CN114061946A

CN114061946A - Gear shifting angle deviation detection device and detection method of parking positioning plate

Info

Publication number: CN114061946A
Application number: CN202111565471.3A
Authority: CN
Inventors: 徐俊; 赵宇辉; 石海泉; 高惬
Original assignee: Hubei Aviation Precision Machinery Technology Co Ltd
Current assignee: Hubei Aviation Precision Machinery Technology Co Ltd
Priority date: 2021-12-20
Filing date: 2021-12-20
Publication date: 2022-02-18

Abstract

The invention discloses a gear shift angle deviation detection device of a parking positioning plate and a detection method thereof, wherein the detection device comprises a positioning mechanism and a pressing mechanism for positioning the parking positioning plate to be detected; the pressing mechanism comprises a pressing ball head and an arc surface which is coaxial with the hole axis of the connecting hole of the parking positioning plate; when the pressing ball head is positioned at the initial position, the pressing ball head presses against the designated position of one side wall of the V-shaped groove of the parking positioning plate; the pressing mechanism can rotate by taking the hole axis of the connecting hole as a rotating shaft under the counter-acting force of the side wall, and can automatically reach stress balance and stop rotating when the pressing ball head reaches the end position which simultaneously presses and supports the side walls on the two sides of the V-shaped groove. And measuring the arc length rotated by any point on the arc surface in the process that the pressing ball head reaches the end point position from the initial position, calculating the actual value of the rotating angle of the pressing mechanism according to the arc length and the radius of the arc surface, and obtaining the difference value between the actual value and the designed value to obtain the shift angle deviation.

Description

Gear shifting angle deviation detection device and detection method of parking positioning plate

Technical Field

The invention relates to the technical field of automobile parking systems, in particular to a gear shift angle deviation detection device of a parking positioning plate and a detection method thereof.

Background

The P-gear parking function of the transmission realizes parking locking and unlocking through the engagement and disengagement of a pawl arranged on a transmission shell and a ratchet wheel arranged on a transmission shaft.

As shown in fig. 1 and 2, when the automobile is in a P-gear state, a gear shifting action is transmitted to the parking positioning plate 01, so that the parking positioning plate 01 rotates by taking the hole axis of the connecting hole 011 as a rotating shaft, and the pawl is driven to be meshed with the ratchet wheel by the rotation of the parking positioning plate 01, thereby realizing parking locking. In a locked state, the ball of the parking pin 02 is embedded into one V-shaped groove 012 of the parking positioning plate 01 and is in close contact with two side walls of the V-shaped groove 012, and at this time, an included angle between the axis of the pin hole 013 of the parking positioning plate 01 and the axis of the parking pin 02 is a first shift angle θ 1 of the parking positioning plate 01.

When the automobile needs to move, a non-P gear is hung, a gear shifting action is transmitted to the parking positioning plate 01, the parking positioning plate 01 rotates around the axis of the hole of the connecting hole 011, and the pawl is driven to be separated from the ratchet wheel through the rotation of the parking positioning plate 01, so that unlocking is realized. In an unlocked state, the ball of the parking pin 02 is embedded into the other V-shaped groove 012 of the parking positioning plate 01 and is in close contact with two side walls of the V-shaped groove 012, and at this time, an included angle between an axis of a hole of the pin hole of the parking positioning plate 01 and an axis of the parking pin 02 is a second shift angle θ 2 of the parking positioning plate 01.

The parking function of the automobile is related to the driving safety of the automobile, which requires a parking system to have high precision, and the first gear shifting angle theta 1 and the second gear shifting angle theta 2 are important parts of a size chain in the parking system, which affects the gear shifting precision of the whole parking system, so that strict requirements are imposed on the first gear shifting angle theta 1 and the second gear shifting angle theta 2. In actual production, the actual values of the first shift angle θ 1 and the second shift angle θ 2 deviate from the design values due to the manufacturing tolerance and the assembly tolerance of the parts, and the deviation of the actual values of the first shift angle θ 1 and the second shift angle θ 2 from the design values is usually required to be within ± 0.3 °.

How to detect the deviation of the actual values of the first shift angle θ 1 and the second shift angle θ 2 from the design values is a technical problem that needs to be solved by those skilled in the art.

Disclosure of Invention

The invention provides a gear shift angle deviation detection device of a parking positioning plate and a detection method thereof, which can detect the deviation of the actual value and the designed value of the gear shift angle of the parking positioning plate.

The gear shifting angle deviation detection device of the parking positioning plate comprises a positioning mechanism for positioning the parking positioning plate to be detected and a pressing mechanism for pressing the parking positioning plate; the pressing mechanism comprises a pressing ball head which is modeled with a ball head of the parking pin and an arc surface which is coaxial with the hole axis of the connecting hole; when the pressing ball head is positioned at the initial position, the pressing ball head presses against the designated position of one side wall of the V-shaped groove of the parking positioning plate; the pressing mechanism can rotate by taking the hole axis of the connecting hole as a rotating shaft under the reaction force of the side wall on one side of the V-shaped groove, and can automatically reach stress balance and stop rotating when the pressing ball head reaches the end point position which simultaneously presses and supports the side walls on the two sides of the V-shaped groove.

The gear shift angle deviation detection device can measure the deviation between the actual value and the designed value of the gear shift angle of the parking positioning plate, namely the deviation of the gear shift angle of the parking positioning plate.

In one embodiment, the detection device further comprises an arc length measuring mechanism for measuring the arc length rotated by any point on the arc surface; the arc length measuring mechanism includes: the first winding part, the first tensioning part used for tensioning the first winding part and the displacement sensor are arranged, one end of the first winding part is connected with the pressure applying mechanism, one part of the first winding part is tightly wound on the arc surface and is coaxial with the arc surface, the other end of the first winding part is a free end, the free end of the first winding part can move linearly along with the rotation of the pressure applying mechanism, and the displacement sensor is used for measuring the linear moving distance of the free end of the first winding part. By the design, the detection speed and the accuracy of the shift angle deviation of the parking positioning plate can be further improved.

In one embodiment, the detecting device further comprises a counterweight mechanism for applying a rotation torque to the pressing mechanism to counteract the rotation torque applied to the pressing mechanism from the arc length measuring mechanism. By the design, the detection speed and the accuracy of the shift angle deviation of the parking positioning plate can be further improved.

In one embodiment, the weight mechanism includes: the second winding and be used for the tensioning the second tensioning piece of second winding, the one end of second winding with apply pressure the mechanism and connect, partly tight winding of second winding on the arc surface and with the arc surface is coaxial, the other end of second winding is the free end, the free end of second winding can follow apply pressure the rotation of mechanism and follow rectilinear movement. By the design, the rotating torque applied to the pressure applying mechanism by the counterweight mechanism can automatically change along with the change of the rotating torque applied to the pressure applying mechanism by the arc length measuring mechanism, and the two rotating torques can be ensured to be offset mutually all the time.

In one embodiment, the first tensioning member and the second tensioning member respectively tension the first winding member and the second winding member by their own weight. By the design, a power component for applying tension is not required to be additionally arranged.

In one embodiment, the pressing mechanism rotates in a horizontal plane, the arc length measuring mechanism comprises a first reversing member, the counterweight mechanism comprises a second reversing member, and a free end of the first winding member and a free end of the second winding member respectively bypass the first reversing member and the second reversing member to be reversed to a vertical direction.

In an embodiment, the mechanism of exerting pressure is equipped with the shaft hole, positioning mechanism includes location axle and locating pin, the location axle with shaft hole clearance fit and with the connecting hole clearance fit of the parking locating plate that awaits measuring, the location axle is along radially being equipped with the locating hole, the locating pin with locating hole clearance fit and with the pinhole clearance fit of the parking locating plate that awaits measuring. By the design, the positioning shaft plays a role in positioning the parking positioning plate and also plays a role in switching the pressing mechanism, so that the parking positioning plate is multipurpose, the structure is simplified, and the coincidence of the rotation axis of the pressing mechanism and the hole axis of the connecting hole of the parking positioning plate is guaranteed.

In one embodiment, the detection device further comprises a drive mechanism, the drive mechanism comprising: the pressing mechanism comprises a rotary driving piece for driving the pressing mechanism to rotate and a movable driving piece for driving a pressing ball head of the pressing mechanism to move so as to enable the pressing ball head to be in contact with or separated from the side wall of the V-shaped groove.

In one embodiment, the detection device further comprises a control mechanism, the control mechanism comprises an electronic control module in communication connection with the driving mechanism and a calculation module in communication connection with the displacement sensor, and the calculation module is used for calculating an actual value of an angle rotated by the pressing mechanism according to data measured by the displacement sensor and a prestored radius of the arc surface and calculating a shift angle deviation according to the actual value and a prestored design value.

The detection method of the shift angle deviation detection device comprises the following steps:

positioning the parking positioning plate to be measured by using the positioning mechanism to fix the position of the parking positioning plate;

adjusting the pressure applying ball head to the initial position, and enabling the pressure applying ball head to continuously apply pressure to one side wall of a V-shaped groove of the parking positioning plate until the pressure applying mechanism rotates under the reaction force of one side wall of the V-shaped groove to drive the pressure applying ball head to reach the final position;

measuring the arc length of any point on the arc surface of the pressing mechanism rotating in the process that the pressing ball head reaches the end point position from the initial position, calculating the actual value of the rotating angle of the pressing mechanism according to the arc length and the radius of the arc surface, and taking the difference between the calculated actual value and the design value determined in the product design process to obtain the shift angle deviation.

Drawings

FIG. 1 is a schematic view of a parking plate and a parking pin in a parked state and an unparked state;

FIG. 2 is a perspective view of the parking positioning plate;

FIG. 3 is a schematic view of the parking detection apparatus according to the present invention in a detection state;

fig. 4 is a partial structural diagram of fig. 3.

The reference numerals are explained below:

01 parking positioning plate, 011 connecting hole, 012V-shaped groove, 013 pin hole and 02 parking pin;

10 positioning mechanisms, 101 positioning shafts, 101a positioning holes and 102 positioning pins;

20, a pressing mechanism, 201 pressing pins, 201a pressing ball head, 202 pin bases, 203 turnplates, 203a arc surfaces and 203b shaft holes;

a 30 arc length measuring mechanism, a 301 first winding member, a 302 first tensioning member, a 303 displacement sensor and a 304 first reversing member;

40 counterweight mechanism, 401 second winding member, 402 second tensioning member, 403 second reversing member;

a 50 drive mechanism, 501 a first rotary drive, 502 a second rotary drive, 503 a mobile drive;

60 control mechanisms, 601 electric control modules and 602 analysis modules;

70, a base.

Detailed Description

In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution of the present invention is further described in detail below with reference to the accompanying drawings and the detailed description.

As shown in fig. 1 and 2, in the P-gear engaged state of the vehicle, the parking positioning plate 01 rotates to the position shown by the solid line in the figure by using the hole axis of the connecting hole 011 as a rotating shaft, the ball of the parking pin 02 is embedded into one V-shaped groove 012 of the parking positioning plate 01 and is in close contact with the side walls of the V-shaped groove 012 at two sides, and at this time, the included angle between the hole axis of the pin hole 013 of the parking positioning plate 01 and the axis of the parking pin 02 is the first shift angle θ 1 of the parking positioning plate 01. When the automobile is in a non-P-gear state, the parking positioning plate 01 rotates around the hole axis of the connecting hole 011 to the position shown by the dotted line in the figure, the ball head of the parking pin 02 is embedded into the other V-shaped groove 012 of the parking positioning plate 01 and is in close contact with the side walls of the two sides of the V-shaped groove 012, and at the moment, the included angle between the hole axis of the pin hole 013 of the parking positioning plate 01 and the axis of the parking pin 02 is the second gear shifting angle theta 2 of the parking positioning plate 01. Due to the influence of assembly and manufacturing tolerances, etc., there is always a deviation between the actual value and the design value of the first shift angle θ 1 and the second shift angle θ 2. The gear shift angle deviation detecting device provided by the scheme is used for detecting the deviation.

As shown in fig. 4, the shift angle deviation detecting device includes a positioning mechanism 10, a pressing mechanism 20, an arc length measuring mechanism 30, a weight mechanism 40, a driving mechanism 50, a control mechanism 60, and a base 70.

The detection process of the gear shift angle deviation detection device is as follows:

the positioning mechanism 10 positions the parking positioning plate 01 to be measured on the base 70, and fixes the position of the parking positioning plate 01.

The electronic control module 601 of the control mechanism 60 controls the driving mechanism 50 to act, and drives the pressing ball 201a of the pressing mechanism 20 to reach an initial position, wherein the pressing ball 201a is profiled with the ball of the parking pin 02, that is, the profile and the size are the same as those of the ball of the parking pin 02; when the pressing ball 201a is located at the initial position, it just presses against a specified position of one side wall of one V-shaped groove 012 of the parking lot 01.

Under the driving action of the driving mechanism 50, the pressing ball 201a continuously presses the side wall of the V-shaped groove 012, so that the pressing ball 201a continuously receives a reaction force from the side wall, and the reaction force breaks the original force balance of the pressing mechanism 20, so that the pressing mechanism 20 rotates around the hole axis of the connection hole 011 of the parking positioning plate 01.

During the rotation of the pressing mechanism 20, the pressing ball 201a slides along the sidewall of the V-shaped groove 012 pressed by the pressing ball until reaching the end position.

When the pressing ball 201a is located at the end position, the pressing ball 201a simultaneously presses against both side walls of the V-shaped groove 012, so that reaction forces from both side walls are received, and the reaction forces of both side walls cancel each other, so that the pressing mechanism 20 is again in force balance, and thus the pressing mechanism 20 stops rotating.

The arc length measuring mechanism 30 is connected with the pressure applying mechanism 20, and can measure: the arc length that any point on the arc surface 203a of the pressing mechanism 20 rotates during the process of the pressing ball 201a from the initial position to the end position.

The calculation module 602 of the control mechanism 60 calculates, from the arc length measured by the arc length measuring mechanism 30 and the radius of the arc surface 203a of the pressing mechanism 20: the calculated value of the angle rotated by the pressing mechanism 20 in the process of the pressing ball head 201a from the initial position to the end position is the actual value of the angle rotated by the pressing mechanism 20; this actual value is equivalent to: in the working process of the parking system, the parking positioning plate 01 rotates from the position where the specified position of the parking pin 02 is abutted against the side wall of one side of the V-shaped groove 012, and the parking pin 02 is abutted against the side wall of the two sides of the V-shaped groove 012, during which the parking positioning plate 01 rotates.

The calculation module 602 of the control mechanism 60 takes the difference between the actual value and the design value of the angle through which the pressing mechanism 20 rotates, and the obtained difference is the shift angle deviation. The design value is determined in the product design process, and specifically means that: the parking positioning plate 01 rotates from the position where the parking pin 02 is in contact with the designated position on the side wall of the V-shaped groove 012, to the position where the parking pin 02 is in contact with the side walls of the V-shaped groove 012 on both sides, during which the parking positioning plate 01 rotates by the designed angle. Thus, one detection is completed.

Since the arc length measuring mechanism 30 is connected to the pressure applying mechanism 20, the pressure applying mechanism 20 may receive a rotation torque from the arc length measuring mechanism 30 to rotate the pressure applying mechanism, and the rotation torque may cause an actual value of an angle rotated by the pressure applying mechanism 20 to not truly reflect an actual value of an angle rotated by the parking positioning plate 01 when the parking system is operated, thereby affecting the detection accuracy. For the purpose of improving the detection accuracy, a counterweight mechanism 40 is provided, and the counterweight mechanism 40 is connected to the pressing mechanism 20 and applies a rotation torque to the pressing mechanism 20 to cancel out the rotation torque applied to the pressing mechanism 20 from the arc length measuring mechanism 30.

In short, the detection principle of the shift angle deviation detecting device is: the parking positioning plate 01 which should rotate in work is fixed, a ball head copying piece (namely, a pressing ball head 201a) of the parking pin 02 rotates under the reaction force of the parking positioning plate 01, the pressing ball head 201a automatically reaches stress balance after rotating to a final position so as to stop rotating, an actual value of an angle rotated by the pressing ball head 201a is calculated by using an arc length rotated by any point on an arc surface 203a which is coaxial and synchronously rotated with the pressing ball head 201a and the radius of the arc surface 203a, and the difference value of the actual value and a designed value is taken to obtain the gear shifting angle deviation of the parking positioning plate 01.

The gear shifting angle deviation detection device can quickly and accurately detect the gear shifting angle deviation of the parking positioning plate 01, so that the parking positioning plate 01 with the gear shifting angle deviation not meeting the requirement can be screened out, and the requirement for the parking performance after the transmission is assembled can be met.

In the illustrated embodiment, the positioning mechanism 10 includes a positioning shaft 101 and a positioning pin 102. The positioning shaft 101 is fixed to the base 70. The positioning shaft 101 is provided with a positioning hole 101a, and a hole axis of the positioning hole 101a extends in a radial direction of the positioning shaft 101. The positioning shaft 101 is inserted into the connecting hole 011 of the parking positioning plate 01, and the positioning pin 102 is inserted into the positioning hole 101a of the positioning shaft 101 and the pin hole 013 of the parking positioning plate 01, so that the position of the parking positioning plate 01 is fixed. Clearance relief structures (such as clearance plugs) may be used to relieve mating clearance between the bore and the pin and between the bore and the shaft.

In the illustrated embodiment, the pressing mechanism 20 includes a rotating plate 203, the rotating plate 203 is provided with a shaft hole 203b, and the positioning shaft 101 is further inserted into the shaft hole 203b and is closely matched with the shaft hole 203b in a clearance fit manner, so that the rotating plate 203 can rotate around the positioning shaft 101, and the rotation axis coincides with the hole axis of the connecting hole 011 of the parking positioning plate 01. Due to the design, the positioning shaft 101 plays a role in positioning the parking positioning plate 01 and also plays a role in switching the turntable 203, is multipurpose, is more beneficial to simplifying the structure, and is beneficial to ensuring that the rotation axis of the turntable 203 coincides with the hole axis of the connecting hole 011 of the parking positioning plate 01.

The arc surface 203a is formed on the turntable 203, and in the illustrated embodiment, the turntable 203 has a fan-shaped structure, and the arc surface 203a is formed on the outer peripheral surface of the fan-shaped structure. The turntable 203 is designed to be a fan-shaped structure, which is convenient for forming the arc surface 203a, and the driving mechanism 50 can push against the straight edge of the fan-shaped turntable 203 to rotate the turntable to the target position, so that the driving mechanism 50 can apply force to the turntable conveniently. Of course, in actual practice, the turntable 203 is not limited to a fan-shaped structure. The radius of the arc surface 203a is set larger, which is more favorable for improving the detection precision.

In the illustrated embodiment, the driving mechanism 50 includes a first rotary driving element 501 and a second rotary driving element 502, the first rotary driving element 501 and the second rotary driving element 502 are respectively located at two straight sides of the sector turntable 203, one is used for pushing the sector turntable 203 to rotate along the pointer, and the other is used for pushing the sector turntable 203 to rotate counterclockwise.

In the illustrated embodiment, the pressing mechanism 20 further includes a pressing pin 201 and a pin holder 202. Pin boss 202 is fixed to turntable 203 and rotates synchronously with turntable 203. The press pin 201 is fitted in the seat hole of the pin seat 202 with a small clearance fit. One end of the pressing pin 201 is directed to the parking positioning plate 01, and the pressing ball 201a is disposed at the end of the pressing pin 201. The pressing pin 201 can move axially in the seat hole and move towards the direction close to the parking lot 01, so that the pressing ball 201a presses against the side wall of the V-shaped groove 012 of the parking lot 01 and moves towards the direction far away from the parking lot 01, and the pressing ball 201a can be separated from the side wall of the V-shaped groove 012 of the parking lot 01.

In the illustrated embodiment, the driving mechanism 50 further comprises a movable driving member 503, the movable driving member 503 being integrally mounted on the pin seat 202 for urging the pressing pin 201 to move axially in the seat hole. During detection, the first rotary driving element 501 and/or the second rotary driving element 502 may drive the turntable 203 to rotate so as to drive the pressing pin 201 to reach a proper position, and then the movable driving element 503 may drive the pressing pin 201 to axially move so as to drive the pressing ball 201a to press against a specified position of the sidewall of the V-shaped groove 012 of the parking positioning plate 01.

The movable driving part 503, the first rotary driving part 501 and the second rotary driving part 502 can all adopt motors, the motors are small in size, convenient to control and high in precision, and the appointed positions of the side walls of the V-shaped grooves 012 of the parking positioning plate 01, which are accurately pressed by the pressing ball heads 201a, are favorably ensured. Of course, other drive means, such as hydraulic or pneumatic drive means, may be used. The electronic control module 601 of the control mechanism 60 is in communication connection with the movable driving member 503, the first rotary driving member 501 and the second rotary driving member 502 at the same time, and can control the actions of the three members at the same time.

In the illustrated embodiment, the arc length measuring mechanism 30 includes: a first winding member 301, a first tensioning member 302, and a displacement sensor 303. The first tensioning member 302 tensions the first winding member 301. The first winding element 301 is a rope. One end of the first winding member 301 is connected to the pressing mechanism 20. A portion of the first winding member 301 is tightly wound around the circular arc surface 203a of the pressing mechanism 20 and is coaxial with the circular arc surface 203 a. The other end of the first winding member 301 is a free end. When the pressing mechanism 20 rotates, the free end of the first winding member 301 can move along with it in a straight line, and the displacement sensor 303 automatically measures the straight line movement distance of the free end of the first winding member 301. The linear movement distance is the arc length of any point on the arc surface 203a of the rotating mechanism. The displacement sensor 303 may be a contact sensor or a noncontact sensor.

This arc length measuring mechanism 30 changes the arc length that any point rotated on the arc surface 203a into the linear motion of first winding 301 free end, through the linear motion distance of the free end of measuring first winding 301, learns the arc length that any point rotated on the arc surface 203a, the arc length that any point rotated on the arc surface 203a of measuring that like this can be quick accurate. Of course, the arc length of any point on the arc surface 203a can be obtained by providing the pointer and the scale on the arc surface 203a and the base 70, respectively, but the arc length data measured by the arc length measuring mechanism 30 is more accurate than that.

In addition, by adopting the arc length measuring mechanism 30, the calculating module 602 of the control mechanism 60 can be in communication connection with the displacement sensor 303, the displacement sensor 303 transmits the measured arc length data to the calculating module 602, the calculating module 602 automatically calculates the actual value of the angle rotated by the pressing mechanism 20 according to the arc length data and the pre-stored radius of the arc surface 203a, and the actual value is subtracted from the pre-stored design value of the angle, so that the shift angle deviation is automatically calculated. In addition, the control mechanism 60 may further include a code scanner for reading the code information on the parking positioning plate 01 to store the code information and the calculated shift angle deviation after the code information and the calculated shift angle deviation correspond to each other, which facilitates data statistical analysis and quality management improvement.

In the illustrated embodiment, the weight mechanism 40 includes: a second wrapping element 401 and a second tensioning element 402. The second tensioning member 402 tensions the second winding member 401. The second winding member 401 employs a winding rope. One end of the second winding member 401 is connected to the pressing mechanism 20. A part of the second winding member 401 is tightly wound around the circular arc surface 203a of the pressing mechanism 20 and is coaxial with the circular arc surface 203 a. The other end of the second winding member 401 is a free end. When the pressing mechanism 20 rotates, the free end of the second winding member 401 can move along with it in a straight line.

The rotating torque applied to the pressing mechanism 20 by the weight mechanism 40 and the rotating torque applied to the pressing mechanism 20 by the arc length measuring mechanism 30 are the same in magnitude and opposite in direction, so that the two rotating torques can be cancelled out. The rotation torque applied to the pressing mechanism 20 by the arc length measuring mechanism 30 is changed according to the linear movement of the free end of the first winding member 301, and similarly, the rotation torque applied to the pressing mechanism 20 by the weight mechanism 40 is changed according to the linear movement of the free end of the second winding member.

Since the first winding member 301 and the second winding member 401 are tightly wound on the arc surface 203a of the pressing mechanism 20 and are coaxial with the arc surface 203a, the linear movement distance of the free end of the second winding member 401 is the same as the linear movement distance of the free end of the first winding member 301, and thus, the variation amounts of the two rotational moments are the same, so that it can be ensured that the rotational moment applied to the pressing mechanism 20 by the counterweight mechanism 40 and the rotational moment applied to the pressing mechanism 20 by the arc length measuring mechanism 30 are always dynamically equal.

In the illustrated embodiment, the first tensioning member 302 and the second tensioning member 402 tension the first winding member 301 and the second winding member 401, respectively, using their own weight. By the design, no power component for providing tension is required to be additionally arranged.

In the illustrated embodiment, the hole axis of the connection hole 011 extends in the vertical direction, so that the pressing mechanism 20 rotates in the horizontal plane, and this design can prevent the detection accuracy from being affected by the self-weight of the pressing mechanism 20. When the first winding member 301 and the second winding member 401 are designed to wind in the horizontal direction, in this case, to realize that the first tensioning member 302 and the second tensioning member 402 respectively tension the first winding member 301 and the second winding member 401 by their own weight, it is necessary to change the free end of the first winding member 301 and the free end of the second winding member 401 to the vertical direction respectively.

In the illustrated embodiment, the arc length measuring mechanism 30 is provided with a first direction changing member 304, the counterweight mechanism 40 is provided with a second direction changing member 403, the free end of the first winding member 301 is changed to the vertical direction by bypassing the first direction changing member 304, and the free end of the second winding member 401 is changed to the vertical direction by bypassing the second direction changing member 403. The first and second reversing

members

304, 403 may employ a rolling structure such as a pulley to reduce friction. The first direction-changing member 304 and the second direction-changing member 403 are respectively mounted on two fixing seats, and the fixing seats are fixed on the base 70.

The shift angle deviation detecting device and the detecting method thereof according to the present invention have been described in detail. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.

Claims

1. A gear shift angle deviation detection device of a parking positioning plate is characterized in that the parking positioning plate (01) is provided with a connecting hole (011) and a V-shaped groove (012) which is abutted against a ball head of a parking pin (02), and the parking positioning plate (01) rotates by taking the hole axis of the connecting hole (011) as a rotating shaft when a parking system works, and the gear shift angle deviation detection device comprises a positioning mechanism (10) for positioning the parking positioning plate (01) to be detected and a pressure mechanism (20) for applying pressure to the parking positioning plate (01); the pressing mechanism (20) comprises a pressing ball head (201a) which is profiled with the ball head of the parking pin (02) and an arc surface (203a) which is coaxial with the hole axis of the connecting hole (011); the pressing ball head (201a) is pressed against a designated position of one side wall of the V-shaped groove (012) when being positioned at an initial position; the pressing mechanism (20) can rotate by taking the hole axis of the connecting hole (011) as a rotating shaft under the counterforce of the side wall on one side of the V-shaped groove (012), and can automatically reach stress balance and stop rotating when the pressing ball head (201a) reaches the end position which simultaneously presses against the side walls on two sides of the V-shaped groove (012).

2. The shift angle deviation detecting device of a parking brake pad according to claim 1, further comprising an arc length measuring mechanism (30) for measuring an arc length over which any point on said arc surface (203a) rotates; the arc length measuring mechanism (30) includes: the device comprises a first winding piece (301), a first tensioning piece (302) used for tensioning the first winding piece (301), and a displacement sensor (303), wherein one end of the first winding piece (301) is connected with the pressure applying mechanism (20), a part of the first winding piece (301) is tightly wound on the arc surface (203a) and is coaxial with the arc surface (203a), the other end of the first winding piece (301) is a free end, the free end of the first winding piece (301) can move in a straight line along with the rotation of the pressure applying mechanism (20), and the displacement sensor (303) is used for measuring the straight line moving distance of the free end of the first winding piece (301).

3. The shift angle deviation detecting device of a parking brake pad according to claim 2, further comprising a weight mechanism (40) for applying a rotational torque to the pressing mechanism (20) to offset the rotational torque applied to the pressing mechanism (20) from the arc length measuring mechanism (30).

4. The shift angle deviation detecting device of a parking positioning plate according to claim 3, wherein said weight mechanism (40) includes: a second winding member (401) and a second tensioning member (402) for tensioning the second winding member (401), wherein one end of the second winding member (401) is connected with the pressing mechanism (20), a part of the second winding member (401) is tightly wound on the arc surface (203a) and is coaxial with the arc surface (203a), the other end of the second winding member (401) is a free end, and the free end of the second winding member (401) can move along a straight line along with the rotation of the pressing mechanism (20).

5. The shift angle deviation detecting device of a parking positioning plate according to claim 4, wherein the first and second tightening members (302, 402) tighten the first and second winding members (301, 401), respectively, using their own weight.

6. The shift angle deviation detecting device of a parking brake lever according to claim 5, wherein the pressing mechanism (20) rotates in a horizontal plane, the arc length measuring mechanism (30) includes a first direction changing member (304), the weight mechanism (40) includes a second direction changing member (403), and a free end of the first winding member (301) and a free end of the second winding member (401) are changed to a vertical direction by bypassing the first direction changing member (304) and the second direction changing member (403), respectively.

7. The shift angle deviation detecting device of a parking brake pad according to any one of claims 1 to 6, wherein the pressing mechanism (20) is provided with a shaft hole (203b), the positioning mechanism (10) includes a positioning shaft (101) and a positioning pin (102), the positioning shaft (101) is in clearance fit with the shaft hole (203b) and in clearance fit with a connecting hole (011) of the parking brake pad (01) to be tested, the positioning shaft (101) is provided with a positioning hole (101a) in a radial direction, and the positioning pin (102) is in clearance fit with the positioning hole (101a) and in clearance fit with a pin hole (013) of the parking brake pad (01) to be tested.

8. The parking brake plate shift angle deviation detecting device according to any one of claims 2-6, characterized in that the detecting device further comprises a drive mechanism (50), the drive mechanism (50) comprising: a rotary driving piece for driving the pressing mechanism (20) to rotate and a movable driving piece (503) for driving a pressing ball head (201a) of the pressing mechanism (20) to move so as to contact or separate the pressing ball head and the side wall of the V-shaped groove (012).

9. The device for detecting a deviation of a shift angle of a parking brake pad according to claim 8, further comprising a control mechanism (60), wherein the control mechanism (60) comprises an electronic control module (601) communicatively connected to the driving mechanism (50) and a calculation module (602) communicatively connected to the displacement sensor (303), and wherein the calculation module (602) is configured to calculate an actual value of an angle rotated by the pressing mechanism (20) according to data measured by the displacement sensor (303) and a prestored radius of the arc surface (203a), and calculate a deviation of a shift angle according to the actual value and a prestored design value.

10. A detection method of a shift angle deviation detecting device according to any one of claims 1 to 9, characterized in that:

positioning a parking positioning plate (01) to be measured by using the positioning mechanism (10);

adjusting the pressure applying ball head (201a) to the initial position, and enabling the pressure applying ball head (201a) to continuously apply pressure to one side wall of a V-shaped groove (012) of a parking positioning plate (01) until the pressure applying mechanism (20) rotates under the reaction force of one side wall of the V-shaped groove (012) to drive the pressure applying ball head (201a) to reach the final position;

measuring the arc length of any point on the arc surface (203a) of the pressing mechanism (20) rotating in the process that the pressing ball head (201a) reaches the end point position from the initial position, calculating the actual value of the angle of the pressing mechanism (20) rotating according to the arc length and the radius of the arc surface (203a), and taking the difference between the calculated actual value and the design value determined in the product design process to obtain the shift angle deviation.