CN107386833B

CN107386833B - Low-noise automobile side door lock

Info

Publication number: CN107386833B
Application number: CN201710760285.2A
Authority: CN
Inventors: 施兆旺
Original assignee: Inteva Automobile Parts Zhenjiang Co ltd
Current assignee: Inteva Automobile Parts Zhenjiang Co ltd
Priority date: 2017-08-30
Filing date: 2017-08-30
Publication date: 2022-08-26
Anticipated expiration: 2037-08-30
Also published as: CN107386833A

Abstract

The invention provides a low-noise automobile side door lock, which comprises a base, a motor, a worm wheel, a spring, a pinion and a sector gear, wherein the motor is arranged on the base; the worm is connected to a rotating shaft of the motor, the worm is meshed with the worm wheel, and the pinion and the worm wheel are coaxially arranged and driven by the worm wheel to rotate; a spring is sleeved in the worm wheel, and two ends of the spring are respectively clamped on the spring fixing block in the base; the pinion is positioned above the worm wheel and is meshed with the sector gear; the center of mass of the worm wheel is located at the rotation center of the worm wheel, and the center of mass of the sector gear is a point on the angular bisector of the sector gear, which is close to the rotation center. Above-mentioned car side door lock of low noise is owing to through worm wheel, sector gear and spring three's mass balance to and the sector gear that has the damping vibration damping design, can reduce worm wheel, sector gear in the motion process because the vibration that the unbalance of part leads to reduces inertial force and moment of inertia, reduces the noise in the part motion process, reduces simultaneously because the inertial force of part causes the risk of automatic unblock.

Description

Low-noise automobile side door lock

Technical Field

The invention relates to the field of automobile side door locks, in particular to a low-noise automobile side door lock.

Background

With the development of automobile industry in China, the application requirements of users on automobile side door locks are gradually improved, and particularly, higher requirements are put forward on suppliers in the aspects of noise, vibration and harshness (NVH), such as vibration noise of electric locking and unlocking of the side door locks. The existing side door lock mechanism has the problems of high transmission noise defect, higher additional dynamic pressure, shorter durable service life of parts, higher risk of multistage transmission failure, lower transmission efficiency and the like in the use process.

Disclosure of Invention

Accordingly, there is a need for a low-noise side door lock for an automobile, which is capable of solving the problems of high noise and short durability life of parts.

A low-noise side door lock of an automobile comprises a base, a motor, a worm gear, a spring, a pinion and a sector gear, wherein the motor, the worm gear, the spring, the pinion and the sector gear are all arranged in the base;

the worm is connected to a rotating shaft of the motor, the worm is meshed with the worm wheel, the worm wheel and the pinion are sleeved on a worm wheel shaft of the base, and the pinion and the worm wheel are coaxially arranged and driven by the worm wheel to rotate; a spring is sleeved in the worm wheel, and two ends of the spring are respectively clamped on the spring fixing block in the base; the pinion is positioned above the worm gear, the pinion is meshed with the sector gear, and one end, far away from the pinion, of the sector gear is sleeved on the rotating shaft of the base;

the center of mass of the worm wheel is located at the rotation center of the worm wheel, and the center of mass of the sector gear is a point on the angular bisector of the sector gear, which is close to the rotation center of the sector gear.

According to the technical scheme, the center of mass of the worm wheel is located at the rotation center of the worm wheel, the center of mass of the sector gear is a point, close to the rotation center of the sector gear, on the angular bisector of the sector gear, and the spring is arranged; in addition, due to the arrangement of the spring, the accurate movement and automatic reset functions of the worm wheel can be realized.

In one embodiment, the distance between the center of mass of the sector gear and the rotation center of the sector gear is 2-10 mm.

In one embodiment, the fan-shaped gear further comprises a spring piece and a PCB, wherein the spring piece is positioned on the sector gear and drives the spring piece to be in contact with a contact on the PCB when the sector gear rotates;

when the sector gear rotates towards the direction close to the PCB and the elastic sheet is contacted with the locking contact on the PCB, the PCB transmits a locking signal to the vehicle body controller;

when the sector gear rotates towards the direction far away from the PCB, the spring plate is in contact with the unlocking contact on the PCB, and the PCB transmits an unlocking signal to the automobile body controller.

According to the technical scheme, the elastic piece is arranged and used for replacing the microswitch, and the elastic piece is low in cost, safe and reliable, so that the production cost is saved.

In one embodiment, a hole is formed in one side, close to the elastic sheet, of the sector gear.

In one embodiment, the outer sides of two side edges of the sector gear are respectively provided with a long strip-shaped elastic body convex piece, and the two elastic body convex pieces are arranged by taking the angular bisector of the sector gear as an axis symmetry.

According to the technical scheme, the elastic body convex parts are arranged on the two sides of the sector gear, and the sector gear is provided with the damping vibration attenuation design, so that vibration energy transmitted by the sector gear can be attenuated, vibration near the resonance frequency can be weakened, and vibration noise can be further reduced.

In one embodiment, the spring is a non-linear spring.

According to the technical scheme, the spring is a nonlinear spring, the spring is extruded under the rotation action of the worm gear, when the extrusion amount is maximum, the extrusion force of the spring is also maximum, vibration and noise caused by violent impact of a sector gear relative to the spring on the base can be avoided, and the risk of clamping stagnation between the sector gear and the pinion is avoided; meanwhile, the worm wheel is reset under the action of a spring, and the worm wheel can slow down and stop due to the nonlinear characteristic.

In one embodiment, a clamping groove and a plurality of wind tunnels are arranged on the end face of the worm wheel, the clamping groove comprises an annular clamping groove and a sector clamping groove, the annular clamping groove and the sector clamping groove are of an integrally formed structure, a circular gear ring of the pinion is placed in the annular clamping groove, and the sector clamping groove is matched with a sector boss of the pinion; the wind tunnels are positioned on the end face of the worm wheel, which is far away from one side of the fan-shaped clamping groove.

Above-mentioned technical scheme owing to be equipped with the draw-in groove, can place the fan-shaped boss of pinion in the draw-in groove of worm wheel, rotates when the worm wheel, and the fan-shaped boss of pinion contacts with a lateral wall of fan-shaped draw-in groove to the worm wheel rotates and drives the pinion and rotate, plays spacing effect to the movement track of pinion.

In one embodiment, the locking mechanism further comprises a locking link, wherein the locking link is positioned outside the base and rotates synchronously with the sector gear.

Has the advantages that: the low-noise automobile side door lock has the following advantages:

1. because the mass center of the worm wheel is positioned at the rotation center of the worm wheel, the mass center of the sector gear is a point on the angular bisector of the sector gear, which is close to the rotation center of the sector gear, and the spring is arranged, the dynamic balance design is adopted, and the mass balance among the worm wheel, the sector gear and the spring can reduce the vibration of the worm wheel and the sector gear caused by the unbalance of parts in the motion process, reduce the inertia force and the inertia moment, reduce the noise of the parts in the motion process, reduce the risk of automatic unlocking caused by the inertia force of the parts at the same time, and prolong the service life of the parts; in addition, due to the arrangement of the spring, the accurate movement and automatic reset functions of the worm wheel can be realized.

2. Because the elastic body convex parts are arranged on the two sides of the sector gear, and the sector gear is provided with a damping vibration attenuation design, the vibration energy transmitted by the sector gear can be attenuated, the vibration of the resonant frequency accessory is weakened, and the vibration noise can be further reduced.

Drawings

FIG. 1 is a front view of a low noise side door latch of the present invention with the locking link removed;

FIG. 2 is a schematic view showing the construction of a low noise side door lock for an automobile according to the present invention;

FIG. 3 is an exploded view of the worm gear, pinion, spring within the base of the present invention;

FIG. 4 is a schematic view of the worm gear and spring of the present invention in an assembled configuration;

FIG. 5 is a schematic view of the worm and sector gear mounting arrangement of the present invention;

FIG. 6 is a schematic view of the worm gear, pinion and sector gear of the present invention in their initial states;

FIG. 7 is a diagram illustrating a locking signal status according to the present invention;

FIG. 8 is a schematic diagram of the unlock signal status according to the present invention;

FIG. 9 is a front view of the worm wheel of embodiment 1;

FIG. 10 is a front view of a worm wheel of comparative example 1;

FIG. 11 is a graph of frequency versus motion transmissivity for a sector gear;

fig. 12 is a frequency-sound graph of an automotive side door lock.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1

Referring to fig. 1 to 6, a low-noise side door lock for an automobile includes a base 1, a motor 2, a worm 3, a worm wheel 4, a spring 5, a pinion 6, a sector gear 7, a spring plate 8, a PCB 9 and a locking link 10, wherein the motor 2, the worm 3, the worm wheel 4, the spring 5, the pinion 6, the sector gear 7, the spring plate 8 and the PCB 9 are all installed in the base 1;

the worm 3 is connected to a rotating shaft of the motor 2, the worm 3 is meshed with the worm wheel 4, the worm wheel 4 and the pinion 6 are sleeved on a worm wheel shaft 11 of the base 1, and the pinion 6 and the worm wheel 4 are coaxially arranged and driven by the worm wheel 4 to rotate; the worm wheel 4 is internally sleeved with a spring 5, two ends of the spring 5 are respectively clamped on a spring fixing block 12 in the base 1, and preferably, the spring 5 is a nonlinear spring. The pinion 6 is positioned above the worm wheel 4, the pinion 6 is meshed with the sector gear 7, and one end of the sector gear 7, which is far away from the pinion 6, is sleeved on the rotating shaft of the base 1.

Wherein the center of mass of the worm wheel 4 is located at the center of rotation of the worm wheel 4. Preferably, a clamping groove 41 and a plurality of wind tunnels 42 are arranged on the end face of the worm wheel 4, the clamping groove 41 comprises a circular clamping groove 411 and a sector clamping groove 412, the circular clamping groove 411 and the sector clamping groove 412 are of an integrally formed structure, a circular gear ring of the pinion 6 is placed in the circular clamping groove 411, and the sector clamping groove 412 is matched with a sector boss of the pinion 6; a plurality of air tunnels 42 are located on the end face of the worm wheel 4 on the side remote from the sector-shaped slot 412. Due to the arrangement of the clamping grooves 41 and the plurality of air tunnels 42, the mass center of the worm wheel 4 can be located on the rotation center line of the worm wheel 4, and the whole worm wheel 4 keeps balance in the movement process. Other wind tunnels 42, such as a strip tunnel, may be used, and are designed such that the center of mass of the entire worm gear 4 is located at the center of rotation of the worm gear 4.

The mass center of sector gear 7 is a point on the angular bisector of sector gear 7 close to the rotation center of sector gear 7. Preferably, the distance between the center of mass of the sector gear 7 and the rotation center of the sector gear is 2-10 mm. The spring plate 8 is located on the sector gear 7, a hole 71 is arranged on one side of the sector gear 7 close to the spring plate 8, strip-shaped elastic body convex pieces 72 are respectively arranged on the outer sides of two side edges of the sector gear 7, and the two elastic body convex pieces 72 are arranged in an axisymmetric manner by taking the angular bisector of the sector gear 7 as an axis. When the sector gear 7 rotates, the elastic sheet 8 is driven to be in contact with a contact on the PCB 9; when the sector gear 7 rotates towards the direction close to the PCB 9 and the elastic sheet 8 is contacted with the locking contact on the PCB 9, the PCB 9 transmits a locking signal to the automobile body controller; when the sector gear 7 rotates towards the direction far away from the PCB 9, the elastic sheet 8 is contacted with the unlocking contact on the PCB 9, and the PCB 9 transmits an unlocking signal to the automobile body controller. The sector gear 7 can be provided with a plurality of holes 71 according to requirements, the shapes of the holes 71 can be selected according to requirements, and the center of mass of the whole sector gear mechanism formed by the sector gear 7 and the elastic sheet 8 is positioned at a point on the angular bisector of the sector gear 7, which is close to the rotation center of the sector gear. The center of mass of the sector gear mechanism can be located on the angular bisector of sector gear 7 on the side close to elongated elastic body convex part 72, or can be located on the angular bisector of sector gear 7 on the side far from elongated elastic body convex part 72. In this embodiment, the center of mass of the sector gear mechanism is located on the angular bisector of the sector gear 7 near one side of the elongated elastic body protruding part 72, and the distance between the center of mass of the sector gear mechanism and the rotation center of the sector gear is 5 mm.

Wherein, the locking link 10 is located outside the base 1, and the locking link 10 rotates synchronously with the sector gear 7. The lock link 10 performs a locking or unlocking operation in accordance with the rotation of the sector gear 7.

Referring to fig. 6 and 7, the locking process of the low-noise side door lock of the vehicle includes: when the door of car side door lock received the signal and need lock the door, motor 2 forward circular telegram work, drive worm 3 anticlockwise rotation under motor 2's effect, worm 3 drives worm wheel 4 clockwise, worm wheel 4 rotates to a certain position and drives pinion 6 rotatory, pinion 6 drives sector gear 7 anticlockwise rotation, thereby make the contact of locking contact on shell fragment 8 and the PCB board, and simultaneously, locking connecting rod 10 locks the operation, PCB board 9 transmits the signal of locking and gives automobile body controller, back worm wheel 4 gets back to initial condition under the drive of spring 5, can accomplish the step of locking.

Referring to fig. 6 and 8, the unlocking process of the low-noise side door lock of the vehicle includes: when the automobile side door lock receives a signal and needs to unlock the automobile door, the motor 2 is electrified to work reversely, the worm 3 is driven to rotate clockwise under the action of the motor 2, the worm 3 drives the worm wheel 4 to rotate anticlockwise, the worm wheel 4 rotates to a certain position to drive the pinion 6 to rotate, the pinion 6 drives the sector gear 7 to rotate clockwise, so that the elastic sheet 8 is in contact with an unlocking contact on the PCB 9, meanwhile, the locking connecting rod 10 is used for unlocking, the PCB 9 transmits an unlocking signal to the automobile body controller, the rear worm wheel 4 returns to an initial state under the driving of the spring 5, and the unlocking step can be completed.

Example 2

The present embodiment is different from embodiment 1 in that: the outer sides of two side edges of the sector gear 7 are not provided with the elongated elastic body convex pieces 72, the mass center of the sector gear mechanism consisting of the sector gear 7 and the elastic pieces 8 is positioned on the angular bisector of the sector gear 7 far away from one side of the elongated elastic body convex pieces 72, and the distance between the mass center of the sector gear mechanism and the rotation center of the sector gear 7 is 2 mm.

Example 3

The present embodiment is different from embodiment 1 in that: the centroid of the sector gear mechanism formed by the sector gear 7 and the elastic sheet 8 is positioned on the angular bisector of the sector gear 7 close to one side of the elongated elastic body convex piece 72, and the distance between the centroid of the sector gear mechanism and the rotation center of the sector gear 7 is 10 mm.

Comparative example 1

Referring to fig. 10, the comparative example differs from example 1 in that: the mass center of the worm wheel 4 is located at the position indicated by the reference number 100 in fig. 10, the elastic body convex parts 72 are not arranged on the two sides of the sector gear 7, the mass center of the sector gear mechanism formed by the sector gear 7 and the elastic sheet 8 is not on the angular bisector of the sector gear 7, the mass center of the sector gear mechanism is located on a straight line which is close to one side of the hole 71 and deviates from the angular bisector of the sector gear 7 by 10 degrees, and the distance between the mass center of the sector gear mechanism and the rotation center of the sector gear 7 is 15 mm.

Performance testing

1. Relationship between mass center of worm wheel and inertia force and moment of inertia

The inertia force and the inertia moment are calculated for the worm wheel 4 in the embodiment 1 and the comparative example 1, so that the influence of the difference of the mass center position of the worm wheel on the inertia force and the inertia moment is obtained. The calculation was performed according to the calculation formula of table 1. In comparative example 1, the distance from the centroid of the worm wheel 4 to the y-axis is L1, and the distance from the y-axis is L2; example 1 the center of mass of the worm gear 4 is located at the center of rotation of the gear, indicated by reference numeral 200 in figure 9, and the center of mass is spaced from the x-axis by a distance L3 and from the y-axis by a distance L4.

TABLE 1 schematic representation of the calculation formula

And calculating according to the calculation formula of the table 1 to obtain data statistics of the inertia force and the inertia moment at different centroid positions as shown in the table 2.

TABLE 2 comparison of inertial force and moment of inertia data at different centroid positions

As can be seen from tables 1 and 2, by comparing the designs of different mass center positions, the inertia force and the inertia moment generated by the worm wheel 4 in the rotation direction will be different. The mass center of the worm wheel 4 in the embodiment 1 is located at the rotation center of the worm wheel 4, so that the inertia force and the inertia moment of the worm wheel 4 are both 0, which indicates that the worm wheel 4 achieves dynamic balance, no harmful impact force is generated on the whole automobile side door lock, and the worm wheel 4 is prevented from vibrating to generate noise in the movement process.

2. Comparison of resonant frequency and transmissibility test curves of different sector gears

The sector gears 7 in examples 1-3 and the sector gear 7 in comparative example 1 were tested to obtain a resonance frequency-transmittance curve test in the course of motion, and the test results are shown in fig. 11.

As can be seen from fig. 11, when the elastic body protrusions 72 are provided on both sides of the sector gear 7, the sector gear has a damping design, so that vibration energy transmitted by the sector gear is attenuated, and vibration near the resonance frequency can be attenuated, thereby further reducing vibration noise. If the undamped vibration damping design is adopted, the peak values of the transmission rates respectively appear on the main frequencies f1 and f2, and after the undamped vibration damping design is adopted, the peak values of the transmission rates do not appear on f1 and f2, so that the vibration noise can be further reduced, and the vibration noise of the embodiments 1 to 3 is smaller.

3. Noise test for automobile side door lock

The noise test was performed on the simulated operation of the automobile side door locks of example 1 and comparative example 1, and the test results are shown in fig. 12.

As can be seen from fig. 12, the noise of the automobile side door lock in the embodiment 1 is much lower than that in the comparative example 1, so that the noise of the automobile side door lock in the embodiment 1 is smaller, the quality is better, and the requirements of customers can be met.

According to the automobile side door lock, the aim of reducing the transmission noise of the automobile side door lock is fulfilled by the mass balance design and the damping vibration attenuation design of the sector gear; the mass balance of the worm wheel, the sector gear and the spring, namely the mass distribution of the adjusting component and the special measures adopted on the structure limit each inertia force and inertia moment within the expected allowable range; and damping vibration reduction design is carried out on two sides of the sector gear, so that kinetic energy is converted into elastic potential energy, and vibration energy is absorbed.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. The low-noise automobile side door lock is characterized by comprising a base (1), a motor (2), a worm (3), a worm wheel (4), a spring (5), a pinion (6) and a sector gear (7), wherein the motor (2), the worm (3), the worm wheel (4), the spring (5), the pinion (6) and the sector gear (7) are all arranged in the base (1);

the worm (3) is connected to a rotating shaft of the motor (2), the worm (3) is meshed with the worm wheel (4), the worm wheel (4) and the pinion (6) are sleeved on a worm wheel shaft (11) of the base (1), and the pinion (6) is coaxial with the worm wheel (4) and is driven by the worm wheel (4) to rotate; a spring (5) is sleeved in the worm wheel (4), and two ends of the spring (5) are respectively clamped on a spring fixing block (12) in the base (1); the small gear (6) is positioned above the worm wheel (4), the small gear (6) is meshed with the sector gear (7), and one end, far away from the small gear (6), of the sector gear (7) is sleeved on the rotating shaft of the base (1);

the centroid of worm wheel (4) is located the center of rotation of worm wheel (4), the centroid of sector gear (7) is one point on sector gear (7) angular bisector, the centroid of sector gear (7) with the distance of sector gear center of rotation is 2 ~ 10 mm.

2. The low-noise automobile side door lock according to claim 1, characterized by further comprising a spring plate (8) and a PCB (9), wherein the spring plate (8) is positioned on the sector gear (7), and when the sector gear (7) rotates, the spring plate (8) is driven to contact with a contact on the PCB (9);

when the sector gear (7) rotates towards the direction close to the PCB (9) and the elastic sheet (8) is contacted with the locking contact on the PCB (9), the PCB (9) transmits a locking signal to the vehicle body controller;

when the sector gear (7) rotates towards the direction far away from the PCB (9), and the elastic sheet (8) is in contact with the unlocking contact on the PCB (9), the PCB (9) transmits an unlocking signal to the vehicle body controller.

3. A low noise side door lock for vehicle according to claim 2, wherein said sector gear (7) has a hole (71) on the side near said striking plate (8).

4. A low-noise side door lock for automobiles according to any one of claims 1 to 3, wherein the outer sides of both sides of said sector gear (7) are respectively provided with a long strip-shaped elastic body convex member (72), and said two elastic body convex members (72) are arranged with the angular bisector of said sector gear (7) as the axis symmetry.

5. A low noise side door lock for vehicles according to claim 1, wherein said spring (5) is a non-linear spring.

6. The low-noise automobile side door lock according to claim 1, wherein a clamping groove (41) and a plurality of wind tunnels (42) are formed in the end face of the worm wheel (4), the clamping groove (41) comprises an annular clamping groove (411) and a sector clamping groove (412), the annular clamping groove (411) and the sector clamping groove (412) are of an integrally formed structure, a circular gear ring of the pinion (6) is placed in the annular clamping groove (411), and the sector clamping groove (412) is matched with a sector boss of the pinion (6); the wind tunnels (42) are positioned on the end face of the worm wheel (4) on the side far away from the fan-shaped clamping groove (412).

7. A low noise side door lock for vehicle according to any one of claims 1, 5 or 6, further comprising a locking link (10), wherein said locking link (10) is located outside said base (1), and said locking link (10) rotates synchronously with said sector gear (7).