A mid-mounted motor fixing structure for bicycle modification

Abstract

The utility model discloses a center-mounted motor fixing structure for bicycle modification, comprising a frame lower tube, a frame rear flat fork, a center-mounted motor, a fixing mechanism and a supporting assembly, wherein the intersection of the frame lower tube and the frame rear flat fork is a frame five-way tube, and the center-mounted motor is connected to the frame five-way tube through the fixing mechanism, and the fixing mechanism comprises a U-shaped fixing frame and a locking bolt, the front side of the U-shaped fixing frame is connected to the center-mounted motor, the bottom of the U-shaped fixing frame is connected to the supporting assembly, and the locking bolt passes through the U-shaped fixing frame and the frame five-way tube to lock and connect the two; when the locking bolt is in an unlocked state, the U-shaped fixing frame can drive the center-mounted motor to rotate around the frame five-way tube to adjust the installation angle; the supporting assembly spreads the frame rear flat fork and the U-shaped fixing frame by a certain distance, so that the center-mounted motor on the front side of the U-shaped fixing frame and the frame lower tube are kept in a tight state; the motor structure has high adaptability to the frame, is firmly fixed and has good concealment, and takes into account both the stability and aesthetics of the vehicle.

Description

Technical Field

[0001] The utility model belongs to the technical field of bicycle modification motors, and in particular relates to a central motor fixing structure used for bicycle modification. Background Art

[0002] With the country's vigorous promotion of green travel, bicycle travel has become more and more popular. Since bicycles are purely human-powered, a motor specially modified for bicycles has come into being. This type of motor can provide a certain amount of assistance, making it easier for riders to ride; due to the wide variety of bicycle frame styles, it has become a key problem to completely fix the motor on the premise of improving adaptability without damaging the frame. At present, the fixing method of modified car motors on the market is to tighten them from the side through a fixed bracket. This method will loosen over a long period of time and cause the motor to sag, and it needs to be tightened frequently. In order to improve the tightness, the usual measure is to place two plates on both sides of the motor and press them against the frame. This method will affect the appearance of the frame. For bicycle modified motors, since this type of motor faces consumers directly, the ease of operation, stability and aesthetics need to be considered in the design of the motor, so the existing fixed structure of the modified car needs to be further improved. Utility Model Content

[0003] In response to the above problems and technical requirements, the utility model provides a mid-mounted motor fixing structure for bicycle modification. The motor structure has high adaptability to the frame, is firmly fixed and well hidden, and takes into account both the stability and aesthetics of the vehicle.

[0004] The technical solution of the utility model is as follows: a mid-mounted motor fixing structure for bicycle modification, comprising a frame lower tube, a frame rear fork, a mid-mounted motor, a fixing mechanism and a supporting assembly, wherein the intersection of the frame lower tube and the frame rear fork is a frame five-way tube, and the mid-mounted motor is connected to the frame five-way tube through the fixing mechanism, and the fixing mechanism comprises a U-shaped fixing frame and a locking bolt, the front side of the U-shaped fixing frame is connected to the mid-mounted motor, the bottom of the U-shaped fixing frame is connected to the supporting assembly, and the locking bolt passes through the U-shaped fixing frame and the frame five-way tube to lock and connect the two; when the locking bolt is in an unlocked state, the U-shaped fixing frame can drive the mid-mounted motor to rotate around the frame five-way tube to adjust the installation angle; the supporting assembly passes through the U-shaped fixing frame from the bottom, and the supporting assembly props the frame rear fork and the U-shaped fixing frame apart by a certain distance, so that the mid-mounted motor on the front side of the U-shaped fixing frame and the frame lower tube are kept in a tight state. In the above scheme, the fixing mechanism locks the mid-mounted motor along the direction of the frame five-way tube, and the support assembly locks the mid-mounted motor along the direction of the frame. The mid-mounted motor is positioned from two directions, which can effectively prevent the motor from loosening during long-term use. The fixing effect is good, and the installation positions of the fixing bracket and the support assembly are relatively concealed, which will not affect the aesthetics of the vehicle body.

[0005] Furthermore, the U-shaped fixing frame includes a bottom plate and two side plates, the bottom plate passes through the bottom of the rear fork of the frame, the two sides of the bottom plate are side plates, the middle of the two side plates are provided with a circular hole for inserting into the five-way tube of the frame, the outer side of the circular hole is provided with a nut cover correspondingly, the two nut covers are correspondingly sealed on the two ends of the five-way tube of the frame, the five-way tube of the frame is provided with a threaded hole, the locking bolt passes through the nut cover from the outside, is fastened to the threaded hole, the side plates are pressed, and the U-shaped fixing frame and the five-way tube of the frame are locked.

[0006] Furthermore, the front side of the side plate is arc-shaped, and the two ends of the front side of the side plate are respectively locked with the screw holes on the peripheral surface of the central motor by a bolt, so that the central motor is fixedly connected to the front of the side plate.

[0007] Furthermore, the U-shaped fixing frame is an integrally formed part.

[0008] In the above scheme, the frame bottom tube is a body fixing structure, and the U-shaped fixing frame is equivalent to being rotatably connected to the frame bottom tube, so that the U-shaped fixing frame can drive the center motor to rotate and adjust, and the center motor can be swung upward to fit closely to the frame bottom tube, and the frame bottom tube provides upper support for the center motor, and the center motor is installed in a compact and stable position; and the nut cover and the locking bolt can press the side plates from both ends, so that the U-shaped fixing frame remains stable and does not shake in the direction of the bottom tube, thereby ensuring the stability of the center motor in this direction.

[0009] Furthermore, the support assembly includes an upper top plate, an adjusting bolt and a nut. The upper top plate is a flat plate that supports the rear fork of the frame from below. Two parallel sliding bars are vertically connected to the bottom surface of the upper top plate. Two positioning holes are provided on the bottom plate of the U-shaped fixing frame. The two sliding bars are correspondingly inserted into the positioning holes to position the upper top plate. A threaded hole is provided on the bottom plate between the two positioning holes. The adjusting bolt is connected to the bottom plate through the threaded hole. The nut is connected to the adjusting bolt. The tail end of the adjusting bolt presses the upper top plate upward, and the nut is locked to the lower surface of the bottom plate. The function of the support assembly is to support the mid-mounted motor from below so that the mid-mounted motor will not loosen and swing in the direction of the frame due to gravity and bumps. The U-shaped fixing frame acts like a lever. The sliding bar of the upper plate is slidably connected to the positioning hole of the bottom plate, which can position the upper plate. As the adjusting bolt is screwed upward, the tail end of the adjusting bolt presses against the upper plate and continues to be screwed upward. The threaded hole of the bottom plate and the adjusting bolt continue to cooperate to press the bottom plate downward. The mid-mounted motor is lifted upward until it is completely against the lower surface of the lower tube of the frame. At this time, the nut is tightened under the bottom plate to lock the adjusted angle.

[0010] Furthermore, the bottom plate of the U-shaped fixing frame is provided with reinforcing ribs. Since the bottom plate has to bear the tightening force of the adjusting bolts, the strength of the bottom plate must be large enough, otherwise it is easy to deform. Providing reinforcing ribs on the bottom plate can improve the strength of the bottom plate.

[0011] Furthermore, an installation angle is formed between the line connecting the center of the five-way tube of the frame and the center of the mid-mounted motor and the horizontal line, and the angle range of the installation angle is -45°-15°. Since the inclination angles of the frame downtubes of different frames are different, and the mid-mounted motor needs to cooperate with the frame downtubes of different angles, different installation angles will be generated. Considering the aesthetics and safety, the preferred angle range is between -45°-15°.

[0012] Compared with the prior art, the beneficial effects of the present invention are as follows: in the present invention, the U-shaped fixing frame locks the central motor along the direction of the frame five-way tube, the frame lower tube provides top support for the central motor, and the support assembly provides top support for the central motor, and the two together restrict the central motor to the triangular area between the frame and the frame five-way tube, so that the central motor is also locked in the direction of the frame, and the central motor locked from two directions is very stable and is not easy to loosen during long-term riding; and the U-shaped fixing frame and the support assembly are both connected to the frame from the bottom of the frame, with strong concealment, and will not affect the overall aesthetics of the frame; at the same time, the structure can be quickly disassembled and assembled through adjusting bolts, locking bolts and other components, which is convenient for modification and maintenance, so the present invention takes into account the requirements of operational portability, installation stability and vehicle aesthetics. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a structural diagram of the installation of the fixed structure of the utility model on the vehicle frame;

[0014] Figure 2 The utility model is a three-dimensional assembly between the vehicle frame and the vehicle frame. Figure 1 ;

[0015] Figure 3 The utility model is a three-dimensional assembly between the vehicle frame and the vehicle frame. Figure 2 ;

[0016] Figure 4 This is a schematic diagram of the installation of the utility model in which the center line of the central motor and the five-way pipe forms an installation angle of -45° with the horizontal line;

[0017] Marked in the figure are: frame down tube 1, frame five-way tube 2, frame rear fork 3, mid-mounted motor 4, fixing mechanism 5, U-shaped fixing frame 51, bottom plate 511, positioning hole 5111, threaded hole 5112, reinforcing rib 5113, side plate 512, nut cover 513, locking bolt 52, bolt 53, support assembly 6, upper top plate 61, slide bar 611, adjusting bolt 62, nut 63. DETAILED DESCRIPTION

[0018] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0019] like Figure 1-3The utility model is shown as a mid-mounted motor fixing structure for bicycle modification, comprising a frame down tube 1, a frame rear fork 3, a mid-mounted motor 4, a fixing mechanism 5 and a supporting assembly 6. The intersection of the frame down tube 1 and the frame rear fork 3 is a frame five-way tube 2, and the mid-mounted motor 4 is connected to the frame five-way tube 2 through the fixing mechanism 5.

[0020] The fixing mechanism 5 includes a U-shaped fixing frame 51 and a locking bolt 52. The front side of the U-shaped fixing frame 51 is connected to the mid-mounted motor 4. The bottom of the U-shaped fixing frame 51 is connected to the support assembly 6. The locking bolt 52 passes through the U-shaped fixing frame 51 and the frame five-way tube 2 to lock and connect the two. Specifically, the U-shaped fixing frame 51 includes a bottom plate 511 and two side plates 512. The bottom plate 511 bypasses directly below the rear flat fork 3 of the frame. The sides of the bottom plate 511 are side plates 512. The middle of the two side plates 512 is provided with a circular hole for inserting into the frame five-way tube 2. The outer side of the circular hole is correspondingly provided with a nut cover 513. The two nut covers 513 are correspondingly sealed on the two ends of the frame five-way tube 2. The frame five-way tube 2 is provided with a threaded hole. The locking bolt 52 passes through the nut cover 513 from the outside and is tightly connected with the threaded hole to press the side plates 512 and lock the U-shaped fixing frame 51 and the frame five-way tube 3.

[0021] The U-shaped fixing frame 51 is an integrally formed part, and a reinforcing rib 5113 is provided on the bottom plate 511 of the U-shaped fixing frame 51. The front side of the side plate 512 is arc-shaped, and the two ends of the front side of the side plate 512 are respectively locked with the screw holes on the peripheral surface of the middle motor 4 by a bolt 53, so that the middle motor 4 is fixedly connected to the front of the side plate 512.

[0022] The support assembly 6 passes through the U-shaped fixing frame 51 from the bottom, and the support assembly 6 props the rear fork 3 of the frame and the U-shaped fixing frame 51 apart by a certain distance, so that the middle motor 4 on the front side of the U-shaped fixing frame 51 is kept in a tight state with the lower tube 1 of the frame. The support assembly 6 includes an upper top plate 61, an adjusting bolt 62 and a nut 63. The upper top plate 61 is a flat plate that supports the rear fork 3 of the frame from below. Two parallel slide bars 611 are vertically connected to the bottom surface of the upper top plate 61. Two positioning holes 5111 are provided on the bottom plate 511 of the U-shaped fixing frame 51. The two slide bars 611 are correspondingly inserted into the positioning holes 5111 to position the upper top plate 61. The bottom plate between the two positioning holes 5111 is provided with a threaded hole, and the adjusting bolt 62 is connected to the bottom plate 511 through the threaded hole. The nut 63 is connected to the adjusting bolt 62. The tail end of the adjusting bolt 62 presses the upper top plate 61 upward, and the nut 63 is locked to the lower surface of the bottom plate.

[0023] The frame bottom tube 2 is a vehicle body fixing structure, and the U-shaped fixing frame 51 is equivalent to being rotatably connected to the frame bottom tube 2, so that the U-shaped fixing frame 51 can drive the middle motor 4 to rotate and adjust, and the middle motor 4 can be swung upward to be close to the frame lower tube 1, and the frame lower tube 1 provides upper support for the middle motor 4, and the installation position of the middle motor 4 is compact and stable; and the nut cover 513 and the locking bolt 52 can press the side plate 512 from both ends, so that the U-shaped fixing frame 51 remains stable and does not shake in the direction of the bottom tube, thereby ensuring the stability of the middle motor 4 in this direction. The function of the support assembly 6 is to support the mid-mounted motor 4 from below so that the mid-mounted motor 4 will not loosen and swing in the direction of the frame due to gravity and bumps. The U-shaped fixing frame 51 acts like a lever. The sliding bar 611 of the upper plate 61 is slidably connected with the positioning hole 5111 of the bottom plate 511, and can position the upper plate 61. As the adjusting bolt 62 is screwed upward, the tail end of the adjusting bolt 62 is against the upper plate 61 and then continuously screwed upward. The threaded hole of the bottom plate 511 and the adjusting bolt 62 continuously cooperate to press the bottom plate 511 downward, and the mid-mounted motor 4 is lifted upward until it is completely against the lower surface of the frame lower tube 1. At this time, the nut 63 is tightened under the bottom plate 511 to lock and fix the adjusted angle.

[0024] The connection line between the center of the frame five-way tube 2 and the center of the mid-mounted motor 4 and the horizontal line forms an installation angle, and the angle range of the installation angle is -45°-15°. Since the inclination angles of the frame downtubes of different frames are different, and the mid-mounted motor 4 needs to cooperate with the frame downtubes of different angles, different installation angles will be generated. Considering the aesthetics and safety, the preferred angle range is between -45°-15°. Figure 4 This is an installation example diagram when the installation angle is -45°.

[0025] The installation principle of the utility model is as follows: the upper top plate 61 directly in contact with the rear fork 3 of the frame is locked by adjusting the bolt 62, so that the top of the middle motor 4 is always in contact with the lower tube 1 of the frame.

[0026] 1) During installation, firstly, the mid-mounted motor 4 and the U-shaped fixing frame 51 are fixedly connected, and the two side plates 512 of the U-shaped fixing frame 51 are sleeved on the frame five-way pipe 2 from both sides, and the U-shaped fixing frame 51 is fixed by pressing the side plates 512 from both sides with nut covers 513;

[0027] 2) Insert the two slide bars 611 of the upper plate 61 into the two positioning holes 5111 to position the upper plate 61. The upper plate 61 can slide up and down along the bottom plate 511 to adapt to various installation angles;

[0028] 3) Connect the adjusting bolt 62 to the bottom plate 511 through the threaded hole, and tighten the tail end of the adjusting bolt 62 against the lower surface of the upper top plate 61 until it cannot be screwed in, and then tighten the nut 63 to the lower surface of the bottom plate 511. At this time, the middle motor 4 is tightly attached to the lower tube 1 of the frame, and the middle motor 4 is completely tightened along the frame direction;

[0029] 4) Screw the locking bolt 52 into the threaded hole of the frame bottom bracket 2, further tighten the nut cover 513 and the side plate 512, and lock the U-shaped fixing frame 51. At this time, the mid-mounted motor 4 is completely tightened along the frame bottom bracket.

[0030] The above are only several preferred embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes and substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A mid-mounted motor fixing structure for bicycle modification, characterized in that: The invention comprises a frame down tube, a frame rear fork, a middle motor, a fixing mechanism and a supporting assembly. The intersection of the frame down tube and the frame rear fork is a frame five-way tube. The middle motor is connected to the frame five-way tube through a fixing mechanism. The fixing mechanism comprises a U-shaped fixing frame and a locking bolt. The front side of the U-shaped fixing frame is connected to the middle motor. The bottom of the U-shaped fixing frame is connected to the supporting assembly. The locking bolt passes through the U-shaped fixing frame and the frame five-way tube to lock and connect the two. When the locking bolt is in an unlocked state, the U-shaped fixing frame can drive the middle motor to rotate around the frame five-way tube to adjust the installation angle. The supporting assembly passes through the U-shaped fixing frame from the bottom, and the supporting assembly spreads the frame rear fork and the U-shaped fixing frame by a certain distance, so that the middle motor on the front side of the U-shaped fixing frame and the frame down tube are kept in a tight state.

2. The mid-mounted motor fixing structure for bicycle modification according to claim 1, characterized in that: The U-shaped fixing frame includes a bottom plate and two side plates. The bottom plate passes through the bottom of the rear fork of the frame. The two sides of the bottom plate are side plates. The middle of the two side plates is provided with a round hole for inserting into the five-way tube of the frame. Nut covers are provided on the outer side of the round hole. The two nut covers are correspondingly sealed on the two ends of the five-way tube of the frame. The five-way tube of the frame is provided with a threaded hole. The locking bolt passes through the nut cover from the outside and is tightly connected with the threaded hole to press the side plates and lock the U-shaped fixing frame and the five-way tube of the frame.

3. The mid-mounted motor fixing structure for bicycle modification according to claim 2, characterized in that: The front side of the side plate is arc-shaped, and the two ends of the front side of the side plate are respectively locked with the screw holes on the peripheral surface of the central motor through a bolt, so that the central motor is fixedly connected to the front of the side plate.

4. The mid-mounted motor fixing structure for bicycle modification according to claim 3 is characterized in that: The U-shaped fixing frame is an integrally formed part.

5. The mid-mounted motor fixing structure for bicycle modification according to claim 4, characterized in that: The support assembly includes an upper top plate, an adjusting bolt and a nut. The upper top plate is a flat plate that supports the rear fork of the frame from below. Two parallel sliding bars are vertically connected to the bottom surface of the upper top plate. Two positioning holes are provided on the bottom plate of the U-shaped fixing frame. The two sliding bars are correspondingly inserted into the positioning holes to position the upper top plate. A threaded hole is provided on the bottom plate between the two positioning holes. The adjusting bolt is connected to the bottom plate through the threaded hole. The nut is connected to the adjusting bolt. The tail end of the adjusting bolt presses the upper top plate upward, and the nut is locked to the lower surface of the bottom plate.

6. The mid-mounted motor fixing structure for bicycle modification according to claim 5, characterized in that: The bottom plate of the U-shaped fixing frame is provided with reinforcing ribs.

7. The mid-mounted motor fixing structure for bicycle modification according to claim 6, characterized in that: An installation angle is formed between a line connecting the center of the five-way tube of the frame and the center of the mid-mounted motor and a horizontal line, and the angle range of the installation angle is -45°-15°.

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