Door lock actuator

Abstract

The utility model discloses a door lock actuator which comprises a motor 1, an output transmission assembly 2 and a lock pin 3, the motor 1 controls the lock pin 3 through the output transmission assembly 2 so as to achieve locking and unlocking of a door lock, the output transmission assembly 2 comprises a worm 2.1, the worm 2.1 is connected to an output shaft 1.1 of the motor 1 in a circumferential limiting mode, and the output shaft 1.1 of the motor 1 is connected with the output shaft 1.1 of the motor 1. The output shaft 1.1 is sleeved with a self-adaptive adjusting sheet 4 which is used for self-adaptively adjusting the rotating state according to the transmission connection state of the worm, the output end of the motor 1 is provided with a bearing chamber 1.2 used for placing a bearing, the output shaft 1.1 is rotationally connected to the axis of the bearing chamber 1.2, and the self-adaptive adjusting sheet 4 is arranged between the worm 2.1 and the bearing chamber 1.2. According to the door lock actuator, abrasion of the worm is reduced, and the service life of the worm is guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of door locks, specifically a door lock actuator. Background Technology

[0002] In car refrigerator door locks and glove box door locks, a common door lock control device uses a motor and a worm gear transmission mechanism for control. However, in the transmission method of the worm gear transmission mechanism, the motor drives the worm to rotate. During the rotation of the worm, when the end of the worm close to the motor comes into contact with the bearing housing at the end of the motor, the worm will rub against the bearing housing, causing wear, which is not conducive to the long-term use of the worm. Summary of the Invention

[0003] The technical problem to be solved by this utility model is to provide a door lock actuator that reduces the wear of the worm gear and ensures the service life of the worm gear.

[0004] The technical solution adopted by this utility model to solve the above problems is as follows: a door lock actuator, including a motor, an output transmission assembly, and a locking pin. The motor controls the locking pin through the output transmission assembly to realize the locking and unlocking of the door lock. The output transmission assembly includes a worm gear, which is circumferentially limited and connected to the output shaft of the motor. An adaptive adjustment plate is sleeved on the output shaft to adaptively adjust the rotation state according to the transmission connection state of the worm gear. The output end of the motor is provided with a bearing chamber for placing a bearing. The output shaft is rotatably connected to the axis of the bearing chamber. The adaptive adjustment plate is located between the worm gear and the bearing chamber.

[0005] Compared with existing technologies, the advantages of this utility model are as follows: The bearing housing is part of the motor structure, and the motor is a standard component. The bearing housing is mainly machined by cutting the surface. To ensure low roughness of the bearing housing, additional machining beyond the standard component machining method is required, which is complex and costly. Under standard motor component conditions, the surface of the bearing housing is relatively rough and prone to burrs. When the worm and bearing housing are in contact, relative rotation occurs. Without the adaptive adjustment plate, the worm is prone to friction with the bearing housing, and the frictional force is large, which easily causes wear on the worm and affects its service life. However, with the design of the adaptive adjustment plate, when the transmission connection between the worm wheel and the worm is too tight, the worm can move towards the adaptive adjustment plate, thus creating a contacting state between the worm and the adaptive adjustment plate. The adaptive adjusting plate abuts against the bearing housing, and then the worm rotates relative to the adaptive adjusting plate during rotation. At this time, the adaptive adjusting plate abuts against the bearing housing without relative rotation. Utilizing the wear-resistant and lubricating properties of the adaptive adjusting plate, wear and friction on the worm are reduced. Furthermore, the design of the adaptive adjusting plate reduces the coefficient of friction between the worm and the contacting object. The contacting object changes from abutting against the motor housing or motor to abutting against the adaptive adjusting plate, thereby reducing the rotational frictional resistance of the worm and lowering the probability of worm jamming. When the worm wheel and worm are in a conventional transmission connection state, the worm will not form a tight abutment with the adaptive adjusting plate. Therefore, when the worm rotates, the adaptive adjusting plate will neither abut against the worm nor against the bearing housing. Instead, the grease, under its viscosity, rotates freely with the output shaft, avoiding long-term adhesion to the bearing housing and making replacement and disassembly difficult.

[0006] As an improvement of this utility model, the adaptive adjustment plate and the output shaft are fitted with a clearance fit, the minimum clearance of which is not less than 0.05mm. Through this improvement, the adaptive adjustment plate and the output shaft can easily form a state of relatively independent rotation. That is, the rotation of the output shaft will not necessarily drive the adaptive adjustment plate to rotate. The output shaft and the adaptive adjustment plate form a state of relatively unresisted rotation. Then, during the process of the output shaft driving the worm to rotate, if the worm and the adaptive adjustment plate abut against each other, the adaptive adjustment plate abuts against the bearing housing and is fixed on the end face of the bearing housing, and will not rotate with the rotation of the output shaft. When the worm and the adaptive adjustment plate form a gap, the adaptive adjustment plate will follow the output shaft to rotate due to the viscosity of the grease, but it will not rotate synchronously. This makes the adaptive adjustment plate have a high degree of freedom to meet the condition that the adaptive adjustment plate can adaptively adjust the rotation state according to the transmission connection state of the worm.

[0007] As an improvement of this utility model, in the standard drive state of the worm gear, a first adjustment gap is provided between the end of the worm gear near the motor and the adaptive adjustment plate. Through this improvement, in the output transmission assembly, the structure cooperating with the worm gear is a worm wheel, forming a worm wheel-worm gear transmission connection structure. In this worm wheel-worm gear transmission connection structure, the worm wheel exerts an axial force on the worm gear along the worm's axis. The greater the torque of the worm wheel-worm gear connection, the greater this axial force. Simultaneously, this axial force generates rotational friction on the worm gear, which is detrimental to its rotation. By setting the first adjustment gap, the worm gear can achieve self-adjustment during the transmission connection process. The axial adjustment space that adapts to the movement of the adaptive adjusting plate helps reduce axial force, thereby reducing rotational friction and preventing worm gear jamming. When the first adjustment gap still exists or the worm gear is just abutting against the adaptive adjusting plate, the adaptive adjusting plate still has a high degree of rotational freedom and is not affected by the worm gear. When the worm gear and the adaptive adjusting plate are tightly abutting, the adaptive adjusting plate is fixed on the end face of the bearing housing and rotates relative to the worm gear. Due to the low surface roughness of the adaptive adjusting plate, when the worm gear abuts against it, the friction is effectively reduced under the same axial force, thereby improving transmission efficiency and reducing the risk of jamming.

[0008] As an improvement of this utility model, the first adjustment gap is not less than 0.05mm. Through this improvement, firstly, it is ensured that the worm retains the rotational freedom of the adaptive adjustment plate during normal transmission connection. Secondly, it ensures that the first adjustment gap provides adjustment space for the worm to move axially, so as to avoid the worm getting stuck during rotation. However, it cannot have a significant impact on the transmission connection structure of the worm gear.

[0009] As an improvement of this utility model, the end of the worm gear away from the motor is rotatably connected in a fixed sleeve. Through this improvement, the rotational stability of the worm gear is achieved. In the worm gear transmission connection, the worm gear will form a radial force on the worm gear away from the center of the worm gear. If the material of the worm gear and worm is too soft, this radial force can easily cause the meshing of the worm gear and worm gear to deviate. In severe cases, tooth knocking will occur, resulting in jamming.

[0010] As an improvement of this utility model, in the standard drive state of the worm gear, a second adjustment gap is provided between the end of the worm gear near the fixed sleeve and the fixed sleeve. Through this improvement, the same adjustment requirement as the first adjustment gap can be met by setting the second adjustment gap, which allows the worm gear to have axial adjustment space to move towards the fixed sleeve during the transmission connection process, which helps to reduce axial force and thus reduce rotational friction.

[0011] As an improvement of this utility model, the second adjustment gap is not less than 0.05mm. Through this improvement, the second adjustment gap is guaranteed to provide adjustment space for the worm to move axially, but it cannot have a significant impact on the transmission connection structure of the worm gear.

[0012] As an improvement of this utility model, a worm shaft is provided on the axis of the worm, and the worm and the worm shaft are designed as an integral unit. The diameter of the worm shaft is not less than 1 / 2 of the root circle diameter of the worm teeth. Through this improvement, the strength of the worm shaft is guaranteed, the stability of the transmission center distance of the worm wheel and worm is guaranteed, so as to ensure the stability of the worm in use and avoid deformation or damage to the worm during the transmission connection process.

[0013] As an improvement of this utility model, the worm shaft and the output shaft are connected by a D-type plug-in interface structure for circumferential limiting connection. The end of the worm shaft that is inserted into the fixed sleeve is chamfered. Through this improvement, the circumferential limiting connection between the worm shaft and the output shaft is ensured by the D-type plug-in interface structure, that is, the circumferential limiting connection between the worm and the output shaft is ensured, and the transmission between the output shaft and the worm is guaranteed to be without relative rotation. The chamfer design on the worm shaft can reduce the contact area between the end of the worm shaft and the fixed sleeve, thereby reducing frictional resistance.

[0014] As an improvement of this utility model, the output transmission assembly further includes a worm wheel connected to the worm gear drive. The worm wheel is rotatably connected to a worm wheel shaft. The worm wheel includes worm wheel input teeth connected to the worm gear drive. The output transmission assembly also includes a rack connected to the side of the worm wheel away from the worm gear drive. The rack is located at one end of the locking pin. The worm wheel meshes with the rack through worm wheel input and output teeth. The root circle diameter of the worm wheel input teeth is larger than the root circle diameter of the worm wheel output teeth. The diameter of the worm wheel shaft is not less than 3 / 5 of the root circle diameter of the worm wheel output teeth. Through this improvement, the strength of the worm wheel shaft is guaranteed, and the stability of the transmission center distance between the worm wheel and the worm is guaranteed, thereby ensuring the stability of the worm wheel in use and preventing deformation or damage to the worm wheel during the transmission connection process. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the internal structure of this utility model.

[0016] Figure 2 This is a schematic diagram of the worm gear connection structure of this utility model.

[0017] Figure 3 This is a schematic diagram of the cross-sectional structure of the worm gear and worm wheel connection of this utility model.

[0018] Figure 4 This is a cross-sectional view of the connection between the worm shaft and the fixed sleeve of this utility model.

[0019] The diagram shows: 1. Motor; 1.1. Output shaft; 1.2. Bearing housing; 2. Output transmission assembly; 2.1. Worm; 2.1.1. First adjustment clearance; 2.1.2. Second adjustment clearance; 2.1.3. Worm shaft; 2.1.4. Chamfer; 2.2. Worm wheel; 2.2.1. Worm wheel input tooth; 2.2.2. Worm wheel output tooth; 2.3. Worm wheel shaft; 3. Locking pin; 3.1. Rack; 4. Adaptive adjustment plate; 5. Fixing sleeve. Detailed Implementation

[0020] The embodiments of this utility model will be further described below with reference to the accompanying drawings.

[0021] like Figure 1-2 As shown, a door lock actuator includes a motor 1, an output transmission assembly 2, and a locking pin 3. The motor 1 controls the locking pin 3 through the output transmission assembly 2 to lock and unlock the door. The output transmission assembly 2 includes a worm gear 2.1, which is circumferentially limited and connected to the output shaft 1.1 of the motor 1. An adaptive adjustment plate 4 is sleeved on the output shaft 1.1, which adaptively adjusts the rotation state according to the transmission connection state of the worm gear. The adaptive adjustment plate 4 is made of wear-resistant lubricating material or has a surface processed with wear-resistant lubrication. The output end of the motor 1 is provided with a bearing chamber 1.2 for placing a bearing. The output shaft 1.1 is rotatably connected to the axis of the bearing chamber 1.2. The adaptive adjustment plate 4 is located between the worm gear 2.1 and the bearing chamber 1.2. The adaptive adjustment plate 4 and the output shaft 1.1 are fitted with a clearance fit, and the minimum clearance of the clearance fit is not less than 0.05 mm.

[0022] like Figure 2 As shown, in the standard drive state of the worm gear 2.1, a first adjustment gap 2.1.1 is provided between the end of the worm gear 2.1 near the motor 1 and the adaptive adjustment plate 4. The first adjustment gap 2.1.1 is not less than 0.05mm. The end of the worm gear 2.1 away from the motor 1 is rotatably connected to a fixed sleeve 5. A second adjustment gap 2.1.2 is provided between the end of the worm gear 2.1 near the fixed sleeve 5 and the fixed sleeve 5. The second adjustment gap 2.1.2 is not less than 0.05mm. Fixing blocks are provided on both sides of the fixed sleeve 5 for fitting into the actuator housing to fix the fixed sleeve 5 inside the actuator.

[0023] like Figure 3 , Figure 4As shown, a worm shaft 2.1.3 is provided on the axis of the worm 2.1. The worm 2.1 and the worm shaft 2.1.3 are designed as an integral unit. The diameter of the worm shaft 2.1.3 is not less than 1 / 2 of the root circle diameter of the worm 2.1. The worm shaft 2.1.3 and the output shaft 1.1 are connected by a D-type plug-in interface structure for circumferential limiting connection. One end of the worm shaft 2.1.3 that is inserted into the fixing sleeve 5 is provided with a chamfer 2.1.4.

[0024] like Figure 1 As shown, the output transmission assembly 2 further includes a worm wheel 2.2 that is rotatably connected to the worm 2.1. The worm wheel 2.2 is rotatably connected to a worm wheel shaft 2.3. The worm wheel 2.2 includes a worm wheel input tooth 2.2.1 that is rotatably connected to the worm 2.1. The output transmission assembly 2 also includes a rack 3.1 that is rotatably connected to the side of the worm wheel 2.2 away from the worm 2.1. The rack 3.1 is located at one end of the locking pin 3. The worm wheel 2.2 meshes with the rack 3.1 through the worm wheel output tooth 2.2.2. The root circle diameter of the worm wheel input tooth 2.2.1 is larger than the root circle diameter of the worm wheel output tooth 2.2.2. The diameter of the worm wheel shaft 2.3 is not less than 3 / 5 of the root circle diameter of the worm wheel output tooth 2.2.2.

[0025] Due to the worm gear reduction transmission, the rotation range of the worm gear output teeth 2.2.2 is relatively small, resulting in a small number of teeth and incomplete circumferential setting. Simultaneously, the effective transmission width between the worm 2.1 and the worm gear 2.2 is small. Therefore, the side of the worm 2.1 near the adaptive adjustment plate 4 is unmachined, primarily serving as the worm shaft 2.1.3 for circumferential limiting connection with the output shaft 1.1. The first adjustment gap 2.1.1 is the gap between the end of the worm shaft 2.1.3 near the adaptive adjustment plate 4 and the adaptive adjustment plate 4. The other end of the worm shaft 2.1.3 needs to be used for rotational connection and positioning with the fixed sleeve 5; therefore, the second adjustment gap 2.1.2 is the gap between the end of the screw near the fixed sleeve 5 and the fixed sleeve 5.

[0026] like Figure 1 As shown, during the driving process of motor 1, when the drive worm wheel 2.2 of worm 2.1 rotates, due to the axial force acting between worm 2.1 and worm wheel 2.2, worm 2.1 will move towards the adaptive adjustment plate 4. When motor 1 is in the off state and the spring of the outer ring of locking pin 3 is reset, worm wheel 2.2 will drive worm 2.1 in the opposite direction. At this time, worm 2.1 will also move towards the adaptive adjustment plate 4. In both cases, the adaptive adjustment plate 4 can meet the adaptive rotation adjustment. With its wear-resistant and lubricating characteristics, it ensures the safety of worm 2.1 in use.

[0027] During the use of the door lock actuator, the design of the adaptive adjustment plate 4, the first adjustment gap 2.1.1, the fixed sleeve 5, and the second adjustment gap 2.1.2 significantly increases the service life of the worm gear 2.1. While ensuring the quality of the worm gear 2.1, it also avoids the probability of the worm gear 2.1 getting stuck during transmission, thus ensuring the quality of the actuator.

[0028] The above description only illustrates the preferred embodiment of this utility model and should not be construed as limiting the scope of the claims. This utility model is not limited to the above embodiments, and variations in its specific structure are permitted. All changes made within the scope of the independent claims of this utility model are also within the scope of protection of this utility model.

Claims

1. A door lock actuator, characterized in that: The device includes a motor (1), an output transmission assembly (2), and a locking pin (3). The motor (1) controls the locking pin (3) through the output transmission assembly (2) to lock and unlock the door. The output transmission assembly (2) includes a worm gear (2.1). The worm gear (2.1) is circumferentially limited and connected to the output shaft (1.1) of the motor (1). An adaptive adjustment plate (4) is sleeved on the output shaft (1.1) to adaptively adjust the rotation state according to the transmission connection state of the worm gear. The output end of the motor (1) is provided with a bearing chamber (1.2) for placing the bearing. The output shaft (1.1) is rotatably connected to the axis of the bearing chamber (1.2). The adaptive adjustment plate (4) is located between the worm gear (2.1) and the bearing chamber (1.2).

2. The door lock actuator according to claim 1, characterized in that: The adaptive adjustment plate (4) and the output shaft (1.1) are fitted with a clearance, and the minimum clearance of the clearance is not less than 0.05 mm.

3. The door lock actuator according to claim 1, characterized in that: In the standard drive state of the worm (2.1), a first adjustment gap (2.1.1) is provided between the end of the worm (2.1) near the motor (1) and the adaptive adjustment plate (4).

4. The door lock actuator according to claim 3, characterized in that: The first adjustment gap ( 2.1.1) Not less than 0.05 mm.

5. A door lock actuator according to claim 1, characterized in that: The end of the worm gear (2.1) away from the motor (1) is rotatably connected to a fixed sleeve (5).

6. A door lock actuator according to claim 5, characterized in that: In the standard drive state of the worm (2.1), a second adjustment gap (2.1.2) is provided between the end of the worm (2.1) near the fixed sleeve (5) and the fixed sleeve (5).

7. A door lock actuator according to claim 6, characterized in that: The second adjustment gap (2.1.2) is not less than 0.05 mm.

8. A door lock actuator according to claim 5, characterized in that: The worm shaft (2.1) is provided on the axis of the worm (2.1). 2.1.3), the worm (2.1) and the worm shaft (2.1.3) are designed as an integral unit, and the diameter of the worm shaft (2.1.3) is not less than 1 / 2 of the root circle diameter of the worm (2.1).

9. A door lock actuator according to claim 8, characterized in that: The worm shaft (2.1.3) and the output shaft (1.1) are connected by a D-type plug-in structure for circumferential limiting connection. The end of the worm shaft (2.1.3) inserted into the fixing sleeve (5) is provided with a chamfer (2.1.4).

10. A door lock actuator according to claim 1, characterized in that: The output transmission assembly (2) further includes a worm wheel (2.2) that is connected to the worm (2.1) for transmission. The worm wheel (2.2) is rotatably connected to a worm wheel shaft (2.3). The worm wheel (2.2) includes a worm wheel input tooth (2.2.1) that is connected to the worm (2.1) for transmission. The output transmission assembly (2) further includes a rack (3.1) that is connected to the side of the worm wheel (2.2) away from the worm (2.1) for transmission. The rack (3.1) is located at one end of the locking pin (3). The worm wheel (2.2) meshes with the rack (3.1) through the worm wheel output tooth (2.2.2). The root circle diameter of the worm wheel input tooth (2.2.1) is larger than the root circle diameter of the worm wheel output tooth (2.2.2). The diameter of the worm wheel shaft (2.3) is not less than 3 / 5 of the root circle diameter of the worm wheel output tooth (2.2.2).

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