmission shaft, and the other end of which is fixed to the transmission shaft. 3. Direction changing means. The spur gear is driven by a motor and is pivotally connected to the transmission shaft, and the spur gear is fixed to the transmission shaft by mating with the male thread formed on the boss of this spur gear, and the guide pin is fixed to the frame. and a guide member movably held in the axial direction by a bicycle transmission drive device according to item 1 of the patent claim.4. The bending lever is formed of a plate-like material, and a rectangular A driving device for a bicycle transmission according to claim 2, wherein the short side of the opening gear is larger than the valley diameter of the worm and smaller than the mountain diameter. 5. Claim 4, wherein the bending lever is made of an elastic material. The drive device for the bicycle transmission described in Section 1.