阅读说明：本技术 一种压紧装置及助力转向系统 (Pressing device and power-assisted steering system ) 是由 李丰军 周剑光 于 2021-09-30 设计创作，主要内容包括：本发明涉及转向机技术领域,具体公开了一种压紧装置及助力转向系统,该压紧装置包括调节组件和压紧组件,其中调节组件对压紧组件远离传动杆的一端进行限位；由于,偏压力件设于调节组件和压紧组件之间,第一偏压力件对第二偏压力件施加使第二偏压力件靠近传动杆的偏压力。所以,第二偏压力件沿远离调节组件的方向运动,进而第二偏压力件驱动压紧组件向靠近传动杆的方向运动。因此,压紧组件给予传动杆一个预紧力,使传动杆始终与传动件预紧啮合。该装置解决了弹簧在长期的使用中存在弹簧塑性变形、弹簧回弹消弱、弹簧蠕变等一系列问题。(The invention relates to the technical field of steering machines, and particularly discloses a pressing device and a power-assisted steering system, wherein the pressing device comprises an adjusting component and a pressing component, wherein the adjusting component limits one end, far away from a transmission rod, of the pressing component; since the biasing force member is provided between the adjustment assembly and the hold-down assembly, the first biasing force member applies a biasing force to the second biasing force member to bring the second biasing force member closer to the transmission lever. Therefore, the second biasing member moves in a direction away from the adjustment assembly, and the second biasing member drives the hold-down assembly in a direction toward the drive link. Therefore, the pressing component gives a pretightening force to the transmission rod, so that the transmission rod is always in pretightening engagement with the transmission part. The device solves a series of problems of spring plastic deformation, spring rebound weakening, spring creep deformation and the like in long-term use of the spring.)

1. A compression device for compressing a transmission rod (200), the compression device (1) comprising:

the device comprises an adjusting assembly (11) and a pressing assembly (12), wherein the adjusting assembly (11) limits one end, far away from the transmission rod (200), of the pressing assembly (12);

and the number of the first and second groups,

a biasing member disposed between the adjustment assembly (11) and the compression assembly (12), the biasing member applying a biasing force to the compression assembly (12) to bring it closer to the drive link (200);

it is characterized in that the preparation method is characterized in that,

the biasing force piece comprises a first biasing force piece and a second biasing force piece which are arranged in a split mode, and the first biasing force piece exerts biasing force on the second biasing force piece to enable the second biasing force piece to be close to the transmission rod (200).

2. Pressing device according to claim 1, wherein the adjustment assembly (11) is movably connected to an adjacent component, the adjustment assembly (11) being arranged to change the biasing force of the biasing force member by changing the fixing position of the adjustment assembly (11).

3. The compression device of claim 1, wherein the biasing member is a magnetic biasing member, the first biasing member is a first magnet (13), the second biasing member is a second magnet (14), the first magnet (13) is fixedly attached to the adjustment assembly (11), the second magnet (14) is fixedly attached to the compression assembly (12), and opposite ends of the first magnet (13) and the second magnet (14) are repelled from each other.

4. Pressing device according to claim 3, characterized in that said first magnet (13) and said second magnet (14) are both permanent magnets;

or, the first magnet (13) and the second magnet (14) are both electromagnets;

or one of the first magnet (13) and the second magnet (14) is a permanent magnet, and the other is an electromagnet.

5. The pressing device according to claim 2, wherein the pressing assembly (12) comprises a pressing block (121) and a sliding piece (122), the sliding piece (122) is arranged at one end of the pressing block (121) far away from the adjusting assembly (11), and the sliding piece (122) is matched with the surface shape of the transmission rod (200).

6. The pressing device according to claim 5, characterized in that a rolling body (15) is embedded on the sliding piece (122), and the rolling body (15) is in rolling connection with the transmission rod (200).

7. The pressing device according to claim 6, wherein a sponge (16) is arranged between the sliding piece (122) and the pressing piece (121), and lubricating oil is stored in the sponge (16).

8. Pressing device according to claim 7, characterized in that the sponge (16) is arranged in correspondence with the rolling bodies (15).

9. Compacting device according to any of claims 1-8, characterized in that the adjustment unit (11) is provided with a detection hole (111).

10. A power steering system comprising:

the steering mechanism comprises a shell (100) and a transmission rod (200), wherein the transmission rod (200) is arranged in the shell (100);

the steering operation mechanism comprises a steering wheel and a transmission piece in transmission connection with the steering wheel, and the transmission piece is in transmission connection with the transmission side of the transmission rod (200);

it is characterized in that the preparation method is characterized in that,

the power steering system further comprises a hold-down device according to any one of claims 1 to 9, the hold-down device (1) abutting against a non-transmission side of the transmission rod (200).

11. An assisted power steering system according to claim 10, wherein the housing (100) comprises a mounting hole (101), the hold-down device (1) is mounted in the mounting hole (101), and the hold-down assembly (12) is slidable in the axial direction of the mounting hole (101).

12. Power steering system according to claim 11, characterized in that the hold-down assembly (12) comprises a press block (121), the periphery of the press block (121) being provided with a movable support (17).

13. An assisted power steering system according to claim 11, wherein the adjustment assembly (11) is connected to the mounting hole (101).

14. An assisted power steering system according to claim 13, wherein the hold-down device (1) further comprises an anti-release member (18), the anti-release member (18) being connected to the portion of the adjustment assembly (11) protruding out of the mounting hole (101).

Technical Field

The invention relates to the technical field of steering machines, in particular to a pressing device and a power-assisted steering system.

Background

A double-pinion electric power steering system (DP-EPS) is one of important directions of the technical development of an automobile chassis, and has wide application prospects in the fields of future wire control technology and intelligent driving.

The double-pinion electric power steering system mainly comprises a rack, a steering gear shaft, a driving gear shaft, a rack bushing, a worm gear, a pressing device, a pull rod assembly, a bearing, a sensor, a motor assembly and the like, wherein the pressing device is an important component of the steering system and plays an important role in realizing the functions of the system and the stable work of the rack.

The core structure of the transmission mechanism of the double-pinion electric power steering system is a rack, a gear shaft and the like, and in order to realize meshing transmission between the rack and the gear shaft and eliminate gaps and impact noise between gear pairs, a certain pre-tightening force needs to be applied to the back side of teeth of the rack. The application of the pre-tightening force on the back side of the gear can realize the pre-tightening meshing of the rack and the gear shaft, and the meshing contact ratio of the gear pair is increased.

Currently, the elasticity of the spring is mostly used as the pretightening force to act on the tooth back, but the spring has a series of problems of spring plastic deformation, spring rebound weakening, spring creep and the like in long-term use, so that the pretightening force of the pressing block is weakened, and the meshing transmission of the rack and the gear shaft is adversely affected.

Disclosure of Invention

The invention aims to: the pressing device and the power-assisted steering system are provided to solve the problems that in the prior art, a series of problems of spring plastic deformation, spring rebound weakening, spring creep and the like exist in long-term use of a spring, so that the pretightening force of a pressing block is weakened, and therefore the meshing transmission of a rack and a gear shaft is adversely affected.

In one aspect, the present invention provides a compression apparatus for compressing a transmission rod, the compression apparatus comprising:

the adjusting assembly limits one end, far away from the transmission rod, of the pressing assembly;

and the number of the first and second groups,

the biasing force piece is arranged between the adjusting assembly and the pressing assembly and applies biasing force to the pressing assembly to enable the pressing assembly to be close to the transmission rod;

the biasing force member comprises a first biasing force member and a second biasing force member which are arranged in a split manner, and the first biasing force member exerts a biasing force on the second biasing force member to enable the second biasing force member to be close to the transmission rod.

As an alternative to the compression device, the adjustment assembly is adapted to be movably connected to an adjacent component, the adjustment assembly being arranged to change the biasing force of the biasing force member by changing the fixing position of the adjustment assembly.

As an optional technical solution of the pressing device, the biasing force member is a magnetic biasing force member, the first biasing force member is a first magnet, the second biasing force member is a second magnet, the first magnet is fixedly connected to the adjusting assembly, the second magnet is fixedly connected to the pressing assembly, and opposite ends of the first magnet and the second magnet repel each other.

As an optional technical scheme of the pressing device, both the first magnet and the second magnet are permanent magnets;

or, the first magnet and the second magnet are both electromagnets;

or one of the first magnet and the second magnet is a permanent magnet, and the other is an electromagnet.

As an optional technical scheme of the pressing device, the pressing assembly comprises a pressing block and a sliding piece, the sliding piece is arranged at one end, away from the adjusting assembly, of the pressing block, and the sliding piece is matched with the surface shape of the transmission rod.

As an optional technical scheme of the pressing device, a rolling body is embedded in the sliding sheet and is in rolling connection with the transmission rod.

As the optional technical scheme of the pressing device, a sponge body is arranged between the sliding sheet and the pressing block, and lubricating oil is stored in the sponge body.

As an optional technical scheme of the pressing device, the sponge body is arranged corresponding to the rolling body.

As an optional technical scheme of the pressing device, a detection hole is formed in the adjusting assembly.

In another aspect, the present invention also provides a power steering system, including:

the steering mechanism comprises a shell and a transmission rod, and the transmission rod is arranged in the shell;

the steering operation mechanism comprises a steering wheel and a transmission piece in transmission connection with the steering wheel, and the transmission piece is in transmission connection with the transmission side of the transmission rod;

the pressing device in any one of the above aspects is further included, and the pressing device abuts against the non-transmission side of the transmission rod.

As an alternative solution to the power steering system, the housing includes a mounting hole, the pressing device is mounted in the mounting hole, and the pressing assembly is capable of sliding along an axial direction of the mounting hole.

As an optional technical scheme of the power-assisted steering system, the pressing assembly comprises a pressing block, and a movable supporting piece is arranged on the periphery of the pressing block.

As an optional technical scheme of the power-assisted steering system, the adjusting assembly is connected with the mounting hole.

As an optional technical solution of the power steering system, the pressing device further includes an anti-loosening element, and the anti-loosening element is connected with a portion of the adjusting assembly extending out of the mounting hole.

The invention has the beneficial effects that:

the invention provides a pressing device which comprises an adjusting assembly and a pressing assembly, wherein the adjusting assembly limits one end, far away from a transmission rod, of the pressing assembly; since the biasing force member is provided between the adjustment assembly and the hold-down assembly, the first biasing force member applies a biasing force to the second biasing force member to bring the second biasing force member closer to the transmission lever. Therefore, the second biasing member moves in a direction away from the adjustment assembly, and the second biasing member drives the hold-down assembly in a direction toward the drive link. Therefore, the pressing component gives a pretightening force to the transmission rod, so that the transmission rod is always in pretightening engagement with the transmission part. Therefore, the device solves the problem that the pre-tightening force of the pressing assembly is weakened due to a series of problems of spring plastic deformation, spring rebound weakening, spring creep deformation and the like existing in the long-term use of the spring, so that the engagement transmission of the transmission rod and the transmission part is adversely affected.

Drawings

FIG. 1 is a schematic diagram of a power steering system according to an embodiment of the present invention;

FIG. 2 is a schematic view of the assembly of the pressing device and the housing according to the embodiment of the present invention;

FIG. 3 is a first schematic structural diagram of a pressing device according to an embodiment of the present invention;

FIG. 4 is a second schematic structural view of a pressing device according to an embodiment of the present invention;

FIG. 5 is a third schematic structural view of a pressing device according to an embodiment of the present invention;

FIG. 6 is a cross-sectional view of a compression device in an embodiment of the present invention;

FIG. 7 is an exploded view of a hold down device in an embodiment of the present invention;

FIG. 8 is a graph of the pressure of the compact versus the spacing between the first magnet and the second magnet in an embodiment of the present invention;

FIG. 9 is a schematic view of the first and second magnets in an embodiment of the present invention;

FIG. 10 is a schematic structural diagram of a slider according to an embodiment of the present invention;

FIG. 11 is a schematic structural diagram of a sponge according to an embodiment of the present invention.

In the figure:

100. a housing; 101. mounting holes; 200. a transmission rod;

1. a pressing device;

11 an adjustment assembly; 111. a detection hole;

12. a compression assembly; 121. briquetting; 1211. mounting grooves; 1212. sealing the groove; 122. sliding blades; 1221. a limiting hole;

13. a first magnet; 14. a second magnet; 15. a rolling body; 16. a sponge body; 17. a movable support; 18. an anti-loosening element; 19. and a rubber plug.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Where the terms "first position" and "second position" are two different positions, and where a first feature is "over", "above" and "on" a second feature, it is intended that the first feature is directly over and obliquely above the second feature, or simply means that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

A double-pinion electric power steering system (DP-EPS) is one of important directions of the technical development of an automobile chassis, and has wide application prospects in the fields of future wire control technology and intelligent driving.

As shown in fig. 1, the present embodiment provides a power steering system including a steering mechanism and a steering operation mechanism.

The steering mechanism comprises a shell 100 and a transmission rod 200, wherein the transmission rod 200 is arranged in the shell 100; the steering operation mechanism comprises a transmission piece which is in transmission connection with the transmission rod 200 at one side;

specifically, in this embodiment, the transmission rod 200 is a rack, the transmission member is a gear, and the gear is engaged with the rack to realize transmission, but in other embodiments, the transmission rod 200 may also be a worm mechanism, a screw rod, etc., and the transmission member corresponding thereto may be a worm wheel, a gear, etc.

The hold-down device plays a crucial role in steering systems as an important means for the pretensioning engagement of the transmission rod and the transmission element.

In the prior art, the pressing device generally includes an adjusting assembly 11, a pressing assembly 12 and a spring, a mounting hole 101 is provided on a housing 100 at a position opposite to a gear shaft on a non-transmission side (i.e., a tooth back side) of a rack, the pressing assembly 12 and the adjusting assembly 11 are sequentially provided in the mounting hole 101 along a direction away from the rack, the adjusting assembly 11 is connected with a hole wall of the mounting hole 101, and the pressing assembly 12 is in sliding fit with an inner wall of the mounting hole 101 along an axial direction of the mounting hole 101. The spring is arranged between the adjusting component 11 and the pressing component 12, and the pressing component 12 slides towards the direction close to the rack under the action of the elastic force of the spring, so that the pressing component 12 gives a pre-tightening force to the back side of the teeth of the rack. However, with long-term use, the spring has a series of problems such as plastic deformation, spring rebound weakening, spring creep and the like, which leads to the weakening of the pretightening force of the pressing block 121 and thus has a problem of adverse effect on the meshing transmission of the rack and the gear shaft.

As shown in fig. 2 to 7, the present embodiment provides a pressing device acting on the transmission rod 200, in the present embodiment, the transmission rod 200 is a rack, in the present embodiment, the rack is taken as an example, the rack is divided into a transmission side (finger tooth side) and a non-transmission side (finger tooth back side) opposite to the transmission side, and the transmission side is engaged with the gear.

The pressing device of the embodiment further comprises a biasing force member, and the biasing force member comprises a first biasing force member and a second biasing force member. The first biasing force member is fixedly connected with the adjusting assembly 11, the second biasing force member is fixedly connected with the pressing assembly 12, the first biasing force member and the second biasing force member are opposite and have mutually exclusive biasing forces, and the biasing force between the first biasing force member and the second biasing force member is gradually increased along with the gradual reduction of the distance between the first biasing force member and the second biasing force member.

The adjustment assembly 11 and the hold-down assembly 12 are both disposed in the mounting hole 101, wherein the adjustment assembly 11 is movably coupled, in this embodiment threaded, to the mounting hole 101, and the adjustment assembly 11 is configured to change the range of the biasing force of the magnetic biasing force member by changing the fixed position of the adjustment assembly 11 relative to the mounting hole 101. In other words, by turning the adjustment adjusting assembly 11, changing its depth of screwing into the mounting hole 101 changes the relative positions of the first biasing force member and the second biasing force member, thereby achieving a range of force applied by the second biasing force member to the pressing assembly 12, i.e., a range of adjustment biasing force.

Specifically, the first biasing force member and the second biasing force member are a first magnet 13 and a second magnet 14, respectively, the first magnet 13 and the second magnet 14 are homopolarly opposite, and the biasing force is a repulsive force exerted by the first magnet 13 to the second magnet 14. One end of the pressing component 12 is opposite to the adjusting component 11, the other end is opposite to the non-transmission side of the rack, and the pressing component 12 moves in a sliding mode with the installation hole 101 along the axial direction of the installation hole 101. Therefore, the pressing component 12 applies a pre-tightening force to the rack from the non-transmission side to the transmission side, so that the rack is always in pre-tightening engagement with the gear. Therefore, the device is not provided with a spring, so that the problem that the pretightening force of the pressing assembly 12 is weakened due to a series of problems of spring plastic deformation, spring rebound weakening, spring creep and the like existing in the long-term use of the spring, and the meshing transmission of the rack and the gear is adversely affected is solved.

Wherein the first magnet 13 and the second magnet 14 are both permanent magnets; or both the first magnet 13 and the second magnet 14 are electromagnets; or the first magnet 13 and the second magnet 14 are one permanent magnet and the other electromagnet. For the fixing manner of the first magnet 13 and the second magnet 14 to the adjusting assembly 11 and the compressing assembly 12, the first magnet 13 and the second magnet 14 may be fixed to the adjusting assembly 11 and the compressing assembly 12 by gluing, or the first magnet 13 and the second magnet 14 may be inserted into the adjusting assembly 11 and the compressing assembly 12 by interference fit. In this embodiment, the first magnet 13 and the second magnet 14 are both permanent magnets, and no significant magnetic loss occurs after long-term use. In other embodiments, the first magnet 13 and the second magnet 14 may be both electromagnets, and the magnetic strength of the electromagnets may be adjusted by adjusting the current applied to the electromagnets, so as to adjust the magnetic force between the first magnet 13 and the second magnet 14; in addition, the first magnet 13 and the second magnet 14 may also be arranged such that one is a permanent magnet and the other is an electromagnet, and the strength of the magnetic force of the electromagnet can be adjusted by adjusting the magnitude of the current flowing into the electromagnet, thereby adjusting the magnitude of the magnetic force between the first magnet 13 and the second magnet 14.

Referring to fig. 8, the present embodiment provides a biasing force by providing a pair of magnets, and since the force of the magnetic force is inversely proportional to the cube of the distance between the magnets, the repulsive force of the interaction between the two magnets increases exponentially as the distance between the two magnets gradually decreases, and thus the magnetic force has an advantage of increasing more rapidly than the spring force, compared to the elastic force of the spring. The invention realizes the quick establishment and feedback of the biasing force just by arranging the biasing force member comprising the pair of magnets, when the rack is subjected to bending deformation or position deviation, the magnetic biasing force member of the embodiment can quickly form the biasing force applied to the rack, so that the rack is kept meshed with the gear, and the timeliness of the feedback of the pressing device and the working reliability of a steering system are improved.

As for the shapes of the first magnet 13 and the second magnet 14, as shown in fig. 9, in the present embodiment, the sections of the first magnet 13 and the second magnet 14 in the direction perpendicular to the axis of the mounting hole 101 are the same. The first magnet 13 and the second magnet 14 are different in thickness in the axial direction of the mounting hole 101.

As shown in FIG. 8 or 9, the first magnet 13 and the second magnet 14 are both permanent magnets, the axial thickness of the first magnet 13 is h1, the axial thickness of the second magnet 14 is h2, and h2/h1 is greater than or equal to 2.

Further, the thickness h1 of the first magnet 13 in the axial direction of the mounting hole 101 is not less than 2mm, and the thickness h2 of the second magnet 14 in the axial direction of the mounting hole 101 is not less than 4 mm. For example, the thickness of the first magnet 13 is half of the thickness of the second magnet, the thickness of the first magnet 13 is 3.5mm, the thickness of the second magnet 14 is 7mm, the thickness of the first magnet 13 is 4mm, the thickness of the second magnet 14 is 8mm, or the thickness of the first magnet 13 is 5mm, the thickness of the second magnet 14 is 10mm, or the like.

In the embodiment, the axial distance between the first magnet 13 and the second magnet 14 is d, namely the axial distance between the opposite axial end surfaces of the first magnet and the second magnet is d, and then d is more than or equal to 1.5 mm. By the above arrangement, it is ensured that the variation range of the repulsive force between the first magnet 13 and the second magnet 14 is maintained between 200N and 500N, thereby providing an appropriate biasing force to the rack, avoiding damage to the rack and the pinion due to an excessive pressure, and avoiding a bias failure due to an insufficient pressure.

As shown in fig. 6, 7 and 10, for the specific structure of the pressing assembly 12, optionally, the pressing assembly 12 includes a pressing block 121 and a sliding piece 122, the sliding piece 122 is disposed at one end of the pressing block 121 far away from the adjusting assembly 11, and the sliding piece 122 is adapted to the surface shape of the transmission rod 200 for abutting against the transmission rod 200. In this embodiment, the shape of the sliding piece 122 is consistent with the shape of the transmission rod 200 abutted against the sliding piece 122, one of the end surface of the sliding piece 122 opposite to the pressing block 121 and the end surface of the pressing block 121 opposite to the sliding piece 122 is provided with an insertion groove, and the other end is provided with an insertion pin, so that the sliding piece 122 can only move relative to the pressing block 121 along the axial direction of the pressing block 121, and the arrangement facilitates the replacement of the sliding piece 122.

It is also noted that the slide 122 is made of an engineering plastic. In particular, made of PA66 (polyamide 66), it has the advantages of strong impact resistance, high rigidity and high rigidity, so it not only satisfies the supporting function of the sliding piece 122 to the transmission rod 200, but also is beneficial to reduce the abrasion and impact of the transmission rod 200 to the sliding piece 122.

When the transmission rod 200 and the sliding piece 122 slide relatively, the transmission rod 200 and the sliding piece 122 are in surface contact, and the contact surface between the transmission rod 200 and the sliding piece 122 is easily abraded due to the arrangement, so that the strength of the transmission rod 200 and the strength of the sliding piece 122 are influenced. Aiming at the defect, the surface of the sliding sheet 122 is provided with a plurality of limiting holes 1221; the rolling bodies 15 are respectively arranged in the limiting holes 1221, the limiting holes 1221 allow the rolling bodies 15 in the limiting holes to roll in, the rolling bodies 15 are balls, and the rolling bodies 15 partially extend out of the limiting holes 1221 and are used for being abutted against the transmission rod 200. In this embodiment, the rolling friction between the rolling element 15 and the transmission rod 200 can reduce the friction wear between the sliding piece 122 and the transmission rod 200.

In order to further reduce the frictional wear between the rolling body 15 and the transmission rod 200 and the frictional wear between the rolling body 15 and the hole wall of the limiting hole 1221, lubricating oil is usually filled between the limiting hole 1221 and the rolling body 15, but in long-term use, the lubricating oil is oxidized and deteriorated, and the lubricating performance of the lubricating oil is further affected.

To this end, as shown in fig. 6, 7 and 11, the compressing assembly 12 further includes a sponge 16 disposed between the pressing block 121 and the sliding piece 122, a mounting groove 1211 is concavely disposed on a surface of the pressing block 121 opposite to the sliding piece 122, the sponge 16 is disposed in the mounting groove 1211, the sponge 16 abuts against the sliding piece 122, and the sponge 16 stores lubricant oil therein. In this embodiment, when the transmission rod 200 slides along the axial direction thereof, the transmission rod 200 will bend and deform in a direction approaching the pressing block 121, and since the sliding piece 122 is pressed by the transmission rod 200 and the pressing block 121 corresponding thereto, the sliding piece 122 will deform, thereby causing the sponge 16 to be squeezed. The sponge body 16 is extruded to cause the lubricating oil inside to flow out, and then the lubricating oil flows into the limiting hole 1221, so that the lubricating oil is obtained between the limiting hole 1221 and the rolling body 15 and between the rolling body 15 and the transmission rod 200; when the transmission rod 200 stops sliding along the axial direction thereof, the transmission rod 200 is restored to the original state, and the sliding piece 122 is further restored to the original state, so that the sponge 16 is also restored to the original state, and in the process, the sponge 16 can suck the lubricating oil in the limiting hole 1221 into the sponge 16 again. The grease in the sponge 16 has a small contact area with air, and therefore, the grease is beneficial to relieving the oxidative deterioration of the lubricating oil. In other embodiments, an installation groove 1211 may be concavely disposed on a surface of the sliding piece 122 opposite to the pressing piece 121, and the sponge 16 is disposed on the installation groove 1211 of the sliding piece 122. Or the sponge 16 can be directly clamped between the pressing block 121 and the sliding piece 122.

As shown in fig. 2 to 7, the pressing piece 121 is sleeved on a peripheral wall thereof with a movable support member 17. In this embodiment, the pressing block 121 is provided with a plurality of sealing grooves 1212 at intervals on the circumferential wall thereof, the plurality of movable supporting members 17 are located in the plurality of sealing grooves 1212 in a one-to-one correspondence manner, and the plurality of movable supporting members 17 are also respectively abutted against the groove walls of the plurality of sealing grooves 1212 while the plurality of movable supporting members 17 are simultaneously abutted against the inner wall of the mounting hole 101. On one hand, the movable support 17 is provided to prevent external dust, moisture and the like from entering the interior of the housing 100 through the mounting hole 101; secondly, the movable support 17 may also prevent the generation of collision noise between the pressing piece 121 and the hole wall of the installation hole 101. On the other hand, by providing two or more movable supporting members 17, not only the sealing problem can be solved, but also the stable sliding of the press block in the mounting hole 101 can be ensured. In particular, the movable support 17 may employ a sealing ring, such as a rubber sealing ring or the like.

During long-term use, the relative position between the adjustment assembly 11 and the mounting hole 101 is likely to change due to its own vibration or the like. To prevent this, the device is provided with a locking member 18, and optionally, the locking member 18 is a locknut, and the locknut is screwed on the portion of the adjusting assembly 11 extending from the end of the mounting hole 101 away from the transmission rod 200, and is screwed with the adjusting assembly 11 and abuts against the housing 100. In this embodiment, since the locknut 18 abuts against the housing 100, a pretightening force along the axial direction of the mounting hole 101 exists between the adjusting assembly 11 and the housing 100, and the pretightening force increases the friction between the threads of the adjusting assembly 11 and the threads of the housing 100, so as to prevent the adjusting assembly 11 from rotating, and further prevent the adjusting assembly 11 from moving relative to the housing 100. In other embodiments, the release member 18 is a plug, a plurality of pin holes are formed along the axial direction of the adjusting assembly 11, and a locking hole is formed in the hollow wall of the mounting hole 101, and the plug passes through the locking hole and is inserted into the corresponding pin hole. This arrangement also prevents the adjustment assembly 11 from sliding axially along the mounting hole 101.

The adjusting assembly 11 is provided with a detection hole 111 along the sliding direction of the pressing assembly 12. The jumping of the rack pressing block can be detected through the detection hole 111, so that the meshing fluctuation condition of the rack and the gear shaft of the steering system in the working process can be detected. And observing or measuring the relative distance and the operating state between the first magnet 13, the second magnet 14, and the pressure piece 121. The detection hole 111 in this embodiment is a matching hole of the shaft end of the adjusting assembly 11, which is sealed with the rubber stopper 19.

In order to prevent moisture and dust from entering the housing 100 from the detecting hole 111, the pressing device 1 further includes a rubber plug 19, and the rubber plug 19 extends into the detecting hole 111 from an end of the adjusting component 11 away from the pressing component 12 and is in snap-fit connection with the adjusting component 11. In other embodiments, the rubber plug 19 may be screwed with the detection hole 111.

It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.