TWM665878U - Transmission - Google Patents

Abstract

A transmission mechanism is suitable for being arranged on a transmission shaft, and comprises a transmission member and a locking member. The transmission member comprises an inner ring surface defining a through hole, and a first surface and a second surface radially extending outward from two opposite circumferences of the inner ring surface, the inner ring surface is formed with an internal thread, and the inner ring surface gradually decreases in diameter from the first surface to the second surface. The locking member is arranged in the through hole and defines a clamping hole for the transmission shaft to pass through. The outer circumferential surface of the locking member is formed with an external thread that can be screwed together with the internal thread formed on the inner ring surface. By tightening the locking piece between the driving shaft and the driving member, the driving member and the driving shaft will not be displaced relative to each other when the novel transmission mechanism is in operation, thereby increasing the service life.

Description

Transmission mechanism

The present invention relates to a transmission mechanism, in particular to a transmission mechanism used in automobiles and motorcycles.

Referring to Figures 1 and 2, a conventional transmission mechanism is suitable for being installed on a transmission shaft 11 and driving a belt (not shown). The transmission shaft 11 has a body section 111, a bolt groove shaft section 112, and a contact section 113 connected between the body section 111 and the bolt groove shaft section 112. The transmission shaft 11 also has a groove 114 at one end of the bolt groove shaft section 112. The bolt groove shaft section 112 is connected to the inner periphery of the contact section 113, and the body section 111 is connected to the outer periphery of the contact section 113.

The conventional transmission mechanism further comprises a gear 12 adapted to drive the belt, and a positioning plate 13 disposed in the groove 114 and used to position the gear 12. A bolt groove 121 is defined in the center of the gear 12. The bolt groove shaft section 112 is penetrated in the bolt groove 121, and the gear 12 abuts against the abutting section 113.

During the operation of the existing transmission mechanism, the gap between the positioning piece 13 and the gear 12, or the gap between the abutting section 113 and the gear 12, causes the gear 12 to continuously shake between the positioning piece 13 and the abutting section 113, which easily causes wear and noise, thereby shortening the service life.

Therefore, the purpose of the present invention is to provide a transmission mechanism that can at least overcome the shortcomings of the prior art.

Therefore, the novel transmission mechanism is suitable for being arranged on a transmission shaft extending along a central axis, and includes a transmission member and a locking member.

The transmission member includes an inner ring surface defining a through hole, and a first surface and a second surface radially extending outward from two opposite circumferences of the inner ring surface. The inner ring surface is formed with an internal thread, and the inner ring surface gradually decreases in diameter from the first surface to the second surface.

The locking piece is arranged in the through hole and defines a clamping hole passing through along the central axis. An outer peripheral surface of the locking piece is formed with an external thread. The clamping hole is suitable for the transmission shaft to pass through along the central axis. The locking piece is clamped between the transmission piece and the transmission shaft so that the transmission piece and the transmission shaft do not rotate relative to each other.

The effect of the present invention is that the locking piece is pressed between the driving shaft and the driving member, so that when the transmission mechanism of the present invention is in operation, the driving member and the driving shaft will not be displaced relative to each other, thereby increasing the service life.

Referring to Figures 3, 4, and 5, an embodiment of the novel transmission mechanism is suitable for being arranged on a transmission shaft 2 extending along a central axis L11, and the transmission shaft 2 includes a bolt groove shaft section 21 at the top end. The top of the embodiment is taken as the top in the figure, but it is not limited to this when implementing. The transmission mechanism is arranged on the bolt groove shaft section 21, and includes a transmission member 3, and a locking member 4 arranged between the transmission shaft 2 and the transmission member 3.

The transmission member 3 is a gear and includes an inner ring surface 32 defining a through hole 31, a first surface 33 and a second surface 34 extending radially outward from two opposite circumferences of the inner ring surface 32, and an outer ring surface 35 extending from the first surface 33 to the second surface 34 and spaced from the inner ring surface 32.

The inner annular surface 32 has a first annular surface 321 and a second annular surface 322 arranged adjacent to each other in the upper and lower parts. The top edge of the first annular surface 321 is connected to the first surface 33, and its diameter is larger than the maximum diameter of the second annular surface 322. The bottom edge of the second annular surface 322 is connected to the second surface 34. The second annular surface 322 is formed with an internal thread. The second annular surface 322 gradually contracts from the first annular surface 321 toward the second surface 34. The outer annular surface 35 is formed with a plurality of gear teeth protruding radially and spaced at equal angles from each other. The through hole 31 has a first hole portion 311 defined by the first annular surface 321, and a second hole portion 312 defined by the second annular surface 322.

In this embodiment, the transmission member 3 further includes four weight-reducing holes 36 formed on the first surface 33 to reduce the weight of the transmission member 3. The weight-reducing holes 36 may be provided in two, six or more numbers or not as required. The weight-reducing holes 36 may also be used as external tools for insertion and fixing during disassembly and assembly.

The locking member 4 is disposed in the through hole 31 and is clamped between the transmission member 3 and the transmission shaft 2 so that the transmission member 3 and the transmission shaft 2 do not rotate relative to each other. The locking member 4 defines a clamping hole 41 that passes vertically along the central axis L11. The clamping hole 41 is a bolt groove and is suitable for the transmission shaft 2 to pass through along the central axis L11.

The locking member 4 includes a loading and unloading section 42 located in the first hole portion 311, a screw-fastening section 43 located in the second hole portion 312 and connected to the loading and unloading section 42, four loading and unloading grooves 44 formed on the top of the loading and unloading section 42, and a stretch seam 45 extending from the inner circumference to the outer circumference. The outer circumference of the screw-fastening section 43 is formed with an external thread.

When the present invention is used, the locking piece 4 is first inserted into the through hole 31 of the transmission piece 3, and rotated one to two turns relative to the transmission piece 3 in the locking direction, so that the locking piece 4 and the transmission piece 3 are not separated. At this time, the size of the clamping hole 41 is slightly larger than the bolt groove shaft section 21, and the locking piece 4 and the transmission piece 3 are sleeved on the bolt groove shaft section 21 of the transmission shaft 2 through the clamping hole 41. Next, a corresponding tool is used to insert the loading and unloading grooves 44, and the locking member 4 is rotated along the screwing direction. The locking member 4 is radially pressed by the second annular surface 322, and the tightening hole 41 is gradually reduced through the expansion slit 45, thereby tightening the locking member 4 between the transmission shaft 2 and the transmission member 3 to complete the installation.

It is worth noting that the outer thread formed on the outer circumferential surface of the screw-fastening section 43 and the inner thread formed on the second annular surface 322 can be installed in coordination and the locking direction of the locking member 4 is the same as the rotation direction of the drive shaft 2. During use, the locking member 4 will be tightened to prevent loosening.

In summary, the locking member 4 is pressed between the drive shaft 2 and the drive member 3, so that when the new transmission mechanism is in operation, the drive member 3 and the drive shaft 2 will not be displaced relative to each other, thereby increasing the service life. Therefore, the purpose of the new transmission mechanism can be achieved.

However, the above is only an example of the implementation of the present invention, and it cannot be used to limit the scope of the implementation of the present invention. All simple equivalent changes and modifications made according to the scope of the patent application of the present invention and the content of the patent specification are still within the scope of the present patent.

2: Drive shaft 21: Bolt groove shaft section 3: Drive member 31: Through hole 311: First hole section 312: Second hole section 32: Inner ring surface 321: First ring surface section 322: Second ring surface section 33: First surface 34: Second surface 35: Outer ring surface 36: Weight reduction hole 4: Locking piece 41: Clamping hole 42: Loading and unloading section 43: Screw-on section 44: Loading and unloading groove 45: Expansion slit L11: Center axis

Other features and functions of the present invention will be clearly presented in the embodiments with reference to the drawings, wherein: FIG. 1 is an incomplete three-dimensional exploded view illustrating a conventional transmission mechanism; FIG. 2 is an incomplete three-dimensional exploded view illustrating the conventional transmission mechanism; FIG. 3 is an incomplete three-dimensional exploded view illustrating an embodiment of the present invention; FIG. 4 is an incomplete three-dimensional view illustrating the embodiment; and FIG. 5 is an incomplete cross-sectional view illustrating the embodiment.

2: Drive shaft

21: bolt groove shaft section

3: Transmission parts

31:Through hole

311: First hole

312: Second hole

32: Inner ring surface

321: First ring face

322: Second ring face

33: First page

34: Second side

35: Outer ring surface

36: Weight loss hole

4: Lock the firmware

41: Clamping hole

42: Loading and unloading section

43: Screw-on section

44: Loading and unloading slot

45:Stretch seams

L11: Center axis

Claims (7)

A transmission mechanism is suitable for being arranged on a transmission shaft extending along a central axis, and comprises: A transmission member, comprising an inner ring surface defining a through hole, and a first surface and a second surface radially extending outward from two opposite circumferences of the inner ring surface, the inner ring surface being formed with an internal thread, and the inner ring surface gradually decreases in diameter from adjacent to the first surface toward the second surface; and A locking piece is arranged in the through hole and defines a clamping hole passing through along the central axis. The outer peripheral surface of the locking piece is formed with an external thread. The clamping hole is suitable for the transmission shaft to pass through along the central axis. The locking piece is clamped between the transmission piece and the transmission shaft so that the transmission piece and the transmission shaft do not rotate relative to each other. A transmission mechanism as described in claim 1, wherein the locking member includes a compression seam extending from the inner circumference to the outer circumference. A transmission mechanism as described in claim 1, wherein the locking member includes a loading and unloading section adjacent to the first surface, and at least one loading and unloading groove formed on the loading and unloading section adjacent to the surface of the first surface. A transmission mechanism as described in claim 3, wherein the locking fixture includes a plurality of loading and unloading slots. A transmission mechanism as described in claim 1, wherein the transmission member is a gear, and the transmission member further includes an outer ring surface extending from the first surface to the second surface and opposite to the inner ring surface, and the outer ring surface is formed with a plurality of radially protruding teeth that are equiangularly spaced from each other. In the transmission mechanism as described in claim 1, one end of the transmission shaft is a bolt groove shaft, wherein the clamping hole is a bolt groove. A transmission mechanism as described in claim 3, wherein the inner annular surface has a first annular surface portion and a second annular surface portion arranged adjacent to each other, the first annular surface portion is adjacent to the first surface and has a diameter greater than the maximum diameter of the second annular surface portion, the second annular surface portion is formed with an internal thread, the second annular surface portion gradually decreases in diameter from the first annular surface portion toward the second surface, the through hole has a first hole portion formed by the first annular surface portion, the locking piece further includes a loading and unloading section adjacent to the first surface, and a screw-fastening section connected to the loading and unloading section and formed with an external thread, the loading and unloading section is arranged in the first hole portion.

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