Buffering transmission shaft assembly and gear shifting mechanism

Abstract

The invention discloses a buffering transmission shaft assembly and a gear shifting mechanism, and the buffering transmission shaft assembly comprises a gear, a buffering mechanism and a transmission shaft; the buffer mechanism is arranged between the gear and the transmission shaft; the transmission shaft is sleeved with the buffering mechanism, and the buffering mechanism is sleeved with the gear. The buffering mechanism is used for transmitting power between the gear and the transmission shaft and absorbing impact between the gear and the transmission shaft through elastic deformation. Damage to the gear and the transmission shaft under the working conditions of frequent gear shifting and large gear shifting force can be avoided.

Description

Technical Field

[0001] The present invention relates to the field of mechanical transmission, and in particular to a buffer drive shaft assembly and a shifting mechanism. Background Art

[0002] In the field of mechanical transmission, the shifting mechanism is a core component for realizing power transmission and speed change control, and is widely used in fields such as automotive gearboxes and industrial equipment speed change systems. In traditional shifting mechanisms, gears and drive shafts mostly adopt a rigid connection method, for example, circumferential fixation is achieved through spline fitting. However, in the working conditions of frequent shifting and large shifting forces, the impact force generated during the moment of gear meshing is directly transmitted to the drive shaft, which easily causes cracks in parts such as the root of the spline teeth and the gear web plate, reducing the service life of the gears and drive shafts.

[0003] Therefore, it is particularly necessary to provide a new drive shaft assembly to overcome the damage of gears and drive shafts under the condition of frequent shifting. Summary of the Invention

[0004] The purpose of the present invention is to provide a buffer drive shaft assembly and a shifting mechanism that can avoid the damage of gears and drive shafts under the conditions of frequent shifting and large shifting forces in view of the above problems.

[0005] The technical solution adopted by the present invention is as follows: A buffer drive shaft assembly includes a gear, a buffer mechanism, and a drive shaft; the buffer mechanism is arranged between the gear and the drive shaft; the buffer mechanism is sleeved on the drive shaft, and the gear is sleeved on the buffer mechanism; the buffer mechanism is used for transmitting the power between the gear and the drive shaft and absorbing the impact between the gear and the drive shaft through elastic deformation.

[0006] Further, the buffer mechanism includes a buffer member and a connecting member; the connecting member is sleeved on the drive shaft, and the connecting member is used for connecting the drive shaft and the buffer member; the gear is sleeved on the buffer member, and the buffer member is used for connecting the gear and the connecting member, and the buffer member can undergo elastic deformation.

[0007] Further, the buffer member is a plastic part.

[0008] Further, a gear assembly hole is formed in the middle of the gear, and a plurality of gear assembly flanges are arranged in the gear assembly hole; a connector assembly hole is formed in the middle of the connector, and a plurality of connector assembly flanges are arranged on the outer surface of the connector; a buffer assembly hole is formed in the middle of the buffer, and an outer assembly groove is formed on the outer edge of the buffer. The number of the outer assembly grooves is equal to the number of the gear assembly flanges, and an inner assembly groove is formed in the buffer assembly hole; the number of the inner assembly grooves is equal to the number of the connector assembly flanges; and the shape of the gear assembly flange matches the shape of the outer assembly groove, and the shape of the connector assembly flange matches the shape of the inner assembly groove; the connector is sleeved on the transmission shaft through the connector assembly hole; the buffer is sleeved on the connector through the buffer assembly hole, and the connector assembly flange is assembled in the inner assembly groove; the gear is sleeved on the buffer through the gear assembly hole, and the gear assembly flange is assembled in the outer assembly groove.

[0009] Further, the buffer includes a circular bottom plate, and the buffer assembly hole is formed at the center of the bottom plate; a plurality of partition members are arranged on the plate surface of the bottom plate, and the partition members are arranged at equal intervals around the buffer assembly hole, so that a plurality of assembly grooves are formed on the bottom plate; a plurality of outer baffles matching the shape of the outer edge of the bottom plate and a plurality of inner baffles matching the shape of the buffer assembly hole are arranged on the bottom plate, and the inner baffles and the outer baffles are arranged in a staggered manner at different assembly grooves; the outer baffles are arranged at the outer edge of the bottom plate to seal one end of the assembly groove close to the outer edge of the bottom plate, so that the space surrounded by the outer baffle and the assembly groove forms an inner assembly groove; the inner baffles are arranged at the buffer assembly hole to seal one end of the assembly groove close to the buffer assembly hole, so that the space surrounded by the inner baffle and the assembly groove forms an outer assembly groove.

[0010] Further, both the gear assembly flange and the connector assembly flange are stepped flanges; the inner baffle and the outer baffle have the same height, and both are smaller than the height of the partition member; when the gear is sleeved on the buffer and the buffer is sleeved on the connector, a part of the gear assembly flange is located in the outer assembly groove and contacts the bottom plate, and the other part covers the top of the inner baffle and contacts the outer edge of the connector; a part of the connector assembly flange is located in the inner assembly groove and contacts the bottom plate, and the other part covers the top of the outer baffle and contacts the gear assembly hole.

[0011] Further, an arc chamfer is formed between one end of the partition member close to the outer edge of the bottom plate and the side surface of the partition member; an arc chamfer is formed between one end of the partition member close to the buffer assembly hole and the side surface of the partition member; an arc chamfer is formed between the outer baffle and the side surface of the partition member; an arc chamfer is formed between the inner baffle and the side surface of the partition member.

[0012] Further, an arc chamfer is provided between the side surface of the gear assembly flange and the gear assembly hole; an arc chamfer is provided between the side surface of the gear assembly flange and the end surface of the gear assembly flange; an arc chamfer is provided between the side surface of the connector assembly flange and the outer surface of the connector, and an arc chamfer is provided between the side surface of the connector assembly flange and the end surface of the connector assembly flange.

[0013] Further, the connector is connected to the transmission shaft by means of a spline. Two limit baffles are sleeved on the transmission shaft. The limit baffles are located at both ends of the gear and are used to limit the axial movement of the gear, the buffer member and the connector. An elastic retaining ring is also sleeved on the transmission shaft, and the elastic retaining ring is located on the side of the limit baffle away from the gear.

[0014] The present invention also discloses a shifting mechanism, which includes the above-mentioned buffer transmission shaft assembly.

[0015] In summary, due to the adoption of the above technical solutions, the beneficial effects of the present invention are: In the present invention, due to the existence of the buffer mechanism, under the working conditions of frequent shifting and large shifting force, the impact force generated at the moment of gear meshing can be absorbed by the buffer mechanism, reducing the impact force between the gear and the shaft, and avoiding damage to the gear and the shaft.

[0016] Further, the buffer mechanism adopts a split design. The connector can ensure the rigid force transmission accuracy, and the buffer member can focus on elastic deformation energy absorption. The buffer member is a plastic part. Through elastic deformation, the plastic part can efficiently absorb impact energy. The plastic part has the advantages of impact resistance, noise reduction and extended service life. At the same time, the integral molding process can significantly reduce the manufacturing cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is an exploded view of the transmission shaft assembly; Figure 2 and Figure 3 is a structural diagram of the gear; Figure 4 and Figure 5 is a structural diagram of the buffer member; Figure 6 and 7 is a structural diagram of the connector; Figure 8 is an assembly drawing of the gear and the buffer member; Figure 9 is an assembly drawing of the buffer member and the connector; Figure 10 is an assembly drawing of the gear, the buffer member and the connector; Figure 11 is a clearance diagram between the gear, the buffer member and the connector; In the figure, 1 - transmission shaft, 2 - limit baffle, 3 - buffer member, 4 - gear, 5 - connecting member, 6 - snap ring, 301 - outer assembly groove, 302 - outer baffle, 303 - inner baffle, 304 - inner assembly groove, 305 - separator, 306 - buffer member assembly hole, 307 - bottom plate, 401 - gear assembly hole, 402 - gear assembly flange, 4021 - side surface of the gear assembly flange, 4022 - end surface of the gear assembly flange, 501 - connecting member assembly flange, 5011 - end surface of the connecting member assembly flange, 5012 - side surface of the connecting member assembly flange. Detailed Implementation Manner

[0018] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some but not all of the embodiments of the present invention. The components of the embodiments of the present invention usually described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0019] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0020] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other.

[0021] It should be noted that: similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0022] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship when the product of the present invention is normally placed, or the orientation or positional relationship commonly understood by those skilled in the art. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention. In addition, the terms "first", "second", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0023] In the description of the present invention, it should also be noted that, unless otherwise clearly specified and limited, the terms "set", "installed", "connected", and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. Embodiment 1

[0024] As Figures 1 to 11 shown, the present invention discloses a buffer drive shaft assembly, which includes a gear 4, a buffer mechanism, and a drive shaft 1; the buffer mechanism is arranged between the gear 4 and the drive shaft 1; the buffer mechanism is sleeved on the drive shaft 1, and the gear 4 is sleeved on the buffer mechanism; the buffer mechanism is used to transmit the power between the gear 4 and the drive shaft 1 and absorb the impact between the gear 4 and the drive shaft 1 through elastic deformation.

[0025] Due to the existence of the buffer mechanism, in the working conditions of frequent gear shifting and large gear shifting force, the impact force generated at the moment of gear 4 meshing can be absorbed by the buffer mechanism, reducing the impact force between the gear 4 and the shaft, and avoiding damage to the gear 4 and the shaft.

[0026] The buffer mechanism includes a buffer member 3 and a connecting member 5; the connecting member 5 is sleeved on the drive shaft 1, and the connecting member 5 is used to connect the drive shaft 1 and the buffer member 3; the gear 4 is sleeved on the buffer member 3, the buffer member 3 is used to connect the gear 4 and the connecting member 5, the buffer member 3 can undergo elastic deformation, the buffer member 3 is a plastic part, and the connecting member 5 is a metal part.

[0027] The buffer mechanism adopts a split design. The connecting member 5 can ensure the rigid force transmission accuracy, and the buffer member 3 can focus on elastic deformation energy absorption. The buffer member 3 is a plastic part. Through elastic deformation, the plastic part can efficiently absorb impact energy. The plastic part has the advantages of impact resistance, noise reduction, and extended service life. At the same time, the one-piece forming process can significantly reduce the manufacturing cost.

[0028] Further, a gear assembly hole 401 is formed in the middle of the gear 4, and a number of gear assembly flanges 402 are arranged in the gear assembly hole 401. As Figure 3 shown, there are 3 gear assembly flanges 402; a connecting member 5 assembly hole is formed in the middle of the connecting member 5, and a number of connecting member assembly flanges 501 are arranged on the outer surface of the connecting member 5; As Figure 6As shown, there are 3 connecting piece assembly flanges 501; a buffer assembly hole 306 is provided in the middle of the buffer 3, an outer assembly groove 301 is provided on the outer edge of the buffer 3, the number of the outer assembly grooves 301 is equal to the number of gear assembly flanges 402, and an inner assembly groove 304 is provided in the buffer assembly hole 306; the number of the inner assembly grooves 304 is equal to the number of connecting piece assembly flanges 501; and the shape of the gear assembly flange 402 matches the shape of the outer assembly groove 301, and the shape of the connecting piece assembly flange 501 matches the shape of the inner assembly groove 304; the connecting piece 5 is sleeved on the transmission shaft 1 through the connecting piece 5 assembly hole; the buffer 3 is sleeved on the connecting piece 5 through the buffer assembly hole 306, and the connecting piece assembly flange 501 is assembled in the inner assembly groove 304; the gear 4 is sleeved on the buffer 3 through the gear assembly hole 401, and the gear assembly flange 402 is assembled in the outer assembly groove 301.

[0029] In the above structure, through the precise cooperation of the protrusions and grooves on the gear 4, the connecting piece 5 and the buffer 3, the impact force is buffered and absorbed, the parts are not easily damaged, and at the same time, each component can be quickly aligned and installed, making maintenance and replacement more convenient. The cooperation of the protrusions and grooves can also ensure the precision of force transmission.

[0030] Furthermore, the specific structure of the buffer 3 can be set in the following form: As Figure 4 shown, the buffer 3 includes a circular bottom plate 307, and the buffer assembly hole 306 is provided at the center of the bottom plate 307; a plurality of partition members 305 are provided on the plate surface of the bottom plate 307, and the partition members 305 are arranged at equal intervals around the buffer assembly hole 306, so that a plurality of assembly grooves are formed on the bottom plate 307; as Figure 4 shown, there are 6 assembly grooves; a plurality of outer baffles 302 matching the shape of the outer edge of the bottom plate 307 and a plurality of inner baffles 303 matching the shape of the buffer assembly hole 306 are provided on the bottom plate 307, as Figure 4 shown, there are 3 inner baffles 303 and 3 outer baffles 302; the inner baffles 303 and the outer baffles 302 are arranged in a staggered manner and are provided at different assembly grooves, that is, the inner baffles 303 and the outer baffles 302 cannot appear in the same assembly groove at the same time; the outer baffles 302 are provided at the outer edge of the bottom plate 307 to seal one end of the assembly groove close to the outer edge of the bottom plate 307, so that the space surrounded by the outer baffle 302 and the assembly groove forms the inner assembly groove 304; the inner baffles 303 are provided at the buffer assembly hole 306 to seal one end of the assembly groove close to the buffer assembly hole 306, so that the space surrounded by the inner baffle 303 and the assembly groove forms the outer assembly groove 301.

[0031] In the present invention, the design of the partition plate, the inner baffle 303 and the outer baffle 302 of the buffer member 3 can disperse the impact force to multiple areas for absorption, making the parts more durable. During installation, each part can be easily aligned and clamped, and during maintenance, it is also convenient for disassembly, replacement and repair.

[0032] Furthermore, as shown in Figure 3 and 4 and 6, both the gear assembly flange 402 and the connector assembly flange 501 are stepped flanges; the inner baffle 303 and the outer baffle have the same height, and both are less than the height of the separator 305; when the gear 4 is sleeved on the buffer member 3 and the buffer member 3 is sleeved on the connector 5, as shown in Figure 10 shown, a part of the gear assembly flange 402 is located in the outer assembly groove 301 and contacts the bottom plate 307, and the other part covers the top of the inner baffle 303 and contacts the outer edge of the connector 5; a part of the connector assembly flange 501 is located in the inner assembly groove 304 and contacts the bottom plate 307, and the other part covers the top of the outer baffle 302 and contacts the gear assembly hole 401.

[0033] If they are not stepped flanges and the heights of the inner baffle 303 and the outer baffle are the same as that of the separator 305, the gear 4 and the connector 5 will be completely separated by the buffer member 3, and there is no rigid support between the gear 4 and the connector 5. By setting them as stepped flanges and the heights of the inner baffle 303 and the outer baffle are less than that of the separator 305, it can enable the gear 4 and the connector 5 to have partial direct contact, providing rigid support. While ensuring the absorption of impact, it can also support the overall structure like a "skeleton" to prevent the parts from shaking, making the power transmission more stable and durable. At the same time, the gear 4 and the connector 5 are in mutual abutment, ensuring the coaxiality of the transmission shaft 1 and the gear 4.

[0034] As shown in Figure 3 and 4 and 6 and 10, an arc chamfer is provided between one end of the separator 305 near the outer edge of the bottom plate 307 and the side surface of the separator 305; an arc chamfer is provided between one end of the separator 305 near the buffer member assembly hole 306 and the side surface of the separator 305; an arc chamfer is provided between the outer baffle 302 and the side surface of the separator 305; an arc chamfer is provided between the inner baffle 303 and the side surface of the separator 305.

[0035] An arc chamfer is provided between the side surface 4021 of the gear assembly flange and the gear assembly hole 401; an arc chamfer is provided between the side surface 4021 of the gear assembly flange and the end surface 4022 of the gear assembly flange; an arc chamfer is provided between the side surface 5012 of the connector assembly flange and the outer surface of the connector 5, and an arc chamfer is provided between the side surface 5012 of the connector assembly flange and the end surface 5011 of the connector assembly flange.

[0036] As Figure 11 shown, due to the existence of the arc chamfer, there will be an assembly gap at the arc chamfer between the connecting member assembly flange 501, the gear assembly flange 402 and the buffer member 3. This gap can eliminate the impact and at the same time ensure that the buffer member 3 can undergo elastic deformation.

[0037] In the present invention, the connecting member 5 is connected to the transmission shaft 1 by means of a spline. Two limit baffles 2 are sleeved on the transmission shaft 1. The limit baffles 2 are located at both ends of the gear 4 and are used to limit the axial movement of the gear 4, the buffer member 3 and the connecting member 5. An elastic retaining ring 6 is also sleeved on the transmission shaft 1. The elastic retaining ring 6 is located on the side of the limit baffle 2 away from the gear 4 to further limit the axial movement of the limit baffle. Embodiment 2

[0038] The present invention discloses a shift mechanism, which includes the buffer transmission shaft assembly described in Embodiment 1.

[0039] Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A buffer transmission shaft assembly, characterized in that: It includes a gear (4), a buffer mechanism and a transmission shaft (1); The buffer mechanism is arranged between the gear (4) and the transmission shaft (1); The buffer mechanism is sleeved on the transmission shaft (1), and the gear (4) is sleeved on the buffer mechanism; The buffer mechanism is used to transmit power between the gear (4) and the transmission shaft (1), and absorbs impact between the gear (4) and the transmission shaft (1) through elastic deformation.

2. The buffer transmission shaft assembly according to claim 1, characterized in that: The buffer mechanism comprises a buffer component (3) and a connecting component (5); The connecting member (5) is sleeved on the transmission shaft (1), and the connecting member (5) is used to connect the transmission shaft (1) and the buffer member (3); The gear (4) is sleeved on the buffer component (3); the buffer component (3) is used to connect the gear (4) and the connecting component (5); and the buffer component (3) is capable of elastic deformation.

3. The buffer transmission shaft assembly according to claim 2, characterized in that: The buffer component (3) is a plastic component.

4. The buffer transmission shaft assembly according to claim 3, characterized in that: A gear assembly hole (401) is provided in the middle of the gear (4), and a plurality of gear assembly flanges (402) are provided in the gear assembly hole (401); A connecting member (5) assembly hole is provided in the middle of the connecting member (5), and a plurality of connecting member assembly flanges (501) are provided on the outer surface of the connecting member (5); A buffer assembly hole (306) is provided in the middle of the buffer (3); an outer assembly groove (301) is provided on the outer edge of the buffer (3); the number of the outer assembly grooves (301) is equal to the number of the gear assembly flanges (402); an inner assembly groove (304) is provided in the buffer assembly hole (306); the number of the inner assembly grooves (304) is equal to the number of the connector assembly flanges (501); and the shape of the gear assembly flange (402) matches the shape of the outer assembly groove (301), and the shape of the connector assembly flange (501) matches the shape of the inner assembly groove (304); The connecting piece (5) is sleeved on the transmission shaft (1) through an assembly hole of the connecting piece (5); The buffer component (3) is sleeved on the connecting component (5) through the buffer component assembly hole (306), and the connecting component assembly flange (501) is assembled in the inner assembly groove (304); The gear (4) is sleeved on the buffer component (3) through the gear assembly hole (401), and the gear assembly flange (402) is assembled in the outer assembly groove (301).

5. The buffer transmission shaft assembly according to claim 4, characterized in that: The buffer component (3) comprises a circular bottom plate (307), and the buffer component assembly hole (306) is opened at the center of the bottom plate (307); A plurality of partitions (305) are arranged on the surface of the bottom plate (307), and the partitions (305) are arranged at equal intervals around the buffer assembly hole (306), so that a plurality of assembly grooves are formed on the bottom plate (307); The bottom plate (307) is provided with a plurality of outer baffles (302) whose shapes match the outer edges of the bottom plate (307) and a plurality of inner baffles (303) whose shapes match the buffer component assembly holes (306); The inner baffle plate (303) and the outer baffle plate (302) are staggered and arranged at different assembly grooves; The outer baffle plate (302) is arranged at the outer edge of the bottom plate (307), and the sealing assembly groove is close to one end of the outer edge of the bottom plate (307), so that the space enclosed by the outer baffle plate (302) and the assembly groove constitutes an inner assembly groove (304); The inner baffle plate (303) is arranged at the buffer component assembly hole (306), and the sealing assembly groove is close to one end of the buffer component assembly hole (306), so that the space enclosed by the inner baffle plate (303) and the assembly groove constitutes an outer assembly groove (301).

6. The buffer transmission shaft assembly according to claim 5, characterized in that: The gear assembly flange (402) and the connection piece assembly flange (501) are both stepped flanges; The inner baffle plate (303) and the outer baffle plate have the same height, and are both smaller than the height of the partition (305); When the gear (4) is sleeved on the buffer (3), and the buffer (3) is sleeved on the connecting member (5), a portion of the gear assembly flange (402) is located in the outer assembly groove (301) and contacts the bottom plate (307), and another portion covers the top of the inner baffle (303) and contacts the outer edge of the connecting member (5); A portion of the connector assembly flange (501) is located in the inner assembly groove (304) and contacts the bottom plate (307), while another portion covers the top of the outer baffle (302) and contacts the gear assembly hole (401).

7. The buffer transmission shaft assembly according to claim 6, characterized in that: An arc chamfer is provided between one end of the partition (305) close to the outer edge of the bottom plate (307) and the side surface of the partition (305); An arc chamfer is provided between one end of the partition (305) close to the buffer assembly hole (306) and the side surface of the partition (305); An arc-shaped chamfer is provided between the side surfaces of the outer baffle plate (302) and the partition (305); An arc chamfer is provided between the side surfaces of the inner baffle plate (303) and the separator (305).

8. The buffer transmission shaft assembly according to claim 7, characterized in that: An arc chamfer is provided between the side surface (4021) of the gear assembly flange and the gear assembly hole (401); an arc chamfer is provided between the side surface (4021) of the gear assembly flange and the end surface (4022) of the gear assembly flange; The side surface (5012) of the connector assembly flange and the outer surface of the connector (5) are provided with an arc chamfer, and the side surface (5012) of the connector assembly flange and the end surface (5011) of the connector assembly flange are provided with an arc chamfer.

9. The buffer transmission shaft assembly according to claim 2, characterized in that: The connecting member (5) is connected to the transmission shaft (1) by means of a spline. Two limit baffles (2) are sleeved on the transmission shaft (1). The limit baffles (2) are located at both ends of the gear (4) and are used to limit the axial movement of the gear (4), the buffer member (3) and the connecting member (5). The transmission shaft (1) is also sleeved with an elastic retaining ring (6). The elastic retaining ring (6) is located on the side of the limit baffle (2) away from the gear (4).

10. A gear shifting mechanism, characterized in that: It comprises the buffer transmission shaft assembly according to any one of claims 1 to 9.

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