Shock absorption and buffering mounting structure of electric power steering gear

Abstract

The utility model discloses an electric power steering gear shock absorption buffer installation structure which comprises a shell and a ball screw transmission mechanism arranged in the shell, the ball screw transmission mechanism comprises a lead screw nut and a lead screw spirally connected in the lead screw nut through a ball, and the lead screw nut is rotationally connected in the shell through a bearing. An annular installation groove is formed in the inner wall of the shell, a stopping shoulder is arranged at one axial end of the annular installation groove, a locking ring is installed at the other end of the annular installation groove, an outer ring of the bearing is assembled in the annular installation groove, damping rings are arranged between one end of the outer ring and the stopping shoulder and between the other end of the outer ring and the locking ring, and the damping rings are elastic and can absorb axial impact force from the lead screw. The ball screw transmission mechanism has the advantages that axial impact force borne by the lead screw can be absorbed through the elastic effect of the damping ring, then rigid collision between the lead screw and the lead screw nut and rigid collision between the bearing and the shell are avoided, and the service life of the ball screw transmission mechanism is guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of automotive power steering technology, specifically to a shock-absorbing and buffering mounting structure for an electric power steering system. Background Technology

[0002] Power steering is an essential component of a car's steering system. It reduces the effort required for the driver to turn the steering wheel, making driving easier and safer. Specifically, power steering uses external power (such as hydraulic or electric) to assist the driver in turning the steering wheel, thereby reducing physical exertion.

[0003] In terms of structural composition, the power steering device mainly includes a drive motor and a ball screw mechanism that is connected to it. The ball screw mechanism consists of a lead screw and a lead screw nut that is helically connected to the lead screw. The lead screw nut is rotatably mounted on the housing at the outer end of the lead screw through a bearing. The drive motor drives the lead screw nut to rotate, which enables the lead screw to move axially.

[0004] In the existing technology, no shock-absorbing structure is set between the lead screw and the lead screw nut, between the lead screw nut and the bearing, and between the bearing and the housing. When the car is bumpy, the impact force on the lead screw cannot be absorbed. Rigid collisions will occur between the lead screw and the lead screw nut, between the lead screw nut and the bearing, and between the bearing and the housing due to the impact force. This greatly accelerates the wear of the ball screw mechanism and reduces the service life of the power steering device. Utility Model Content

[0005] In view of this, the present invention provides a shock-absorbing and buffering installation structure for an electric power steering system, which can buffer and reduce the vibration of the lead screw and lead screw nut, thereby ensuring their normal service life.

[0006] To achieve the above objectives, the technical solution of this utility model is as follows:

[0007] An electric power steering shock-absorbing and buffering mounting structure includes a housing and a ball screw transmission mechanism disposed within the housing. The ball screw transmission mechanism includes a screw nut and a screw connected to the inside of the screw nut by ball screws. The screw nut is rotatably connected to the housing via a bearing. The housing is characterized by having an annular mounting groove on its inner wall. One axial end of the annular mounting groove has a stop shoulder, and the other end is fitted with a locking ring. The outer ring of the bearing is assembled within the annular mounting groove. Shock-absorbing rings are provided between one end of the outer ring and the stop shoulder, and between the other end and the locking ring. The shock-absorbing rings are elastic and capable of absorbing axial impact forces from the screw.

[0008] With the above structure, when the car experiences bumps during driving, the axial impact force on the lead screw can be transmitted to the bearing through the lead screw nut, and then to the damping ring through the bearing. Finally, the damping ring absorbs the axial impact force on the lead screw through its elasticity, thereby avoiding rigid collisions between the lead screw and the lead screw nut, as well as between the bearing and the housing, and ensuring the service life of the ball screw transmission mechanism.

[0009] Preferably, the bearing has mounting grooves at both ends of its outer ring, and the damping ring is located within these mounting grooves. This structure, with its mounting grooves, facilitates the rapid positioning and installation of the damping ring.

[0010] Preferably, the end of the housing away from the stop shoulder is provided with a threaded groove, and the locking ring is an annular plug screwed into the threaded groove. With this structure, the threaded assembly makes the locking ring assembly more stable. At the same time, the design of the stop shoulder and locking ring prevents the bearing from moving axially along the lead screw.

[0011] Preferably, the diameter of the threaded groove is larger than the diameter of the annular mounting groove. This structure facilitates the installation of the bearing within the annular mounting groove.

[0012] Preferably, the circumferential profile of the damping ring has a wavy structure. This structure more effectively disperses the impact force on the lead screw, further enhancing the stress-relief effect of the damping ring.

[0013] Preferably, the shock-absorbing ring is made of rubber. This structure provides the shock-absorbing ring with better elasticity and a longer service life.

[0014] Preferably, the housing is equipped with an auxiliary motor, which is poweredly connected to the lead screw nut. This structure provides rotational power for the lead screw nut, thereby facilitating power steering in the vehicle.

[0015] Preferably, the end of the lead screw away from the lead screw nut is formed with a rack, and a rotating rod is meshed on the rack. The distal end of the rotating rod is used to connect to the car steering wheel. With the above structure, the steering wheel drives the rotating rod to rotate, and then through the meshing transmission between the rotating rod and the rack, the lead screw can be driven to move back and forth along its length, thereby pulling the tie rod and realizing the steering of the car.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] By adopting the shock-absorbing and buffering mounting structure of the electric power steering provided by this utility model, when the car experiences bumps during driving, the axial impact force on the lead screw can be transmitted to the bearing through the lead screw nut, and then to the damping ring through the bearing. Finally, the damping ring absorbs the axial impact force on the lead screw through its elasticity, thereby avoiding rigid collisions between the lead screw and the lead screw nut, as well as between the bearing and the housing, and ensuring the service life of the ball screw transmission mechanism. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of shell 1;

[0019] Figure 2 For along Figure 1 Sectional view of AA;

[0020] Figure 3 For along Figure 1 Sectional view of BB;

[0021] Figure 4 for Figure 3 A magnified view of a portion of the image;

[0022] Figure 5 This is a schematic diagram of the internal structure of shell 1;

[0023] Figure 6 This is a schematic diagram of the structure of the shock-absorbing ring 5. Detailed Implementation

[0024] The present invention will be further described below with reference to the embodiments and accompanying drawings.

[0025] like Figures 1 to 5 As shown, an electric power steering shock absorption and buffer mounting structure includes a housing 1 and a ball screw transmission mechanism installed inside the housing 1. The ball screw transmission mechanism includes a screw nut 3 and a screw 2 connected inside the screw nut 3 by ball screws. The screw nut 3 is rotatably connected inside the housing 1 by a bearing 4. An annular mounting groove 1a is formed on the inner wall of the housing 1. One end of the annular mounting groove 1a has a stop shoulder 1b, and the other end is equipped with a locking ring 6. The outer ring 4a of the bearing 4 is assembled in the annular mounting groove 1a. A shock-absorbing ring 5 is provided between one end of the outer ring 4a and the stop shoulder 1b, and between the other end and the locking ring 6. The shock-absorbing ring 5 is elastic and can absorb the axial impact force from the screw 2.

[0026] With this design, when the car experiences bumps during driving, the axial impact force on the lead screw 2 can be transmitted to the bearing 4 via the lead screw nut 3, and then to the damping ring 5 via the bearing 4. Finally, the damping ring 5 absorbs the axial impact force on the lead screw 2 through its elasticity, thereby avoiding rigid collisions between the lead screw 2 and the lead screw nut 3, as well as between the bearing 4 and the housing 1, and ensuring the service life of the ball screw transmission mechanism.

[0027] like Figure 4 As shown, the outer ring 4a of the bearing 4 has mounting grooves 4b at both ends, and the shock-absorbing ring 5 is fitted into the mounting grooves 4b. This design facilitates the fitting of the shock-absorbing ring 5 and prevents it from falling off.

[0028] In this embodiment, the circumferential contour of the damping ring 5 is constructed as follows: Figure 6 The wave-shaped structure shown can more effectively disperse the impact force on the lead screw 2, further increasing the force relief effect of the shock-absorbing ring 5.

[0029] To ensure the elasticity and service life of the shock-absorbing ring 5, in this embodiment, the shock-absorbing ring 5 is preferably made of rubber.

[0030] like Figure 5 As shown, the end of the housing 1 away from the stop shoulder 1b is provided with a threaded groove 1c, and the locking ring 6 is an annular plug screwed into the threaded groove 1c. This design, through threaded assembly, makes the locking ring 6 more stable to assemble. At the same time, the design of the stop shoulder 1b and the locking ring 6 prevents the bearing 4 from moving axially along the lead screw 2.

[0031] Furthermore, such as Figure 5 As shown, the diameter of the threaded groove 1c is larger than the diameter of the annular mounting groove 1a. This design facilitates the installation of the bearing 4 within the annular mounting groove 1a.

[0032] like Figure 1 and Figure 3 As shown, a power steering motor 7 is fixedly installed on the housing 1. The power steering motor 7 is connected to the lead screw nut 3. With this design, the power steering motor 7 provides rotational power to the lead screw nut 3, thereby facilitating the power steering of the car.

[0033] For example Figure 2 and Figure 3 As shown, a rack 2a is formed at the end of the lead screw 2 away from the lead screw nut 3. A rotating rod 8 is meshed on the rack 2a, and the distal end of the rotating rod 8 is used to connect to the car steering wheel. With this design, the rotating rod 8 is rotated by the car steering wheel, and then the meshing transmission between the rotating rod 8 and the rack 2a can drive the lead screw 2 to move back and forth along its length, thereby realizing the steering of the car.

[0034] Finally, it should be noted that the above description is merely a preferred embodiment of the present utility model. Those skilled in the art, under the guidance of the present utility model, can make various similar representations without departing from the spirit and claims of the present utility model, and such modifications all fall within the protection scope of the present utility model.

Claims

1. A shock-absorbing and buffering mounting structure for an electric power steering system, comprising a housing (1) and a ball screw transmission mechanism disposed within the housing (1), wherein the ball screw transmission mechanism comprises a screw nut (3) and a screw (2) helically connected inside the screw nut (3) by ball bearings, the screw nut (3) being rotatably connected within the housing (1) by bearings (4), characterized in that: The inner wall of the housing (1) is provided with an annular mounting groove (1a). One end of the annular mounting groove (1a) has a stop shoulder (1b) and the other end is equipped with a locking ring (6). The outer ring (4a) of the bearing (4) is assembled in the annular mounting groove (1a). A shock-absorbing ring (5) is provided between one end of the outer ring (4a) and the stop shoulder (1b) and between the other end and the locking ring (6). The shock-absorbing ring (5) is elastic and can absorb the axial impact force from the lead screw (2).

2. The electric power assisted steering gear shock absorbing mounting structure according to claim 1, characterized by: The outer ring (4a) of the bearing (4) has mounting grooves (4b) at both ends, and the shock-absorbing ring (5) is located in the mounting groove (4b).

3. The electric power steering gear shock absorbing mounting structure according to claim 1, characterized by: The housing (1) has a threaded groove (1c) at the end away from the stop shoulder (1b), and the locking ring (6) is an annular plug screwed into the threaded groove (1c).

4. The electric power steering gear shock absorbing mounting structure according to claim 3, characterized by: The diameter of the threaded groove (1c) is larger than the diameter of the annular mounting groove (1a).

5. The electric power steering gear shock absorbing mounting structure according to claim 1, characterized by: The circumferential profile of the shock-absorbing ring (5) has a wave-shaped structure.

6. The electric power steering gear shock absorbing mounting structure according to claim 5, characterized by: The shock-absorbing ring (5) is made of rubber.

7. The electric power steering gear shock absorbing mounting structure according to claim 1, characterized by: The housing (1) is equipped with an assist motor (7), which is powered by the lead screw nut (3).

8. The electric power steering gear shock absorbing mounting structure according to claim 1, characterized by: The end of the lead screw (2) away from the lead screw nut (3) is formed with a rack (2a), and a rotating rod (8) is meshed on the rack (2a). The far end of the rotating rod (8) is used to connect to the car steering wheel.

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