Electric unlocking mechanism of automobile tail door lock

Abstract

The utility model discloses an electric unlocking mechanism of an automobile tail door lock. The electric unlocking mechanism comprises a pawl, a clamping plate, a motor, a worm on a motor shaft, a worm gear meshed with the worm, a lead screw coaxially fixed with the worm gear, and a sliding block screwed on the lead screw and changing from rotary motion to linear motion, the sliding block is in shifting connection with one end of a release connecting rod, the other end of the release connecting rod is hinged to a release connecting plate, the upper end of the release connecting plate is hinged to the top end of a release plate hinged to the base through a release plate shaft, and the bottom end of the release plate is in shifting connection with the shifting end of a pawl; the electric unlocking mechanism further comprises a structure and a reset spring, wherein the structure is used for enabling the unlocked motor to rotate reversely so as to reset the sliding block, and the reset spring enables the release plate, the release connecting rod and the release connecting plate to reset. The sliding block of the electric unlocking mechanism indirectly pokes the release plate, so that the installation position in the shell of the lock is loose so as to be suitable for tail door locks of different structures, and the release plate can be linked with the emergency release and suction interruption mechanism.

Description

TECHNICAL FIELD

[0001] The utility model relates to an automobile door lock technical field, specifically is an electric unlocking mechanism of automobile tail door lock. BACKGROUND

[0002] The early electric unlocking mechanism of automobile tail door lock is driven by the motor through the worm and worm gear drive gear set to drive the unlocking assembly to unlock, the gear set adopts a plurality of gears, the structure is relatively complex, and the material cost is relatively high.

[0003] In recent years, some technicians use nut and screw rod pair structure, the motor drives the screw rod to rotate through the worm and worm gear, and drives the nut or slider to move linearly to realize the electric unlocking process, which overcomes the shortcomings of the above prior art.

[0004] However, the electric unlocking mechanism of automobile tail door lock using nut and screw rod pair structure in the above prior art all uses the structure that the slider directly drives the release plate to drive the intermeshing pawl and clamping plate to release the clamping plate, but still has the following disadvantages: 1. The slider can only drive the release plate on one side of the pawl, the installation position of the electric unlocking mechanism is limited, and the application range of various tail door locks with different structures is narrow. 2. The slider directly drives the pawl, cannot be linked with the emergency release and suction interruption mechanism of the automobile tail door lock, so that the structure of the automobile tail door lock is relatively complex, and the part cost is relatively high. UTILITY MODEL CONTENTS

[0005] The utility model wants to solve the technical problem, provides an electric unlocking mechanism of automobile tail door lock that slider indirectly drives release plate and makes the installation position in the shell of lock loose to be applicable to tail door lock with different structures and release plate can be linked with emergency release and suction interruption mechanism.

[0006] The technical solution of the utility model is to provide an electric unlocking mechanism of automobile tail door lock, which comprises a clamping plate hinged to a base through a clamping plate shaft, a clamping plate reset spring arranged on the base and the clamping plate, a pawl hinged to the base through a pawl shaft, a pawl reset spring arranged on the base and the pawl, a motor, a worm on the motor shaft and a worm wheel meshing with the worm, a screw rod coaxially fixed with the worm wheel and a slider rotating into linear motion on the screw rod; the slider is connected with one end of a release connecting rod, the other end of the release connecting rod is hinged to a release connecting plate, the upper end of the release connecting plate is hinged to the top end of a release plate hinged to the base through a release plate shaft, and the bottom end of the release plate is connected with the driving end of the pawl; the electric unlocking mechanism of automobile tail door lock further comprises a starting structure for reversing the motor to reset the slider after unlocking and a reset spring for resetting the release plate, the release connecting rod and the release connecting plate.

[0007] After adopting the above structure, the electric unlocking mechanism of automobile tail door lock has the following advantages:

[0008] The structure is relatively simple and the material cost is relatively reduced because the linear motion slider with nut screw pair is used to replace the plurality of gears of the gear set.

[0009] Especially, the slider indirectly actuates the pawl through the indirectly actuating pawl among the mutually hinged release connecting rod, release connecting plate and release plate to unlock, which greatly reduces the arrangement requirement of the relative position of the slider and the pawl, and the shape, position and connection relationship of the specific parts can be set according to the running direction of the slider, such as right linear running, and the relative position of the slider and the pawl, such as a distance apart. The slider can indirectly actuate the release plate on the other side away from the pawl, so that the installation position of the electric unlocking mechanism in the shell of the tail door lock is loose, thereby widening the application range of the tail door lock with various different structures and being applicable to tail door locks with different structures. Meanwhile, the electric unlocking mechanism can be linked with the emergency release and suction interruption mechanism, that is, the release connecting plate of the electric unlocking mechanism can be used as an interruption plate in the emergency release and interruption mechanism of the tail door lock. On the basis of the release connecting rod and the release connecting plate used as the interruption plate, only an emergency release plate and a actuating structure are needed to realize the emergency interruption function, so that the structure of the tail door lock is relatively simple and compact, the part cost of the tail door lock is relatively saved, and the power transmission efficiency is relatively improved.

[0010] Further, the bottom surface of the slider away from the worm gear has a actuating head, and one end of the release connecting rod has a hook part for approaching the bottom surface of the slider and for actuating connection with the actuating head. After the above structure is used, the actuating connection or disconnection of the slider and the one end of the release connecting rod is more stable and reliable.

[0011] Further, the other end of the release connecting rod is an arc plate with a height dimension greater than a width dimension, the upper part of one surface of the arc plate away from the base rear body has a pin column, the part close to the upper end of the release connecting plate has a pin hole in rotation cooperation with the pin column, and the outer end of the pin column has a limiting structure for preventing the release connecting plate from being disconnected from the release connecting rod. After the above structure is used, the hinge connection of the release connecting plate and the release connecting rod is stable and reliable, and the relative rotation of the two is flexible, and the driving force of the two is good.

[0012] Further, the limiting structure is specifically that the shape of the pin hole of the release connecting plate is a gourd shape, and the free end of the pin column is a gourd-shaped limiting block which can pass through the gourd-shaped pin hole and rotate, and the small diameter section of the gourd-shaped limiting block can prevent the release connecting plate from being disconnected from the release connecting rod. After the above structure is used, the limiting structure can effectively prevent the release connecting plate from being disconnected from the release connecting rod, so that the hinge connection of the two is more stable and reliable, the relative rotation of the two is more flexible, and the driving force of the two is better.

[0013] Further, the starting structure for reversing the motor after unlocking to reset the sliding block is that the base is fixed with a signal switch for detecting the linear moving position of the sliding block, and the signal switch is electrically connected with the BCM of the automobile which can control the forward rotation and reverse rotation of the motor. After the above structure is adopted, when the signal switch detects the linear moving of the sliding block to break the contact after the set time after unlocking, the electric signal is transmitted to the electric control part of the automobile such as the BCM of the automobile, and the BCM of the automobile controls the reverse rotation of the motor to reset the sliding block to the initial position, so that the reverse rotation of the motor after unlocking to reset the sliding block is faster, more stable and more reliable.

[0014] Further, the reset spring for resetting the release plate is a torsion spring, the torsion spring body is sleeved on a torsion spring column of the base, one end of the torsion spring is clamped on the base, and the other end of the torsion spring is clamped on the release plate. After the above structure is adopted, the reset spring for resetting the release plate makes the release plate to drive the pawl to reset the release plate to the initial position after unlocking, so that the resetting of the release plate is faster, more stable and more reliable.

[0015] Further, the reset spring for resetting the release connecting plate and the release connecting rod is a torsion spring, the torsion spring body which is used as the reset spring for resetting the release connecting plate and the release connecting rod is sleeved on a torsion spring column on one side of the other end of the release connecting rod close to the base rear body, one end of the torsion spring is clamped on the other end of the release connecting rod, and the other end of the torsion spring is clamped on the release connecting plate. After the above structure is adopted, the release connecting rod and the release connecting plate use one reset spring, the installation position is relatively saved, the spring cost is relatively saved, and the synchronization, speed, stability and reliability of the resetting of the release connecting rod and the release connecting plate are ensured. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is an appearance schematic view of the automobile tail door lock provided with the electric unlocking mechanism.

[0017] Figure 2 It is a structure schematic view of the preferred embodiment of the electric unlocking mechanism of the utility model mounted on the base and the bottom of the automobile tail door lock and omitting the front seat body and the cover plate and when the sliding block is at the initial position and the clamping plate is at the full locking position.

[0018] Figure 3 It is a structure schematic view of the preferred embodiment of the electric unlocking mechanism of the utility model when the sliding block is at the initial position and the clamping plate is at the full locking position Figure 1 .

[0019] Figure 4 It is a structure schematic view of the preferred embodiment of the electric unlocking mechanism of the utility model when the sliding block is at the initial position and the clamping plate is at the full locking position Figure 2 .

[0020] Figure 5 It is a structure schematic view of the preferred embodiment of the electric unlocking mechanism of the utility model when the sliding block is at the initial position and the clamping plate is at the full locking positionFigure 1 .

[0021] Figure 6 is the structure diagram of the initial position of the sliding block and the unlocking position of the clamping plate of the electric unlocking mechanism preferred embodiment of the utility model Figure 2 .

[0022] Figure 7 is the enlarged structural diagram of the release connecting rod in the electric locking mechanism preferred embodiment of the utility model.

[0023] Figure 8 is the enlarged structural diagram of the release connecting plate in the electric locking mechanism preferred embodiment of the utility model.

[0024] Figure 9 is the enlarged structural diagram of the release plate in the electric locking mechanism preferred embodiment of the utility model.

[0025] The figure shows:

[0026] 1, shell, 11, base, 111, rear seat body, 112, front seat body, 12, base, 121, bottom plate, 122, cover plate;

[0027] 21, clamping plate shaft, 22, clamping plate, 23, clamping plate return spring, 24, pawl shaft, 25, pawl, 26, pawl return spring;

[0028] 31, motor, 32, worm, 33, worm gear, 34, lead screw, 35, sliding block, 351, handle, 36, bearing;

[0029] 4, release connecting rod, 41, hook part, 42, arc plate, 421, pin column, 4211, gourd-shaped limiting block, 42111, small diameter section, 422, hollow torsional spring column, 4221, protruding block, 43, torsional spring clamping horizontal block;

[0030] 5, release connecting plate, 51, torsional spring clamping vertical block, 52, gourd-shaped pin hole, 53, first circular pin hole;

[0031] 61, release plate shaft, 62, release plate, 621, torsional spring clamping block, 63, first torsional spring, 64, second circular pin hole, 65, third circular pin hole;

[0032] 7, hinge pin;

[0033] 8, signal switch;

[0034] 9, second torsional spring. DETAILED DESCRIPTION

[0035] The specific embodiments of the present application will be further described in conjunction with the accompanying drawings. It is to be stated that the description of the specific embodiments is for the purpose of helping to understand the present application, but does not constitute a limitation on the present application. In addition, the technical features involved in each of the specific embodiments of the present application described below can be combined with each other as long as there is no conflict.

[0036] As Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 and Figure 9 indicated.

[0037] The housing 1 of the automobile tail gate lock can include a vertical base 11 and a horizontal base 12, the base 11 can include a rear seat body 111 and a front seat body 112, the base 12 can include a bottom plate 121 and a cover plate 122, and the base 11 and the base 12 are in communication with each other.

[0038] The preferred embodiment of the electric unlocking mechanism of the automobile tail gate lock comprises a clamping plate 22 hinged to the base 12 through a clamping plate shaft 21, a clamping plate reset spring 23 such as a torsion spring arranged on the base 12 and the clamping plate 22, a pawl 25 hinged to the base 12 through a pawl shaft 24, and a pawl reset spring 26 such as a torsion spring arranged on the base 12 and the pawl 25. The bottom end of the clamping plate shaft 21 and the bottom end of the pawl shaft 24 can be fixed, such as integrally formed on the bottom plate 121 of the base 12, the pawl 25 can be a plastic-coated pawl, and the clamping plate 22 can be a plastic-coated clamping plate, which plays a role in noise reduction and prolonging service life. The pawl 25 is also called a stop pawl. The clamping plate 22 is also called a ratchet or a lock tongue. A lock column or lock rod (not shown in the figure) provided on the tail gate body cooperates with the U-shaped groove of the clamping plate 22 to lock the tail gate.

[0039] The preferred embodiment of the electric unlocking mechanism of the automobile tail door lock of the utility model, further comprises a motor 31, a worm 32 on the motor shaft and a worm wheel 33 engaged with the worm 32, a screw rod 34 coaxially fixed with the worm wheel 33 and a sliding block 35 screwed on the screw rod 34 and converted from rotary motion to linear motion. It is not difficult to understand that the sliding block 35 is actually a nut in the nut and screw rod pair, because the nut screwed on the screw rod 34 converts rotary motion to linear motion during the rotation of the screw rod 34, and the nut actually plays the role of the sliding block 35 here, so, for the sake of simplicity and clarity, the nut here is directly referred to as the sliding block 35. The electric unlocking mechanism is also referred to as an electric release mechanism or an electric opening mechanism. It is not difficult to understand that the motor 31 can be fixed, such as engaged or screwed, in the base 11, the screw rod 34 can be coaxially fixed with the center hole of the worm wheel 33 through a key or a pin, one end of the screw rod 34 axially extends out of one side surface of the worm wheel 33, and the two ends of the screw rod 34 can be rotatably matched on the base 11 through respective bearings 36.

[0040] The above is the prior art.

[0041] The invention points of the utility model are as follows.

[0042] In the preferred embodiment of the electric unlocking mechanism of the automobile tail door lock of the utility model, the sliding block 35 is dolly connected with one end of a release connecting rod 4, the other end of the release connecting rod 4 is hingedly connected with a release connecting plate 5, the upper end of the release connecting plate 5 is hingedly connected with the top end of a release plate 63 hingedly connected on the base 11 through a release plate shaft 61, and the bottom end of the release plate 62 is dolly connected with the dolly end of the pawl 25. The dolly connection can also be understood as the dolly connection between the two, that is, the relationship between the two is the relationship of dolly and being dolly. The release connecting rod 4 is also referred to as a release opening rod, or a release opening plate.

[0043] The specific structure of the dolly connection between the sliding block 35 and one end of the release connecting rod 4 can be that the bottom surface of the sliding block 35 away from one end of the worm wheel 33 is provided with a dolly head 351, and one end of the release connecting rod 4 is provided with a hook portion 41 for approaching the bottom surface of the sliding block 35 and for dolly connection with the dolly head 351. The mutually matched surfaces of the hook portion 41 of the release connecting rod 4 and the dolly head 351 of the sliding block 35 can both be arc surfaces. The dolly head 351 can also be referred to as a dolly block.

[0044] The specific structure of the hinge connection between the other end of the release connecting rod 4 and the release connecting plate 5 can be that the other end of the release connecting rod 4 is an arc-shaped plate 42 with a height dimension greater than a width dimension, the upper part of the surface of the arc-shaped plate 42 away from the rear seat body 111 of the base 11 is provided with a pin column 421, the part close to the upper end of the release connecting plate 5 is provided with a pin hole, which is a gourd-shaped pin hole 52 as described below, for rotary cooperation with the pin column 421, and the outer end of the pin column 421 has a limiting structure for preventing the release connecting plate 5 from being separated from the release connecting rod 4. Figure 2 、 Figure 3 and Figure 5The release connecting plate 5 is in a state of left high and right low. It is easy to understand that the release connecting plate 5 can also be used as an interrupt plate in the emergency release and interrupt mechanism of the tailgate lock, that is, the release connecting plate 5 can also be called a release connecting plate used as an interrupt plate, or an interrupt plate used as a release connecting plate.

[0045] The limiting structure for preventing the release connecting plate 5 from being separated from the release connecting rod 4 can be that the pin hole of the release connecting plate 5 is in the shape of a gourd, and the free end of the pin column 421 is in the shape of a gourd limiting block 4211 that can pass through the gourd-shaped pin hole 52 and rotate, and the small-diameter section 42111 of the gourd limiting block 4211 can prevent the release connecting plate 5 from being separated from the release connecting rod 4.

[0046] The specific structure of the upper end of the release connecting plate 5 being hinged to the top end of the release plate 62 can be that the upper end of the release connecting plate 5 has a pin hole such as a circular pin hole, the top end of the release plate 62 has a coaxial pin hole such as a circular pin hole, and a hinge pin 7 or pin shaft is rotationally fitted in the two pin holes. The two ends of the hinge pin 7 can have axial limiting structures, such as one end of the hinge pin 7 being a shaft shoulder or large head, and the other end being an open pin or a screw cap for axial limiting.

[0047] The electric unlocking mechanism of the automobile tailgate lock also includes a starting structure for reversing the motor 31 after unlocking to reset the sliding block 35, and a reset spring for resetting the release plate 62, the release connecting rod 4, and the release connecting plate 5.

[0048] The starting structure for reversing the motor 31 after unlocking to reset the sliding block 35 can be that the base 11 is fixed with a signal switch 8 for detecting the linear movement position of the sliding block 35, and the signal switch 8 is electrically connected with the BCM of the automobile for controlling the forward and reverse rotation of the motor 31. It is easy to understand that the motor 31 is also electrically connected with the electrical control part of the automobile, such as the BCM of the automobile. The two words of linear movement and linear motion can be used interchangeably.

[0049] The specific structure of the release plate reset spring for resetting the release plate 62 can be that the release plate reset spring for resetting the release plate 62 is a torsion spring such as a first torsion spring 63, the body of the first torsion spring 63 is sleeved on a torsion spring column of the base 11, one end of the first torsion spring 63 is clamped on the base 11, and the other end of the first torsion spring 63 is clamped on the release plate 62, such as being clamped on a torsion spring clamping block 621 on the side of the release plate 62 close to the rear seat body 111 of the base 11.

[0050] The reset spring for resetting the release link 4 and the release connecting plate 5 is a torsion spring such as the second torsion spring 9: the torsion spring body of the release link 4 reset torsion spring such as the second torsion spring 9 is sleeved on the torsion spring column on the other end of the release link 4 close to the rear seat body 111 of the base 11, one end of the torsion spring such as the second torsion spring 9 is clamped on the other end of the release link 4, and the other end of the torsion spring such as the second torsion spring 9 is clamped on the release connecting plate 5. The torsion spring column can be a hollow torsion spring column 422, one end of the torsion spring such as the second torsion spring 9 can be clamped on the torsion spring clamping horizontal block 43 on the other end of the release link 4 close to the rear seat body 111 of the base 11, and the other end of the torsion spring such as the second torsion spring 9 can be clamped on the torsion spring clamping vertical block 51 on the release connecting plate 5 close to the rear seat body 111 of the base 11. The outer end of the hollow torsion spring column 422 can have a bulge 4221 protruding radially outward from the circumferential outer diameter, so as to prevent the second torsion spring 9 from being axially separated from the hollow torsion spring column 422. Hinged and rotating cooperation means the same, and rotating cooperation is also called rotating connection.

[0051] As shown in Figures 1-6 , the working process of the electric unlocking mechanism of the automobile tail door lock is as follows:

[0052] 1. In the initial position, the driver turns on the power on the instrument panel, such as pressing the button switch, the motor 31 drives the worm 32 to rotate, the worm 32 engages the worm gear 33 to rotate, the worm gear 33 drives the lead screw 34 to rotate, and the nut, i.e. the sliding block 35, on the lead screw 34 changes from rotary motion to linear motion, i.e. the sliding block 35 moves linearly to the right. The initial position described herein refers to the initial position of the sliding block 35, the release link 4, the release connecting plate 5, the release plate 62, and the pawl 25 respectively as shown in Figure 2 、 Figure 3 and Figure 4 , and at this time the clamping plate 22 is engaged with the pawl 25 and is in the locked position, which is also called the fully locked position, or the initial state, or the locked state, or the fully locked state.

[0053] 2. The sliding block 35 drives the release link 4 and the release connecting plate 5 to move to the right together against the spring force of the reset torsion spring.

[0054] 3. The release connecting plate 5 drives the release plate 62 to rotate clockwise around the release plate shaft 61 against the spring force of the reset spring.

[0055] 4. The lower end of the release plate 62 drives the pawl 25 to rotate counterclockwise, and the pawl 25 is disengaged from the clamping plate 22 against the spring force of the reset torsion spring.

[0056] 5. After the clamping plate 22 is not constrained by the pawl 25, it rotates counterclockwise under the action of the clamping plate reset spring 23, and at this time the tail door lock is in the open position, or the unlocked position, or the fully open position, or the open state, or the unlocked state, or the fully open state.

[0057] 6. After unlocking, within a set time, when signal switch 8 detects that slider 35 has moved linearly and the top of slider 35 has disengaged from the contact of signal switch 8, it immediately transmits an electrical signal to the vehicle's BCM. The vehicle's BCM then controls motor 31 to reverse, causing slider 35 to return to its initial position. At this time, pawl 25 returns to its initial position under the force of pawl return spring 26, release plate 62 returns to its initial position under the force of release plate return spring (i.e., first torsion spring 63), and release linkage and release connecting plate simultaneously return to their initial positions under the force of release linkage return spring (i.e., second torsion spring 9), which also serves as release connecting plate return spring. See also Figure 2 , Figure 3 and Figure 4 It is not difficult to understand that the initial position mentioned here refers to Figure 2 , Figure 3 and Figure 4 The slider 35, release link 4, release connecting plate 5, release plate 62, and pawl 25 are shown in their initial positions. However, at this time, the latch plate 22 and pawl 25 have disengaged and are in the open position, also known as the unlocked position, the fully open position, the open state, the unlocked state, or the fully open state.

[0058] Components, structures, or quantities not marked above are not shown in the drawings, and some components are not marked in the drawings. The drawings are for illustrative purposes only. In case of any inconsistency between the drawings and the text description, or between the drawings themselves, the text description shall prevail.

[0059] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An electric unlocking mechanism of a car tail gate lock, comprising a clamping plate hinged to a base through a clamping plate shaft, a clamping plate return spring arranged on the base and the clamping plate, a pawl hinged to the base through a pawl shaft, a pawl return spring arranged on the base and the pawl, a motor and a worm on a motor shaft, a worm wheel engaged with the worm, a lead screw coaxially fixed with the worm wheel, and a slider screwed on the lead screw and converted from rotary motion to linear motion; characterized in that: The slider is in driving connection with one end of a release connecting rod, the other end of the release connecting rod is in hinged connection with a release connecting plate, the upper end of the release connecting plate is in hinged connection with the top end of a release plate on the base through a release plate shaft, and the bottom end of the release plate is in driving connection with the driving end of the pawl.

2. The electrically operated unlocking mechanism of a tailgate lock of a vehicle according to claim 1, characterized in that: The bottom surface of the slider is provided with a driving head at the end away from the worm gear, and one end of the release connecting rod is provided with a hook portion for approaching the bottom surface of the slider and for driving connection with the driving head.

3. The electrically operated unlocking mechanism of a tailgate lock of a vehicle according to claim 1 or 2, characterized in that: The other end of the release connecting rod is an arc-shaped plate with a height dimension greater than a width dimension, the upper portion of the surface of the arc-shaped plate away from the rear seat body of the base is provided with a pin column, the portion close to the upper end of the release connecting plate is provided with a pin hole in rotational cooperation with the pin column, and the outer end of the pin column is provided with a limiting structure for preventing the release connecting plate from being separated from the release connecting rod.

4. The electrically operated unlocking mechanism of a tailgate lock of a vehicle according to claim 3, characterized in that: The limiting structure is that the pin hole of the release connecting plate is in the shape of a gourd, and the free end of the pin column is in the shape of a gourd limiting block capable of passing through the gourd-shaped pin hole and rotating to prevent the release connecting plate from being separated from the release connecting rod.

5. The electrically operated unlocking mechanism of a tailgate lock of a vehicle according to claim 1, characterized in that: The starting structure for reversing the motor after unlocking to reset the slider is that the base is fixed with a signal switch for detecting the linear movement position of the slider, and the signal switch is electrically connected with the BCM of the automobile capable of controlling the forward rotation and reverse rotation of the motor.

6. The electrically operated unlocking mechanism of a tailgate lock of a vehicle according to claim 1, characterized in that: The release plate resetting spring for resetting the release plate is a torsion spring, the torsion spring body is sleeved on a torsion spring column of the base, one end of the torsion spring is clamped on the base, and the other end of the torsion spring is clamped on the release plate.

7. The electrically operated unlocking mechanism of a tailgate lock of a vehicle according to claim 1, characterized in that: The resetting spring for resetting the release connecting rod and the release connecting plate is a torsion spring, the torsion spring body of the release connecting rod resetting torsion spring serving as the release connecting plate resetting torsion spring is sleeved on a torsion spring column on the surface of the other end of the release connecting rod close to the rear seat body of the base, one end of the torsion spring is clamped on the other end of the release connecting rod, and the other end of the torsion spring is clamped on the release connecting plate.

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