A parking pawl and a method of manufacturing the same

Abstract

The application discloses a parking ratchet, comprising: a main ratchet plate, a first spline for connecting a main shaft is arranged in the middle position of the main ratchet plate, a plurality of first clamping holes for clamping with a pawl are symmetrically arranged on the outer wall of the first ratchet plate; two side ratchet plates are respectively embedded on the two end surfaces of the main ratchet plate, and a second spline is arranged on each side ratchet plate corresponding to the first spline, and a plurality of second clamping holes are arranged on each side ratchet plate corresponding to the plurality of first clamping holes; the hardness of the two side ratchet plates is greater than that of the main ratchet plate. The application realizes the application of different metal materials in the parking ratchet by the main ratchet plate and the two side ratchet plates, greatly improves the physical performance of the parking ratchet, and has the beneficial effects of enhancing wear resistance, improving bearing capacity, improving fatigue strength and improving safety.

Description

TECHNICAL FIELD

[0001] The present application relates to a ratchet wheel, more particularly, the present application relates to a parking ratchet wheel and a manufacturing method thereof. BACKGROUND

[0002] Light vehicles generally include three kinds of braking systems: driving braking system, parking braking system and auxiliary braking system. The parking braking system is used to stabilize the vehicle after parking, avoid accidents caused by vehicle sliding when parking on a slope, and is applied to automatic transmission vehicles. The locking mechanism in the parking braking system is usually composed of a parking ratchet wheel and a parking pawl. When the car completes the P-gear command, the locking of the parking is realized by pressing the tooth top of the parking pawl into the notch of the parking ratchet wheel.

[0003] The parking ratchet wheel is located in the differential for high-torque working condition, arranged in the intermediate shaft for medium-torque working condition, and arranged in the input shaft for low-torque working condition. When the locking mechanism is arranged at the rear end of the transmission system, the torque to be locked is usually as high as several thousand newton-meters. Therefore, in order to improve the physical performance of the parking ratchet wheel, the parking ratchet wheel is usually designed to be thick and heavy, and is made of a single metal material by casting process or mechanical processing process.

[0004] However, only the optimization of the thickness and material of the parking ratchet wheel, in the case of extreme working condition (30% slope, full load of the vehicle), due to the excessive contact force and friction between the parking ratchet wheel and the parking pawl, the parking ratchet wheel bears a large torque load, and there are still situations of fracture, excessive wear and other situations, which leads to the performance degradation of the parking ratchet wheel, thereby causing parking failure and easily causing accidents due to vehicle sliding. Therefore, how to further improve the physical performance of the parking ratchet wheel is a problem to be solved in this technical field. SUMMARY

[0005] An object of the present application is to solve at least the above problems and / or disadvantages and provide at least the advantages described later.

[0006] To achieve these objects and other advantages and in view of the existing prior art, a parking ratchet wheel is provided.

[0007] A main ratchet plate, a first spline for connecting a main shaft is arranged in the middle position of the main ratchet plate, and a plurality of first notches for engaging with a pawl are symmetrically arranged on the outer wall of the main ratchet plate;

[0008] Two side ratchet plates are respectively embedded in the two end surfaces of the main ratchet plate, and a second spline corresponding to the first spline is arranged in each side ratchet plate, and a plurality of second notches corresponding to the plurality of first notches are arranged in each side ratchet plate;

[0009] The hardness of the two side ratchet plates is greater than the hardness of the main ratchet plate.

[0010] Preferably, the two side ratchet plates are respectively embedded in the end faces of the main ratchet plate in the following manner:

[0011] The main ratchet plate is provided with a plurality of arc-shaped embedding holes along the center of symmetry, the bottom end faces of the two side ratchet plates are respectively integrally provided with a plurality of first arc-shaped embedding blocks, each of the first arc-shaped embedding blocks is respectively embedded in each of the arc-shaped embedding holes, and the bottom end faces of the two side ratchet plates are respectively abutted against the two end faces of the main ratchet plate.

[0012] Preferably, the two end faces of the main ratchet plate are respectively provided with a plurality of arc-shaped embedding grooves along each of the first clamping openings, the bottom end faces of the two side ratchet plates are respectively integrally provided with a plurality of second arc-shaped embedding blocks along each of the second clamping openings, and each of the second arc-shaped embedding blocks is respectively embedded in each of the arc-shaped embedding grooves.

[0013] Preferably, the main ratchet plate is provided with a plurality of arc-shaped embedding holes along the center of symmetry, the bottom end faces of the two side ratchet plates are respectively integrally provided with a plurality of first arc-shaped embedding blocks, each of the first arc-shaped embedding blocks is respectively embedded in each of the arc-shaped embedding holes, and the bottom end faces of the two side ratchet plates are respectively abutted against the two end faces of the main ratchet plate.

[0014] The sleeve ring is integrally provided with a plurality of slide rods at one end, and the top end of each of the slide rods is provided with a clamping head, each of the side ratchet plates is provided with a plurality of slide holes through the first arc-shaped embedding blocks, each of the slide rods is slidably connected in each of the slide holes of the two side ratchet plates, and the sleeve ring is abutted against one of the side ratchet plates.

[0015] The clamping ring is symmetrically provided with a plurality of arc-shaped clamping openings, and each of the arc-shaped clamping openings is clamped with each of the clamping heads. The clamping ring is abutted against the other side ratchet plate.

[0016] Preferably, the clamping ring is connected with the side ratchet plate through a bolt.

[0017] Preferably, the top end faces of each of the side ratchet plates are integrally provided with a reinforcing ring along each of the second splines.

[0018] Preferably, the main ratchet plate is provided as any one of a 40Cr steel main ratchet plate, a 45# steel main ratchet plate, and a 20MnCr5 alloy steel main ratchet plate; and the side ratchet plate is provided as any one of a 316L stainless steel side ratchet plate and a tungsten steel side ratchet plate.

[0019] A method for preparing a parking ratchet, comprising the following steps:

[0020] Step one, selecting a side ratchet plate material, and obtaining two side ratchet plate blanks through a casting process;

[0021] Step two, after removing burrs from the two side ratchet plate blanks through grinding, performing surface treatment on the two side ratchet plate blanks to obtain two side ratchet plates;

[0022] Step three, take a steel round plate and anneal it, then mill a plurality of arc-shaped embedding holes and a plurality of arc-shaped embedding grooves along the center of the steel round plate by a milling machine;

[0023] Step four, embed two side ratchet plates at both ends of the steel round plate through the plurality of arc-shaped embedding holes and the plurality of arc-shaped embedding grooves, and limit the moving positions of the two side ratchet plates through the sleeves and the snap rings;

[0024] Step five, then process the steel round plate into a main ratchet plate, disassemble the two side ratchet plates from the main ratchet plate, and perform a hot surface treatment on the main ratchet plate;

[0025] Step six, embed two side ratchet plates at both ends of the main ratchet plate through the plurality of arc-shaped embedding holes and the plurality of arc-shaped embedding grooves, and limit the moving positions of the two side ratchet plates through the sleeves and the snap rings, to obtain a parking ratchet.

[0026] Preferably, the method for surface treating the side ratchet plate blank is to immerse the side ratchet plate blank in an electrolyte for electrolytic polishing, and the electrolytic polishing is performed for 30-60S under the conditions that the rated working voltage is 5V and the temperature is 60℃.

[0027] Preferably, the method for processing the steel round plate into the main ratchet plate is:

[0028] the peripheral wall of the steel round plate is turned to be equal in diameter to the maximum diameter of the side ratchet plate by a lathe;

[0029] a plurality of first clamping holes are milled on the steel round plate along the plurality of second clamping holes of the side ratchet plate by a milling machine;

[0030] a first spline is wire-cut on the steel round plate along the second spline of the side ratchet plate by a wire-cutting process, to obtain the main ratchet plate.

[0031] The present application at least includes the following beneficial effects:

[0032] Firstly, the present application realizes the application of different metal materials in the parking ratchet by the main ratchet plate and the two side ratchet plates, greatly improves the physical properties of the parking ratchet, and has the beneficial effects of enhancing wear resistance, improving carrying capacity, improving fatigue strength, and improving safety.

[0033] Secondly, in the application, by arranging a plurality of arc-shaped grooves along a plurality of first clamping openings, when the first clamping opening cracks, the cracks are guided by the plurality of arc-shaped grooves, and the cracks crack along any arc-shaped groove, preventing the main ratchet plate from cracking deeply; by a plurality of second arc-shaped blocks integrally formed and protruding along each second clamping opening, the plurality of second arc-shaped blocks play the role of reinforcing ribs to strengthen the structural strength of the second clamping opening, effectively improve the load bearing performance of the second clamping opening, and have the advantages of improving the structural strength and improving the connection stability.

[0034] Other advantages, objects, and features of the present application will be apparent from the following specification, and will be understood by persons skilled in the art. BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1 The figure is a structural schematic diagram of the application.

[0036] Figure 2 The figure is an exploded view of the application.

[0037] Figure 3 The figure is a structural schematic diagram of the main ratchet plate of the application.

[0038] Figure 4 The figure is a structural schematic diagram of the side ratchet plate of the application.

[0039] Figure 5 The figure is a structural schematic diagram of the limiting assembly of the application.

[0040] Figure 6 The figure is a structural schematic diagram of the clamping ring of the application. DETAILED DESCRIPTION

[0041] The application will be further described in detail below with reference to the drawings, so that those skilled in the art can implement the application according to the description. It should be understood that the terms such as "have", "contain" and "include" used herein do not exclude the presence or addition of one or more other elements or combinations thereof. It should be noted that in the description of the application, the orientation or positional relationship indicated by the terms is based on the orientation or positional relationship shown in the drawings, which is only for the purpose of facilitating the description of the application and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application. In addition, the terms "first" and "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance. In the description of the application, unless otherwise explicitly specified and limited, the terms "mount", "provided with", "sleeved / connected", "connected" and the like should be understood broadly, for example, "connected" can be fixedly connected, can be detachably connected, or integrally connected, can be mechanically connected, can be electrically connected, can be directly connected, can be indirectly connected through an intermediate medium, can be connected between two elements, and those skilled in the art can understand the specific meaning of the above terms in the application according to the specific circumstances. In addition, in the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature "above", "over" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "under" and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0042] Figure 1 An implementation form of the application is shown, which comprises:

[0043] A main ratchet plate 1, a first spline 11 for connecting a main shaft is arranged in the middle position of the main ratchet plate 1, and a plurality of first notches 12 for engaging with pawls are symmetrically arranged on the outer wall of the main ratchet plate 1;

[0044] Two side ratchet plates 2 are respectively embedded in the two end faces of the main ratchet plate 1, and each of the side ratchet plates 2 is provided with a second spline 21 corresponding to the first spline 11, and each of the side ratchet plates 2 is provided with a plurality of second notches 22 corresponding to the plurality of first notches 12;

[0045] The hardness of the two side ratchet plates 2 is greater than the hardness of the main ratchet plate 1.

[0046] Working principle: through the first spline 11 main ratchet plate 1 and the main shaft to establish the connection, two side ratchet plate 2 is respectively through the second spline 21 and the main shaft to establish the connection;When parking, the pawl and the first notch 12 and the second notch 22 of two side ratchet plate 2 are clamped, so that the main ratchet plate 1 and two side ratchet plate 2 bear the torque load of the main shaft together, and then the two side ratchet plate 2 and the two end surfaces of the main ratchet plate 1 are embedded, so that the two side ratchet plate 2 and the main ratchet plate 1 are uniformly stressed;And the hardness of the side ratchet plate 2 is greater than that of the main ratchet plate 1, so that the second notch 22 of the side ratchet plate 2 has stronger wear resistance, and the second notch 22 of the two side ratchet plate 2 can prevent the first notch 12 of the main ratchet plate 1 from being excessively worn, the stress intensity of the first spline 11 is reduced through the two second splines 21, and the first spline 11 is prevented from collapsing;When the torque load of the main shaft is too large to cause any side ratchet plate 2 or main ratchet plate 1 to collapse, the parking function can be realized through the cooperation of a single side ratchet plate 2 and a main ratchet plate 1, or through two side ratchet plates 2, effectively preventing the occurrence of the phenomenon of the car. In this technical solution, the parking ratchet is formed by the main ratchet plate 1 and the two side ratchet plates 2, which realizes the application of different metal materials in the parking ratchet, greatly improves the physical properties of the parking ratchet, and has the beneficial effects of enhancing wear resistance, improving carrying capacity, improving fatigue strength and improving safety.

[0047] As in the above scheme, the two side ratchet plates 2 are embedded in the two end surfaces of the main ratchet plate 1 in the following way:

[0048] The main ratchet plate 1 is provided with a plurality of arc-shaped embedding holes 13 along the center of symmetry, and the bottom end surface of each side ratchet plate 2 is integrally formed with a plurality of first arc-shaped embedding blocks 23, each first arc-shaped embedding block 23 is embedded in each arc-shaped embedding hole 13, and the bottom end surface of each side ratchet plate 2 abuts against the two end surfaces of the main ratchet plate 1.

[0049] Working principle: through the embedding of the plurality of first arc-shaped embedding blocks 23 and the plurality of arc-shaped embedding holes 13, a multi-point connection relationship is established between the two side ratchet plates 2 and the main ratchet plate 1, the activity position of the two side ratchet plates 2 on the main ratchet plate 1 is limited, so that the second spline 21 and the second notch 22 are kept in corresponding relationship with the first spline 11 and the first notch 12 respectively, the two side ratchet plates 2 and the main ratchet plate 1 are uniformly stressed when bearing the torque load, and the structure strength of the main ratchet plate 1 is ensured by setting the connecting part of the main ratchet plate 1 as the arc-shaped embedding hole 13, preventing the main ratchet plate 1 from collapsing;The connecting strength of the side ratchet plate 2 and the main ratchet plate 1 is ensured by setting the connecting part of the side ratchet plate 2 as the arc-shaped embedding block 23, preventing the side ratchet plate 2 from separating from the main ratchet plate 1, and this way has the advantages of ensuring the connection stability and the structure strength.

[0050] As in the above scheme, the two end faces of the main ratchet plate 1 are respectively provided with a plurality of arc-shaped embedding grooves 14 along each of the first clamping holes 12, and the bottom end faces of the two side ratchet plates 2 are respectively integrally formed with a plurality of second arc-shaped embedding blocks 24 protruding along each of the second clamping holes 22, and each of the second arc-shaped embedding blocks 24 is respectively embedded in each of the arc-shaped embedding grooves 14.

[0051] Working principle: through the embedding of the plurality of arc-shaped embedding grooves 14 and the plurality of second arc-shaped embedding blocks 24, the connection strength of the main ratchet plate 1 and the two side ratchet plates 2 is further enhanced, and by arranging the plurality of arc-shaped embedding grooves 14 along the plurality of first clamping holes 12, when the first clamping hole 12 cracks, the crack direction is guided by the plurality of arc-shaped embedding grooves 14, so that the crack cracks along any arc-shaped embedding groove 14, preventing the main ratchet plate 1 from cracking deeply; by integrally forming the plurality of second arc-shaped embedding blocks 24 protruding along each of the second clamping holes 22, the second clamping hole 22 has the effect of a reinforcing rib to strengthen the structural strength, effectively improving the load bearing performance of the second clamping hole 22, and has the advantages of improving the structural strength and improving the connection stability.

[0052] As in the above scheme, it further includes a limiting assembly 3, which comprises:

[0053] The sleeve ring 31 is integrally formed with a plurality of slide rods 32 protruding symmetrically at one end, and the top end of each of the slide rods 32 is provided with a clamping head 33, and each of the side ratchet plates 2 is provided with a plurality of slide holes 25 through the plurality of first arc-shaped embedding blocks 23, and each of the slide rods 32 is respectively connected in each of the slide holes 25 of the two side ratchet plates 2, and the sleeve ring 31 abuts against one side of the side ratchet plate 2.

[0054] The clamping ring 34 is symmetrically provided with a plurality of arc-shaped clamping holes 35, and each of the arc-shaped clamping holes 35 is clamped with each of the clamping heads 33, and the clamping ring 34 abuts against the other side of the side ratchet plate 2.

[0055] Working principle: after embedding the main ratchet plate 1 and the two side ratchet plates 2, the plurality of slide rods 32 of the sleeve ring 31 are respectively slid into each of the slide holes 25 of the two side ratchet plates 2, and then the plurality of arc-shaped clamping holes 35 of the clamping ring 34 are clamped with each of the clamping heads 33, so that the sleeve ring 31 and the clamping ring 34 establish a connection relationship, thereby further limiting the movement position of the two side ratchet plates 2 on the main ratchet plate 1, preventing the two side ratchet plates 2 from being separated from the two end faces of the main ratchet plate 1, and having the advantages of guaranteeing the connection stability and improving the integrity.

[0056] As in the above scheme, the clamping ring 34 is connected with the side ratchet plate 2 through the bolt 36. The clamping ring 34 is connected with the side ratchet plate 2 through the bolt 36, which prevents the disengagement of the multiple arc-shaped clamping holes 35 of the clamping ring 34 from the clamping connection of each clamping head 33, thereby further preventing the two side ratchet plates 2 from being disengaged from the two end faces of the main ratchet plate 1, which has the advantages of ensuring connection stability and ensuring connection strength.

[0057] As in the above scheme, the top end face of each side ratchet plate 2 is further integrally formed with a reinforcing ring 26 along each second spline 21. The reinforcing ring 26 further enhances the structural strength and load carrying capacity of each second spline 21, thereby effectively preventing the two side ratchet plates 2 from collapsing at the second spline 21, which has the advantages of enhancing load carrying capacity and improving structural strength.

[0058] As in the above scheme, the main ratchet plate 1 is provided as any one of a 40Cr steel main ratchet plate, a 45# steel main ratchet plate, and a 20MnCr5 alloy steel main ratchet plate; and the side ratchet plate 2 is provided as any one of a 316L stainless steel side ratchet plate and a tungsten steel side ratchet plate. By providing the main ratchet plate 1 as any one of a 40Cr steel main ratchet plate, a 45# steel main ratchet plate, and a 20MnCr5 alloy steel main ratchet plate, the structural strength and load carrying capacity of the main ratchet plate 1 are ensured, and by providing the side ratchet plate 2 as any one of a 316L stainless steel side ratchet plate and a tungsten steel side ratchet plate, the structural strength and load carrying capacity of the side ratchet plate 2 are ensured, which has the advantages of ensuring structural strength and ensuring service life.

[0059] Embodiment:

[0060] A method for preparing a parking ratchet, comprising the following steps:

[0061] Step one, the material of the side ratchet plate is selected as tungsten steel, and two tungsten steel side ratchet plate blanks are obtained through a casting process;

[0062] Step two, after deburring the two tungsten steel side ratchet plate blanks, the tungsten steel side ratchet plate blanks are soaked in an electrolyte for electrolytic polishing, and under the conditions of a rated working voltage of 5V and a temperature of 60℃, the electrolytic polishing is performed for 50S to obtain two tungsten steel side ratchet plates.

[0063] Step three, a 20MnCr5 alloy steel round plate is taken and annealed, and then multiple arc-shaped embedding holes 13 and multiple arc-shaped embedding grooves 14 are milled along the center of the 20MnCr5 alloy steel round plate through a milling machine;

[0064] Step four, two tungsten steel side ratchet plates are respectively embedded in the two ends of the 20MnCr5 alloy steel round plate through the plurality of arc-shaped embedding holes 13 and the plurality of arc-shaped embedding grooves 14, and the movable positions of the two tungsten steel side ratchet plates are limited through the sleeve ring 31 and the snap ring 34;

[0065] Step five, then the peripheral wall of the 20MnCr5 alloy steel round plate is turned to be equal in diameter to the maximum diameter of the tungsten steel side ratchet plate through a lathe, a plurality of first clamping holes 12 are milled on the 20MnCr5 alloy steel round plate along the plurality of second clamping holes 22 of the tungsten steel side ratchet plate through a milling machine, a first spline 11 is wire cut on the 20MnCr5 alloy steel round plate along the second spline 21 of the tungsten steel side ratchet plate through a wire cutting process, and a 20MnCr5 alloy steel main ratchet plate is obtained; then the two tungsten steel side ratchet plates are detached from the 20MnCr5 alloy steel main ratchet plate, and the 20MnCr5 alloy steel main ratchet plate is subjected to a hot surface treatment;

[0066] Step six, two tungsten steel side ratchet plates are respectively embedded in the two ends of the 20MnCr5 alloy steel main ratchet plate through the plurality of arc-shaped embedding holes 13 and the plurality of arc-shaped embedding grooves 14, and the movable positions of the two tungsten steel side ratchet plates are limited through the sleeve ring 31 and the snap ring 34, and a parking ratchet is obtained.

[0067] Although the embodiments of the present application have been disclosed as above, it is not limited to the application listed in the specification and the embodiments, and can be fully applied to various fields suitable for the present application, and other modifications can be easily realized by those skilled in the art, and therefore the present application is not limited to specific details and the figures shown and described herein, without departing from the general concept defined by the claims and the equivalent scope.

Claims

1. A parking ratchet, characterized in that, include: The main ratchet plate has a first spline for connecting the main shaft at its middle position, and the outer wall of the main ratchet plate has multiple first slots symmetrically provided for engaging with the pawl. Two side ratchet plates are respectively fitted into the two end faces of the main ratchet plate, and each side ratchet plate is provided with a second spline corresponding to the first spline, and each side ratchet plate is provided with a plurality of second slots corresponding to a plurality of first slots. The hardness of the two side ratchet plates is greater than that of the main ratchet plate.

2. The parking ratchet according to claim 1, characterized in that, The two side ratchet plates are respectively fitted into the two end faces of the main ratchet plate in the following manner: The main ratchet plate has multiple arc-shaped inserts symmetrically arranged around its center. The bottom end face of each side ratchet plate is integrally formed with multiple first arc-shaped inserts protruding from it. Each first arc-shaped insert is respectively fitted into the arc-shaped insert, and the bottom end face of the two side ratchet plates abuts against the two end faces of the main ratchet plate.

3. The parking ratchet according to claim 2, characterized in that, The two ends of the main ratchet plate are provided with multiple arc-shaped grooves along each of the first slots. The bottom ends of the two side ratchet plates are provided with multiple second arc-shaped inserts integrally formed and protruding along each of the second slots, and each of the second arc-shaped inserts is respectively fitted into each of the arc-shaped grooves.

4. The parking ratchet according to claim 3, characterized in that, It also includes a limit component, which includes: A collar has multiple sliding rods symmetrically and integrally formed at one end, and each sliding rod has a locking head at its top. Each side ratchet plate has multiple sliding holes through multiple first arc-shaped inserts. Each sliding rod is slidably connected in each of the sliding holes of two side ratchet plates. The collar abuts against one side ratchet plate. The retaining ring has multiple arc-shaped latches symmetrically arranged, and each arc-shaped latch engages with each of the retaining heads. The retaining ring abuts against the side ratchet plate on the other side.

5. The parking ratchet according to claim 4, characterized in that, The retaining ring is connected to the side ratchet plate by bolts.

6. The parking ratchet according to claim 1, characterized in that, Each of the side ratchet plates also has an integrally formed reinforcing ring protruding from its top end face along each of the second splines.

7. The parking ratchet according to claim 1, characterized in that, The main ratchet plate is set to any one of 40Cr steel main ratchet plate, 45# steel main ratchet plate, and 20MnCr5 alloy steel main ratchet plate; the side ratchet plate is set to any one of 316L stainless steel side ratchet plate and tungsten steel side ratchet plate.

8. The method for preparing a parking ratchet according to claim 4, characterized in that, Includes the following steps: Step 1: Select the material for the side ratchet plates and obtain two side ratchet plate blanks through a casting process; Step 2: After removing the burrs from the two side ratchet plate blanks by grinding, the two side ratchet plate blanks are then surface-treated to obtain two side ratchet plates. Step 3: Take a steel round plate and anneal it. Then, use a milling machine to mill multiple arc-shaped holes and multiple arc-shaped grooves along the center of the steel round plate. Step 4: Using multiple arc-shaped holes and multiple arc-shaped grooves, fit the two side ratchet plates onto both ends of the steel circular plate, and restrict the movement of the two side ratchet plates using collars and retaining rings. Step 5: Then process the steel round plate into the main ratchet plate, remove the two side ratchet plates from the main ratchet plate, and perform heat treatment on the main ratchet plate. Step 6: Using multiple arc-shaped holes and multiple arc-shaped grooves, fit the two side ratchet plates onto the two ends of the main ratchet plate respectively, and restrict the movement of the two side ratchet plates with collars and retaining rings to obtain the parking ratchet.

9. The method for preparing a parking ratchet according to claim 8, characterized in that, The method for surface treatment of the side ratchet plate blank is as follows: the side ratchet plate blank is immersed in an electrolyte for electrolytic polishing, and the electrolytic polishing is carried out for 30~60 seconds under the conditions of rated working voltage of 5V and temperature of 60℃.

10. The method for preparing a parking ratchet according to claim 8, characterized in that, The method for machining a steel round plate into a main ratchet plate is as follows: The peripheral wall of the steel round plate is machined to the same diameter as the maximum diameter of the side ratchet plate using a lathe. Multiple first slots are milled on the steel circular plate using a milling machine along multiple second slots on the side ratchet plate; The first spline is cut into the steel disc by wire cutting along the second spline of the side ratchet plate to obtain the main ratchet plate.

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