Four-point contact ball bearing for nut lead screw of heavy-load electric truck
By designing four-point contact ball bearings in circulating ball steering bearings, using channel and spacer structures, the problems of insufficient rigidity and serious wear of traditional bearings under heavy load conditions are solved, and higher axial rigidity and load-bearing capacity are achieved, extending service life and reducing noise.
Patent Information
- Application Number
- CN202422030416.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-21
- Publication Date
- 2025-05-27
- Estimated Expiration
- 2034-08-21
AI Technical Summary
Traditional circulating ball steering bearings have problems such as insufficient rigidity, severe wear, loose internal components, short service life and low power density under heavy load conditions, which limit performance improvement.
A four-point contact ball bearing for heavy-duty electric truck nut screw was designed. By setting channels in the inner and outer rings of the bearing, the addition of spacers to replace the traditional cage, fill with more rolling elements, and adopting a large contact angle design to enhance the axial rigidity and load-bearing capacity of the bearing.
It significantly improves the axial rigidity and load-bearing capacity of the bearing, reduces noise, and improves the stability and service life of the steering gear.
Smart Images
Figure CN222910538U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of bearings, and in particular to a four-point contact ball bearing for a nut screw of a heavy-duty electric truck. Background Art
[0002] As the core component of the steering system, the recirculating ball steering gear is particularly important in the steering devices of automobiles, ships and aircraft. With the recirculating ball steering gear, the driver or operator can control the steering operation more flexibly and accurately.
[0003] The recirculating ball steering gear is based on the working principle of the recirculating ball and is mainly composed of a steering screw, a nut, a transmission pair and a steering gear housing, etc. Among them, the steering screw, bearing and nut are the core components of the steering gear, and the steering torque is transmitted through the relative rotation between them. The transmission pair is responsible for converting the rotation of the steering screw into the deflection of the steering component, thereby achieving steering. Its performance is directly related to the vehicle's handling stability and driving safety.
[0004] Conventional recirculating ball steering bearing components (such as attached Figure 6 As shown in the figure, a is the outer ring of the bearing, b is the inner ring of the bearing, c is the rolling element, and d is the cage) there are certain problems in the structural design and performance. Since the steering gear is mainly subjected to axial load during operation, especially the axial load of large steering gears is greater, the internal stress is obvious, and the steering gear bearing has significant problems, such as insufficient rigidity, severe wear, disintegration of internal components, short service life, low power density, etc. These problems limit the improvement of the performance of the recirculating ball steering gear. Therefore, it is necessary to improve the design of the recirculating ball steering gear bearing components to improve their service life and performance. Utility Model Content
[0005] The content of this application is used to introduce concepts in a brief form, which will be described in detail in the detailed implementation section below. The content of this application is not intended to identify the key features or essential features of the technical solution claimed for protection, nor is it intended to limit the scope of the technical solution claimed for protection.
[0006] In order to solve the technical problems mentioned in the above background technology section, some embodiments of the present application provide a four-point contact ball bearing for a nut screw of a heavy-duty electric truck, comprising:
[0007] The bearing outer ring has an outer ring groove on the inner wall;
[0008] The inner ring of the bearing has an inner ring groove on its outer wall;
[0009] The rolling elements are multiple and are arranged in the groove formed by the inner ring groove and the outer ring groove;
[0010] The spacer is disposed between adjacent rolling elements, evenly distributing the rolling elements in the raceway;
[0011] Oil grooves for storing grease are formed at both ends of the spacer.
[0012] In this application, the spacer replaces the cage. Compared with the traditional bearing design, more rolling elements can be filled, with more contact area. And during production, the inner ring of the bearing can be ground for mating, increasing rigidity. Compared with the errors caused by increasing the large contact angle structure design and the cumulative tolerances of components at the installation site, the axial rigidity and load-bearing capacity of the bearing can be significantly and accurately improved, the noise can be reduced, and the steering gear can obtain better stability.
[0013] Furthermore, both the outer raceway and the inner raceway are peach-shaped raceways formed by arcs; the peach-shaped raceway includes two symmetrically arranged rolling contact parts that contact the rolling elements, and a gap part located between the two rolling contact parts.
[0014] Furthermore, the bearing inner ring is composed of two symmetrically arranged first inner rings and second inner rings.
[0015] Furthermore, an arc surface that fits the rolling elements is formed on the spacer, and the oil grooves are formed on the arc surface.
[0016] Furthermore, the length of the spacer along the radial direction of the bearing inner ring is less than the distance between the bearing inner ring and the bearing outer ring.
[0017] Furthermore, the spacer is of a block or plate structure.
[0018] The beneficial effect of this application is that it provides a four-point contact ball bearing for a heavy-duty electric truck nut screw rod with increased rigidity. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] The drawings constituting a part of this application are used to provide a further understanding of this application, making other features, purposes, and advantages of this application more obvious. The schematic embodiments and descriptions of the drawings of this application are used to explain this application and do not constitute an improper limitation to this application.
[0020] In addition, throughout the drawings, the same or similar reference numerals denote the same or similar elements. It should be understood that the drawings are schematic, and the elements and elements are not necessarily drawn to scale.
[0021] In the drawings:
[0022] Figure 1 is the overall schematic diagram according to the embodiment of this application;
[0023] Figure 2 is the structural schematic diagram of a part of the embodiment, mainly showing the spacer;
[0024] Figure 3 is Figure 2 an enlarged view of part A of
[0025] Figure 4 a sectional view of the embodiment;
[0026] Figure 5 is Figure 4 an enlarged view of part B of
[0027] Figure 6 a schematic diagram of a recirculating ball steering gear bearing component of the prior art.
[0028] Reference numerals:
[0029] 1. Outer bearing ring; 2. Inner bearing ring; 3. Rolling elements; 4. Spacer; 5. Outer raceway; 6. Inner raceway; 7. Shoulder; 8. Oil groove; 9. Rolling contact part; 10. Clearance part. Detailed embodiments
[0030] Embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although some embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. On the contrary, these embodiments are provided to more thoroughly and completely understand the present disclosure. It should be understood that the accompanying drawings and embodiments of the present disclosure are only for exemplary purposes and are not used to limit the protection scope of the present disclosure.
[0031] In addition, it should be noted that for the sake of convenience of description, only parts related to the relevant invention are shown in the drawings. Without conflict, the embodiments in the present disclosure and the features in the embodiments can be combined with each other.
[0032] It should be noted that the concepts such as "first" and "second" mentioned in the present disclosure are only used to distinguish different devices, modules or units, and are not used to limit the order or mutual dependency relationship of the functions performed by these devices, modules or units.
[0033] It should be noted that the modifications of "one" and "multiple" mentioned in the present disclosure are illustrative rather than restrictive. Those skilled in the art should understand that unless otherwise clearly specified in the context, it should be understood as "one or more".
[0034] The present disclosure will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.
[0035] Refer to Figures 1-5, a four-point contact ball bearing for overloading the nut screw rod of an electric truck, comprising an outer bearing ring 1, an inner bearing ring 2, rolling elements 3, and a spacer 4; an outer raceway 5 is provided on the inner wall of the outer bearing ring 1, and an inner raceway 6 is provided on the outer wall of the inner bearing ring 2. There are several rolling elements 3 which are arranged in the raceway formed by the outer raceway 5 and the inner raceway 6. The spacer 4 is installed between adjacent rolling elements 3 to evenly separate the rolling elements 3 in the raceway. A shoulder 7 is provided on the inner bearing ring 2. In this application, the spacer 4 replaces the cage. Compared with the traditional bearing design, more rolling elements 3 can be filled, with a larger contact area. And during production, the inner bearing ring 2 can be ground for matching to increase rigidity. Compared with the error caused by increasing the large contact angle structure design and the cumulative tolerance of components at the installation site, the axial rigidity and load-bearing capacity of the bearing can be significantly and accurately improved, the noise can be reduced, and the steering gear can obtain better stability.
[0036] Both the outer bearing ring 1 and the inner bearing ring 2 are made by high-speed forging and cold rolling forming to enhance the material density and improve the strength of the material itself.
[0037] The spacer 4 is in a block or plate structure. The spacer 4 can be processed and produced using engineering materials such as PA66, PA46, PEEK, and PI according to the occasion to ensure product properties such as strength and heat resistance.
[0038] The length of the spacer 4 along the radial direction of the inner bearing ring 2 is less than the distance between the inner bearing ring 2 and the outer bearing ring 1.
[0039] Arc surfaces that fit the rolling elements 3 are provided at both ends of the spacer 4, and oil grooves 8 are provided at both ends of the spacer 4. The oil grooves 8 are located on the arc surfaces. Under the action of the oil grooves 8, the reserve lubricating grease can be increased, the lubricating ability can be improved while ensuring the strength of the spacer 4, the wear can be reduced, and the bearing life can be effectively extended. Since the rotational speed of the recirculating ball bearing is in a relatively low-speed state, it is not easy to form an oil film, and it is easy to have direct contact between the inner and outer rings and the rolling elements 3, resulting in failure. And the repetitive high-rigidity work causes uneven stress on the rolling elements 3 inside the bearing. In traditional bearings, the local cage drags some rolling elements 3 to run, and some rolling elements 3 push the cage to rotate, resulting in the bearing falling apart and serious failure between the rolling elements 3 and the raceway or even between the rolling elements 3. Therefore, the oil groove 8 is designed on the spacer 4 to store lubricating grease, which can ensure strength and enhance lubricity, is beneficial to the formation of an oil film, and can form a good partition between the rolling elements 3 to ensure the normal operation of the rolling elements 3 and improve the life of the steering gear.
[0040] In order to better obtain higher stiffness and have better stability in the case of impact, vibration, etc. after proper installation, in this application, the contact points between the rolling elements 3 and the outer raceway 5 and the inner raceway 6 are four-point contacts. Specifically, both the outer raceway 5 and the inner raceway 6 are peach-shaped raceways formed by arcs. The peach-shaped raceway includes two symmetrically arranged rolling contact parts 9 that are in contact with the rolling elements 3, and a gap part 10 located between the two rolling contact parts 9. Thus, after the bearing is properly installed, it has better stability in the case of impact, vibration, etc., has higher precision performance, is beneficial to the meshing precision of the subsequent sector gear kinematic pair, and reduces wear and noise.
[0041] In order to better withstand bidirectional axial loads, in this application, the depths of the outer raceway 5 and the inner raceway 6 are deepened, and the contact angle with the rolling elements 3 can reach 60°. Thus, on the one hand, the integrity of the shoulder part 7 of the inner ring 2 of the bearing can be retained, and on the other hand, compared with the original stress concentration, the load-bearing capacity is greatly improved, and it can withstand bidirectional axial loads.
[0042] In order to be able to fill more rolling elements 3, in this application, the inner ring 2 of the bearing is designed as a split type, which is composed of two symmetrically arranged first inner rings and second inner rings. Thus, on the one hand, more rolling elements 3 can be filled, and on the other hand, it is convenient for the installation of the rolling elements 3.
[0043] The working principle is as follows:
[0044] After the bearing outer ring 1 is fitted and installed with the bearing chamber of the converter housing, and the circulating ball body and the lead screw body are combined, by inputting an external power torque, it acts on the lead screw to drive the subsequent sector gear to operate normally. When the circulating ball steering gear works, the lead screw component rotates under the drive of the steering system, generating a large axial load. Through the above improvements, in this application, the cage structure of the traditional bearing is cancelled and replaced with a spacer 4. The inner ring 2 of the bearing is designed as a split type to fill more rolling elements 3 and adopt a large contact angle. The axial load-bearing capacity and stiffness of the bearing are further improved. When the bearing and other components such as the lead screw component are correctly fitted and installed, the stability and safety of the steering system can be effectively guaranteed.
[0045] The above description is only some preferred embodiments of the present disclosure and an explanation of the applied technical principles. Those skilled in the art should understand that the scope of the invention involved in the embodiments of the present disclosure is not limited to the technical solutions formed by the specific combination of the above technical features, and should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the above inventive concept. For example, the technical solutions formed by mutually replacing the above features with the (but not limited to) technical features with similar functions disclosed in the embodiments of the present disclosure.
Claims
1. A four-point contact ball bearing for a heavy-duty electric truck nut screw, comprising: The bearing outer ring has an outer ring groove on the inner wall; The inner ring of the bearing has an inner ring groove on its outer wall; A plurality of rolling elements arranged in the groove formed by the inner ring groove and the outer ring groove; Features: The four-point contact ball bearing for the heavy-duty electric truck nut screw also includes: A spacer, disposed between adjacent rolling elements, to evenly distribute the rolling elements in the channel; Oil grooves for storing grease are provided on both ends of the isolating member.
2. The four-point contact ball bearing for the nut screw of a heavy-duty electric truck according to claim 1, characterized in that: The outer ring groove and the inner ring groove are both peach-shaped grooves formed by circular arcs; the peach-shaped groove comprises two symmetrically arranged rolling contact parts in contact with the rolling body, and a gap part located between the two rolling contact parts.
3. The four-point contact ball bearing for the nut screw of a heavy-duty electric truck according to claim 1, characterized in that: The bearing inner ring is composed of two symmetrically arranged first inner rings and a second inner ring.
4. The four-point contact ball bearing for a heavy-duty electric truck nut screw according to claim 1, characterized in that: The isolating member is provided with an arc surface which fits with the rolling element, and the oil groove is provided on the arc surface.
5. The four-point contact ball bearing for the nut screw of a heavy-duty electric truck according to claim 1, characterized in that: The length of the isolating member along the radial direction of the bearing inner ring is smaller than the distance between the bearing inner ring and the bearing outer ring.
6. The four-point contact ball bearing for the nut screw of a heavy-duty electric truck according to claim 1, characterized in that: The isolating element is a block or plate structure.