Electric push rod

Abstract

The utility model 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 and the dramatic increase in the number of cars, parking has become an increasingly serious problem. To effectively manage and utilize limited parking resources, parking locks, as automated control devices, have become widely used in various parking lots and private parking spaces. Traditional parking locks primarily lock and unlock via a motor-driven swing arm. However, this design has limitations in stability and precision, especially in complex environments or under external forces, where stability and durability are easily challenged.

[0003] In recent years, with the continuous advancement of mechanical transmission and motor control technologies, parking lock designs have become increasingly intelligent and sophisticated. Among these, the use of push rods to drive rocker arms has become a new trend. This design not only improves the parking lock's driving efficiency and stability but also enhances its resistance to external interference, thereby extending its service life.

[0004] In existing actuator drive technology, a common design is to connect the motor's output shaft to the actuator through a transmission mechanism (such as gears or belts), which then drives the rocker arm to achieve rotation. However, this design often suffers from complex structure, low transmission efficiency, and high maintenance costs. To overcome these shortcomings, the industry has begun to explore simpler and more stable actuator drive methods. Utility Model Content

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

[0006] To achieve the above objectives, the present application provides a solution: an electric push rod comprising a drive device, an output shaft connected to the drive device, a screw connected to the output shaft, the screw having an external thread, and a push rod sleeve having an internal thread adapted to mate with the external thread. When the output shaft rotates, the screw rotates accordingly, and when the screw rotates, the push rod sleeve moves linearly along the screw shaft's axis.

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

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

[0009] Furthermore, the first section of the output shaft is special-shaped, 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 stuck.

[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 provided 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 generate 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. It solves the problems of stability and precision of traditional parking locks, and also reduces the manufacturing cost and maintenance cost of the parking lock by simplifying the transmission structure and improving the transmission efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is an overall schematic diagram of this application;

[0015] Figure 2 This is an explosion diagram of this 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 Schematic diagram of the screw rod structure in this application;

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

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

[0022] This application relates to an electric push rod primarily used in a parking lock rocker arm drive device. This device utilizes a motor to drive an output shaft, which is precisely controlled by a unique drive mechanism with a screw rod mounted on a push rod. This design not only simplifies the transmission structure and improves transmission efficiency, but also enables the push rod to more stably rotate the rocker arm.

[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 electric push rod of the present application is driven by 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. The motor 10 and the reducer 11 are fixed to a bracket 12.

[0025] Output shaft 14 is fixedly connected to the center of output gear 13 of reducer 11. When output gear 13 rotates, output shaft 14 rotates with it. The first section of output shaft 14 is embedded in screw rod 30. This section is irregularly shaped, matching the irregularly shaped hole in screw rod 30. This irregular shape allows screw rod 30 to rotate with output shaft 14 without radial slippage. A screw rod sleeve 35 surrounds screw rod 30.

[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 within the bracket 12, through which the output shaft 14 and the screw rod 30 pass. The retaining ring 20 has a through hole 21, and the screw rod 30 has 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 together can fix the screw rod 30 in the axial direction and prevent axial movement of the screw rod 30.

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

[0029] like Figure 4 FIG. 1 is a schematic diagram of another embodiment of the present application showing a dual output output shaft.

[0030] The parking lock rocker arm typically has two arms. If one end of the output shaft 14 is driven, it can drive one arm to rotate. Since the rocker arm is generally designed as an integral unit, this also drives the entire rocker arm to rotate. In this embodiment, the other end of the output shaft 14A can also be designed to drive a screw (not shown) to rotate, and is also used to drive the other arm to rotate. In this way, both arms can be driven to rotate simultaneously. This design can be used to meet the needs of different parking lock models and is also the inventive intent of this application.

[0031] like Figure 5 As shown, it is a schematic diagram of the output shaft of this application, Figure 6 This is a schematic diagram of the structure of the screw rod in this application.

[0032] The output shaft 14 and the screw rod 30 cooperate 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 an arc-shaped 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. This adaptive connection between the screw rod 30 and the output shaft 14 ensures that when the two rotate, the screw rod 30 does not slide radially along the output shaft 14, but rotates together. The first section 143 of the output shaft 14 can be shaped in an irregular manner, such as a rectangle, triangle, or semicircle, and the screw rod's shaped hole 33 is adapted to this shape. The two cooperate to ensure that the screw rod 30 does not slide radially along 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. When assembled, the through hole 32 is aligned with the through hole 21 of the retaining ring 20, so that the bolt 22 passes through the two through holes and directly reaches the output shaft 14. Since the retaining ring 20 is provided in the bracket 12, the screw rod 30 is prevented from axial displacement when rotating.

[0037] like Figure 7 , which is a schematic structural diagram of the push rod cover 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 to the rocker arm mechanism. An internal thread 42 is provided inside the other end, which 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 an axial straight line, and the direction of rotation determines whether the push rod sleeve 40 moves forward or backward.

[0039] After receiving the control signal, the motor begins to rotate the output shaft 14, which in turn drives the screw 30. During this rotation, the external threads 31 on the screw 30 interact with the internal threads 42 on the push rod sleeve 40, causing the push rod sleeve 40 to generate linear motion on the screw 30. This linear motion of the push rod sleeve 40 is further converted into linear motion of the push rod, ultimately driving the rocker arm to rotate about its fixed point, thereby locking or unlocking the parking lock.

[0040] This design not only solves the stability and precision issues of traditional parking locks, but also reduces manufacturing and maintenance costs by simplifying the transmission structure and improving transmission efficiency. Furthermore, the more robust connection between the push rod and the rocker arm ensures greater 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 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 linear actuator according to claim 1, characterized in that: The driving device is a motor or a reduction motor.

3. The electric linear actuator according to claim 1, characterized in that: 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 special-shaped, 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. The first section of the output shaft extends into the embedding hole of the screw rod and is adapted and stuck.

5. The electric linear actuator according to claim 4, characterized in that: 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.

6. The electric linear actuator 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 fixed to the screw rod and the retaining ring through the through holes.

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 fixed to the screw rod and the retaining ring through the through holes.

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