Screw rod fixing structure of automobile door actuator

Abstract

The utility model relates to an automobile door actuator, in particular to a screw rod fixing structure of the automobile door actuator. A lead screw fixing structure of an automobile door actuator comprises a shell, a lead screw and a lead screw nut, the lead screw nut is arranged on the lead screw in a matched mode and connected with one end of a movable arm, the other end of the movable arm is connected with an automobile body, and the end, used for receiving torque output by a driver, of the lead screw is directly or indirectly fixed to the shell in a rotating mode. The shell is provided with a fixing part used for fixing a matching piece made of elastic materials, a connecting piece is fixed to the fixing part, and the other end of the lead screw is rotationally fixed to the connecting piece. The utility model has the advantages that the shaking requirement of the lead screw can be met, the fixing stability of the shell can be ensured, the requirement on the production process of the shell is lower, and the production cost is lower.

Description

Technical Field

[0001] The utility model relates to an automobile door actuator, in particular to a screw rod fixing structure of the automobile door actuator. Background Art

[0002] The existing automobile door actuator includes a servo motor as a driver, a screw and screw nut for transmitting torque, and a movable arm for opening and closing the door. Both ends of the screw are fixed to the housing through bearings. The screw receives torque to rotate so that the screw nut moves along the screw axis, thereby driving the movable arm fixed to the screw nut to move, thereby realizing the opening and closing of the door, such as the automobile side door actuator mechanism disclosed in the Chinese patent application number 202221007232.6. However, the screw will be subjected to radial force when rotating, and the end of the screw away from the motor is prone to shaking, resulting in increased noise, and the screw will bend after long-term use, and it is easy to get stuck when used.

[0003] The patent with application number 202321562132.4 discloses an automatic side door drive mechanism for a car, including a power unit, an actuator unit, a transmission unit, a shell, a fixing part and a door mounting bracket. The shell is made of elastic material and is fixedly mounted on the fixing part. The actuator unit includes a screw rod and a screw rod nut screwed to the screw rod. The first end of the screw rod is slidably placed in the shell, and the first end of the screw rod is fixedly connected to the limit nut. The second end of the screw rod is connected to the car body. Under the action of the screw rod nut, the screw rod reciprocates along its axial direction to realize the opening or closing of the car door.

[0004] The shell of the above scheme is made of elastic material, and the shell can be deformed to meet the swing requirements of the screw rod. However, the shell of the above scheme is made of rubber material, which will cause the following defects: (1) The shell needs to be assembled and fixed with the fixing parts and other components, and the stability of the shell fixing is relatively high. The bonding with the fixing parts made of metal materials is poor, there is elastic deformation at the connection of the shell, there is a possibility of cracking, and the fixing stability between the shell and the fixing parts and other components is not good; (2) The large-volume shell is made of rubber material as a whole, which is easy to cause problems such as high production process requirements and high production costs due to poor fluidity of the rubber or uneven baking of the injection molding machine. Utility Model Content

[0005] The utility model aims to provide a screw rod fixing structure for an automobile door actuator which can meet the screw rod shaking requirement, ensure the fixing stability of a shell, have low requirements on the shell production process and low production cost.

[0006] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a screw fixing structure of a car door actuator, comprising a housing, a screw and a screw nut, wherein the screw nut is fitted on the screw and connected to one end of a movable arm, the other end of the movable arm is connected to the vehicle body, one end of the screw for receiving the torque output by the driver is directly or indirectly rotationally fixed to the housing, the housing has a fixing portion for fixing a mating piece made of elastic material, a connecting piece is fixed at the fixing portion, and the other end of the screw is rotationally fixed to the connecting piece.

[0007] The utility model provides a matching piece made of elastic material to absorb the radial force exerted on the screw rod, thereby avoiding the screw rod from shaking as much as possible, reducing the noise when the door actuator of the utility model is used, and improving the use stability of the utility model.

[0008] The utility model fixes a fitting made of elastic material on the shell, instead of making the entire shell of elastic material. The shell can be made of metal or plastic used for the shell of any existing door actuator, which can ensure the fixing stability of the shell itself, and does not need to consider the problem of high process requirements and high production costs caused by the different materials of the shell and the connected part. Among them, the fitting can be made of rubber material. The part of the shell used to fix the fitting is the fixing part. Since the fitting is small and the fitting does not need to be connected and fixed with the car body, the process requirements for fixing the fitting and the shell are low. The fixing methods of the shell and the fitting are various, and various fixing methods such as fastener fixing, snap fixing, glue fixing, etc. can be adopted. Among them, the connecting part can be a bearing or a sleeve, which can be made of metal or high-strength plastic material; at the same time, the setting of the connecting part can reduce the axial length of the fitting as much as possible, and reduce the consumables of the fitting while ensuring the connection stability.

[0009] Preferably, the mating part includes an axial first part and an axial second part, the fixed part is provided with a fixing groove for mating with the axial second part, mutually mating positioning grooves and a positioning protrusion extending into the positioning groove are provided between the circumferential outer wall of the axial second part and the wall of the fixing groove, the axial first part is located on the inner side of the fixed part of the shell, and the end face of the axial first part is in contact with or adjacent to the inner surface of the fixed part.

[0010] The utility model uses the fixed part of the shell to axially limit the axial part of the matching piece, and limits the rotation of the matching piece through the positioning protrusion and the positioning groove, so as to realize the positioning of the matching piece and improve the stability during use. The matching piece can be tightly fitted in the fixing groove of the fixed part of the shell, or a threaded hole can be set at the fixing part and matched with a locking bolt, or glue can be used to improve the connection and fixing strength between the matching piece and the shell.

[0011] Preferably, the housing comprises a first housing portion located on the circumferential side of the screw rod and a second housing portion located on the axial side of the screw rod, and the fixing portion is arranged on the second housing portion.

[0012] The above arrangement facilitates the assembly of the mating parts. When assembling the mating parts, first assemble and fix the screw rod and the first part of the housing, and then fix the connecting piece and the mating part or the screw rod, insert the mating part on the second part of the housing, and then align the mating part with the screw rod (and align the first part of the housing with the second part of the housing), and then fix the second part of the housing with the first part of the housing.

[0013] Preferably, the second axial portion has an annular groove extending along the axial direction, and the mating piece has a mating groove for fixing the connecting piece, and the annular groove is located on the circumferential outside of the mating groove.

[0014] The axial thickness of the fitting is reduced by the annular groove, so that the fitting can have a wobble at the connecting piece, and the wobble amplitude of the fitting at the connecting piece can be increased, so as to further reduce noise and improve the stability in use.

[0015] Preferably, a linkage part is provided on the outer sleeve of one end of the screw rod away from the mating part, and a linkage protrusion and a linkage groove that cooperate with each other are provided between the inner wall of the linkage part and the circumferential outer wall of the screw rod. The outer wall of the linkage part is provided with a tooth structure to receive the torque output by the driver, and the linkage part is rotatably fixed to the housing through a bearing.

[0016] The screw rod of the utility model is not directly fixed to the housing by bearings, but is fixed to the screw rod by fixing a linkage part on the screw rod, and the linkage part is fixed to the housing by bearings, thereby indirectly fixing the screw rod. When there is a certain gap between the linkage part and the screw rod, or the linkage part is made of a material with lower rigidity, the fixing rigidity of the end of the screw rod that receives the torque can be made smaller, and the end of the screw rod that receives the torque can also shake slightly. Or the diameter of the screw rod can be increased by the linkage part, so that a larger bearing can be used to improve the stability of rotation fixation; the linkage part can be injection molded on the screw rod.

[0017] The utility model has the advantages of being able to meet the requirements for screw rod shaking, ensuring the fixing stability of the shell, having low requirements on the shell production process and low production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a cross-sectional view of the utility model.

[0019] Figure 2 It is a structural schematic diagram of the matching piece and the shell when the two parts of the utility model are fixed.

[0020] Figure 3 for Figure 1 Schematic diagram of the structure of the matching parts. DETAILED DESCRIPTION

[0021] The utility model is further described below based on the accompanying drawings and specific embodiments.

[0022] Depend on Figure 1 and Figure 2 As shown, this embodiment discloses a screw fixing structure of a car door actuator, including a housing 1, a screw 2 and a screw nut 3. The screw nut 3 is matched with the screw 2 and connected to one end of a movable arm 4. The other end of the movable arm 4 is connected to the vehicle body (not shown in the figure). Both ends of the screw 2 are rotatably fixed to the housing 1. The housing 1 has a fixing portion 10 for fixing a matching piece 5 made of elastic material. A connecting piece 6 is fixed at the fixing portion 10. One end of the screw 2 is used to receive the torque output by the driver 7, and the other end of the screw 2 is rotatably fixed to the connecting piece 6. Among them, the housing 1 of this embodiment is formed with a limiting structure for limiting the screw nut. The limiting structure can adopt any existing structure of an electric push rod for limiting the rotation of the screw nut 3 relative to the screw 2. The screw nut 3 is non-circular, and the inner edge shape of the cross section at the matching position of the housing 1 and the screw nut 3 is adapted to the outer edge shape of the screw nut 3. Among them, the driver 7 is a motor. Among them, the matching piece 5 of this embodiment is made of rubber material.

[0023] Depend on Figures 1 to 3 As shown, the mating piece 5 includes an axial first portion 51 and an axial second portion 52, the fixing portion 10 is provided with a fixing groove for matching with the axial second portion 52, the mating piece 5 is tightly fitted on the fixing portion 10, the fixing groove penetrates the fixing portion 10 inside and outside, and mutually matching positioning grooves and positioning protrusions extending into the positioning grooves are provided between the circumferential outer wall of the axial second portion 52 and the fixing groove wall, and at least three shell positioning protrusions 101 extending circumferentially inward are evenly distributed on the inner wall of the fixing groove, the axial second portion 52 has a mating piece positioning protrusion 521 corresponding to the shell positioning protrusion 101 one by one, and a positioning groove is formed between two adjacent shell positioning protrusions 101 and two adjacent mating piece positioning protrusions 521, each shell positioning protrusion 101 is located between two adjacent mating piece positioning protrusions 521, and each mating piece positioning protrusion 521 is located between two adjacent shell positioning protrusions 101.

[0024] The width of the first axial portion 51 is greater than the width of the second axial portion 52 and smaller than the inner diameter of the fixing groove. The first axial portion 51 is located inside the fixing portion 10 of the housing 1, and the end surface of the first axial portion 51 contacts the inner surface of the fixing portion 10. The second axial portion 52 has an annular groove 522 extending along the axial direction. The middle part of the matching piece 5 has a matching groove 53 with one end closed and the other end open for fixing the connecting piece 7. The annular groove 522 is located outside the matching groove 53 in the circumferential direction.

[0025] The connecting member 7 of this embodiment is sleeve-shaped, and the end of the screw rod 2 has a boss 20 (the end of the threaded tooth of the screw rod 2 is used as the boss) for limiting the sliding of the connecting member 7 to one side of the axial direction. The screw rod 2 of this embodiment and the connecting member 7 can be slidably matched, or can be tightly matched or threadedly fixed, and the fixing method can be selected according to actual needs. The connecting member 7 and the matching member 5 can rotate and slide relative to each other.

[0026] Depend on Figure 1 As shown, the housing 10 includes a housing portion 101 located on the circumferential side of the screw rod 2 and a housing portion 102 located on the axial side of the screw rod 2. The fixing portion 10 is arranged on the housing portion 102. The housing portion 102 is fixed to the housing portion 101 by fasteners. The housing portion 102 is plate-shaped.

[0027] A linkage part 8 is provided on the outer sleeve of one end of the screw rod 2 away from the matching part 5, and a linkage protrusion and a linkage groove that cooperate with each other are provided between the inner wall of the linkage part 8 and the circumferential outer wall of the screw rod 2. A tooth structure is provided on the outer wall of the linkage part 8 to receive the torque output by the driver 7. The linkage part 8 is rotatably fixed to the housing 1 through a bearing 81.

[0028] The utility model has the advantages of being able to meet the requirements for screw rod shaking, ensuring the fixing stability of the shell, having low requirements on the shell production process and low production cost.

Claims

1. A screw fixing structure for a car door actuator, comprising a housing, a screw and a screw nut, wherein the screw nut is fitted on the screw and connected to one end of a movable arm, the other end of the movable arm is connected to the vehicle body, and one end of the screw for receiving the torque output by the driver is directly or indirectly rotatably fixed to the housing, characterized in that: The housing has a fixing portion for fixing a matching piece made of an elastic material, a connecting piece is fixed to the fixing portion, and the other end of the screw rod is rotationally fixed to the connecting piece.

2. The screw rod fixing structure of the automobile door actuator according to claim 1, characterized in that: The mating part includes an axial first part and an axial second part, the fixed part is provided with a fixed groove for mating with the axial second part, and mutually mating positioning grooves and a positioning protrusion extending into the positioning groove are provided between the circumferential outer wall of the axial second part and the wall of the fixed groove, the axial first part is located on the inner side of the fixed part of the shell, and the end face of the axial first part is in contact with or adjacent to the inner surface of the fixed part.

3. The screw rod fixing structure of the automobile door actuator according to claim 2, characterized in that: The housing comprises a first housing portion located on the circumferential side of the screw rod and a second housing portion located on the axial side of the screw rod, and the fixing portion is arranged on the second housing portion.

4. The screw rod fixing structure of the automobile door actuator according to claim 2 or 3, characterized in that: The second axial portion has an annular groove extending in the axial direction, and the matching piece has a matching groove for fixing the connecting piece, and the annular groove is located on the circumferential outer side of the matching groove.

5. The screw rod fixing structure of the automobile door actuator according to claim 1, characterized in that: A linkage piece is provided on the outer sleeve of one end of the screw rod away from the mating piece, and a linkage protrusion and a linkage groove that cooperate with each other are provided between the inner wall of the linkage piece and the circumferential outer wall of the screw rod. A tooth structure is provided on the outer wall of the linkage piece to receive the torque output by the driver, and the linkage piece is rotatably fixed to the housing through a bearing.

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