Dry type fixed brake and assembling method

Abstract

The invention relates to the field of brakes, and discloses a dry-type fixed brake and an assembling method.A brake driving mechanism is arranged in a first caliper body or / and a second caliper body and drives a brake block to brake, a first mounting cavity is formed in the outer end face of the first caliper body, and a second mounting cavity is formed in the inner side end face of the first caliper body; the brake driving mechanism is mounted in the first mounting cavity and the second mounting cavity, connected with the brake block and comprises a driving motor and a transmission mechanism, the driving motor is mounted in the second mounting cavity, the transmission mechanism is mounted in the first mounting cavity, and the driving motor is connected with the transmission mechanism to drive the transmission mechanism to move. The transmission mechanism drives the brake block to axially move; a top cover is arranged at the upper end of the installation cavity, and the transmission mechanism is installed in a space formed by the top cover and the second installation cavity. The brake is reliable in braking, has the appearance and performance of fixed calipers, and can be electronically controlled at the same time.

Description

Technical Field

[0001] The present invention relates to the field of brakes, and mainly relates to a dry fixed brake and an assembly method thereof. Background Art

[0002] Traditional fixed brakes generally use hydraulic pressure for driving braking. They have the advantages of reliable braking, neat appearance, and small overall size, and are generally applied to high-end vehicles. With the popularization of electrification, it is an inevitable trend for vehicles to adopt electronic control. In the field of parking brakes, there have been many technological breakthroughs and attempts in electronic braking. For example, the applicant's prior patent CN214325076U applied for an electronic parking brake control system for motor vehicles. However, this kind of parking brake and the fixed brake belong to two sets of solutions and cannot be replaced and translated. There is also no electronic driving method for fixed brakes in the existing technical solutions. Summary of the Invention

[0003] The present invention aims at the shortcomings in the prior art and provides a dry fixed brake and an assembly method thereof.

[0004] A dry fixed brake includes a caliper body. The caliper body includes a braking area in the middle area, a first caliper body outside the braking area, and a second caliper body inside the braking area. The braking area is a notch structure, and the brake block is located in the braking area. Defining the direction along the movement of the brake block as the axial direction, a braking drive mechanism is provided in the first caliper body or / and the second caliper body. The braking drive mechanism drives the brake block to perform braking. An installation cavity one is provided on the outer end face of the first caliper body, and an installation cavity two is provided on the inner end face of the first caliper body. The braking drive mechanism is installed in the installation cavity one and the installation cavity two, and the braking drive mechanism is connected to the brake block. The braking drive mechanism includes a drive motor and a transmission mechanism. The drive motor is installed in the installation cavity two, and the transmission mechanism is installed in the installation cavity one. The drive motor is connected to the transmission mechanism to drive the transmission mechanism to move, and the transmission mechanism drives the brake block to perform axial movement; a top cover is provided at the upper end of the installation cavity, and the transmission mechanism is installed in the space formed by the top cover and the installation cavity two.

[0005] Preferably, the installation cavity one includes a first chamber in the middle position and second chambers on both sides of the first chamber. The first chamber is communicated with the installation cavity two. An output assembly is installed in the first chamber. The output shaft of the drive motor is connected to the output assembly and drives the output assembly to move. A transmission gear is installed in the second chamber. The output assembly and the transmission gear are engaged. An internal thread is provided in the middle of the transmission gear. The transmission mechanism further includes a drive shaft. An external thread is provided on the outer side surface of the drive shaft. The drive shaft is engaged with the internal thread of the transmission gear. The rotation of the transmission gear drives the drive shaft to perform axial movement;

[0006] A guide cavity is provided on the lower end face of the upper caliper body. The guide cavity is communicated with the second chamber. The drive shaft extends into the guide cavity and can act on the brake block.

[0007] Preferably, the output component is a planetary reduction gear mechanism, including a first gear connected to the driving motor in the middle, a plurality of second gears meshing with the outer ring of the first gear, and a tooth ring meshing with the outer rings of the second gears. Transmission teeth are provided on both the inner and outer rings of the tooth ring. The first gear and the second gears are both located inside the tooth ring. The inner ring of the tooth ring meshes with the second gears, and the outer ring of the tooth ring meshes with the transmission gear. A fixing groove is provided on the bottom surface of the first installation cavity. A bracket is installed in the fixing groove, and the second gears are installed on the bracket. A through hole is provided on the bottom surface of the fixing groove and communicates with the second installation cavity. The output shaft of the driving motor passes through the through hole and is connected to the first gear.

[0008] Preferably, an installation seat is provided at the upper end of the tooth ring. The installation seat is fixedly connected to the tooth ring and is coaxially arranged. An installation column is provided on the inner side of the top cover. The installation seat is installed on the installation column through a bearing.

[0009] Preferably, a guiding groove is provided on the inner side of the top cover. The upper end of the driving shaft is inserted into the guiding groove and can move up and down along the guiding groove. A piston sleeve is provided in the guiding cavity. The driving shaft is slidably connected to the piston sleeve and is used to push the piston sleeve to move.

[0010] Preferably, the number of the second grooves is two, and the driving shaft corresponds to the second grooves one by one.

[0011] Preferably, it further includes a support bearing for supporting the transmission gear. The support bearing is installed on the bottom surface of the second groove. An installation groove for installing the support bearing is provided on the top cover. The support bearing is a needle bearing.

[0012] Preferably, a stepped groove is provided at the opening of the second installation cavity. The installation seat of the driving motor is fixed in the stepped groove by bolts, and the installation seat is flush with the end surface around the second installation cavity.

[0013] Preferably, a plug is provided on the side surface of the first pliers body close to the pliers mouth. The plug is connected to the driving motor. The first pliers body and the second pliers body are of an integrally formed structure.

[0014] An assembly method of a dry fixed brake, for assembling the above-mentioned dry fixed brake, includes the following steps:

[0015] Step 1: Prepare the pliers body, the top cover, the driving motor, and the transmission mechanism. The transmission mechanism includes a first gear, a second gear, a tooth ring, a transmission gear, and a driving shaft. It also includes a bracket and a supporting bearing.

[0016] Step 2: Install the second gears on the bracket. The tooth ring is installed on the top cover through a bearing. The transmission gear is installed in the second groove of the first installation cavity through a bearing.

[0017] Step 3: Insert the drive motor into the second installation cavity from the braking area and fix it to the caliper body with bolts; assemble the first gear with the output shaft of the drive motor, and the first gear meshes with the second gears distributed around it.

[0018] Step 4: Hermetically cover the top cover equipped with the toothed ring outside the first assembly cavity and position the bearing seat of the transmission gear. The outer ring of the toothed ring meshes with the transmission gear, and the inner ring meshes with the second gears; then fix the top cover with bolts.

[0019] Step 5: Assemble the drive shaft. The drive shaft extends from the guide cavity into the second groove, is in threaded fit with the inner ring of the transmission gear, and its upper end extends into the guide groove opened on the top cover.

[0020] Step 6: Install the brake block and the piston sleeve. The piston sleeve is installed in the guide cavity and sleeved on the lower end of the drive shaft. The piston sleeve and the drive shaft are in sliding connection.

[0021] Compared with the prior art, the present solution has the following beneficial effects: The overall shape of the designed brake is basically the same as that of the existing fixed brake, with a simple shape and high integration level. Moreover, the design of the inner and outer side grooved structure facilitates later maintenance. At the same time, the transmission mechanism can be selected according to actual needs, with large braking force and fast response speed. At the same time, the caliper body of the present solution can be integrally designed, greatly improving the strength of the caliper body. Description of the Drawings

[0022] Figure 1 It is a schematic diagram of the overall structure.

[0023] Figure 2 It is Figure 1 the front view of

[0024] Figure 3 It is Figure 2 the sectional view of

[0025] Figure 4 It is Figure 1 the top view of

[0026] Figure 5 It is Figure 4 the sectional view of

[0027] Figure 6 It is a schematic diagram of the transmission structure.

[0028] The technical names of the reference numerals in the figure are: 1 - pliers body, 2 - braking area, 3 - first pliers body, 4 - second pliers body, 5 - braking drive mechanism, 6 - first installation cavity, 7 - second installation cavity, 8 - drive motor, 9 - transmission mechanism, 10 - top cover, 11 - first chamber, 12 - second chamber, 13 - output assembly, 29 - transmission gear, 14 - drive shaft, 15 - guiding cavity, 16 - first gear, 17 - second gear, 18 - toothed ring, 19 - fixing groove, 20 - bracket, 21 - mounting seat, 22 - mounting post, 23 - guiding groove, 24 - piston sleeve, 25 - supporting bearing, 26 - mounting groove, 27 - plug, 28 - limiting groove. Detailed implementation manners

[0029] The present invention will be further described in detail below in conjunction with the drawings and embodiments.

[0030] Embodiment 1

[0031] A dry fixed brake includes a pliers body 1. The pliers body 1 includes a braking area 2 in the middle area, a first pliers body 3 outside the braking area 2, and a second pliers body 4 inside the braking area 2. The braking area 2 is a notch structure, and the brake pads are located in the braking area 2. In this embodiment, the pliers body 1 is an integrally formed structure. The braking area 2 is the pliers opening in the middle. When installed, the brake disc is located in the braking area 2, that is, between the two brake pads in the braking area 2. The inner and outer sides are the names when in use. Specifically, the inner and outer sides are determined by the design of the installation part, which does not affect the protection scope of this solution. In this solution Figure 1 the upper pliers body 1 is defined as the first pliers body 3, and the orientations of up, down, left, right, front, and back are also Figure 1 used as a reference.

[0032] It is defined that the direction along the movement direction of the brake pads is the axial direction. A braking drive mechanism 5 is arranged in the first pliers body 3 or / and the second pliers body 4, and the braking drive mechanism 5 drives the brake pads to perform braking. In this solution, the same braking structure is arranged in the first pliers body 3 and the second pliers body 4, so that the two sides of the brake disc can be braked simultaneously during braking. For the convenience of description, the braking structure of the first pliers body 3 is used to introduce this solution.

[0033] An installation cavity one 6 is arranged on the outer end face of the first pliers body 3, and an installation cavity two 7 is arranged on the inner end face of the first pliers body 3. The braking drive mechanism 5 is installed in the installation cavity one 6 and the installation cavity two 7. The shape of the installation cavity is adapted to the transmission structure to be assembled. The braking drive mechanism 5 is connected to the brake pads, and the braking drive mechanism 5 can drive the brake pads to perform braking actions.

[0034] The braking drive mechanism 5 includes a drive motor 8 and a transmission mechanism 9. The drive motor 8 is installed in the second installation cavity 7, and its output shaft extends upward into the first installation cavity 6. The transmission mechanism 9 is installed in the first installation cavity 6. The drive motor 8 is connected to the transmission mechanism 9 to drive the transmission mechanism 9 to move, and the transmission mechanism 9 drives the brake block to move axially. A top cover 10 is provided at the upper end of the installation cavity, and the transmission mechanism 9 is installed in the space formed by the top cover 10 and the second installation cavity 7.

[0035] The first installation cavity 6 includes a first groove chamber 11 in the middle position and second groove chambers 12 on both sides of the first groove chamber 11. The first groove chamber 11 communicates with the second installation cavity 7. An output component 13 is installed in the first groove chamber 11. In this embodiment, the output component 13 functions to reduce speed and increase torque. The output shaft of the drive motor 8 is connected to the output component 13 and drives the output component 13 to move. A transmission gear 29 is installed in the second groove chamber 12. The output component 13 meshes with the transmission gear 29. An internal thread is provided in the middle of the transmission gear 29. The transmission mechanism 9 further includes a drive shaft 14. An external thread is provided on the outer side of the drive shaft 14. The drive shaft 14 meshes with the internal thread of the transmission gear 29. The rotation of the transmission gear 29 drives the drive shaft 14 to move axially.

[0036] A guide cavity 15 is provided on the lower end surface of the upper jaw body 1. The guide cavity 15 communicates with the second groove. The drive shaft 14 extends into the guide cavity 15 and can act on the brake block.

[0037] In this solution, the output component 13 is a planetary reduction gear mechanism, including a first gear 16 connected to the drive motor 8 in the middle, a plurality of second gears 17 meshing with the outer ring of the first gear 16, and a tooth ring 18 meshing with the outer rings of the second gears 17. Transmission teeth are provided on both the inner and outer rings of the tooth ring 18. The first gear 16 and the second gears 17 are both located inside the tooth ring 18. The inner ring of the tooth ring 18 meshes with the second gears 17, and the outer ring of the tooth ring 18 meshes with the transmission gear 29. A fixing groove 19 is provided on the bottom surface of the first installation cavity 6. A bracket 20 is installed in the fixing groove 19. The second gears 17 are installed on the bracket 20. A through hole is provided on the bottom surface of the fixing groove 19 and communicates with the second installation cavity 7. The output shaft of the drive motor 8 passes through the through hole and is connected to the first gear 16. Specifically, in this solution, the number of the second gears 17 is 3. The first gear 16 and the second gears 17 are both installed on the bracket 20. The tooth ring 18 and the first gear 16 are coaxially arranged.

[0038] In this solution, a mounting seat 21 is provided at the upper end of the gear ring 18. The mounting seat 21 is fixedly connected to the gear ring 18 and coaxially arranged. An installation column 22 is arranged inside the top cover 10, and the mounting seat 21 is mounted on the installation column 22 through a bearing. The mounting seat 21 can be completely sealed at the upper end of the gear ring 18. However, in this embodiment, in order to reduce the weight, the mounting seat 21 and the gear ring 18 are mounted and connected through connecting wings, and the number of the connecting wings is three.

[0039] Among them, a guide groove 23 is arranged inside the top cover 10. The upper end of the driving shaft 14 is inserted into the guide groove 23 and can move up and down along the guide groove 23. A piston sleeve 24 is arranged inside the guide cavity 15, and the driving shaft 14 is slidably connected inside the piston sleeve 24 to push the piston sleeve 24 to move. The guide groove 23 is coated with grease, and the driving shaft 14 can slide up and down. A limiting structure for restricting its circumferential rotation is arranged on the circumferential side surface of the driving shaft 14, and the limiting structure cooperates with the guide cavity 15 or the top cover 10 to achieve circumferential limitation. Specifically, in this embodiment, a limiting groove 28 is opened on the side surface of the upper end of the driving shaft 14, and a limiting block matching the limiting groove 28 is opened in the guide groove 23. The limiting groove 28 cooperates with the limiting block, and the limiting groove 28 is axially arranged.

[0040] In this embodiment, the number of the second grooves is two, and the driving shafts 14 correspond to the second grooves one by one. That is, each brake block is driven by two driving shafts 14, which are respectively located on the left and right sides of the brake block, so as to ensure that the brake block can brake smoothly and ensure the stability of braking.

[0041] Since the braking force will be transmitted to the transmission gear 29 through the driving rod during the braking process, the requirements for the bearing for installing the transmission gear 29 are very high. In this solution, the bearing for supporting the transmission gear 29 is defined as a support bearing 25. The support bearing 25 is installed on the bottom surface of the second groove, and an installation groove 26 for installing the support bearing 25 is arranged on the top cover 10; the support bearing 25 is a needle roller bearing, and the needle roller bearing can bear a greater braking force axially to ensure the safety of components.

[0042] In this solution, in order to achieve a flush design, a stepped groove is arranged at the opening of the second installation cavity 7. The mounting seat 21 of the driving motor 8 is fixed in the stepped groove through bolts, and the mounting seat 21 is flush with the end surface around the second installation cavity 7. Of course, the design of other structures should also fall within the protection scope of this solution. The creativity of this solution lies in that the driving motor 8 can be inserted into the second installation cavity 7 from the braking area 2 and then fixed at this position, greatly reducing the overall size axially and providing a basic condition for the design of the fixed caliper.

[0043] Secondly, a plug 27 is provided on the side of the first jaw body 3 close to the jaw side, and the plug 27 is connected to the drive motor 8; the first jaw body 3 and the second jaw body 4 are of an integrally formed structure. This structural design has no redundant wire harness for the motor, facilitating the bus integrated design and being safer close to the jaw side.

[0044] The overall working process of this brake is as follows:

[0045] The drive motor 8 drives the first gear 16 to rotate, and the planetary reduction mechanism is used to reduce the speed and increase the torque. Then, the ring gear 18 drives the transmission gear 29 to rotate through meshing, and the transmission gear 29 drives the axially moving drive shaft 14 in a threaded fit. The drive shaft 14 pushes the piston sleeve 24 brake block to brake. After the braking is released, the motor rotates in reverse, and then the drive shaft 14 disengages from applying force to the piston sleeve 24. The brake block and the piston return under the action of the return spring leaf.

[0046] Embodiment 2

[0047] The difference between this embodiment and Embodiment 1 is that the output assembly 13 drives the transmission gear 29 to rotate through other transmission structures.

[0048] Embodiment 3

[0049] This embodiment discloses an assembly method of the brake in Embodiment 1, including the following steps:

[0050] Step 1: Prepare the jaw body 1, the top cover 10, the drive motor 8, and the transmission mechanism 9. The transmission mechanism 9 includes the first gear 16, the second gear 17, the ring gear 18, the transmission gear 29, and the drive shaft 14; it also includes the bracket 20 and the matching bearings;

[0051] Step 2: Install the second gear 17 on the bracket 20, and install the ring gear 18 on the top cover 10 through a bearing; install the transmission gear 29 in the second groove of the first installation cavity 6 through a bearing;

[0052] Step 3: Insert the drive motor 8 into the second installation cavity 7 from the braking area 2 and fix it to the jaw body 1 with bolts; assemble the first gear 16 and the output shaft of the drive motor 8, and the first gear 16 meshes with the second gears 17 distributed around it;

[0053] Step 4: Sealingly cover the top cover 10 equipped with the ring gear 18 outside the first assembly cavity and position the bearing seat of the transmission gear 29. The outer ring of the ring gear 18 meshes with the transmission gear 29, and the inner ring meshes with the second gear 17; then fix the top cover 10 with bolts;

[0054] Step Five: Assemble the drive shaft 14. The drive shaft 14 extends into the second groove from within the guiding cavity 15 and is in threaded fit with the inner ring of the transmission gear 29, and its upper end extends into the guiding groove 23 formed in the top cover 10.

[0055] Step Six: Install the brake block and the piston sleeve 24. The piston sleeve 24 is installed within the guiding cavity 15 and sleeved on the lower end of the drive shaft 14. The piston sleeve 24 and the drive shaft 14 are in sliding connection.

Claims

1. A dry fixed brake, characterized in that: It includes a pliers body (1). The pliers body (1) includes a braking area (2) in the middle area, a first pliers body (3) outside the braking area (2), and a second pliers body (4) inside the braking area (2). The braking area (2) is a notch structure, and a brake block is located in the braking area (2). The axial direction is defined as the direction of the movement of the brake block. A braking drive mechanism (5) is arranged in the first pliers body (3) or / and the second pliers body (4). The braking drive mechanism (5) drives the brake block to brake. An installation cavity one (6) is arranged on the outer end face of the first pliers body (3), and an installation cavity two (7) is arranged on the inner end face of the first pliers body (3). The braking drive mechanism (5) is installed in the installation cavity one (6) and the installation cavity two (7). The braking drive mechanism (5) is connected to the brake block. The braking drive mechanism (5) includes a drive motor (8) and a transmission mechanism (9). The drive motor (8) is installed in the installation cavity two (7), and the transmission mechanism (9) is installed in the installation cavity one (6). The drive motor (8) is connected to the transmission mechanism (9) to drive the transmission mechanism (9) to move, and the transmission mechanism (9) drives the brake block to move axially; A top cover (10) is arranged at the upper end of the installation cavity. The transmission mechanism (9) is installed in the space formed by the top cover (10) and the installation cavity two (7).

2. The dry fixed brake according to claim 1, characterized in that: The transmission mechanism (9) includes an output component (13) and a transmission gear (29). The installation cavity one (6) includes a first groove chamber (11) in the middle position and second groove chambers (12) on both sides of the first groove chamber (11). The first groove chamber (11) communicates with the installation cavity two (7). The output component (13) is installed in the first groove chamber (11). The output shaft of the drive motor (8) is connected to the output component (13) and drives the output component (13) to move. The transmission gear (29) is installed in the second groove chamber (12). The output component (13) and the transmission gear (29) are meshed. An internal thread is arranged in the middle of the transmission gear (29). The transmission mechanism (9) further includes a drive shaft (14). An external thread is arranged on the outer side surface of the drive shaft (14). The drive shaft (14) is meshed with the internal thread of the transmission gear (29). The rotation of the transmission gear (29) drives the drive shaft (14) to move axially; A guiding cavity (15) is arranged on the lower end face of the upper pliers body (1). The guiding cavity (15) communicates with the second groove. The drive shaft (14) extends into the guiding cavity (15) and can act on the brake block.

3. A dry fixed brake according to claim 2, characterized in that: The output component (13) is a planetary reduction gear mechanism, including a first gear (16) with its middle connected to the driving motor (8), a plurality of second gears (17) meshing with the outer ring of the first gear (16), and a toothed ring (18) meshing with the outer rings of the second gears (17). The inner and outer rings of the toothed ring (18) are both provided with transmission teeth. The first gear (16) and the second gears (17) are both located inside the toothed ring (18). The inner ring of the toothed ring (18) meshes with the second gears (17), and the outer ring of the toothed ring (18) meshes with the transmission gear (29). A fixing groove (19) is provided on the bottom surface of the first installation cavity (6). A bracket (20) is installed in the fixing groove (19). The second gears (17) are installed on the bracket (20). A through hole is provided on the bottom surface of the fixing groove (19) and communicates with the second installation cavity (7). The output shaft of the driving motor (8) passes through the through hole and is connected to the first gear (16).

4. A dry fixed brake according to claim 3, characterized in that: An installation seat (21) is provided at the upper end of the toothed ring (18). The installation seat (21) is fixedly connected to the toothed ring (18) and is coaxially arranged. An installation column (22) is provided inside the top cover (10). The installation seat (21) is installed on the installation column (22) through a bearing.

5. A dry fixed brake according to claim 2, characterized in that: A guiding groove (23) is provided inside the top cover (10). The upper end of the driving shaft (14) is inserted into the guiding groove (23) and can move up and down along the guiding groove (23). A piston sleeve (24) is provided inside the guiding cavity (15). The driving shaft (14) is slidably connected inside the piston sleeve (24) for pushing the piston sleeve (24) to move.

6. A dry fixed brake according to claim 2 or 3 or 4 or 5 or 6, characterized in that: The number of the second grooves is two, and the driving shaft (14) corresponds to the second grooves one by one.

7. A dry fixed brake according to claim 3, characterized in that: It further includes a support bearing (25) for supporting the transmission gear (29). The support bearing (25) is installed on the bottom surface of the second groove. An installation groove (26) for installing the support bearing (25) is provided on the top cover (10). The support bearing (25) is a needle bearing.

8. A dry fixed brake according to claim 1 or 2 or 3 or 4 or 5 or 6, characterized in that: A stepped groove is provided at the opening of the second installation cavity (7). The installation seat (21) of the driving motor (8) is fixed in the stepped groove by bolts, and the installation seat (21) is flush with the end surface around the second installation cavity (7).

9. A dry fixed brake according to claim 1 or 2 or 3 or 4 or 5 or 6, characterized in that: A plug (27) is provided on the side of the first pliers body (3) close to the pliers mouth. The plug (27) is connected to the driving motor (8). The first pliers body (3) and the second pliers body (4) are of an integrally formed structure. A limiting structure for restricting the circumferential rotation is provided on the circumferential side surface of the driving shaft (14). The limiting structure cooperates with the guiding cavity (15) or the top cover (10) to achieve circumferential limitation. A limiting groove (28) is provided on the upper end side surface of the driving shaft (14). A limiting block matching the limiting groove (28) is provided in the guiding groove (23). The limiting groove (28) cooperates with the limiting block, and the limiting groove (28) is axially arranged.

10. An assembly method for a dry fixed brake, characterized in that: Assembling the dry fixed brake according to any one of claims 1 to 9 includes the following steps: Step 1. Prepare the pliers body (1), top cover (10), drive motor (8), and transmission mechanism (9). The transmission mechanism (9) includes a first gear (16), a second gear (17), a toothed ring (18), a transmission gear (29), and a drive shaft (14); also includes a bracket (20) and supporting bearings. Step 2. Install the second gear (17) on the bracket (20), and install the toothed ring (18) on the top cover (10) through a bearing; install the transmission gear (29) in the second groove of the first installation cavity (6) through a bearing. Step 3. Insert the drive motor (8) into the second installation cavity (7) from the braking area (2) and fix it to the pliers body (1) with bolts; assemble the first gear (16) and the output shaft of the drive motor (8), and the first gear (16) meshes with the second gears (17) distributed around it. Step 4. Hermetically cover the top cover (10) equipped with the toothed ring (18) outside the first assembly cavity and position the bearing seat of the transmission gear (29). The outer ring of the toothed ring (18) meshes with the transmission gear (29), and the inner ring meshes with the second gear (17); then fix the top cover (10) with bolts. Step 5. Assemble the drive shaft (14). The drive shaft (14) extends from the guiding cavity (15) into the second groove and is in threaded cooperation with the inner ring of the transmission gear (29), and the upper end extends into the guiding groove (23) opened on the top cover (10). Step 6. Install the brake block and the piston sleeve (24). The piston sleeve (24) is installed in the guiding cavity (15) and sleeved on the lower end of the drive shaft (14). The piston sleeve (24) and the drive shaft (14) are in sliding connection.

Images