Double-steering-arm shaft type heavy truck electric recirculating ball steering gear

Abstract

The utility model relates to the technical field of automobile steering devices, and particularly discloses a double-steering-arm shaft type heavy truck electric recirculating ball steering device which comprises a shell, a steering screw is installed in the shell through a positioning piece, a steering nut is arranged in the shell in a sliding mode, and the steering screw is in threaded connection with the steering nut. A driving steering arm shaft and a driven steering arm shaft are rotationally connected to the shell, and the driving steering arm shaft and the driven steering arm shaft are in transmission connection with the nut. According to the double-steering-arm-shaft type heavy truck electric recirculating ball steering gear, a double-steering-arm-shaft structure is adopted, the diameter of the steering screw does not need to be increased to resist radial force, the steering nut and the steel ball can be synchronously reduced, the double-steering-arm-shaft type heavy truck electric recirculating ball steering gear only needs to use a standard angular contact ball bearing, development of a non-standard bearing does not need to be considered, and the cost is reduced. The double-steering-arm shaft type heavy truck electric recirculating ball steering gear only needs to ensure that a gap exists between the shell and the steering nut, and the machining precision requirement is low.

Description

Technical Field

[0001] This utility model relates to the field of automotive steering technology, specifically a double-steering-arm axle type electric recirculating ball steering system for heavy-duty trucks. Background Technology

[0002] In recent years, with the rapid development of my country's automobile industry and the rapid promotion of electric vehicles, end users of automobiles now have higher requirements for the driving comfort of the entire vehicle, especially for the electrification and intelligence of commercial vehicles. This poses a new challenge to traditional commercial vehicle parts suppliers. Commercial vehicle steering systems generally use electronic control systems for operation, with recirculating ball steering gears performing steering actions. A recirculating ball steering gear consists of a steering screw and nut assembly plus a steering arm shaft structure.

[0003] Recirculating ball steering systems, typically used in heavy-duty trucks, need to transmit a massive torque of approximately 8000 Nm. The steering arm shaft exerts a large radial force on the steering screw nut assembly and the internal steel balls from one direction, making its working environment extremely harsh and affecting the steering system's performance and durability.

[0004] Based on the above, a double-steering-arm axle type electric recirculating ball steering system for heavy-duty trucks is proposed to solve the problems affecting the performance and durability of the steering system. Utility Model Content

[0005] The purpose of this invention is to provide a double-steering-arm axle type electric recirculating ball steering system for heavy-duty trucks to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a double steering arm shaft type electric recirculating ball steering gear for heavy trucks, including a housing, a steering screw installed inside the housing through a positioning component, and a steering nut slidably disposed inside the housing, with the steering screw threadedly connected to the steering nut; and an active steering arm shaft and a driven steering arm shaft rotatably connected to the housing, with the active steering arm shaft and the driven steering arm shaft being drively connected to the nut.

[0007] Furthermore, racks are provided on both the upper and lower sides of the steering nut, and gears are installed on both the active steering arm shaft and the driven steering arm shaft, with the two gears meshing on both sides of the rack respectively.

[0008] Furthermore, the positioning element includes an upper clamping plug and a lower clamping plug mounted on the housing, and the steering screw is installed between the upper clamping plug and the lower clamping plug.

[0009] Furthermore, a positioning bearing is installed inside the housing, and the steering screw is installed inside the positioning bearing.

[0010] Furthermore, a conduit is installed on the steering nut.

[0011] Furthermore, the conduit is mounted on the steering nut by a clamp, and the clamp is connected to the steering nut by a positioning part.

[0012] Furthermore, the positioning part includes a screw that passes through the clamp and is mounted on the steering nut.

[0013] Furthermore, a washer is provided between the screw and the clamp.

[0014] Furthermore, an adjusting screw is installed inside the housing, and the steering screw is installed inside the adjusting screw.

[0015] Furthermore, a sealing ring is provided between the upper clamping screw and the adjusting screw;

[0016] Furthermore, an O-ring is provided between the upper clamping screw and the adjusting screw.

[0017] Furthermore, eccentric bearings are provided between the active steering arm shaft and the driven steering arm shaft and the housing.

[0018] Furthermore, a retaining ring is provided between each of the eccentric bearings and the housing.

[0019] Furthermore, each of the eccentric bearings is equipped with a bearing retainer ring.

[0020] Compared with the prior art, the beneficial effects of this utility model are:

[0021] 1. Traditional electric recirculating ball steering systems are bulky and heavy. To resist the radial force applied by the steering arm shaft, it is necessary to increase the diameter of the steering screw, increase the volume of the steering nut, and use large steel balls to prevent the steering screw from breaking or the steel balls from being crushed during operation, which could lead to the failure of the ball screw pair. Therefore, compared with existing technologies, the double steering arm shaft type electric recirculating ball steering system for heavy-duty trucks adopts a double steering arm shaft structure. The diameter of the steering screw does not need to be increased to resist the radial force, and the steering nut and steel balls can also be reduced simultaneously, greatly reducing the weight of the steering system and lowering costs.

[0022] 2. The selection of bearings at both ends of the screw in traditional electric recirculating ball steering gear is difficult because the bearings must bear a large amount of axial force and also take into account the unbalanced force applied by the steering arm shaft. This requires increasing the size and optimizing the materials. Therefore, compared with the existing technology, the double steering arm shaft type electric recirculating ball steering gear for heavy trucks only needs to use standard angular contact ball bearings, without the need to develop non-standard bearings, thus reducing mold costs.

[0023] 3. Traditional electric recirculating ball steering gears have relatively high machining difficulty in the outer diameter of the housing and steering nut. The inner cavity of the housing needs to be rolled with high precision, and the steering nut that mates with it must also ensure precision to prevent jamming. Therefore, compared with the existing technology, the double steering arm axle type electric recirculating ball steering gear for heavy trucks only needs to ensure that there is a gap between the housing and the steering nut, which has lower machining precision requirements and reduces machining costs. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings.

[0025] Figure 1 A schematic diagram of the overall structure provided for an embodiment of this utility model;

[0026] Figure 2 for Figure 1 Schematic diagram of the structure in sectional view along the AA section;

[0027] Figure 3 for Figure 1 Schematic diagram of the cross-sectional structure along the middle BB line.

[0028] Explanation of reference numerals in the attached drawings: 1. Housing; 2. Adjusting plug; 3. O-ring; 4. Sealing ring; 5. Upper clamping plug; 6. Positioning bearing; 7. Steering screw; 8. Steering nut; 9. Guide tube; 10. Clamp; 11. Screw; 12. Washer; 13. Lower clamping plug; 14. Driven steering arm shaft; 15. Eccentric bearing; 16. Snap ring; 17. Driven steering arm shaft; 18. Bearing retainer ring; 19. Gear; 20. Rack. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0030] Please see Figures 1-3This utility model provides a technical solution: a double steering arm shaft type electric recirculating ball steering gear for heavy trucks, including a housing 1, a steering screw 7 installed inside the housing 1 through a positioning component, and a steering nut 8 slidably disposed inside the housing 1, with the steering screw 7 and the steering nut 8 threadedly connected; and an active steering arm shaft 14 and a driven steering arm shaft 17 are rotatably connected to the housing 1, and the active steering arm shaft 14 and the driven steering arm shaft 17 are drively connected to the nut.

[0031] Specifically, this dual-steering-arm shaft type electric recirculating ball steering gear for heavy-duty trucks includes a housing 1. A steering screw 7 is mounted inside the housing 1 via a positioning component, and a steering nut 8 is slidably disposed inside the housing 1. The steering screw 7 and the steering nut 8 are threadedly connected; that is, when the steering screw 7 rotates, it causes the steering nut 8 to slide. A driving steering arm shaft 14 and a driven steering arm shaft 17 are rotatably connected to the housing 1. Specifically, this dual-steering-arm shaft type electric recirculating ball steering gear for heavy-duty trucks includes a driving steering arm shaft 14 and a driven steering arm shaft 17 rotatably connected to the housing, and both are drive-connected to the nut. Therefore, when the steering screw 7 rotates, it causes the steering nut 8 to slide within the housing 1. At this moment, the driving steering arm shaft 14 applies a large radial force to the ball screw drive pair, while the driven steering arm shaft 17 balances and counteracts this force, greatly optimizing the working environment of the ball screw drive pair, thus improving the performance and durability of the steering system.

[0032] In the embodiments provided by this utility model, racks 20 are provided on both the upper and lower sides of the steering nut 8, and gears 19 are installed on both the active steering arm shaft 14 and the driven steering arm shaft 17. The two gears 19 mesh with the two sides of the rack 20 respectively. Therefore, when the steering nut 8 slides, the active steering arm shaft 14 and the driven steering arm shaft 17 will rotate through the cooperation of the rack 20 and the gears 19, thus improving the performance and durability of the steering system.

[0033] In the embodiments provided by this utility model, the positioning component includes an upper clamping screw plug 5 and a lower clamping screw plug 13 installed on the housing 1. The steering screw 7 is installed between the upper clamping screw plug 5 and the lower clamping screw plug 13 so that the steering screw 7 is installed in a predetermined position, thereby improving the stability of the steering screw 7 during installation.

[0034] In the embodiments provided by this utility model, a positioning bearing 6 is installed inside the housing 1, and the steering screw 7 is installed inside the positioning bearing 6, which can improve the stability of the steering screw 7 during installation and effectively reduce the friction when the steering screw 7 rotates, resulting in better performance.

[0035] In the embodiments provided by this utility model, a guide tube 9 is installed on the steering nut 8. Specifically, the guide tube 9 is generally connected to the threaded track inside the nut, forming a closed circulation channel. The function of the guide tube 9 is to guide the steel ball from one end of the threaded track of the nut and then guide it back to the other end, forming a continuous rolling cycle, reducing friction and improving transmission efficiency.

[0036] In the embodiments provided by this utility model, the conduit 9 is mounted on the steering nut 8 by a clamp 10. The clamp 10 is connected to the steering nut 8 through a positioning part, which can further improve the stability of the conduit 9 during installation.

[0037] In the embodiment provided by this utility model, the positioning part includes a screw 11, which passes through the clamp 10 and is installed on the steering nut 8. A washer 12 is also provided between the screw 11 and the clamp 10. At this time, the guide tube 9 can be fixed after the screw 11 fixes the clamp 10. The washer 12 reduces the pressure of the screw 11 on the surface of the steering nut 8 by increasing the contact area.

[0038] In the embodiments provided by this utility model, an adjusting screw 2 is installed inside the housing 1, and a steering screw 7 is installed inside the adjusting screw 2 to adjust the preload between the internal components of the steering gear, thereby ensuring the smoothness, accuracy and safety of the steering operation.

[0039] In the embodiments provided by this utility model, a sealing ring 4 is provided between the upper clamping screw plug 5 and the adjusting screw plug 2 to achieve a sealing effect, and the sealing ring 4 has a good wear resistance effect.

[0040] In the embodiments provided by this utility model, an O-ring 3 is provided between the upper clamping screw 5 and the adjusting screw 2, which can improve the stability between the upper clamping screw 5 and the adjusting screw 2. More specifically, the O-ring 3 is provided between the sealing ring 4 and the adjusting screw 2 to prevent liquid or gas leakage.

[0041] In the embodiments provided by this utility model, an eccentric bearing 15 is provided between the active steering arm shaft 14 and the driven steering arm shaft 17 and the housing 1. By adjusting the deflection angle of the eccentric bearing 15, an appropriate preload can be applied to the gear 19 or the bearing to balance the transmission efficiency and friction, and avoid excessive clearance (leading to looseness) or insufficient clearance (leading to jamming).

[0042] In the embodiments provided by this utility model, each eccentric bearing 15 is provided with a retaining ring 16 between it and the housing 1. Specifically, the main function of the retaining ring 16 inside the steering arm shaft is to position and fix the eccentric bearing 15, ensuring that the relevant components maintain a stable position in the axial direction and preventing them from being displaced or falling off due to vibration, impact or force during movement.

[0043] In the embodiments provided by this utility model, each eccentric bearing 15 is equipped with a bearing retainer ring 18. The bearing retainer ring 18 is installed in the shaft groove of the steering arm shaft to fix the bearing, gear 19 or other rotating components, preventing them from shifting axially due to vibration, impact or load changes, and ensuring that the components are always in the designed position. By fixing the bearing position, the bearing retainer ring 18 maintains the precise fit of the gear pair 19 and avoids abnormal noise or wear caused by displacement.

[0044] It should be noted that all electrical equipment involved in this application can be powered by batteries or external power sources.

[0045] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," and "connected," etc., should be interpreted broadly. For example, "connected" 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 a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0046] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A double-steering-arm axle type electric recirculating ball steering system for heavy-duty trucks, comprising a housing (1), characterized in that: A steering screw (7) is installed inside the housing (1) through a positioning component, and a steering nut (8) is slidably disposed inside the housing (1). The steering screw (7) and the steering nut (8) are threadedly connected. Furthermore, the housing (1) is rotatably connected to the active steering arm shaft (14) and the driven steering arm shaft (17); The active steering arm shaft (14) and the driven steering arm shaft (17) are connected to the nut drive.

2. The double-steering-arm axle type electric recirculating ball steering system for heavy-duty trucks according to claim 1, characterized in that: The steering nut (8) is provided with racks (20) on both the upper and lower sides. The active steering arm shaft (14) and the driven steering arm shaft (17) are both equipped with gears (19), and the two gears (19) mesh on both sides of the rack (20).

3. The double-steering-arm axle type electric recirculating ball steering system for heavy-duty trucks according to claim 1, characterized in that: The positioning element includes an upper clamping screw plug (5) and a lower clamping screw plug (13) mounted on the housing (1), and the steering screw (7) is mounted between the upper clamping screw plug (5) and the lower clamping screw plug (13).

4. The double-steering-arm axle type electric recirculating ball steering system for heavy-duty trucks according to claim 3, characterized in that: The housing (1) is equipped with a positioning bearing (6), and the steering screw (7) is installed inside the positioning bearing (6).

5. A double-steering-arm axle type electric recirculating ball steering system for heavy-duty trucks according to claim 2, characterized in that: A conduit (9) is installed on the steering nut (8).

6. A double-steering-arm axle type electric recirculating ball steering system for heavy-duty trucks according to claim 5, characterized in that: The conduit (9) is mounted on the steering nut (8) by a clamp (10), and the clamp (10) is connected to the steering nut (8) by a positioning part.

7. A double-steering-arm axle type electric recirculating ball steering system for heavy-duty trucks according to claim 6, characterized in that: The positioning part includes a screw (11), which passes through the clamp (10) and is mounted on the steering nut (8).

8. A double-steering-arm axle type electric recirculating ball steering system for heavy-duty trucks according to claim 7, characterized in that: A washer (12) is also provided between the screw (11) and the clamp (10).

9. A double-steering-arm axle type electric recirculating ball steering system for heavy-duty trucks according to claim 4, characterized in that: An adjusting screw plug (2) is installed inside the housing (1), and the steering screw (7) is installed inside the adjusting screw plug (2).

10. A double-steering-arm axle type electric recirculating ball steering system for heavy-duty trucks according to claim 9, characterized in that: A sealing ring (4) is provided between the upper clamping screw (5) and the adjusting screw (2).

11. A double-steering-arm axle type electric recirculating ball steering system for heavy-duty trucks according to claim 9, characterized in that: An O-ring (3) is provided between the upper clamping screw (5) and the adjusting screw (2).

12. A double-steering-arm axle type electric recirculating ball steering system for heavy-duty trucks according to claim 1, characterized in that: An eccentric bearing (15) is provided between the active steering arm shaft (14) and the driven steering arm shaft (17) and the housing (1).

13. A double-steering-arm axle type electric recirculating ball steering system for heavy-duty trucks according to claim 12, characterized in that: Each of the eccentric bearings (15) is provided with a retaining ring (16) between itself and the housing (1).

14. A double-steering-arm axle type electric recirculating ball steering system for heavy-duty trucks according to claim 13, characterized in that: Each of the eccentric bearings (15) is equipped with a bearing retainer (18).

Images