CN204250292U - Electronic derailleur for bicycles - Google Patents

Abstract

The utility model is an electronic transmission for a bicycle, comprising a frame fixing seat, a linkage unit, a chain guide frame, and a driving unit. The linkage unit has an inner linkage seat and an outer linkage seat. The top ends of the inner and outer linkage seats are respectively pivoted on the frame fixing seat, and the bottom ends of the inner and outer linkage seats are respectively pivoted on the chain guide frame. The driving unit has a motor and a moving part. The motor has a shell and a rotating shaft on the shell. The shell is pivoted on the inner linkage seat, one end of the rotating shaft is located outside the shell and has a screw block. The moving part is pivoted on the top ends of the frame fixing seat and the outer linkage seat and has an axial screw hole. The moving part is screwed to the screw block of the rotating shaft of the motor through the axial screw hole. Such a concealed design can provide a protective effect for the motor during riding.

Description

Electronic derailleur for bicycles

technical field

The utility model relates to bicycles, in particular to an electronic transmission for bicycles.

Background technique

In order to be able to cope with different road conditions, bicycles are usually equipped with a front derailleur and a rear derailleur. The front derailleur is mainly used with a large chainring, and the rear derailleur is installed with the sprocket. The gear ratio between the sprocket and the sprocket is used to achieve the speed change effect.

As far as the prior art is concerned, for example, in U.S. Patent No. 5,254,044, when the motor starts to output power, it will drive the lead screw to move up and down, so that the chain guide frame can change its position through the displacement of the lead screw to achieve the speed change effect, but In this prior patent, no proper protective structure is arranged around the motor, so that the motor is easily damaged by collisions of foreign objects during riding, so there is a need for structural improvement.

Utility model content

The main purpose of the utility model is to provide an electronic transmission for a bicycle, which can provide a good protection effect for the motor.

In order to achieve the above purpose, the electronic transmission of the present invention includes a frame fixing seat, a linkage unit, a chain guide frame, and a driving unit. The linkage unit has an inner linkage seat and an outer linkage seat, the top end of the inner linkage seat is pivotally arranged on the vehicle frame fixing seat, and the top end of the outer linkage seat is pivotally arranged on the vehicle frame fixing seat; The chain guide frame is pivotally arranged at the bottom end of the inner linkage base and the outer linkage base; the drive unit has a motor and a moving part, and the motor has a casing and a rotating shaft arranged on the casing. The casing is pivoted on the inner linkage seat, one end of the rotating shaft is located outside the casing and has a screw block, and the moving part is pivoted on the top of the frame fixing seat and the outer linkage seat and has an axial screw hole , the axial screw hole is screwed to the screw block of the rotating shaft of the motor.

Wherein, the diameter of the axial screw hole of the moving part is larger than the outer diameter of the motor casing, so that the moving part can be sleeved on a part of the motor casing through the axial screw hole.

Wherein, the bottom end of the inner linkage seat and the chain guide frame are pivotally connected together through a pivot, and the linkage unit also has a torsion spring, which is sleeved on the pivot, and the torsion spring One end of the torsion spring abuts against the inner link seat, and the other end of the torsion spring abuts against the chain guide frame.

Wherein, the inner connecting seat has a circular containing groove, and the shell of the motor is passed through the circular containing groove.

Wherein, the frame fixing seat, the top end of the outer linkage seat and the moving part are pivotally connected together through two relative pivots, and the top end of the outer linkage seat has an arc-shaped notch, and the arc-shaped notch covers set on the mobile.

The beneficial effects of the utility model:

From the above, it can be seen that when the rotating shaft of the motor starts to rotate, it will drive the motor itself to move up and down in the axial screw hole of the moving part. During the movement of the motor, the chain guide frame is first driven by the inner carrier Change the position relative to the frame fixing seat, and then in the process of changing the position of the chain guide frame, it will drive the moving part to deflect relative to the frame fixing seat through the outer linkage seat. Such an installation method can prevent the motor from being damaged. The impact damages or affects shifting accuracy and can shorten the overall length of the drive unit.

Description of drawings

Fig. 1 is a perspective view of the utility model.

Fig. 2 is a three-dimensional exploded view of the utility model.

Fig. 3 is a sectional view of the drive unit of the present invention.

Fig. 4 is a plan view of the utility model, mainly showing the state of the chain guide frame before changing positions.

FIG. 5 is similar to FIG. 3 and mainly shows the state of the motor moving relative to the moving part.

Fig. 6 is similar to Fig. 4, and mainly shows the state of the chain guide frame after changing its position.

【Symbol Description】

10 electronic transmission 12 frame

20 frame fixing seat 22 fixing bolts

30 linkage unit 31 inner linkage seat

P1 first pivot P2 second pivot

32 Outer linkage seat 33 Circular storage tank

P3 third pivot P4 fourth pivot

34 arc notch 35 torsion spring

40 chain guide frame 50 drive unit

51 Motor 52 Shell

53 shafts P5 fifth pivot

54 screw block 55 moving parts

56 Axial screw holes

Detailed ways

Please refer to FIG. 1 and FIG. 2 , the electronic transmission 10 of the present invention includes a frame fixing base 20 , a linkage unit 30 , a chain guide frame 40 , and a driving unit 50 .

The frame fixing seat 20 is installed on a frame 12 of the bicycle through a fixing bolt 22, and is used as a main structural support.

The linkage unit 30 has an inner linkage base 31 and an outer linkage base 32 . The top end of the inner link seat 31 is pivotally connected to the frame fixing seat 20 through a first pivot P1, and the bottom end of the inner link seat 31 is pivotally connected to the chain guide frame 40 through a second pivot P2. In addition, the inner link The central position of the moving seat 31 has a circular cavity 33; the top end of the outer moving seat 32 is pivotally connected to the frame fixing seat 20 through two opposite third pivots P3, and the bottom end of the outer moving seat 32 is connected through a fourth pivot. The pivot P4 is pivotally connected to the chain guide frame 40 . In addition, the top end of the outer linkage seat 32 has an arc-shaped notch 34 . On the other hand, the linkage unit 30 also has a torsion spring 35, the torsion spring 35 is sheathed on the second pivot P2 and abuts against the inner linkage seat 31 and the chain guide frame 40 with its two ends to provide reset. strength.

As shown in Figures 2 and 3, the drive unit 50 has a motor 51, the motor 51 has a casing 52 and a rotating shaft 53, the casing 52 is passed through the circular cavity 33 of the inner moving seat 31 and passes through two opposite second The five-pivot P5 is pivotally connected to the inner connecting seat 31 , and one end of the rotating shaft 53 passes through the casing 52 , and one end of the rotating shaft 53 is located outside the casing 52 and has a screw block 54 . In addition, the driving unit 50 further has a moving member 55, which is accommodated in the arc-shaped notch 34 of the outer connecting seat 32 and pivotally connected to the frame fixing seat 20 and the outer connecting seat 32 through the third pivot P3. The top end, in addition, the moving part 55 has an axial screw hole 56, the aperture of the axial screw hole 56 is larger than the outer diameter of the housing 52 of the motor 51, so that the moving part 55 is screwed to the rotating shaft 53 of the motor 51 through the axial screw hole 56 Besides the screw block 54 , it is sleeved on the upper half of the casing 52 of the motor 51 through the axial screw hole 56 .

It can be seen from the above structure that when the rotating shaft 53 of the motor 51 starts to rotate, as shown in FIGS. The axial movement to the screw hole 56, during the movement of the motor 51, as shown in Figures 2, 5 and 6, the housing 52 of the motor 51 will drive the inner moving seat 31 to deflect relative to the frame fixing seat 20. When the linkage seat 31 starts to deflect, on the one hand, it will drive the housing 52 of the motor 51 to force the moving part 55 to deflect relative to the frame fixing seat 20; on the other hand, it will drive the chain guide frame 40 to change its position. In the process of changing the position, the outer linkage seat 32 will be driven to deflect relative to the vehicle frame fixing seat 20, so that the speed change effect can be achieved.

To sum up, in the electronic transmission 10 of the present invention, the motor 51 is configured in an upside-down manner, and a part of the motor 51 is hidden in the moving part 55, so that the motor 51 will be located in the internal linkage after installation. The seat 31 is close to the side of the rear wheel without protruding outwards, which can reduce the risk of the motor 51 being hit by foreign objects and avoid affecting the speed change accuracy of the motor 51. It can also prevent the motor 51 from being damaged by the impact when the bicycle falls down. In addition, the overall length of the drive unit 50 can also be shortened to achieve the purpose of the present invention.

Claims (5)

1. An electronic transmission for a bicycle, characterized in that it comprises: A frame fixing seat; A linkage unit has an inner linkage seat and an outer linkage seat, the top end of the inner linkage seat is pivotally arranged on the vehicle frame fixing seat, and the top end of the outer linkage seat is pivotally arranged on the vehicle frame fixing seat; a chain guide pivotally mounted on the bottom end of the inner carrier and the bottom end of the outer carrier; and A driving unit has a motor and a moving part. The motor has a casing and a rotating shaft arranged on the casing. The casing is pivoted on the inner linkage seat. One end of the rotating shaft is located outside the casing and has a screw block. , the moving part is pivotally arranged on the top of the vehicle frame fixing seat and the outer linkage seat and has an axial screw hole, and the axial screw hole is screwed to the screw block of the rotating shaft of the motor. 2. The electronic transmission for a bicycle as claimed in claim 1, wherein the diameter of the axial screw hole of the moving part is larger than the outer diameter of the motor casing, so that the moving part can be sleeved through the axial screw hole part of the housing of the motor. 3. The electronic transmission for a bicycle as claimed in claim 1, wherein the bottom end of the inner linkage seat and the chain guide frame are pivotally connected together through a pivot, and the linkage unit also has a twist A spring, the torsion spring is sheathed on the pivot, one end of the torsion spring abuts against the inner link seat, and the other end of the torsion spring abuts against the chain guide frame. 4 . The electronic transmission for a bicycle as claimed in claim 1 , wherein the inner linkage seat has a circular cavity, and the motor casing is inserted into the circular cavity. 4 . 5. The electronic transmission for a bicycle as claimed in claim 1, wherein the frame fixing seat, the top end of the outer linkage seat and the moving part are pivotally connected together by two relative pivots, and the outer The top end of the linkage seat has an arc-shaped notch, and the arc-shaped notch is sheathed on the moving part.