Reinforced torque transmission device of transmission auxiliary box intermediate shaft

Abstract

The utility model provides a reinforced torque transmission device of a transmission auxiliary box intermediate shaft. The reinforced torque transmission device mainly solves the technical problem that the torque transmission capacity of an existing auxiliary box intermediate shaft assembly cannot meet the working requirement of a high-horsepower engine. The torque transmission device comprises an intermediate shaft, a gear and a reinforcing ring. Wherein one end of the intermediate shaft is a driving end for connecting a driving motor, and the other end of the intermediate shaft is a transmission end; the gear is provided with a center hole in the axial direction, and the transmission end of the intermediate shaft penetrates through the center hole of the gear to be in interference fit with the gear and is fixed to the joints of the two sides of the gear through welding. The reinforcing ring is located in an annular groove in the side, close to the intermediate shaft, of the gear, and the axial thickness of the reinforcing ring is matched with the groove depth of the annular groove. The groove wall of the side, close to the middle shaft, of the annular groove is defined as an inner ring face, the groove wall of the side, away from the middle shaft, of the annular groove is defined as an outer ring face, the inner ring face of the reinforcing ring is matched with the inner ring face of the annular groove in size, and a gap is formed between the outer ring face of the reinforcing ring and the outer ring face of the annular groove.

Description

Technical Field

[0001] The utility model relates to an interference torque transmission structure, in particular to a reinforced torque transmission device of an intermediate shaft of a transmission auxiliary box. Background Art

[0002] Road transport is the dominant mode of freight transport in my country, and commercial vehicles have become the main equipment for road transport due to their large load capacity and high cost-effectiveness in long-distance transport. In recent years, with the continuous increase in the mileage of China's expressways and the continuous improvement of road surface grades, China's commercial vehicle market has also developed rapidly and has become the world's largest heavy-duty commercial vehicle market.

[0003] As the core component of commercial vehicles, transmissions directly affect all performance indicators of the vehicle. During long-distance transportation across the country and across the north and south, vehicles need to maintain sufficient power at all times and have stable and economical fuel consumption. High-horsepower engines have emerged, and the corresponding development of high-power-density commercial vehicle transmissions is imminent.

[0004] At present, the auxiliary box intermediate shaft assembly structure of the heavy-duty commercial vehicle transmission is to connect the intermediate shaft and the gear by welding + interference fit, thereby improving the transmission torque. The Chinese patent with publication number CN210566125U discloses a transmission intermediate shaft welding structure, which optimizes the weld structural parameters at the joint between the blade gear and the intermediate shaft shoulder, so that the weld filling rate and excess height are increased, thereby improving the welding quality and transmission torque. However, with the birth of high-horsepower engines, this type of welding structure has experienced weld cracking failures in bench tests and the aftermarket. It can be seen that the torque transmission capacity of the auxiliary box intermediate shaft assembly based on this welding structure is obviously unable to meet the working requirements of high-horsepower engines. Utility Model Content

[0005] The utility model aims to provide a reinforced torque transmission device for a transmission auxiliary box intermediate shaft, mainly to solve the technical problem that the torque transmission capacity of the existing auxiliary box intermediate shaft assembly cannot meet the working requirements of a high-horsepower engine.

[0006] In order to achieve the above purpose, the technical solution of the utility model is as follows:

[0007] A reinforced torque transmission device for a transmission auxiliary box intermediate shaft, which is special in that:

[0008] Includes intermediate shaft, gear and a reinforcing ring;

[0009] One end of the intermediate shaft is a driving end, which is used to connect to the driving motor, and the other end is a transmission end;

[0010] The gear is provided with a center hole along the axial direction, the transmission end of the intermediate shaft passes through the center hole of the gear and is interference-connected with the gear, and the connection with both sides of the gear is fixed by welding;

[0011] The reinforcement ring is located in the annular groove on the side of the gear close to the intermediate shaft, and is coaxial with the axis of the gear center hole; the axial thickness of the reinforcement ring is matched with the groove depth of the annular groove; the groove wall on the side of the annular groove close to the intermediate shaft is defined as the inner annular surface, and the groove wall on the side away from the intermediate shaft is defined as the outer annular surface, the inner annular surface of the reinforcement ring is matched with the inner annular surface size of the annular groove, and gaps are respectively provided between the outer annular surface of the reinforcement ring and the outer annular surface of the annular groove, and between the reinforcement ring and the groove bottom of the annular groove.

[0012] Furthermore, the interference connection between the inner ring surface of the reinforcement ring and the inner ring surface of the annular groove can further improve the interference torque transmission capability of the intermediate shaft.

[0013] Furthermore, the gap between the outer ring surface of the reinforcement ring and the outer ring surface of the annular groove is ≥0.5 mm, and the gap between the reinforcement ring and the bottom of the annular groove is ≥0.2 mm.

[0014] Furthermore, the reinforcement ring is made of GCr15, which has high hardness, high wear resistance and good toughness.

[0015] Furthermore, the transmission end of the intermediate shaft passes through the center hole of the gear and is interference-connected with the gear, and the connection with both sides of the gear is fixed by welding.

[0016] In addition, the utility model also provides a reinforced torque transmission device for the intermediate shaft of the transmission auxiliary box, which is special in that:

[0017] It includes an intermediate shaft, a gear and a plurality of reinforcing rings which are coaxial and sleeved in sequence;

[0018] One end of the intermediate shaft is a driving end, which is used to connect to the driving motor, and the other end is a transmission end;

[0019] The gear is provided with a center hole along the axial direction, and the transmission end of the intermediate shaft passes through the center hole of the gear and is connected to the gear;

[0020] A plurality of reinforcing rings which are sleeved in sequence are located in an annular groove on the side of the gear close to the intermediate shaft and are coaxial with the axis of the gear center hole; the axial thickness of each reinforcing ring is adapted to the groove depth of the annular groove; the groove wall on the side of the annular groove close to the intermediate shaft is defined as the inner annular surface, and the groove wall on the side away from the intermediate shaft is defined as the outer annular surface, wherein the inner annular surface of the innermost reinforcing ring is adapted to the size of the inner annular surface of the annular groove, and gaps are provided between the outer annular surface of the outermost reinforcing ring and the outer annular surface of the annular groove, and between each reinforcing ring and the bottom of the annular groove.

[0021] Furthermore, the inner ring surface of the innermost reinforcement ring and the inner ring surface of the annular groove, as well as each reinforcement ring are connected in interference connection.

[0022] Furthermore, the gap between the outer ring surface of the outermost reinforcement ring and the outer ring surface of the annular groove is ≥0.5mm, the gap between each reinforcement ring and the bottom of the annular groove is ≥0.2mm, and multiple reinforcement rings are arranged in sequence in the torque transmission direction to ensure that the gear blank has sufficient flexibility, thereby improving the problem of tooth lateral load in gear meshing.

[0023] Compared with the prior art, the utility model has the following beneficial effects:

[0024] 1. The utility model provides a reinforced torque transmission device for a transmission auxiliary box intermediate shaft, comprising an intermediate shaft, a gear and a reinforcement ring, wherein the reinforcement ring is located in an annular groove on the side of the gear close to the intermediate shaft. The arrangement of the reinforcement ring makes the connection between the intermediate shaft and the gear more stable, thereby improving the torque transmission capacity of the intermediate shaft, thereby meeting the working requirements of a high-horsepower engine.

[0025] 2. In the reinforced torque transmission device of the transmission auxiliary box intermediate shaft provided by the utility model, the inner ring surface of the reinforcing ring and the inner ring surface of the annular groove are connected by interference, which can further improve the torque transmission capacity of the intermediate shaft and the power density of the commercial vehicle transmission auxiliary box, thereby reducing after-sales failures of commercial vehicle transmissions.

[0026] 3. In the reinforced torque transmission device of the auxiliary box intermediate shaft of the transmission provided by the utility model, the material of the reinforcement ring is GCr15, which has high hardness, high wear resistance and good toughness, thereby improving the working stability of the transmission.

[0027] 4. The utility model provides a reinforced torque transmission device for the intermediate shaft of the transmission auxiliary box, which can further improve the torque transmission capacity of the intermediate shaft by setting a plurality of reinforcement rings. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 The utility model is a structural assembly diagram of a first embodiment of a reinforced torque transmission device for an intermediate shaft of a transmission auxiliary box.

[0029] Figure 2 It is a structural explosion diagram of a first embodiment of a reinforced torque transmission device for an auxiliary box intermediate shaft of a transmission according to the utility model.

[0030] Figure 3 It is a partial cross-sectional view of a first embodiment of a reinforced torque transmission device for an auxiliary box intermediate shaft of the utility model.

[0031] The reference numerals are as follows:

[0032] 1- gear, 11- annular groove, 2- intermediate shaft, 3- reinforcement ring. DETAILED DESCRIPTION

[0033] The present invention is further described in detail below in conjunction with specific embodiments.

[0034] Embodiment 1

[0035] Combination Figure 1 , Figure 2 , Figure 3 As shown, this embodiment provides a reinforced torque transmission device for the intermediate shaft of the transmission auxiliary box, including an intermediate shaft 2, a gear 1 and a reinforcement ring 3.

[0036] One end of the intermediate shaft 2 is a driving end for connecting to a driving motor, and the other end is a transmission end for connecting to the gear 1 and providing transmission torque.

[0037] The gear 1 is provided with a center hole in the axial direction, and the transmission end of the intermediate shaft 2 passes through the center hole of the gear 1 and is connected with the gear 1 by interference fit, and the connection with the two sides of the gear 1 is fixed by welding. The hub of the gear 1 close to the intermediate shaft 2 is provided with an annular groove 11 in the axial direction, which is coaxial with the axis of the center hole of the gear 1. The reinforcement ring 3 is located in the annular groove 11, and the axial thickness of the reinforcement ring 3 is adapted to the groove depth of the annular groove 11.

[0038] In this embodiment, the groove wall of the annular groove 11 close to the intermediate shaft 2 is defined as the inner ring surface, and the groove wall away from the intermediate shaft 2 is defined as the outer ring surface. The inner ring surface of the reinforcing ring 3 is adapted to the inner ring surface size of the annular groove 11. A gap is provided between the outer ring surface of the reinforcing ring 3 and the outer ring surface of the annular groove 11, and the gap is generally ≥0.5mm; a gap is also provided between the reinforcing ring 3 and the groove bottom of the annular groove 11, and the gap is generally ≥0.2mm. Sufficient installation gap can also be reserved according to actual installation requirements, or the radial and / or axial thickness of the reinforcing ring 3 can be appropriately adjusted.

[0039] The inner ring surface of the reinforcing ring 3 is connected with the inner ring surface of the annular groove 11 by interference fit, which further improves the torque transmission capacity of the intermediate shaft. The reinforcing ring 3 is made of GCr15, which has high hardness, high wear resistance and good toughness. Other materials can also be selected according to the requirements of processing and actual use, and reasonably matched with the gear 1.

[0040] When assembling the torque transmission device of this embodiment, first tighten the inner surface of the annular groove 11 on the gear 1. With the inner surface of the reinforcement ring 3 Interference connection, and hot-fit, then the center hole of gear 1 (aperture ) and intermediate shaft 2 (outer diameter ) interference fit and hot-fit, and finally weld the connection between the transmission end of the intermediate shaft 2 on both sides of the gear 1. In actual use, the corresponding welding method can be selected according to needs. Therefore, the torque transmission of the auxiliary box intermediate shaft is completed by the interference fit of the intermediate shaft 2 and the gear 1, the interference fit of the reinforcing ring 3 and the gear 1, and the welding connection of the intermediate shaft 2 and the gear 1. The material of the reinforcing ring 3 can be different from that of the gear 1 and has small thermal deformation (the material of the gear 1 and the intermediate shaft 2 is 8620, and the material of the reinforcing ring 3 is GCr15), which more effectively improves the torque transmission capacity of the intermediate shaft 2 and the transmission auxiliary box, and further improves the power density and overall performance of the heavy-duty transmission of commercial vehicles.

[0041] The torque transmission device of this embodiment increases the interference by adding the reinforcing ring 3 and the corresponding assembly relationship, and fully meets the relative phase requirements without increasing the difficulty, thereby improving the torque transmission power of the double intermediate shafts. In addition, the increase in the gear heat installation temperature will cause tempering and reduce the strength, while the reinforcing ring 3 does not require a relative phase, and can be installed by heat installation + press installation, and the heat installation temperature can be greatly increased compared to the gear, so the installation process is more convenient and flexible.

[0042] Embodiment 2

[0043] The difference between this embodiment and the first embodiment is that the reinforced torque transmission device of the transmission auxiliary box intermediate shaft provided in this embodiment includes a plurality of coaxial and sequentially sleeved reinforcing rings 3; wherein, the plurality of sequentially sleeved reinforcing rings 3 are located in the annular groove 11 on the side of the gear 1 close to the intermediate shaft 2, and are coaxial with the axis of the center hole of the gear 1; the axial thickness of each reinforcing ring 3 is adapted to the groove depth of the annular groove 11. The groove wall of the annular groove 11 close to the intermediate shaft 2 is defined as the inner annular surface, and the groove wall away from the intermediate shaft 2 is defined as the outer annular surface, wherein the inner annular surface of the innermost reinforcing ring 3 is adapted to the inner annular surface size of the annular groove 11, and a gap is provided between the outer annular surface of the outermost reinforcing ring 3 and the outer annular surface of the annular groove 11, and the gap is generally ≥0.5mm, and sufficient installation gap can also be reserved according to actual installation requirements.

[0044] Based on the above embodiments, ordinary technicians are sufficient to implement the content of the utility model. Within the framework of the claims, any improvement based on the idea of ​​the utility model is deemed to fall within the protection scope of the utility model.

Claims

1. A reinforced torque transmission device for the intermediate shaft of a transmission auxiliary box, characterized in that: It comprises an intermediate shaft (2), a gear (1) and a reinforcing ring (3); One end of the intermediate shaft (2) is a driving end for connecting to a driving motor, and the other end is a transmission end; The gear (1) is provided with a center hole along the axial direction, and the transmission end of the intermediate shaft (2) passes through the center hole of the gear (1) and is connected to the gear (1); The reinforcing ring (3) is located in the annular groove (11) on the side of the gear (1) close to the intermediate shaft (2), and is coaxial with the axis of the central hole of the gear (1); the axial thickness of the reinforcing ring (3) is matched with the groove depth of the annular groove (11); the groove wall on the side of the annular groove (11) close to the intermediate shaft (2) is defined as the inner annular surface, and the groove wall on the side away from the intermediate shaft (2) is defined as the outer annular surface; the inner annular surface of the reinforcing ring (3) is matched with the inner annular surface of the annular groove (11) in size; gaps are respectively provided between the outer annular surface of the reinforcing ring (3) and the outer annular surface of the annular groove (11), and between the reinforcing ring (3) and the groove bottom of the annular groove (11).

2. The enhanced torque transmission device of the auxiliary box intermediate shaft of the transmission according to claim 1 is characterized in that: The inner ring surface of the reinforcement ring (3) and the inner ring surface of the annular groove (11) are interference connected.

3. The enhanced torque transmission device of the auxiliary box intermediate shaft of the transmission according to claim 1 or 2, characterized in that: The gap between the outer ring surface of the reinforcement ring (3) and the outer ring surface of the annular groove (11) is ≥0.5 mm, and the gap between the reinforcement ring (3) and the bottom of the annular groove (11) is ≥0.2 mm.

4. The enhanced torque transmission device of the auxiliary box intermediate shaft of the transmission according to claim 3 is characterized in that: The material of the reinforcement ring (3) is GCr15.

5. The enhanced torque transmission device of the auxiliary box intermediate shaft of the transmission according to claim 4 is characterized in that: The transmission end of the intermediate shaft (2) passes through the center hole of the gear (1) and is interference-connected with the gear (1), and the connection with both sides of the gear (1) is fixed by welding.

6. A reinforced torque transmission device for the intermediate shaft of a transmission auxiliary box, characterized in that: It comprises an intermediate shaft (2), a gear (1) and a plurality of coaxial reinforcing rings (3) which are sleeved in sequence; One end of the intermediate shaft (2) is a driving end for connecting to a driving motor, and the other end is a transmission end; The gear (1) is provided with a center hole along the axial direction, and the transmission end of the intermediate shaft (2) passes through the center hole of the gear (1) and is connected to the gear (1); A plurality of reinforcing rings (3) which are sleeved in sequence are located in an annular groove (11) on the side of the gear (1) close to the intermediate shaft (2) and are coaxial with the axis of the central hole of the gear (1); the axial thickness of each reinforcing ring (3) is matched with the groove depth of the annular groove (11); the groove wall on the side of the annular groove (11) close to the intermediate shaft (2) is defined as the inner annular surface, and the groove wall on the side away from the intermediate shaft (2) is defined as the outer annular surface, wherein the inner annular surface of the innermost reinforcing ring (3) is matched with the inner annular surface size of the annular groove (11), and gaps are respectively provided between the outer annular surface of the outermost reinforcing ring (3) and the outer annular surface of the annular groove (11), and between the reinforcing ring (3) and the groove bottom of the annular groove (11).

7. The enhanced torque transmission device of the auxiliary box intermediate shaft of the transmission according to claim 6 is characterized in that: The inner ring surface of the innermost reinforcement ring (3) and the inner ring surface of the annular groove (11), as well as the respective reinforcement rings (3), are all interference connected.

8. The enhanced torque transmission device for the auxiliary box intermediate shaft of the transmission according to claim 6 or 7, characterized in that: The gap between the outer ring surface of the outermost reinforcement ring (3) and the outer ring surface of the annular groove (11) is ≥0.5 mm, and the gap between each reinforcement ring (3) and the bottom of the annular groove (11) is ≥0.2 mm.

Images