WO2022247297A1

WO2022247297A1 - Parking executing mechanism

Info

Publication number: WO2022247297A1
Application number: PCT/CN2022/070448
Authority: WO
Inventors: 孙韬; 王宗浩; 董存; 王昆
Original assignee: 上海纳铁福传动系统有限公司
Priority date: 2021-05-25
Filing date: 2022-01-06
Publication date: 2022-12-01
Also published as: CN113183933A; CN113183933B

Abstract

A parking executing mechanism. A pushing device comprises a pushing rod (5), a rotating rod (6), and a connecting portion (8); the pushing rod (5) comprises a pushing rod body (51), one end of the pushing rod body (51) is connected to a driving device, and the other end of the pushing rod body is provided with a circle of saw teeth (52); a plurality of pushing rod guide keys (53) are evenly provided on the outer wall of the end portion, away from the driving device, of the pushing rod body (51) in the circumferential direction; the rotating rod (6) comprises a rotating rod body (61), a plurality of rotating rod guide keys (62) are evenly provided on the outer wall of one end of the rotating rod body (61) in the circumferential direction, and a rotating rod inclined surface (621) is provided at one end of each rotating rod guide key (62); a cavity (81) is formed in the connecting portion (8); first sliding grooves (83) and second sliding grooves (84) are formed in the side wall of the cavity (81) in a staggered mode in the circumferential direction; and the outer diameters of the pushing rod guide keys (53) are smaller than the inner diameters of the first sliding grooves (83), which are smaller than the outer diameters of the rotating rod guide keys (62), which are smaller than the inner diameters of the second sliding grooves (84). According to the mechanism, an electromagnetic valve, the pushing rod, the rotating rod, and the connecting portion which are low in cost are used for replacing an execution motor and a lead screw, so that costs of the mechanism can be greatly reduced, and the controllability and durability of the mechanism are improved.

Description

A parking actuator

technical field

The invention relates to the technical field of parking, in particular to a parking actuator.

Background technique

When the car is in the parking gear, the parking mechanism locks the transmission shaft or the rear wheel, which ensures the safety of the car. Existing parking mechanism mainly is made up of executive motor, screw mechanism, awl block, ratchet and ratchet. The executive motor converts the circular motion and torque of the executive motor into the linear motion and linear force of the cone block by using the principle of the screw. Rigid connection. When the pawl is stuck in the tooth groove of the ratchet, the ratchet cannot rotate, and the shaft and the wheel are locked to achieve the purpose of parking.

The main cost of the existing parking mechanism is concentrated on the executive motor and the leading screw. Considering noise control, EMC and service life, more expensive brushless motors are currently used, and the cost of the lead screw is much higher than other mechanical components. How to reduce the production cost under the premise of ensuring the stability of the parking and non-parking states is an urgent problem to be solved by those skilled in the art.

Contents of the invention

In view of the above-mentioned defects, the object of the present invention is to provide a parking actuator, which improves the controllability and safety of the mechanism while reducing the production cost.

The present invention provides a parking actuator, comprising a ratchet, a pawl, a pushing device and a driving device, the pushing device includes a cone block, the driving device is connected with the pushing device, and drives the cone block to perform linear reciprocating motion , the cone block drives the teeth of the ratchet into or out of the tooth groove of the ratchet, the pushing device also includes a push rod, a rotating rod and a connecting part, the push rod includes a push rod body, the push rod One end of the rod body is connected with the driving device, and the other end is provided with a circle of sawtooth, each of which includes two oppositely arranged sawtooth slopes; the outer wall of the end of the push rod body far away from the driving device is uniformly provided with multiple a push rod guide key; the rotating rod comprises a rotating rod body, and the outer wall of one end of the rotating rod body is evenly provided with a plurality of rotating rod guiding keys along the circumferential direction, and one end of the rotating rod guiding key is provided with a rotating rod The inclined surface of the rotating rod matches the sawtooth inclined surface; the other end of the rotating rod body is connected with the cone block through a reset device; a cavity is provided in the connecting part, and the push rod and the rotating The rods are respectively slidably connected with the cavities; the side walls of the cavities are alternately provided with first sliding grooves and second sliding grooves along the circumference, and the outer diameter of the push rod guide key is smaller than the first sliding groove. The inner diameter of the groove<the outer diameter of the guide key of the rotating rod<the inner diameter of the second chute; a fixed block is arranged between the adjacent first chute and the second chute, and the fixed block is close to the rotating One end of the rod is provided with a fixed block inclined surface, and the inclined direction of the fixed block inclined surface is the same as that of the rotating rod inclined surface.

Preferably, the driving device is a solenoid valve.

Preferably, the electromagnetic valve includes a housing, an electromagnetic coil and a valve core arranged in the housing, and a spring is provided between the valve core and the housing; inside the casing.

Preferably, the reset device is a spring.

Preferably, one end of the first chute close to the rotating rod is provided with a chute slope, and the slope of the chute is in the same direction as the slope of the rotating rod.

Preferably, the slopes of the sawtooth slope, the slope of the rotating rod and the slope of the fixed block are the same.

Preferably, the end of the push rod body away from the driving device is provided with a cavity, and the end of the rotating rod body away from the cone block is provided with an insertion part, and the insertion part is matched with the cavity .

The invention is beneficial in that the actuator motor and lead screw are replaced by low-cost solenoid valves, push rods, rotating rods and connecting parts, which can greatly reduce the cost of the mechanism and improve the controllability and durability of the mechanism. In addition, because the structure of the solenoid valve is simple, its input and output performance can be adjusted only by adjusting the coil. Compared with motors, it has greater adjustment freedom and can be applied to various special situations.

Description of drawings

Fig. 1 is the schematic diagram of parking executive mechanism of the present invention;

Fig. 2 is the connection schematic diagram of driving device and pushing device;

Fig. 3 is the structural representation of push rod;

Fig. 4 is the structural representation of rotating bar;

Fig. 5 is an axial sectional view of the connecting portion;

Fig. 6 is a schematic diagram of the internal structure of the connecting part;

Fig. 7 is a schematic diagram of the guide key of the rotating rod in the connecting part in the first stable state;

Fig. 8 is a schematic diagram of the guide key of the rotating rod in the connecting part in the second stable state;

Fig. 9 is an exploded schematic view of the rotation rod guide key changing from the first stable state to the second stable state in the connecting part;

Fig. 10 is an exploded schematic view of the rotation rod guide key changing from the second stable state to the first stable state in the connecting portion.

Component label description:

1 pawl

2 ratchets

3 reset device

4 cones

5 putters

51 push rod body

52 Serrated

521 Serrated bevel

53 Push rod guide key

54 cavity

6 Turning lever

61 Rotating rod body

62 Turning rod guide key

621 Turning rod slope

63 Insertion part

7 Solenoid valve

71 Shell

72 electromagnetic coil

73 Spool

74 spring

8 connection part

81 cavities

82 fixed block

821 fixed block slope

83 The first chute

831 chute slope

84 Second chute

Detailed ways

The specific implementation manners of the present invention will be described in further detail below in conjunction with the accompanying drawings. These embodiments are only used to illustrate the present invention, not to limit the present invention.

In the description of the present invention, it should be noted that the orientations or positional relationships indicated by the terms "center", "top", "bottom", "inner" and "outer" are based on the orientations or positional relationships shown in the accompanying drawings , is only for the convenience of describing the present invention and simplifying the description, but does not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and should not be understood as indicating or implying relative importance.

In addition, in the description of the present invention, unless otherwise specified, "plurality" means two or more.

As shown in Fig. 1 and Fig. 2, the parking actuator of the present invention includes a ratchet 2, a pawl 1, a pushing device and a driving device. The ratchet 2 is connected in the casing (not shown) through the output shaft (not shown), one end of the ratchet 1 is rotatably connected with the casing, and the other end can be engaged with or separated from the ratchet 2 . At the same time, the pawl 1 is also provided with an elastic reset device (such as a torsion spring, etc.). In the initial state, the elastic reset device is in a relaxed state, and the ratchet 1 is separated from the ratchet 2; when the external force drives the ratchet 1 to engage with the ratchet 2, the elastic reset device provides elastic force, and the elastic force can drive the ratchet 1 to separate from the ratchet 2 trend. The pushing device includes a cone block 4, and the driving device is connected with the pushing device to drive the cone block 4 to perform linear reciprocating motion. The cone block 4 is located under the ratchet 1, and it is provided with a thick part and a thin part distributed along its axial direction. When the thick part contacts the ratchet 1, the ratchet 1 is pushed into the tooth groove of the ratchet 2 to realize the parking. Car state: when the detail is in contact with the pawl 1, the pawl 1 will break away from the tooth groove of the ratchet 2 under the reset action of the elastic reset device, and realize the non-parking state.

The pushing device of the present invention also includes a push rod 5, a rotating rod 6 and a connecting part 8, and the cone block 4 is pushed to move linearly by the aforementioned three devices. As shown in FIG. 3 , the push rod 5 includes a push rod body 51 , one end of the push rod body 51 is connected to the driving device, and the other end is provided with a circle of saw teeth 52 , and each saw tooth 52 includes two opposite saw tooth slopes 521 . There is no gap between two adjacent saw teeth 52 . A plurality of push rod guide keys 53 are uniformly arranged on the outer wall of the end portion of the push rod body 51 away from the driving device along the circumferential direction.

As shown in Figure 4, the rotating rod 6 comprises a rotating rod body 61, a plurality of rotating rod guide keys 62 are evenly arranged on the outer wall of one end of the rotating rod body 61 along the circumferential direction, and one end of the rotating rod guiding keys 62 away from the cone block 4 is provided with The inclined surface 621 of the rotating rod is matched with the inclined surface 521 of the sawtooth. The other end of the rotating rod body 61 is connected with the cone block 4 through the reset device 3 . The reset device 3 is preferably a spring.

As shown in Fig. 2 and Fig. 5-8, the position of the connecting part 8 is fixed, and it is a rotating body, which is provided with a through cavity 81, and the push rod 5 and the rotating rod 6 are respectively slidably connected with the cavity 81, and both The ends abut or separate in the cavity 81. The side wall of the cavity 81 is provided with a first chute 83 and a second chute 84 alternately along the circumferential direction, and the push rod guide key 53 and the rotation rod guide key 62 can be connected with the first chute 83 or the second chute 84 Swipe to connect. In order to ensure the stability of the parking and non-parking states, the outer diameter of the push rod guide key 53<the inner diameter of the first chute 83<the outer diameter of the rotating rod guide key 62<the inner diameter of the second chute 84, that is, the push rod The guide key 53 can pass through the first chute 83 and the second chute 84 , while the rotation rod guide key 62 can only pass through the second chute 84 and cannot pass through the first chute 83 . Between the adjacent first chute 83 and the second chute 84, a fixed block 82 is provided, and one end of the fixed block 82 near the rotating rod 6 is provided with a fixed block slope 821, and the direction of inclination of the fixed block slope 821 is the same as that of the rotating rod slope 621. The direction of inclination is the same, so that the rotation direction of the rotation rod 6 in the connecting portion 8 can be limited. Preferably, one end of the first chute 83 close to the turning rod 6 is provided with a chute slope 831, the direction of inclination of the chute slope 831 is the same as that of the rotation rod slope 621, so that the rotation rod guide key 62 can be firmly locked in the sliding direction. between the groove slope 831 and the fixing block 82 .

Since the parking state and the non-parking state always appear alternately, the propulsion device of the present invention provides two stable states that can appear alternately, that is, the first stable state and the second stable state. The first stable state is shown in Figure 7, the rotating rod guide key 62 is located in the second chute 84, and the rotating rod 6 cannot move or rotate around the axial direction without other external force and the limiting effect of the second chute 84 . The second stable state is shown in FIG. 8 , the rotating rod guide key 62 is stuck between the chute slope 831 and the fixed block 82 , and the rotating rod 6 cannot move or rotate around the axial direction. Since the parking and non-parking states are mainly determined by the thickness position of the cone block 4, the corresponding parking states of the aforementioned two stable states can be exchanged as required, and both the first stable state and the second stable state can be set to parking. or non-parking steady state.

In a specific embodiment of the present invention, the number of the first chute 83, the second chute 84, and the guide key 62 of the rotating rod are the same, and the number of the sawtooth 52 and the guide key 53 of the push rod is equal to the number of the guide key 62 of the rotating rod. twice, so as to ensure that the connecting portion 8 can play a maximum position-limiting and guiding effect on the push rod 5 and the rotation 6 . The push rod guide key 53 is aligned with the center line of the sawtooth 52, and the slopes of the sawtooth inclined plane 521, the rotating rod inclined plane 621 and the fixed block inclined plane 821 are the same. As shown in Figure 2-4, the end of the push rod body 51 away from the driving device is provided with a cavity 54, and the end of the rotating rod body 61 away from the cone block 4 is provided with an insertion part 63, and the insertion part 63 is matched with the cavity 54 . In the initial state, when the sawtooth slope 521 is not in contact with the rotation rod slope 621, the insertion part 63 is still located in the cavity 54, and the cavity 54 can guide the movement of the push rod 5 to ensure that the sawtooth slope 521 is in contact with the rotation rod slope. 621 was successfully contacted and promoted.

The working principle of the propelling device of the present invention is as follows:

As shown in FIG. 9 , when it is necessary to switch from the first stable state to the second stable state, the driving device drives the push rod 5 to move in the direction of the rotating rod 6 , and the sawtooth slope 521 contacts the rotating rod slope 621 . When the rotating rod guide key 62 is in the second chute 84, the tangential component force exerted by the sawtooth slope 521 on the rotating rod slope 621 is offset by the supporting force provided by the chute wall, and only the axial force acts on the rotating rod guide key. 62, the reset device 3 is compressed. The rotating rod guide key 62 gradually breaks away from the second chute 84 under the action of the axial force. At this time, the tangential component force exerted by the sawtooth slope 521 on the rotating rod slope 621 makes the rotating rod 6 rotate, and on the fixed block slope 821 Move to where the first chute 83 is located under the guiding action. When the rotating rod slope 621 was completely separated from the sawtooth slope 521, the rotating rod 6 entered between the chute slope 831 and the fixed block 82 under the elastic force of the resetting device 3 to realize the second stable state.

As shown in FIG. 10 , when it is necessary to switch from the second stable state to the first stable state, the driving device drives the push rod 5 to move in the direction of the rotating rod 6 , and the sawtooth slope 521 contacts the rotating rod slope 621 . When the rotating rod guide key 62 is still in contact with the fixed block 82, the tangential component force exerted by the sawtooth slope 521 on the rotating rod slope 621 is offset by the supporting force provided by the fixed block 82, and only the axial force acts on the rotating rod guide key. 62, the reset device 3 is compressed. The guide key 62 of the rotating rod is gradually separated from the fixed block 82 under the action of the axial force. At this time, the tangential component force exerted by the sawtooth inclined surface 521 on the inclined surface of the rotating rod 621 makes the rotating rod 6 rotate, and the guiding effect of the inclined surface 821 of the fixed block Move down to where the second chute 84 is located. When the rotating rod slope 621 is completely separated from the sawtooth slope 521, the rotating rod 6 slides into the second chute 84 under the action of the elastic force of the reset device 3 to realize the first stable state.

In order to realize the switching between the above states, the drive device can be a linear drive device such as a hydraulic cylinder or an air cylinder, or a low-cost electromagnetic valve 7 can be used as in the present invention. As shown in FIG. 2 , the electromagnetic valve 7 includes a housing 71 , an electromagnetic coil 72 and a valve core 73 disposed in the housing 71 , and a spring 74 is provided between the valve core 73 and the housing 71 . One end of the connecting portion 8 is fixedly connected to the housing 71 .

In the non-energized state, one end of the push rod 5 is located in the housing 71 , and the other end is located in the connecting portion 8 . At this time, the spring 74 is in a relaxed state, and most of the valve core 73 is located outside the electromagnetic coil 72 . In the energized state, due to the magnetic field attraction of the electromagnetic coil 72, the spool 73 enters the interior of the electromagnetic coil 72, and as the volume of the spool 73 enters increases, the electromagnetic force increases. At this time, the spring 74 stretches, and the spool 73 pushes pole 5. During the process of pushing the rotary rod 6 by the push rod 5, the reset device 3 is compressed. When the rotating rod 6 rotates under the action of the tangential component force and breaks away from the push rod 5, the elastic potential energy of the reset device 3 is released, and the rotating rod 6 reaches the first or second stable state under the thrust of the reset device 3, and the push rod 5 Return to the housing 71 again. The solenoid valve 7 is powered off, and the spring 74 drives the spool 73 to return to the original position, waiting for the next state switching.

In summary, the present invention is beneficial in that it uses solenoid valves, push rods, rotating rods and connecting parts to replace existing motors and lead screws, while greatly reducing the cost and complexity of the mechanism, and improving the reliability of the mechanism . This structure realizes smooth switching between parking and non-parking stable states, reduces the difficulty of controlling the mechanism, and improves the instability of the mechanism. At the same time, it has low requirements on the machining accuracy of each component and low requirements on suppliers and processing equipment. , greatly improving the applicability and popularity.

The above is only a preferred embodiment of the present invention, it should be pointed out that for those of ordinary skill in the art, without departing from the technical principle of the present invention, some improvements and replacements can also be made, these improvements and replacements It should also be regarded as the protection scope of the present invention.

Claims

A parking actuator, comprising a ratchet (2), a pawl (1), a pushing device and a driving device, the pushing device includes a cone block (4), the driving device is connected with the pushing device, and drives the cone The block (4) makes a linear reciprocating motion, and the cone block (4) drives the teeth of the ratchet (1) to snap into or get out of the tooth grooves of the ratchet (2). It is characterized in that the pushing device also includes Push rod (5), turning rod (6) and connecting part (8),

The push rod (5) includes a push rod body (51), one end of the push rod body (51) is connected to the driving device, and the other end is provided with a circle of saw teeth (52), and each saw tooth (52) includes two opposite A sawtooth slope (521) is provided; the outer wall of the end of the push rod body (51) away from the driving device is evenly provided with a plurality of push rod guide keys (53) along the circumference;

The rotating rod (6) comprises a rotating rod body (61), the outer wall of one end of the rotating rod body (61) is evenly provided with a plurality of rotating rod guide keys (62) along the circumference, and the rotating rod guide keys One end of (62) is provided with the inclined surface of rotating rod (621), and described rotating rod inclined surface (621) matches with described sawtooth inclined surface (521); The other end of described rotating rod body (61) passes reset device (3) Connected with the cone block (4);

A cavity (81) is provided in the connecting portion (8), and the push rod (5) and the rotating rod (6) are respectively slidably connected with the cavity (81);

The side wall of the cavity (81) is alternately provided with a first sliding groove (83) and a second sliding groove (84) along the circumference, and the outer diameter of the push rod guide key (53) is smaller than the first sliding groove (84). The inner diameter of a chute (83)<the outer diameter of the rotating rod guide key (62)<the inner diameter of the second chute (84); the adjacent first chute (83) and the second chute ( 84) is provided with a fixed block (82), and one end of the fixed block (82) near the rotating rod (6) is provided with a fixed block slope (821), and the inclination direction of the fixed block slope (821) is the same as The inclined directions of the rotating rod inclined surfaces (621) are the same.
The parking actuator according to claim 1, characterized in that the driving device is a solenoid valve (7).
The parking actuator according to claim 2, characterized in that, the solenoid valve (7) comprises a housing (71), an electromagnetic coil (72) and a valve core ( 73), a spring (74) is arranged between the spool (73) and the housing (71); in a non-energized state, one end of the push rod (5) is located in the housing (71).
The parking actuator according to claim 1, characterized in that the reset device (3) is a spring.
The parking actuator according to claim 1, characterized in that, one end of the first chute (83) close to the rotating rod (6) is provided with a chute slope (831), and the chute slope ( 831) has the same inclination direction as the inclination direction of the rotating rod slope (621).
The parking actuator according to claim 1, characterized in that, the slopes of the sawtooth slope (521), the rotation rod slope (621) and the fixed block slope (821) have the same slope.
The parking actuator according to claim 1, characterized in that, the end of the push rod body (51) away from the driving device is provided with a cavity (54), and the rotating rod body (61) is far away from the The end of the cone block (4) is provided with an insertion part (63), and the insertion part (63) is matched with the cavity (54).