Electric driving device with emergency disengagement function

Abstract

An electric driving device with an emergency disengagement function is characterized by comprising a shell, a worm gear, a worm, a disengagement base, a disengagement arm and a secondary gear, the disengagement base is arranged on a first shaft in a sleeving mode and located at the upper end of the worm gear, and the upper end of the disengagement base is provided with a spiral first inclined face; the disengagement arm is arranged on the first shaft in a sleeved mode and located at the upper end of the disengagement base, the disengagement arm is provided with a wrenching part extending out of the shell, the lower end of the disengagement arm is provided with a spiral second inclined face, and when the disengagement arm is in a rotating state, the second inclined face and the first inclined face are matched to drive the disengagement base to move downwards, and then the worm wheel is driven to move downwards. A clutch structure matched with a disengagement base and a disengagement arm is arranged in the device, emergency disengagement of the device is completed, and the self-locking characteristic of a worm gear and a worm can be achieved; in addition, after emergency disengagement is completed, self-resetting can be achieved, and normal work can be achieved after recovery.

Description

Technical Field

[0001] The utility model relates to a driving device for a vehicle door lock, in particular to a driving device which can be released in an emergency. Background Art

[0002] With the advancement of intelligent technology in automobile products, the electrification and intelligence of automobiles have become extremely popular. As an intelligent executive component, electric drive devices are the most popular. Taking the intelligent door lock of a car (electrically attracted and electrically opened) as an example, its drive device can be divided into an integrated type and a split type. The split drive device is connected to the lock block through a wire cable, and the wire cable pulls the lever mechanism of the door lock to realize the electric attraction and opening of the door. Traditional drive devices basically use a motor plus a worm gear drive. Because the worm gear transmission has a self-locking characteristic, when the motor is powered off or damaged during operation, if there is no emergency disengagement mechanism on the lock block, it may directly lead to the failure of the manual opening function of the door lock and the problem that the door cannot be opened normally. To solve this problem, a clutch structure needs to be made on the lock body. The common clutch structure will result in a complex lock body structure and low versatility, and can only be used for specific vehicles. Therefore, it is necessary to improve Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a compact electric drive device with a clutch structure in view of the above technical status, which can be opened in an emergency.

[0004] The utility model solves the above technical problems by adopting the following technical solution: an electric drive device with emergency release function, characterized in that it includes

[0005] a housing having a content cavity, the content cavity being provided with a first axis;

[0006] A worm wheel is rotatably disposed in the housing through the first shaft and is axially movable, and the worm wheel has helical teeth and straight teeth in the length direction;

[0007] A worm, rotatably disposed on the housing and meshing with the helical teeth of the worm wheel;

[0008] A disengagement seat is sleeved on the aforementioned first shaft and located at the upper end of the worm gear, and the upper end of the disengagement seat has a spiral first inclined surface;

[0009] A disengagement arm is sleeved on the aforementioned first shaft and is located at the upper end of the disengagement seat. The disengagement arm has a pull portion extending out of the housing. The lower end of the disengagement arm has a spiral second inclined surface. When the aforementioned disengagement arm is in a rotating state, the aforementioned second inclined surface cooperates with the first inclined surface to drive the disengagement seat to move downward, thereby driving the worm gear to move downward.

[0010] A first reset member is disposed in the housing and always forces the worm gear to maintain a tendency to move toward the release seat;

[0011] A second reset member, disposed in the housing and acting on the release arm; and

[0012] The secondary gear is rotatably arranged in the aforementioned housing and is meshed with the spur teeth of the worm gear for transmission.

[0013] Preferably, the housing comprises a lower shell and an upper shell assembled on the lower shell.

[0014] Furthermore, the electric drive device also includes a motor arranged in the housing, and a power output end of the motor is connected to the worm.

[0015] Preferably, the first reset member is a compression spring sleeved on the first shaft, the bottom end of the compression spring abuts against the inner wall of the outer shell, and the upper end of the compression spring abuts against the worm gear.

[0016] Furthermore, the housing has a positioning groove for arranging the first resetting member.

[0017] Preferably, the second reset member is a tension spring, one end of which is connected to the release arm, and the other end of which is connected to the inner wall of the housing.

[0018] Compared with the prior art, the advantages of the utility model are: the driving device has the advantages of a large worm gear transmission speed ratio, a compact structure and a strong load-bearing capacity. At the same time, a clutch structure composed of a disengagement seat and a disengagement arm is arranged inside the driving mechanism to complete an emergency disengagement device, which can solve the self-locking characteristics of the worm gear; and after completing the emergency disengagement, it can reset itself and can work normally after recovery. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of an embodiment.

[0020] Figure 2 for Figure 1 Exploded diagram of .

[0021] Figure 3 for Figure 2 An enlarged schematic diagram of another angle of view of the middle release arm.

[0022] Figure 4 It is a schematic diagram of the internal structure coordination of the embodiment.

[0023] Figure 5 It is a schematic diagram of the embodiment in the emergency release state. DETAILED DESCRIPTION

[0024] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0025] like Figure 1 , Figure 2 and Figure 4 As shown, the electric drive device in this embodiment includes a housing 1, a worm wheel 2, a worm 8, a disengagement seat 3, a disengagement arm 4, a first reset member 6, a second reset member 5, a secondary gear 7 and a motor 81.

[0026] The housing 1 has an inner cavity, and the inner cavity is provided with a first shaft 61. Specifically, the housing 1 in this embodiment includes a lower housing 12 and an upper housing 11 assembled on the lower housing 12. The lower housing 12 has a positioning groove 13 for the first reset member 6 to be provided.

[0027] The worm wheel 2 is rotatably disposed in the housing 1 through the first shaft 61 and can move axially. The worm wheel 2 has helical teeth 21 and straight teeth 22 in the length direction; the worm 8 is rotatably disposed on the housing 1 and meshes with the helical teeth 21 of the worm wheel 2 for transmission; the motor 81 is disposed in the housing 1, and the power output end of the motor 81 is connected to the worm 8.

[0028] The disengagement seat 3 is sleeved on the first shaft 61 and located at the upper end of the worm gear 2, and the upper end of the disengagement seat 3 has a spiral first inclined surface 31; the disengagement arm 4 is sleeved on the first shaft 61 and located at the upper end of the disengagement seat 3, and the disengagement arm 4 has a pull portion 42 extending out of the housing 1, combined with Figure 3 As shown, the lower end of the disengagement arm 4 has a spiral second inclined surface 41. When the disengagement arm 4 is in a rotating state, the second inclined surface 41 cooperates with the first inclined surface 31 to drive the disengagement seat 3 to move downward, thereby driving the worm gear 2 to move downward.

[0029] The first reset member 6 is arranged in the outer shell 1 and always forces the worm wheel 2 to maintain a tendency to move closer to the disengagement seat 3; the first reset member 6 in this embodiment is a compression spring sleeved on the first shaft 61, the bottom end of the compression spring abuts against the inner wall of the outer shell 1, and the upper end abuts against the worm wheel 2.

[0030] The second reset member 5 is arranged in the housing 1 and acts on the disengagement arm 4. In this embodiment, the second reset member 5 is a tension spring, one end of which is connected to the disengagement arm 4, and the other end is connected to the inner wall of the housing 1.

[0031] The secondary gear 7 is rotatably disposed in the housing 1 through the second shaft 71 and meshes with the spur teeth 22 of the worm gear 2. The secondary gear 7 can be connected to the next gear transmission or other mechanism to complete the drive output to the load.

[0032] like Figure 1 As shown, when working, the motor rotates forward, drives the turbine through the worm, and the turbine drives the secondary gear transmission, gradually amplifying the motor force torque and driving the load to move in the forward direction through the final transmission mechanism. At this time, the axial force of the turbine is transmitted to the upper and lower shells through the disengagement seat and the disengagement arm to achieve internal balance, so it can drive a larger load.

[0033] The motor reverses, and the worm drives the turbine to rotate. The turbine drives the secondary gear transmission, gradually amplifying the motor torque and driving the load to move in the backward direction through the final transmission mechanism. At this time, the axial force of the turbine and the elastic force of the first reset member become a pair of action and reaction forces. The reverse driving force of the driving mechanism is related to the elastic force of the first reset member.

[0034] Combination Figure 5 As shown, if the motor is powered off or fails during the process of driving the load, the load is in a state where it cannot move forward or backward due to the self-locking characteristics of the worm gear, and a fault commonly known as "mechanism stuck" occurs. At this time, the disengagement arm is moved with the help of external force, and the disengagement seat and the worm gear are driven to move downward along the axial direction of the first axis, so that the worm gear is separated from the worm gear, and the self-locking relationship of the worm gear is released, so that the movement of the load is not constrained by the present drive device. The load is dragged by external force, and the load can drive the secondary gear to rotate freely, so that the load can be reset and the emergency disengagement function can be realized. After the emergency disengagement is completed, the drive mechanism is in a state of being free of force. Under the action of the spring force of the first reset member and the second reset member, the disengagement arm, the disengagement seat and the worm gear move upward along the axial direction of the first axis to achieve reset. After power is restored, the drive mechanism can work normally.

[0035] When the electric device encounters a sudden power outage or motor damage during operation, the emergency disengagement mechanism of the drive device can be pulled up and the worm gear can be separated, thereby releasing the self-locking feature of the drive device and releasing the working stroke of the drive mechanism to pull the load, thereby avoiding the drive mechanism locking the load's free movement space.

Claims

1. An electric drive device with emergency release function, characterized in that include A housing (1) having an inner cavity, wherein the inner cavity is provided with a first shaft (61); A worm wheel (2) is rotatably disposed in the housing (1) via the first shaft (61) and is axially movable, and the worm wheel (2) has helical teeth (21) and straight teeth (22) in the length direction; A worm (8) is rotatably disposed on the housing (1) and meshes with the helical teeth (21) of the worm wheel (2) for transmission; A disengagement seat (3) is sleeved on the aforementioned first shaft (61) and is located at the upper end of the worm gear (2), and the upper end of the disengagement seat (3) has a spiral first inclined surface (31); A disengagement arm (4) is sleeved on the aforementioned first shaft (61) and is located at the upper end of the disengagement seat (3). The disengagement arm (4) has a pull portion (42) extending out of the housing (1). The lower end of the disengagement arm (4) has a spiral second inclined surface (41). When the aforementioned disengagement arm (4) is in a rotating state, the aforementioned second inclined surface (41) cooperates with the first inclined surface (31) to drive the disengagement seat (3) to move downward, thereby driving the worm gear (2) to move downward. A first reset member (6) is disposed in the housing (1) and always forces the worm wheel (2) to maintain a tendency to move toward the release seat (3); A second resetting member (5) is disposed in the housing (1) and acts on the release arm (4); and The secondary gear (7) is rotatably disposed in the aforementioned housing (1) and meshes with the spur teeth (22) of the worm gear (2) for transmission.

2. The electric drive device with emergency release function according to claim 1, characterized in that The housing (1) comprises a lower housing (12) and an upper housing (11) assembled on the lower housing (12).

3. The electric drive device with emergency release function according to claim 1, characterized in that The electric drive device also includes a motor (81) disposed in the housing (1), and a power output end of the motor (81) is connected to the worm (8).

4. The electric drive device with emergency release function according to claim 1, characterized in that The first reset member (6) is a compression spring sleeved on the first shaft (61), the bottom end of the compression spring abuts against the inner wall of the outer shell (1), and the upper end of the compression spring abuts against the worm gear (2).

5. The electric drive device with emergency release function according to claim 4, characterized in that The housing (1) has a positioning groove (13) for arranging the first restoring member (6).

6. The electric drive device with emergency release function according to claim 1, characterized in that The second reset member (5) is a tension spring, one end of which is connected to the release arm (4) and the other end of which is connected to the inner wall of the housing (1).

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