CN213534835U

CN213534835U - Electric power steering device and nut limiting device thereof

Info

Publication number: CN213534835U
Application number: CN202022110943.3U
Authority: CN
Inventors: 朱胜峰; 朱兴旺; 戴荷怡; 虞忠潮; 蔡磊杰; 周珑
Original assignee: Hangzhou Shibao Auto Steering Gear Co ltd
Current assignee: Hangzhou Shibao Auto Steering Gear Co ltd
Priority date: 2020-09-23
Filing date: 2020-09-23
Publication date: 2021-06-25
Anticipated expiration: 2030-09-23

Abstract

The utility model discloses an electric power steering device and nut stop device thereof relates to power transmission technical field, establish the steering nut in the screw-nut periphery including setting element, screw-nut and cover, the setting element include the locating lever that sets up with the locating cap is perpendicular, the outer wall at steering nut is installed to the locating cap, the one end and the locating cap of locating lever are connected, the other end of locating lever passes steering nut and is connected with screw-nut, screw-nut ring is established on the lead screw, steering nut and output shaft meshing. When the screw rod is driven by the meshing of the worm and gear to rotate, the screw rod nut moves axially under the driving of the screw rod and tends to rotate, the steering nut is meshed with the output shaft, the screw rod nut and the steering nut are fixed together by the positioning cap and the positioning rod, so that the screw rod nut and the steering nut do not move relatively, the rotating motion of the screw rod nut is eliminated, and the screw rod nut can drive the steering nut to move.

Description

Electric power steering device and nut limiting device thereof

Technical Field

The utility model relates to a power transmission technical field, concretely relates to electric power steering device and nut stop device thereof.

Background

The electric steering gear of the recirculating ball is characterized in that a motor drives a steering screw nut to move up and down through a speed reducing mechanism, the steering screw nut is converted into an output shaft to rotate, the purpose of steering is achieved, the steering nut is sleeved outside a screw rod nut, the steering nut is meshed with the output shaft, when a worm gear is meshed with a transmission driving screw rod to rotate, the screw rod nut is easily influenced by the screw rod to rotate, the screw rod nut cannot drive the steering nut to move axially, and further the motion of the output shaft is influenced.

SUMMERY OF THE UTILITY MODEL

1. Technical problem to be solved by the utility model

The technical problem to lead screw nut can't drive steering nut axial motion because of the rotation, the utility model provides an electronic power assisted steering device and nut stop device thereof, it is together fixed with lead screw nut and steering nut through location cap and locating lever, makes lead screw nut and steering nut not take place relative displacement, has eliminated lead screw nut's rotary motion, makes lead screw nut can drive the steering nut motion.

2. Technical scheme

In order to solve the above problem, the utility model provides a technical scheme does: the utility model provides a nut stop device, establishes the steering nut at the screw-nut periphery including setting element, screw-nut and cover, the setting element includes location cap and the locating lever that sets up perpendicularly with the location cap, the outer wall at steering nut is installed to the location cap, the one end and the location cap of locating lever are connected, the other end of locating lever passes steering nut and is connected with screw-nut, screw-nut ring is established on the lead screw, steering nut and output shaft meshing.

When the screw rod is driven by the meshing of the worm and gear to rotate, the screw rod nut moves axially under the driving of the screw rod and tends to rotate, the steering nut is meshed with the output shaft, the screw rod nut and the steering nut are fixed together by the positioning cap and the positioning rod, so that the screw rod nut and the steering nut do not move relatively, the rotating motion of the screw rod nut is eliminated, and the screw rod nut 2 can drive the steering nut to move.

Optionally, the steering nut is provided with a positioning hole, a groove is arranged on the lead screw nut at a position corresponding to the positioning hole, and the positioning rod penetrates through the positioning hole and is connected with the groove in a matching manner.

Optionally, the diameter of the positioning cap is larger than that of the positioning hole, and the diameter of the positioning rod is smaller than that of the positioning hole.

Optionally, an anaerobic adhesive layer formed by spraying anaerobic adhesive is arranged between the positioning rod and the positioning hole, and an anaerobic adhesive layer formed by spraying anaerobic adhesive is arranged between the positioning rod and the groove.

Optionally, a cavity is arranged between the feed screw nut and the steering nut.

Optionally, the nut stop device still includes the lead screw, turn to the nut and include first body and set up the limiting plate at first body both ends and perpendicular to first body, screw-nut includes the second body and sets up the terminal surface at second body both ends and perpendicular to second body, the cavity has between first body and the second body, limiting plate and terminal surface all are equipped with the hole that supplies the lead screw to pass, the inside wall of limiting plate supports each other with the lateral wall of terminal surface and supports.

Optionally, the first body is provided with a positioning hole, and a groove is formed in a position of the second body corresponding to the positioning hole, or the first limiting plate is provided with a positioning hole, and a groove is formed in a position of the end face corresponding to the positioning hole.

Optionally, a steel ball is arranged between the steering nut and the screw rod, and the steel ball rolls in a ball groove formed by the screw rod and the steering nut.

Optionally, the screw rod is provided with a plurality of reversers, each reverser is provided with a ball returning groove for the steel ball to pass through, and the opening end of each ball returning groove faces towards the screw rod.

The utility model also discloses an electric power steering device, including output shaft, worm wheel, with worm wheel complex worm, the motor of being connected with the worm and the above nut stop device, the worm wheel cover is established on the lead screw, the output shaft meshes with steering nut.

3. Advantageous effects

Adopt the technical scheme provided by the utility model, compare with prior art, have following beneficial effect:

(1) the nut stop device that this application embodiment provided, when the lead screw was taken place to rotate by worm gear meshing drive, axial motion took place for screw-nut under the drive of lead screw to have rotary motion's inclination, steering nut and output shaft meshing, positioning cap and locating lever are together fixed with screw-nut and steering nut, make screw-nut and steering nut not take place relative displacement, eliminated screw-nut's rotary motion, make screw-nut 2 can drive the steering nut motion.

(2) The nut stop device that this application embodiment provided, when the output shaft to steering nut applys reaction force, steering nut atress is towards radial direction motion, because the cavity has between screw-nut and the steering nut, makes the screw-nut who sets up in steering nut inside can not receive the effect of radial force, avoids making the lead screw atress warp.

Drawings

Fig. 1 is a schematic structural view of a nut limiting device according to an embodiment of the present invention.

Fig. 2 is a schematic view of a steering nut of the nut limiting device according to an embodiment of the present invention.

Fig. 3 is a schematic view of a lead screw nut of the nut limiting device according to an embodiment of the present invention.

Fig. 4 is a schematic structural view of an electric power steering apparatus according to an embodiment of the present invention.

Detailed Description

For a further understanding of the present invention, reference will be made to the following detailed description taken in conjunction with the accompanying drawings and examples.

The present application will be described in further detail with reference to the following drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and are not limiting of the invention. It should be noted that, for convenience of description, only the portions related to the present invention are shown in the drawings. The utility model discloses in words such as first, second, be for the description the utility model discloses a technical scheme is convenient and set up, and does not have specific limiting action, is general finger, right the technical scheme of the utility model does not constitute limiting action. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; 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 meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art. The technical solutions in the same embodiment and between the technical solutions in different embodiments can be arranged and combined to form a new technical solution without contradiction or conflict, which is all within the scope of the present invention.

Example 1

With reference to fig. 1-4, the nut limiting device of the present embodiment includes a positioning piece 3, a screw nut 2 and a steering nut 1 sleeved on the periphery of the screw nut 2, the positioning piece 3 includes a positioning cap 31 and a positioning rod 32 vertically disposed with the positioning cap 31, the positioning cap 31 is installed on the outer wall of the steering nut 1, one end of the positioning rod 32 is connected with the positioning cap 31, the other end of the positioning rod 32 passes through the steering nut 1 to be connected with the screw nut 2, the screw nut 2 is annularly disposed on the screw rod 4, and the steering nut 1 is engaged with the output shaft 5. When the screw rod 4 is driven to rotate by the meshing of the worm wheel 6 and the worm 7, the screw rod nut 2 moves axially under the driving of the screw rod 4 and has a tendency of rotating, the steering nut 1 is meshed with the output shaft 5, the positioning cap 31 and the positioning rod 32 fix the screw rod nut 2 and the steering nut 1 together, so that the screw rod nut 2 and the steering nut 1 do not move relatively, the rotating motion of the screw rod nut 2 is eliminated, and the screw rod nut 2 can drive the steering nut 1 to move.

Example 2

With reference to fig. 1-4, compared with the technical solution of embodiment 1, the nut limiting device of the present embodiment can be improved as follows: the steering nut 1 is provided with a positioning hole 11, a groove 21 is formed in the position, corresponding to the positioning hole 11, of the feed screw nut 2, and the positioning rod 32 penetrates through the positioning hole 11 and is connected with the groove 21 in a matched mode. The positioning rod 32 penetrates through the positioning hole 11 to be matched and connected with the groove 21, so that the steering nut 1 and the feed screw nut 2 are fixed together, and the rotary motion of the feed screw nut 2 is limited.

Example 3

With reference to fig. 1-4, compared with the technical solution of embodiment 1 or 2, the nut limiting device of this embodiment can be improved as follows: the diameter of the positioning cap 31 is larger than that of the positioning hole 11, and the diameter of the positioning rod 32 is smaller than that of the positioning hole 11. The diameter of the positioning rod 32 is smaller than that of the positioning hole 11, so that the positioning rod 32 can penetrate through the positioning hole 11 to be matched with the groove 21, the diameter of the positioning cap 31 is larger than that of the positioning hole 11, the positioning cap 31 is limited on the outer wall of the steering nut 1, and the purpose of fixing the steering nut 1 and the feed screw nut 2 is achieved.

Example 4

With reference to fig. 1 to 4, compared with any one of the technical solutions of embodiments 1 to 3, the nut limiting device of the present embodiment may be improved as follows: an anaerobic adhesive layer 33 formed by spraying adhesive is arranged between the positioning rod 32 and the positioning hole 11, and the anaerobic adhesive layer 33 formed by spraying adhesive is arranged between the positioning rod 32 and the groove 21. The anaerobic adhesive layer 33 can effectively prevent the positioning piece 3 from loosening, further fasten the positioning piece 3 and prevent the steering nut 1 from being separated from the screw nut 2.

Example 5

With reference to fig. 1 to 4, compared with any one of the technical solutions of embodiments 1 to 4, the nut limiting device of the present embodiment may be improved as follows: and a cavity is arranged between the feed screw nut 2 and the steering nut 1. When the output shaft 5 applies a reaction force to the steering nut 1, the steering nut is stressed to move towards the radial direction, and the feed screw nut 2 arranged inside the steering nut 1 cannot be stressed by the radial force due to the cavity between the feed screw nut 2 and the steering nut 1, so that the deformation of the feed screw under stress is avoided.

Example 6

With reference to fig. 1 to 4, compared with any one of the technical solutions of embodiments 1 to 5, the nut limiting device of the present embodiment may be improved as follows: nut stop device still includes lead screw 4, turn to nut 1 and include first body 12 and set up limiting plate 13 at first body 12 both ends and the first body 12 of perpendicular to, lead screw nut 2 includes second body 22 and sets up the terminal surface 23 at second body 22 both ends and perpendicular to second body 22, the cavity has between first body 12 and the second body 22, limiting plate 13 and terminal surface 23 all are equipped with the hole that supplies lead screw 4 to pass, the inside wall of limiting plate 13 supports each other with the lateral wall of terminal surface 23 and leans on. The inner side wall of the limiting plate 13 is abutted against the outer side wall of the end face 23, so that the screw rod nut 2 is fixed inside the steering nut 1, and axial displacement between the screw rod nut 2 and the steering nut 1 is avoided.

Example 7

With reference to fig. 1 to 4, compared with any one of the technical solutions of embodiments 1 to 6, the nut limiting device of the present embodiment may be improved as follows: the first body 12 is provided with a positioning hole 11, a groove 21 is formed in a position, corresponding to the positioning hole 11, of the second body 22, the positioning piece 3 penetrates through the positioning hole 11 to be matched with the groove 21, the steering nut 1 and the screw nut 2 are fixed together, and therefore the rotary motion of the screw nut 2 is limited, the first body 12 has a large surface area relative to the first limiting plate 13, and the second body 22 has a large surface area relative to the end face 23, and therefore the positioning piece 3 can be installed conveniently. In other embodiments, the first limiting plate 13 is provided with a positioning hole 11, and the end surface 23 is provided with a groove 21 at a position corresponding to the positioning hole 11.

Example 8

With reference to fig. 1 to 4, compared with any of the technical solutions of embodiments 1 to 7, the nut limiting device of the present embodiment may be improved as follows: and a steel ball 41 is arranged between the steering nut 1 and the screw rod 4, and the steel ball 41 rolls in a ball groove formed by the screw rod and the steering nut 1. When the screw rod and the screw rod nut 2 move relatively, the steel ball 41 rolls in the ball groove, so that the sliding friction is changed into rolling friction, and the transmission efficiency is improved.

Example 9

With reference to fig. 1 to 4, compared with any one of the technical solutions of embodiments 1 to 8, the nut limiting device of the present embodiment may be improved as follows: the screw rod 4 is provided with a plurality of reversers 42, the reversers 42 are provided with ball returning grooves 421 for the steel balls 41 to pass through, and the opening ends of the ball returning grooves 421 face the screw rod 4. The ball returning groove 421 changes the rolling direction of the steel ball 41, so that the ball returning groove 421 and the ball groove form a closed loop, and the steel ball 41 rolls in the closed loop to achieve the purpose of circular rolling.

Example 10

With reference to fig. 1-4, the electric power steering apparatus of the present embodiment includes an output shaft 5, a worm wheel 6, a worm 7 engaged with the worm wheel 6, a motor 8 connected to the worm 7, and a nut limiting device according to any one of embodiments 6 to 9, wherein the worm wheel 6 is sleeved on the lead screw 4, and the output shaft 5 is engaged with the steering nut 1. The worm wheel 6 is sleeved on the screw rod 4, the motor 8 drives the worm wheel 6 to rotate through the worm 7, the worm wheel 6 rotates to drive the screw rod 4 to rotate, the screw rod 4 drives the screw rod nut 2 to axially move, and the screw rod nut 2 drives the steering nut 1 to axially move under the fixation of the positioning piece 3, so that the output shaft 5 is driven to move.

The present invention and its embodiments have been described above schematically, and the description is not limited thereto, and what is shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. Therefore, if the person skilled in the art receives the teaching of the present invention, without departing from the inventive spirit of the present invention, the person skilled in the art should also design the similar structural modes and embodiments without creativity to the technical solution, and all shall fall within the protection scope of the present invention.

Claims

1. The utility model provides a nut stop device, its characterized in that establishes the steering nut at the screw-nut periphery including setting element, screw-nut and cover, the setting element includes location cap and the perpendicular locating lever that sets up with the location cap, the outer wall at steering nut is installed to the location cap, the one end and the location cap of locating lever are connected, the other end of locating lever passes steering nut and is connected with screw-nut, screw-nut ring is established on the lead screw, steering nut and output shaft meshing.

2. The nut limiting device according to claim 1, wherein the steering nut is provided with a positioning hole, the lead screw nut is provided with a groove at a position corresponding to the positioning hole, and the positioning rod passes through the positioning hole and is in fit connection with the groove.

3. The nut stop device of claim 2 wherein the diameter of the alignment cap is greater than the diameter of the alignment hole and the diameter of the alignment rod is less than the diameter of the alignment hole.

4. The nut limiting device according to claim 3, wherein an anaerobic adhesive layer formed by spraying anaerobic adhesive is arranged between the positioning rod and the positioning hole, and an anaerobic adhesive layer formed by spraying anaerobic adhesive is arranged between the positioning rod and the groove.

5. The nut limiting device of claim 1 wherein a cavity is provided between the feed screw nut and the steering nut.

6. The nut limiting device according to claim 5, further comprising a screw, wherein the steering nut comprises a first body and limiting plates which are arranged at two ends of the first body and are perpendicular to the first body, the screw nut comprises a second body and end faces which are arranged at two ends of the second body and are perpendicular to the second body, a cavity is formed between the first body and the second body, the limiting plates and the end faces are provided with holes for the screw to pass through, and the inner side walls of the limiting plates and the outer side walls of the end faces abut against each other.

7. The nut limiting device according to claim 6, wherein the first body is provided with a positioning hole, and the second body is provided with a groove at a position corresponding to the positioning hole, or the limiting plate is provided with a positioning hole, and the end surface is provided with a groove at a position corresponding to the positioning hole.

8. The nut limiting device according to claim 6, wherein steel balls are arranged between the steering nut and the lead screw, and the steel balls roll in a ball groove formed by the lead screw and the steering nut.

9. The nut limiting device according to claim 8, wherein the screw rod is provided with a plurality of reversers, the reversers are provided with ball returning grooves for steel balls to pass through, and the open ends of the ball returning grooves face the screw rod.

10. An electric power steering device is characterized by comprising an output shaft, a worm wheel, a worm matched with the worm wheel, a motor connected with the worm, and a nut limiting device according to any one of claims 6 to 9, wherein the worm wheel is sleeved on a screw rod, and the output shaft is meshed with a steering nut.