Balance shaft gear of motorcycle engine

Abstract

The utility model discloses a balance shaft gear of a motorcycle engine, and relates to the technical field of balance shaft gears of motorcycle engines. The transmission mechanism comprises a balance shaft, a driven gear assembly, a driving gear and a crankshaft assembly, the cylindrical damping rubber block is arranged between the balance gear center sleeve piece and the balance shaft driven gear, so that the balance shaft driven gear plays a role in damping and buffering under the condition that the balance shaft driven gear is subjected to impact force during speed change after rotation; the damping pressure spring is arranged between the balance gear center sleeve piece and the balance shaft driven gear to play a counter-acting force to push the balance shaft driven gear to reset, and flexible meshing plays a role in reducing noise; the elastic washer and the flat washer are installed between the balance gear center sleeve piece and the balance shaft driven gear, friction and hard collision between the two parts are reduced, and the elastic washer and the flat washer are used for achieving the anti-loosening effect after the balance shaft and the driven gear assembly are fastened with the balance shaft right balancing weight.

Description

Technical Field

[0001] The utility model relates to the technical field of motorcycle engine balance shaft gears, in particular to a motorcycle engine balance shaft gear. Background Art

[0002] When a motorcycle engine is working, it provides power to the vehicle. While transmitting power, it also generates large vibrations to the frame and body parts. The driver feels the vibration when gripping the steering handle. Therefore, a balance shaft gear device is added to the design of the motorcycle engine. Its function is to reduce the transmission of engine vibration to the vehicle, increase the service life of the motorcycle and its components, and improve the riding comfort for the rider or driver. A large number of gears are used in the engine for transmission. The gear transmission is accurate and reliable, but the gear transmission will produce a certain amount of noise.

[0003] The existing motorcycle engine design is composed of a driving gear and a driven gear as well as a balance shaft and a counterweight assembly. The driving gear and the driven gear are usually integrated (as shown below). Figure 1 (As shown in the figure), gears generally have gear teeth, tooth grooves, end faces, normal faces, tooth top circles, tooth root circles, base circles and pitch circles. When two gears are meshed, the tooth top of one gear always enters the tooth root of the other gear. In order to prevent thermal expansion from blocking and to provide space for storing lubricating oil, small holes are opened on the main surface of the gear to reduce weight. The balance shaft gear device is installed in the engine and is driven and transmitted by the gears on the engine crankshaft. The balance shaft driven teeth of this design generate relatively large noise when receiving power transmission, which is mainly due to the vibration generated when the gears transmit torque. The gear side clearance is the main source of vibration. Gears are also easily damaged, and the cost of replacing parts during maintenance is high. Therefore, the utility model provides a balance shaft gear for a motorcycle engine to solve the above-mentioned problems. Utility Model Content

[0004] The purpose of the utility model is to provide a balance shaft gear of a motorcycle engine to solve the problems raised in the above background technology.

[0005] To achieve the above objectives, the present invention provides the following technical solutions:

[0006] A balance shaft gear of a motorcycle engine comprises a balance shaft and driven gear assembly and a driving gear and crankshaft assembly. The balance shaft and driven gear assembly is assembled from a balance shaft driven gear assembly, a balance shaft assembly, a balance shaft left counterweight, a third bearing, a fourth bearing, a semicircular key, a balance shaft right counterweight, a gasket and a nut. The driving gear and crankshaft assembly is assembled from a driving gear, a crankshaft assembly, a first bearing, a second bearing and a connecting rod.

[0007] As a further solution of the present invention, the balancing shaft assembly includes an intermediate step shaft, a balancing shaft left counterweight, a thread, a first bearing supporting cylindrical surface, a second bearing supporting cylindrical surface, a balancing shaft driven gear cylindrical surface and a first square keyway, the left end of the intermediate step shaft is provided with a first bearing supporting cylindrical surface, the right end of the intermediate step shaft is provided with a second bearing supporting cylindrical surface, the second bearing supporting cylindrical surface is provided with a left counterweight, a third bearing is provided on the first bearing supporting cylindrical surface, a fourth bearing is provided on the second bearing supporting cylindrical surface, the left end of the first bearing supporting cylindrical surface is provided with a balancing shaft driven gear cylindrical surface, a first square keyway is provided on the cylindrical surface of the balancing shaft driven gear, and a nut is threadedly connected on the cylindrical surface of the balancing shaft driven gear, and a corresponding nut is provided on the cylindrical surface of the balancing shaft driven gear. The balancing shaft assembly is easily assembled by setting the intermediate step shaft, the balancing shaft left counterweight, the thread, the first bearing supporting cylindrical surface, the second bearing supporting cylindrical surface, the balancing shaft driven gear cylindrical surface and the first square keyway.

[0008] As a further solution of the present invention, a semicircular key is provided in the first square keyway, and a balancing shaft driven gear assembly is sleeved on the cylindrical surface of the balancing shaft driven gear, a balancing shaft right counterweight is provided at the left end of the balancing shaft driven gear assembly, and a gasket is provided between the balancing shaft driven gear assembly and the nut. The coordinated use of the first square keyway and the semicircular key structure facilitates the installation of the balancing shaft driven gear assembly and the balancing shaft right counterweight.

[0009] As a further solution of the present invention, the balancing shaft driven gear assembly consists of a balancing gear center kit, a balancing shaft driven gear, a cylindrical damping rubber block and a damping compression spring, the balancing gear center kit is sleeved with a balancing shaft driven gear, a cylindrical damping rubber block is provided between the balancing gear center kit and the balancing shaft driven gear, and an elastic washer and a flat washer are sleeved between the balancing gear center kit and the balancing shaft driven gear, the balancing gear center kit includes a balancing gear center sleeve, the balancing gear center sleeve is provided with a first rectangular groove and a second rectangular groove, the middle part of the balancing gear center sleeve is provided with an axial hole, the inner wall of the axial hole is provided with a rectangular concave key groove, and the balancing gear center sleeve is symmetrically provided with a first cylindrical hole and a second cylindrical hole respectively, the first cylindrical hole and the second cylindrical hole are both provided with a balancing gear center sleeve positioning pin, the balancing gear center sleeve is provided with a first semicircular concave surface and a second semicircular concave surface, and the balancing gear center sleeve is conveniently composed of the balancing gear center kit, the balancing shaft driven gear, the cylindrical damping rubber block and the damping compression spring structure.

[0010] As a further solution of the present invention, the balance shaft driven gear includes a tooth surface, a first trapezoidal groove plane and a second trapezoidal groove plane are provided on the tooth surface, a third trapezoidal groove plane and a fourth trapezoidal groove plane are symmetrically provided on the tooth surface, a first U-shaped groove and a second U-shaped groove are respectively symmetrically provided on the tooth surface from top to bottom, and a first semicircular groove and a second semicircular groove are respectively symmetrically provided on the tooth surface from left to right. The tooth surface, the first trapezoidal groove plane, the second trapezoidal groove plane, the third trapezoidal groove plane, the fourth trapezoidal groove plane, the first semicircular groove, the second semicircular groove, the first U-shaped groove and the second U-shaped groove structure are conveniently formed into a balance shaft driven gear.

[0011] As a further solution of the present invention, a first cylindrical groove, a first rectangular groove, a second cylindrical groove, a second rectangular groove, a first trapezoidal groove and a second trapezoidal groove are formed between the balance gear center kit and the balance shaft driven gear. Damping compression springs are provided in the first rectangular groove and the second rectangular groove, and the damping compression spring structure is used in conjunction to provide a buffering effect.

[0012] As a further solution of the present invention, the right counterweight block of the balancing shaft includes a second square keyway, a third cylindrical hole, a semicircular block and a heat dissipation hole. The right counterweight block of the balancing shaft is provided with a third cylindrical hole corresponding to the cylindrical surface of the driven gear of the balancing shaft, and the inner wall of the third cylindrical hole is provided with a second square keyway. The right counterweight block of the balancing shaft is provided with a semicircular block, and the right counterweight block of the balancing shaft is provided with a number of heat dissipation holes. The right counterweight block of the balancing shaft is provided with a gravity effect.

[0013] As a further solution of the present invention, the crankshaft assembly is provided with a connecting rod, and a first bearing and a second bearing are respectively provided on both sides of the corresponding connecting rod of the crankshaft assembly. The crankshaft assembly is provided with a driving gear, which is engaged with the driven gear of the balance shaft. The connecting rod is provided to facilitate the rotation of the driving gear.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: when the present invention is used, the cylindrical damping rubber block is installed between the balance gear center kit and the balance shaft driven gear, and the balance shaft driven gear is subjected to impact force when the speed is changed (accelerated or decelerated) after rotation, which plays a shock-absorbing and buffering role; the damping compression spring is installed between the balance gear center kit and the balance shaft driven gear to play a reaction force to push the balance shaft driven gear to reset, and the flexible meshing plays a noise reduction role; the elastic washer and the flat washer are installed between the balance gear center kit and the balance shaft driven gear to reduce the friction and hard collision between the two parts, and are used to prevent the balance shaft and the driven gear assembly from loosening after being fastened to the right counterweight block of the balance shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1The diagram is a schematic planar cross-sectional structure diagram of a balance shaft gear of a motorcycle engine.

[0016] Figure 2 The figure is a schematic diagram of the structure of a balance shaft gear of a motorcycle engine.

[0017] Figure 3 The present invention is a structural schematic diagram of the connection between a balance gear center kit and a balance shaft driven gear in a balance shaft gear of a motorcycle engine.

[0018] Figure 4 The present invention is a schematic structural diagram of a balance shaft driven gear in a balance shaft gear of a motorcycle engine.

[0019] Figure 5 The diagram is a structural diagram of the right counterweight of the balance shaft in the balance shaft gear of a motorcycle engine.

[0020] Figure 6 The present invention is a structural schematic diagram of a balance gear center kit in a balance shaft gear of a motorcycle engine.

[0021] Figure 7 This is a curve diagram of torque and rotation angle in the balance shaft gear of a motorcycle engine.

[0022] In the figure: 1, nut; 100, balance shaft driven gear assembly; 101, tooth surface; 102, cylindrical damping rubber block; 103, damping compression spring; 104, first cylindrical groove; 105, first rectangular groove; 106, second cylindrical groove; 107, second rectangular groove; 108, first trapezoidal groove; 109, second trapezoidal groove; 110, balance gear center kit; 111, balance gear center sleeve; 112, first First rectangular groove; 113, second rectangular groove; 114, first cylindrical hole; 115, shaft hole; 116, rectangular concave keyway; 117, second cylindrical hole; 118, first semicircular concave surface; 119, second semicircular concave surface; 120, balance shaft driven gear; 121, first trapezoidal groove plane; 122, second trapezoidal groove plane; 123, third trapezoidal groove plane; 124, fourth trapezoidal groove plane; 125, first semicircular groove; 126 , second semicircular groove; 127, first U-shaped groove; 128, second U-shaped groove; 129, balancing gear center sleeve positioning pin; 130, elastic washer; 131, flat washer; 1000, balancing shaft and driven gear assembly; 2, gasket; 200, driving gear and crankshaft assembly; 201, driving gear; 202, connecting rod; 210, crankshaft assembly; 220, first bearing; 230, second bearing; 300, balancing shaft assembly; 301 , middle step shaft; 302, left counterweight of balancing shaft; 303, thread; 304, first bearing supporting cylindrical surface; 305, second bearing supporting cylindrical surface; 306, cylindrical surface of driven gear of balancing shaft; 307, first square keyway; 310, third bearing; 320, fourth bearing; 4, semicircular key; 400, right counterweight of balancing shaft; 401, second square keyway; 402, third cylindrical hole; 403, semicircular block; 404, heat dissipation hole. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0024] In this utility model, the word "exemplary" is used to mean "serving as an example, illustration or description". Any embodiment described in this utility model as "exemplary" is not necessarily to be construed as being more preferred or advantageous than other embodiments. The following description is given to enable any person skilled in the art to implement and use the utility model. In the following description, details are listed for the purpose of explanation. It should be understood that a person of ordinary skill in the art can recognize that the utility model can be implemented without using these specific details. In other examples, well-known structures and processes are not described in detail to avoid obscuring the description of the utility model with unnecessary details. Therefore, the utility model is not intended to be limited to the embodiments shown, but is consistent with the widest scope consistent with the principles and features disclosed in the utility model.

[0025] Example

[0026] See also Figures 1 to 7 In an embodiment of the present invention, a balance shaft gear of a motorcycle engine includes a balance shaft and driven gear assembly 1000 and a driving gear and crankshaft assembly 200. The balance shaft and driven gear assembly 1000 is assembled from a balance shaft driven gear assembly 100, a balance shaft assembly 300, a balance shaft left counterweight 302, a third bearing 310, a fourth bearing 320, a semicircular key 4, a balance shaft right counterweight 400, a gasket 2 and a nut 1. The driving gear and crankshaft assembly 200 is assembled from a driving gear 201, a crankshaft assembly 210, a first bearing 220, a second bearing 230 and a connecting rod 202.

[0027] The balancing shaft assembly 300 includes an intermediate stepped shaft 301, a balancing shaft left counterweight 302, a thread 303, a first bearing support cylindrical surface 304, a second bearing support cylindrical surface 305, a balancing shaft driven gear cylindrical surface 306 and a first square keyway 307. The left end of the intermediate stepped shaft 301 is provided with a first bearing support cylindrical surface 304, the right end of the intermediate stepped shaft 301 is provided with a second bearing support cylindrical surface 305, and a balancing shaft left counterweight is provided on the second bearing support cylindrical surface 305. Block 302, a third bearing 310 is provided on the first bearing supporting cylindrical surface 304, a fourth bearing 320 is provided on the second bearing supporting cylindrical surface 305, a balancing shaft driven gear cylindrical surface 306 is provided at the left end of the first bearing supporting cylindrical surface 304, a first square keyway 307 is provided on the balancing shaft driven gear cylindrical surface 306, and a nut 1 is threadedly connected on the balancing shaft driven gear cylindrical surface 306, and a thread 303 is provided on the balancing shaft driven gear cylindrical surface 306 corresponding to the nut 1.

[0028] Specifically, the balancing shaft assembly 300 is easily formed by setting the intermediate step shaft 301, the balancing shaft left counterweight 302, the thread 303, the first bearing support cylindrical surface 304, the second bearing support cylindrical surface 305, the balancing shaft driven gear cylindrical surface 306 and the first square keyway 307.

[0029] A semicircular key 4 is provided in the first square keyway 307 , and a balancing shaft driven gear assembly 100 is sleeved on the cylindrical surface 306 of the balancing shaft driven gear. A balancing shaft right counterweight 400 is provided at the left end of the balancing shaft driven gear assembly 100 , and a gasket 2 is provided between the balancing shaft driven gear assembly 100 and the nut 1 .

[0030] Specifically, the first square keyway 307 and the semicircular key 4 are used in conjunction with each other to facilitate installation of the balancing shaft driven gear assembly 100 and the balancing shaft right counterweight 400 .

[0031] The balancing shaft driven gear assembly 100 is composed of a balancing gear center kit 110, a balancing shaft driven gear 120, a cylindrical damping rubber block 102 and a damping compression spring 103. The balancing gear center kit 110 is sleeved with the balancing shaft driven gear 120. A cylindrical damping rubber block 102 is provided between the balancing gear center kit 110 and the balancing shaft driven gear 120. An elastic washer 130 and a flat washer 131 are sleeved between the balancing gear center kit 110 and the balancing shaft driven gear 120. The balancing gear center kit 110 includes a balancing gear center. Sleeve 111, the balance gear center sleeve 111 is provided with a first rectangular groove 112 and a second rectangular groove 113, the balance gear center sleeve 111 is provided with an axial hole 115 in the middle, the inner wall of the axial hole 115 is provided with a rectangular concave key groove 116, and the balance gear center sleeve 111 is symmetrically provided with a first cylindrical hole 114 and a second cylindrical hole 117 respectively, and the first cylindrical hole 114 and the second cylindrical hole 117 are provided with a balance gear center sleeve positioning pin 129, and the balance gear center sleeve 111 is provided with a first semicircular concave surface 118 and a second semicircular concave surface 119.

[0032] Specifically, the balance gear center kit 110 , the balance shaft driven gear 120 , the cylindrical damping rubber block 102 and the damping compression spring 103 are provided to form the balance shaft driven gear assembly 100 .

[0033] The balance shaft driven gear 120 includes a tooth surface 101, on which a first trapezoidal groove plane 121 and a second trapezoidal groove plane 122 are provided, and a third trapezoidal groove plane 123 and a fourth trapezoidal groove plane 124 are symmetrically provided on the tooth surface 101. The tooth surface 101 is symmetrically provided with a first U-shaped groove 127 and a second U-shaped groove 128 respectively, and the tooth surface 101 is symmetrically provided with a first semicircular groove 125 and a second semicircular groove 126 respectively.

[0034] Specifically, the tooth surface 101, the first trapezoidal groove plane 121, the second trapezoidal groove plane 122, the third trapezoidal groove plane 123, the fourth trapezoidal groove plane 124, the first semicircular groove 125, the second semicircular groove 126, the first U-shaped groove 127 and the second U-shaped groove 128 are arranged to facilitate the formation of the balance shaft driven gear 120.

[0035] A first cylindrical groove 104, a first rectangular groove 105, a second cylindrical groove 106, a second rectangular groove 107, a first trapezoidal groove 108 and a second trapezoidal groove 109 are formed between the balance gear center kit 110 and the balance shaft driven gear 120, and a damping compression spring 103 is provided in the first rectangular groove 105 and the second rectangular groove 107.

[0036] Specifically, the provided damping compression spring 103 structure is used in conjunction with the provided structure to provide a buffering effect.

[0037] The right counterweight block 400 of the balancing shaft includes a second square keyway 401, a third cylindrical hole 402, a semicircular block 403 and a heat dissipation hole 404. The right counterweight block 400 of the balancing shaft is provided with a third cylindrical hole 402 corresponding to the cylindrical surface 306 of the driven gear of the balancing shaft, and the inner wall of the third cylindrical hole 402 is provided with a second square keyway 401. The right counterweight block 400 of the balancing shaft is provided with a semicircular block 403, and the right counterweight block 400 of the balancing shaft is provided with several heat dissipation holes 404.

[0038] Specifically, the right counterweight 400 of the balancing shaft is provided to facilitate providing a gravity effect.

[0039] The crankshaft assembly 210 is provided with a connecting rod 202 , and a first bearing 220 and a second bearing 230 are respectively provided on both sides of the crankshaft assembly 210 corresponding to the connecting rod 202 . The crankshaft assembly 210 is provided with a driving gear 201 , which is meshed with the balance shaft driven gear 120 .

[0040] Specifically, the connecting rod 202 is provided to drive the driving gear 201 to rotate.

[0041] The working principle of this utility model is:

[0042] When the utility model is used, the first trapezoidal groove 108 and the second trapezoidal groove 109 of the balancing shaft driven gear 120 are aligned with the positioning pin 129 of the balancing gear center sleeve, and then the balancing gear center kit 110 is fitted with the elastic washer 130 and the flat washer 131. Then, the damping compression spring 103 is installed in the first cylindrical groove 104, the second cylindrical groove 106, the first rectangular groove 105 and the second rectangular groove 107. A cylindrical damping spring 103 is provided between the balancing gear center kit 110 and the balancing shaft driven gear 120. The nylon rubber block 102, the balance shaft and the driven gear assembly 1000 are assembled by first press-fitting the fourth bearing 320 and the third bearing 310 into the balance shaft assembly 300, inserting the woodruff key 4 into the first square keyway 307, and simultaneously installing the balance shaft driven gear assembly 100 with the rectangular concave keyway 116 aligned with the first square keyway 307. Then, when installing the balance shaft right counterweight 400, the second square keyway 401 is aligned with the woodruff key 4, and the balance shaft right counterweight 400 is fitted tightly to the balance shaft driven gear assembly 100.

[0043] Then install the washer 2 and then install the nut 1 on the thread 303 of the balance shaft assembly 300 and tighten it. Start the engine, and the connecting rod 202 pushes the crankshaft assembly 210 to drive the driving gear 201 to rotate. The driving gear 201 thereby transmits power to the balance shaft driven gear 120. When it is accelerated and subjected to impact force, the balance shaft driven gear 120 rotates counterclockwise by the cylindrical damping rubber block 102. When it rotates to the limited position, the cylindrical surface of the balancing gear center sleeve positioning pin 129 contacts the second trapezoidal groove plane 122 of the balance shaft driven gear 120, and the cylindrical surface of the balancing gear center sleeve positioning pin 129 on the other side of the symmetrical structure contacts the third trapezoidal groove plane 123 of the balance shaft driven gear 120.

[0044] At the same time, the reaction force of the damping compression spring 103 pushes the balance shaft driven gear 120 to reset. When it is subjected to impact force during deceleration, the balance shaft driven gear 120 rotates clockwise by the cylindrical damping rubber block 102 as a buffer. When it rotates to the limited position, the cylindrical surface of the balancing gear center sleeve positioning pin 129 contacts the first trapezoidal groove plane 121 of the balance shaft driven gear 120, and the cylindrical surface of the balancing gear center sleeve positioning pin 129 on the other side of the symmetrical structure contacts the fourth trapezoidal groove plane 124 of the balance shaft driven gear 120. At the same time, the reaction force of the damping compression spring 103 pushes the balance shaft driven gear 120 to reset, thereby playing a buffering role during the deceleration or acceleration process of the engine driving gear 201;

[0045] The cylindrical damping rubber block 102 is installed between the balance gear center kit 110 and the balance shaft driven gear 120. When the balance shaft driven gear 120 is rotated and the speed is changed (accelerated or decelerated), it will play a shock-absorbing and buffering role. The damping compression spring 103 is installed between the balance gear center kit 110 and the balance shaft driven gear 120 to play a reaction force to push the balance shaft driven gear 120 to reset. The flexible meshing plays a noise reduction role. The elastic washer 130 and the flat washer 131 are installed with the balance gear Between the center kit 110 and the balance shaft driven gear 120, the friction and hard collision between the two parts are reduced, and it is used to prevent the balance shaft and driven gear assembly 1000 from loosening after being fastened to the balance shaft right counterweight 400. The positioning pin 129 of the balance gear center sleeve is rotated to a fixed angle in the trapezoidal groove of the balance shaft driven gear 120 to play a limiting role, thereby reducing the cost of maintenance parts. If the tooth surface 101 is damaged, only the balance shaft driven gear 120 needs to be replaced, and there is no need to replace the entire set of assembly parts such as the balance shaft right counterweight 400.

[0046] Although the present invention has been described above with reference to various embodiments, it should be understood that many changes and modifications may be made without departing from the scope of the present invention. That is, the methods, systems, or devices discussed above are all examples. Various configurations may omit, replace, or add various processes or components as appropriate. For example, in an alternative configuration, the method may be performed in an order different from that described, and / or various stages may be added, omitted, and / or combined. Moreover, the features described with respect to certain configurations may be combined in various other configurations. Different aspects and elements of the configurations may be combined in a similar manner. In addition, as technology develops, many elements are merely examples and do not limit the scope of this disclosure or the claims.

[0047] Specific details are given in the specification to provide a thorough understanding of the exemplary configurations including implementations. However, the configurations can be practiced without these specific details. For example, well-known circuits, processes, algorithms, structures, and techniques have been shown without unnecessary detail to avoid obscuring the configurations. This description provides only example configurations and does not limit the scope, applicability, or configurations of the claims. On the contrary, the foregoing description of the configurations will provide those skilled in the art with an enabling description for implementing the described techniques. Various changes may be made to the functions and arrangements of the elements without departing from the spirit or scope of this disclosure.

[0048] Furthermore, although each operation may be described as a sequential process, many operations may be performed in parallel or simultaneously. Furthermore, the order of the operations may be rearranged. A process may have additional steps. Furthermore, examples of the methods may be implemented in hardware, software, firmware, middleware, code, hardware description languages, or any combination thereof. When implemented in software, firmware, middleware, or code, the program code or code segments for performing the necessary tasks may be stored in a non-transitory computer-readable medium such as a storage medium, and the described tasks may be performed by a processor.

[0049] In summary, it is intended that the above detailed description be considered illustrative rather than restrictive, and it should be understood that the claims (including all equivalents) are intended to define the spirit and scope of the present invention. The above embodiments should be understood as merely illustrating the present invention and not to limit the scope of protection of the present invention. After reading the contents of the present invention, technicians can make various changes or modifications to the present invention, and these equivalent changes and modifications also fall within the scope defined by the claims of the present invention.

Claims

1. A balance shaft gear of a motorcycle engine, comprising a balance shaft and driven gear assembly (1000) and a driving gear and crankshaft assembly (200), characterized in that: The balancing shaft and driven gear assembly (1000) is assembled from a balancing shaft driven gear assembly (100), a balancing shaft assembly (300), a balancing shaft left counterweight (302), a third bearing (310), a fourth bearing (320), a semicircular key (4), a balancing shaft right counterweight (400), a gasket (2) and a nut (1); the driving gear and crankshaft assembly (200) is assembled from a driving gear (201), a crankshaft assembly (210), a first bearing (220), a second bearing (230) and a connecting rod (202); the crankshaft assembly (210) is provided with a connecting rod (202), and the crankshaft assembly (210) is provided with a first bearing (220) and a second bearing (230) on both sides of the corresponding connecting rod (202); the crankshaft assembly (210) is provided with a driving gear (201), and the driving gear (201) is meshed with the balancing shaft driven gear (120).

2. The balance shaft gear of a motorcycle engine according to claim 1, characterized in that: The balancing shaft assembly (300) comprises an intermediate stepped shaft (301), a balancing shaft left counterweight (302), a thread (303), a first bearing support cylindrical surface (304), a second bearing support cylindrical surface (305), a balancing shaft driven gear cylindrical surface (306), and a first square keyway (307). The left end of the intermediate stepped shaft (301) is provided with the first bearing support cylindrical surface (304), the right end of the intermediate stepped shaft (301) is provided with the second bearing support cylindrical surface (305), and the balancing shaft left counterweight is provided on the second bearing support cylindrical surface (305). (302), a third bearing (310) is provided on the first bearing supporting cylindrical surface (304), a fourth bearing (320) is provided on the second bearing supporting cylindrical surface (305), a balancing shaft driven gear cylindrical surface (306) is provided at the left end of the first bearing supporting cylindrical surface (304), a first square keyway (307) is provided on the balancing shaft driven gear cylindrical surface (306), and a nut (1) is threadedly connected on the balancing shaft driven gear cylindrical surface (306), and a thread (303) is provided on the balancing shaft driven gear cylindrical surface (306) corresponding to the nut (1).

3. The balance shaft gear of a motorcycle engine according to claim 2, characterized in that: A semicircular key (4) is provided in the first square keyway (307), and a balancing shaft driven gear assembly (100) is sleeved on the cylindrical surface (306) of the balancing shaft driven gear. A balancing shaft right counterweight (400) is provided at the left end of the balancing shaft driven gear assembly (100), and a gasket (2) is provided between the balancing shaft driven gear assembly (100) and the nut (1).

4. The balance shaft gear of a motorcycle engine according to claim 1, characterized in that: The balancing shaft driven gear assembly (100) is composed of a balancing gear center kit (110), a balancing shaft driven gear (120), a cylindrical damping rubber block (102) and a damping compression spring (103); the balancing shaft driven gear (120) is sleeved on the balancing gear center kit (110); a cylindrical damping rubber block (102) is provided between the balancing gear center kit (110) and the balancing shaft driven gear (120); and an elastic washer (130) and a flat washer (131) are sleeved between the balancing gear center kit (110) and the balancing shaft driven gear (120).

5. The balance shaft gear of a motorcycle engine according to claim 4, characterized in that: The balance gear center kit (110) includes a balance gear center sleeve (111), the balance gear center sleeve (111) is provided with a first rectangular groove (112) and a second rectangular groove (113), a shaft hole (115) is provided in the middle of the balance gear center sleeve (111), the inner wall of the shaft hole (115) is provided with a rectangular concave key groove (116), and the balance gear center sleeve (111) is symmetrically provided with a first cylindrical hole (114) and a second cylindrical hole (117) in the upper and lower parts, and a balance gear center sleeve positioning pin (129) is provided in each of the first cylindrical hole (114) and the second cylindrical hole (117), and the balance gear center sleeve (111) is provided with a first semicircular concave surface (118) and a second semicircular concave surface (119).

6. The balance shaft gear of a motorcycle engine according to claim 5, characterized in that: The balance shaft driven gear (120) includes a tooth surface (101), a first trapezoidal groove plane (121) and a second trapezoidal groove plane (122) are provided on the tooth surface (101), a third trapezoidal groove plane (123) and a fourth trapezoidal groove plane (124) are symmetrically provided on the tooth surface (101), a first U-shaped groove (127) and a second U-shaped groove (128) are symmetrically provided on the tooth surface (101) in upper and lower directions, and a first semicircular groove (125) and a second semicircular groove (126) are symmetrically provided on the tooth surface (101) in left and right directions.

7. The balance shaft gear of a motorcycle engine according to claim 6, characterized in that: A first cylindrical groove (104), a first rectangular parallelepiped groove (105), a second cylindrical groove (106), a second rectangular parallelepiped groove (107), a first trapezoidal groove (108) and a second trapezoidal groove (109) are formed between the balance gear center kit (110) and the balance shaft driven gear (120).

8. The balance shaft gear of a motorcycle engine according to claim 7, characterized in that: Damping compression springs (103) are provided in both the first rectangular parallelepiped groove (105) and the second rectangular parallelepiped groove (107).

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