Gearbox gear shaft bearing

Abstract

A gearbox gear shaft bearing comprises an outer ring, a gear shaft, a rolling body and a retainer used for being sleeved with the rolling body, a roller path part is integrally arranged on the gear shaft in a protruding mode in the radial direction, and roller paths matched with each other are arranged on the outer ring and the roller path part respectively and used for allowing the rolling body to run in the roller paths. An abutting part and a gear are arranged on the two sides of the roller path part in the axial direction respectively, and the gear abuts against the end face of one side of the roller path part in the axial direction. The bearing has the beneficial effects that friction and abrasion of the bearing in the operation process can be obviously reduced by eliminating the arrangement of the inner ring, and the wriggling phenomenon possibly occurring during high-speed operation of the inner ring is effectively avoided, so that the service life of the bearing is prolonged, and the operation efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of bearings, in particular to a kind of gearbox gear shaft bearing. BACKGROUND

[0002] Fixed gear ratio gearbox is widely used in new energy electric vehicles, which converts the high-speed low-torque generated by the motor into the low-speed high-torque required by the wheels through a single gear ratio. This design simplifies the transmission system, reduces internal friction and energy loss, and improves overall efficiency. Due to the wide range of torque output of electric vehicle motors, fixed gear ratio gearbox can meet the needs from starting acceleration to high-speed cruising without complex gear shifting mechanism, making driving more smooth, while reducing vehicle maintenance costs and complexity.

[0003] However, with the development of new energy electric vehicles, gearbox bearings are facing more and more challenges. With the continuous improvement of motor input torque, the requirement of bearing anti-creep is improved. Among them, the problem of bearing anti-creep is the focus of attention of each host manufacturer. The existing solution to bearing creep is mainly to increase the interference between the bearing inner ring and the shaft. This scheme has certain effect, but blindly increasing the interference is not conducive to installation, and will generate increased ring stress, which may cause the fracture of the ring. SUMMARY

[0004] In view of the deficiencies of the prior art, the utility model provides a gearbox gear shaft bearing for preventing the inner ring of the bearing from creeping.

[0005] To achieve the above-mentioned purpose, the technical scheme of the utility model is as follows: a gearbox gear shaft bearing, comprising an outer ring, a gear shaft, rolling elements and a retainer for sleeving the rolling elements, the gear shaft is integrally provided with a raceway portion protruding radially, the outer ring and the raceway portion are respectively provided with raceways matched for the rolling elements to run therein, the two sides of the raceway portion along the axial direction are respectively provided with abutting portions and gears, and the gears abut on the end face of one side of the raceway portion along the axial direction.

[0006] The utility model has the advantages that: first, the cancellation of the inner ring can significantly reduce the friction and wear of the bearing during operation, effectively avoiding the creeping phenomenon that may occur during high-speed operation of the inner ring, thereby prolonging the service life of the bearing and improving the operation efficiency. Second, by setting the abutting portions, axial positioning is formed with the remaining parts of the gearbox, which enhances the stability of the bearing assembly, reduces the axial displacement, and ensures that the gear shaft can maintain accurate position under various working conditions. In addition, the direct abutting design of the gear and the raceway portion not only enhances the operation consistency between the two, but also helps to reduce the gap between the gear and the bearing, improves the transmission efficiency and the response speed of the gear. Overall, this design shows significant advantages in improving bearing performance, reducing maintenance costs and enhancing reliability.

[0007] Further, the raceway portion is provided with a fixing member on the end face thereof abutting against the gear in the direction of the gear, and the gear is provided with a corresponding fixing hole corresponding to the fixing member, and the fixing member and the fixing hole are matched to enhance the connection between the gear and the raceway portion.

[0008] The further optimization of the gearbox gear shaft bearing design lies in the connection between the raceway portion and the gear. By providing a fixing member on the end face of the raceway portion in the direction of the gear, and a fixing hole on the corresponding position of the gear, the fixing member and the fixing hole can be precisely matched, thereby significantly enhancing the connection strength and stability between the gear and the raceway portion. This reinforced connection not only improves the overall rigidity of the bearing assembly, reduces the risk of deformation under high load or impact conditions, but also helps to maintain the precise alignment between the gear and the raceway portion, ensuring smoothness and accuracy during transmission. In addition, this fixing method simplifies the assembly process, reduces the time and cost required for assembly, and improves the reliability and durability of the assembly, so that the bearing can maintain high performance in long-term operation, reducing the need for maintenance and replacement due to loose or failed connections.

[0009] Further, one end of the fixing member away from the end face of the raceway portion abutting against the gear is provided with a radially distributed elastic fixing member, an elastic member and a placement slot, the elastic member is located in the placement slot and its two ends are respectively fixed on the bottom of the placement slot and one end of the elastic fixing member; the gear is provided with an auxiliary positioning hole corresponding to the elastic fixing member, the auxiliary positioning hole is inclinedly arranged towards the bottom of the fixing hole, and the inclination arrangement makes the elastic fixing member gradually extend when moving along the auxiliary positioning hole towards the bottom of the fixing hole.

[0010] This gearbox gear shaft bearing design realizes a self-adaptive elastic connection mechanism by providing an elastic fixing member and an elastic member on the fixing member, and an inclined auxiliary positioning hole on the gear. This design not only improves the connection stability between the gear and the raceway portion, reduces the risk of damage caused by vibration and impact, but also simplifies the assembly process, so that the elastic fixing member can automatically adjust its position along the inclined auxiliary positioning hole, ensuring precise alignment. In addition, the pre-tightening force of the elastic member helps to reduce the vibration and noise of the gear during operation, improve the load capacity and service life of the bearing, and the inclined auxiliary positioning hole design enables the elastic fixing member to gradually extend during assembly, further enhancing the connection strength between the gear and the raceway portion, ensuring high performance and reliability of the bearing in long-term operation.

[0011] Further, the fixing member and the fixing hole are respectively circumferentially arranged on the end face of the raceway portion and the gear abutting against each other, and the elastic fixing member, the elastic member, the placement slot and the auxiliary positioning hole are respectively symmetrically arranged on both sides of the fixing member and the fixing hole.

[0012] The design of the gearbox gear shaft bearing achieves balanced stress and symmetrical stability of the bearing assembly by uniformly arranging multiple fixing members and fixing holes on the end surface where the raceway part and the gear abut, and symmetrically configuring elastic fixing members, elastic members, placement grooves, and auxiliary positioning holes on both sides of the fixing members and fixing holes. This symmetrical layout not only enhances the overall rigidity and load-carrying capacity of the bearing, but also helps to reduce deformation and wear caused by uneven stress, thereby prolonging the service life of the bearing. At the same time, the symmetrically arranged elastic fixing members and auxiliary positioning holes provide better centering and self-positioning capability during assembly, simplifying the assembly process and improving assembly efficiency and accuracy. In addition, this design helps to maintain precise fit between the gear and the raceway part under high load or impact conditions, ensuring smooth and reliable transmission, further enhancing the performance and durability of the bearing. BRIEF DESCRIPTION OF DRAWINGS

[0013] Fig. 1 A schematic diagram of the gearbox after the embodiment of the present application is installed;

[0014] Fig. 2 A cross-sectional view of the embodiment of the present application;

[0015] Fig. 3 A partial cross-sectional view of the fixing member and the fixing hole of the embodiment of the present application. DETAILED DESCRIPTION

[0016] The gearbox gear shaft bearing of the embodiment of the present application is as shown in the figure: Figs. 1-3 It includes an outer ring 1, a gear shaft 2, rolling elements 3, and a retainer 4 for housing the rolling elements 3. The gear shaft 2 has a raceway part 21 protruding radially and integrally arranged on it. The outer ring 1 and the raceway part 21 are respectively provided with raceways 6 that cooperate to allow the rolling elements 3 to run within them.

[0017] The raceway part 21 is provided with an abutting part 22 and a gear 5 on two sides in the axial direction, and the gear 5 abuts on the end face of the raceway part 21 in the axial direction. The two end faces of the raceway part 21 and the gear 5 are provided with a plurality of matched fixing parts 23 and fixing holes 51 in the circumferential direction, respectively, two groups of elastic fixing parts 231, elastic parts 232 and placing grooves 233 are symmetrically arranged on the end of each fixing part 23 away from the end face of the raceway part 21 abutting on the gear 5, the elastic part 232 is located in the placing groove 233 and its two ends are fixed on the bottom of the placing groove 233 and one end of the elastic fixing part 231 respectively to make the elastic fixing part 231 have a tendency to move away from the placing groove 233. In each fixing hole 51, two groups of elastic fixing parts 231, elastic parts 232 and placing grooves 233 are also provided with symmetrically arranged auxiliary positioning holes 511, the auxiliary positioning hole 511 is inclined to the bottom of the fixing hole 51 and the inclination makes the elastic fixing part 231 gradually in the extended state when moving in the auxiliary positioning hole 511 towards the bottom of the fixing hole 51, and the positioning groove 512 is arranged at the end of the auxiliary positioning hole 511, i.e. the bottom of the fixing hole 51, to make the elastic fixing part 231 in the fully extended state, the depth of the positioning groove 513 is at least half of the radial distance between the two ends of the auxiliary positioning hole 511 and more, and a step is formed at the connection with the auxiliary positioning hole 511, which is used to prevent the elastic fixing part 231 from backtracking, thereby preventing the gear 5 and the raceway part 21 from being separated.

[0018] The above embodiment is only one of the preferred specific embodiments of the present application, and the usual changes and replacements made by those skilled in the art within the technical scheme of the present application are all included in the protection scope of the present application.

Claims

1. A gearbox pinion shaft bearing, characterized by: The application relates to a bearing assembly comprising an outer ring, a gear shaft, rolling elements and a cage for sleeving the rolling elements, wherein the gear shaft is integrally provided with a raceway portion protruding radially, the outer ring and the raceway portion are respectively provided with raceways matched for the rolling elements to run therein, and the raceway portion is respectively provided with an abutting portion and a gear on two axial sides.

2. The gearbox pinion shaft bearing of claim 1, wherein: The raceway portion is provided with a fixing member towards the gear direction from an end surface abutting against the gear, the gear is provided with a corresponding fixing hole corresponding to the fixing member, and the fixing member and the fixing hole are matched for enhancing the connection between the gear and the raceway portion.

3. A gearbox pinion shaft bearing according to claim 2, characterised in that: One end of the fixing member away from the end surface abutting against the gear is provided with a radially distributed elastic fixing member, an elastic member and a placing groove, the elastic member is located in the placing groove and two ends of the elastic member are respectively fixed to one end of the elastic fixing member and the bottom of the placing groove, the gear is provided with an auxiliary positioning hole corresponding to the elastic fixing member, the auxiliary positioning hole is obliquely arranged towards the bottom of the fixing hole, and the oblique arrangement makes the elastic fixing member gradually present an extended state when moving towards the bottom of the fixing hole along the auxiliary positioning hole.

4. A gearbox pinion shaft bearing according to claim 3, characterised in that: The fixing member and the fixing hole are respectively circumferentially arranged on the end surfaces abutting against each other, a plurality of the elastic fixing members, the elastic members, the placing grooves and the auxiliary positioning holes are respectively arranged on two sides of the fixing member and the fixing hole.

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