Electric push rod

Abstract

The invention relates to an electric push rod which provides a simpler and more stable push rod driving mode. According to the implementation scheme, the electric push rod comprises a driving device and an output shaft, and the output shaft is connected with the driving device; the screw rod is connected with the output shaft, and the screw rod is provided with an external thread; and an internal thread is arranged in the push rod sleeve, and the internal thread is matched with the external thread. When the output shaft rotates, the lead screw rotates along with the output shaft, and when the lead screw rotates, the push rod sleeve linearly moves in the axial direction of the lead screw. The beneficial effects are that the motor drives the output shaft to rotate so as to drive the screw rod to rotate; in the rotating process of the lead screw, the push rod sleeve linearly moves on the lead screw through interaction of the external threads on the surface of the lead screw and the internal threads in the push rod sleeve. The linear motion of the push rod sleeve is further converted into the linear motion of the push rod, finally the rocker arm is pushed to rotate around the fixed point, and the locking or unlocking function of the parking space lock is achieved.

Description

Technical Field

[0001] The present application relates to a push rod, and in particular to a push rod driven by a motor. Background Art

[0002] With the acceleration of urbanization, the rapid increase in the number of cars has made parking problems increasingly serious. In order to effectively manage and utilize limited parking resources, parking locks, as an automated control device, have been widely used in various parking lots and private parking spaces. Traditional parking locks mainly achieve locking and unlocking functions by directly driving the rotation of the rocker arm through a motor, but this design has certain limitations in stability and accuracy, especially when facing complex environments or external forces, its stability and durability are easily challenged.

[0003] In recent years, with the continuous progress of mechanical transmission technology and motor control technology, the design of parking locks has tended to be more intelligent and refined. Among them, the design of using a push rod to drive the rocker arm has gradually become a new trend. This design not only improves the driving efficiency and stability of the parking lock, but also enhances its ability to resist external interference, thereby extending the service life of the parking lock.

[0004] In the existing push rod drive technology, a common design is to connect the output shaft of the motor to the push rod through a transmission mechanism (such as gears, belts, etc.), and then the push rod drives the rocker arm to rotate. However, this design often has problems such as complex structure, low transmission efficiency, and high maintenance cost. In order to overcome these shortcomings, the industry began to explore a simpler and more stable push rod drive method. Summary of the invention

[0005] The invention object of the present application is to provide an electric push rod driving device for a parking lock, providing a simpler and more stable push rod driving method.

[0006] In order to achieve the above-mentioned purpose, the present application provides such a solution: an electric push rod, including a driving device, including an output shaft, the output shaft is connected to the driving device; a screw rod, the screw rod is connected to the output shaft, the screw rod is provided with an external thread; a push rod sleeve, the push rod sleeve is provided with an internal thread, the internal thread is adapted to the external thread. When the output shaft rotates, the screw rod rotates accordingly, and when the screw rod rotates, the push rod sleeve moves linearly along the axial direction of the screw rod.

[0007] Furthermore, the driving device is a motor, or a reduction motor.

[0008] Furthermore, a bracket is provided, and the driving device is fixed to the bracket.

[0009] Furthermore, the first section of the output shaft is of a special shape, the first section of the screw rod is provided with an embedding hole, the shape of the embedding hole is adapted to the shape of the first section of the output shaft, and the first section of the output shaft extends into the embedding hole of the screw rod to be adapted and clamped.

[0010] Furthermore, the first section of the output shaft is a cylinder, the cross section of which is an arc surface, a triangle, a square or a rectangle, and the embedding hole of the screw rod is adapted to the shape of the first section of the output shaft.

[0011] Furthermore, a retaining ring is arranged in the bracket, the first section of the output shaft is embedded in the first section of the screw rod, the first section of the screw rod is inserted into the retaining ring, the retaining ring and the screw rod are provided with through holes, and bolts fix the screw rod and the retaining ring through the through holes.

[0012] Furthermore, a bracket, the driving device is fixed to the bracket; a retaining ring, the retaining ring is arranged in the bracket, the first section of the output shaft is embedded in the first section of the screw rod, the first section of the screw rod is inserted into the retaining ring, the retaining ring and the screw rod are provided with through holes, and bolts fix the screw rod and the retaining ring through the through holes.

[0013] The beneficial effect of the present application is that the output shaft is driven to rotate by the motor, thereby driving the screw to rotate. During the rotation of the screw, the external thread on its surface interacts with the internal thread inside the push rod sleeve, causing the push rod sleeve to produce linear motion on the screw. The linear motion of the push rod sleeve is further converted into the linear motion of the push rod, which ultimately drives the rocker arm to rotate around its fixed point, thereby realizing the locking or unlocking function of the parking lock. The problems of stability and precision of traditional parking locks are solved, and the manufacturing cost and maintenance cost of the parking lock are reduced by simplifying the transmission structure and improving the transmission efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a general schematic diagram of this application;

[0015] Figure 2 This is an exploded diagram of the present application;

[0016] Figure 3 A cross-sectional view of the present application;

[0017] Figure 4 This is a schematic diagram of the dual output of the output shaft of this application;

[0018] Figure 5 This is a schematic diagram of the output shaft structure in this application;

[0019] Figure 6 It is a schematic diagram of the screw rod structure in this application;

[0020] Figure 7 It is a cross-sectional view of the push rod in this application. DETAILED DESCRIPTION

[0021] The present application will be further described below in conjunction with the accompanying drawings.

[0022] The present application relates to an electric push rod mainly used in a parking lock rocker arm driving device. The device uses a motor to drive the output shaft, and a push rod is set through a unique drive mechanism screw rod to achieve precise control of the push rod. This design not only simplifies the transmission structure and improves the transmission efficiency, but also enables the push rod to more stably push the rocker arm to rotate.

[0023] like Figure 1 and Figure 2 and Figure 3 As shown, the overall structure of the electric push rod of the present application is specifically described.

[0024] The driving device of the electric push rod of the present application is a motor 10 and a reducer 11. The reducer 11 increases the driving torque and improves the driving ability of the motor. Of course, it can also be driven directly by the motor 10. The reducer 11 is generally composed of a plurality of meshing gears, and the motor 10 and the reducer 11 are fixed on a bracket 12.

[0025] The output shaft 14 is fixedly connected to the center of the output gear 13 of the reducer 11. When the output gear 13 rotates, the output shaft 14 can rotate accordingly. The first section of the output shaft 14 is embedded in the screw rod 30. The first section of the output shaft 14 is irregular and fits the irregular hole of the screw rod 30. The irregular shape design allows the screw rod 30 to rotate with the output shaft 14 without sliding in the radial direction. The outer sleeve of the screw rod 30 is provided with a screw rod sleeve 35.

[0026] The inner surface of the push rod sleeve 40 is provided with an internal thread 42, and the other end is provided with a through hole 41, which is used to connect with the rocker mechanism of the parking lock. The surface of the screw rod 30 is provided with an external thread 31, which is adapted to the internal thread 42 of the push rod sleeve.

[0027] The retaining ring 20 is located in the bracket 12, and the output shaft 14 and the screw rod 30 pass through it. The retaining ring 20 is provided with a through hole 21, and the screw rod 30 is provided with a through hole 32. The bolt 22 passes through the through hole 21 and the through hole 32 and then abuts against the output shaft 14. The retaining ring 20 and the bolt 22 can fix the screw rod 30 in the axial direction to prevent the screw rod 30 from moving in the axial direction.

[0028] The baffle 23 is sleeved on the outside of the screw rod 30, located outside the bracket 12, and fixed on the bracket by screws.

[0029] like Figure 4 FIG. 2 is a schematic diagram of another embodiment of the present application showing a dual output output shaft.

[0030] The parking lock rocker arm is generally provided with two arms. If one end of the output shaft 14 outputs a drive, one arm of the rocker arm can be driven to rotate. Since the rocker arm is generally designed as an integral unit, the entire rocker arm is driven to rotate. In this embodiment, the other end of the output shaft 14A can also be designed to drive the screw rod to rotate. The screw rod and other parts are not shown, and are also used to drive the other arm to rotate. In this way, the two arms can be driven to rotate at the same time. This design can be used for the needs of different parking lock models, and this design is also the invention intention of this application.

[0031] like Figure 5 , which is a schematic diagram of the output shaft of the present application, Figure 6 This is a schematic diagram of the structure of the screw rod of this application.

[0032] The output shaft 14 and the screw rod 30 cooperate with each other and are described here together.

[0033] The output shaft 14 has a raised ring 142 in the middle, and the second section 141 and the first section 143 are cylindrical with a horizontal section 144 having a circular arc cross section.

[0034] The second section of the screw rod 30 is provided with an external thread 31, which is adapted to the internal thread of the push rod sleeve 40. The first section of the screw rod 30 is provided with a special-shaped hole 33, which is adapted to the shape of the first section 143 of the output shaft. For specific matching, please refer to the attached Figure 3 When the output shaft 14 rotates, the screw rod 30 also rotates. The adaption connection between the screw rod 30 and the output shaft 14 ensures that when the two rotate, the screw rod 30 does not slide along the radial direction of the output shaft 14, but rotates together. The shape of the first section 143 of the output shaft 14 can be other irregular shapes, such as rectangle, triangle, semicircle, etc., and the special-shaped hole 33 of the screw rod is adapted to the shape, and the cooperation with each other satisfies that the screw rod 30 cannot slide along the radial direction of the output shaft 14.

[0035] The first section of the screw rod 30 is also provided with a thread 34 , and the thread 34 is located on the inner surface of the retaining ring 23 .

[0036] The screw rod 30 is also provided with a through hole 32, which is aligned with the through hole 21 of the retaining ring 20 during assembly, so that the bolt 22 passes through the two through holes and directly reaches the output shaft 14. Since the retaining ring 20 is arranged in the bracket 12, the screw rod 30 is prevented from being displaced in the axial direction when it rotates.

[0037] like Figure 7 , which is a schematic structural diagram of the push rod sleeve 40 of the present application.

[0038] A through hole 41 is provided at one end of the push rod sleeve 40, which is used to connect with the rocker arm mechanism. An internal thread 42 is provided inside the other end, and the internal thread 42 is adapted to the external thread 31 of the screw rod 30. When the screw rod 30 rotates, under the action of the thread, the push rod sleeve 40 moves in a straight line along the axial direction, and the direction of rotation determines whether the push rod sleeve 40 moves forward or backward.

[0039] After receiving the control signal, the motor starts to drive the output shaft 14 to rotate, thereby driving the screw rod 30 to rotate. During the rotation process, the screw rod 30 interacts with the internal thread 42 inside the push rod sleeve 40 through the external thread 31 on its surface, so that the push rod sleeve 40 generates linear motion on the screw rod 30. The linear motion of the push rod sleeve 40 is further converted into the linear motion of the push rod, and finally drives the rocker arm to rotate around its fixed point, thereby realizing the locking or unlocking function of the parking lock.

[0040] This design not only solves the problems of stability and precision of traditional parking locks, but also reduces the manufacturing and maintenance costs of parking locks by simplifying the transmission structure and improving transmission efficiency. At the same time, because the connection between the push rod and the rocker arm adopts a more stable structure, the parking lock can maintain better stability and durability when subjected to external forces.

Claims

1. An electric push rod, comprising a driving device, characterized in that: include an output shaft connected to the driving device; A screw rod, the screw rod is connected to the output shaft and the screw rod is provided with an external thread; A push rod sleeve, wherein the push rod sleeve is provided with an internal thread, and the internal thread is adapted to the external thread; When the output shaft rotates, the screw rod rotates accordingly, and when the screw rod rotates, the push rod sleeve moves linearly along the axial direction of the screw rod.

2. The electric push rod according to claim 1, characterized in that: The driving device is a motor, or a reduction motor.

3. The electric push rod according to claim 1, characterized in that: A bracket, wherein the driving device is fixed to the bracket.

4. The electric linear actuator according to claim 1, characterized in that: The first section of the output shaft is of a special shape, and the first section of the screw rod is provided with an embedding hole, the shape of the embedding hole is adapted to the shape of the first section of the output shaft, and the first section of the output shaft extends into the embedding hole of the screw rod and is adapted and clamped.

5. The electric push rod according to claim 4, characterized in that: The first section of the output shaft is a cylinder, and its cross section is an arc surface, a triangle, a square or a rectangle. The embedding hole of the screw rod is adapted to the shape of the first section of the output shaft.

6. The electric push rod according to claim 3, characterized in that: A retaining ring is arranged in the bracket, the first section of the output shaft is embedded in the first section of the screw rod, the first section of the screw rod is inserted into the retaining ring, the retaining ring and the screw rod are provided with through holes, and bolts are passed through the through holes to fix the screw rod and the retaining ring.

7. The electric linear actuator according to claim 5, characterized in that: a bracket, the driving device being fixed to the bracket; A retaining ring is arranged in the bracket, the first section of the output shaft is embedded in the first section of the screw rod, the first section of the screw rod is inserted into the retaining ring, the retaining ring and the screw rod are provided with through holes, and bolts are passed through the through holes to fix the screw rod and the retaining ring.

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