Improved wet-type parking and driving integrated brake structure

Abstract

The utility model discloses an improved wet type parking and driving integrated brake structure which comprises a bridge shaft connecting piece, a middle through hole extending rightwards is formed in the middle of the left end of the bridge shaft connecting piece, and a left end hole section extending leftwards is formed in the middle of the right end face of the bridge shaft connecting piece and is a small-diameter hole section. The right end of the stepped hole section is a large-diameter hole section, the left end of a small-diameter hole section of the stepped hole section is communicated with the middle through hole, a half shaft is inserted in the middle through hole and the stepped hole section in a sleeved mode, and a spline transition sleeve is installed at the position, located at the stepped hole section, of the half shaft; the service braking piston block and the parking braking piston block are arranged in an inserted and sleeved mode, so that the total length of the service braking piston block and the parking braking piston block is greatly shortened, the length of an axle connecting piece can be shortened, and occupied space is reduced. A service braking flange plate and a parking braking flange plate which are installed on the service braking piston block and the parking braking piston block can serve as a module to be installed on the axle connecting piece, so that the assembly and disassembly are convenient, and repair and maintenance are convenient.

Description

Technical field:

[0001] The utility model relates to the technical field related to drive axles, and more specifically to an improved wet parking and driving integrated brake structure. Background technology:

[0002] With the development of the domestic forklift industry, the design and manufacture of wet drive axles have gradually matured. As one of the main drive systems of forklifts, drive axles are used in various types of forklifts.

[0003] In the existing drive axle, a brake structure is installed at the connection between the half shaft and the bridge shaft, such as Figure 1 As shown, a spline sleeve 1a is installed on its half shaft through spline cooperation, and a plurality of spacers and friction plates are inserted on the spline sleeve 1a. At the same time, a parking brake piston 2a and a service brake piston 3a are installed in the right end of the bridge shaft, and a bearing seat flange 4a is fixed at the right end. The parking brake piston 2a and the service brake piston 3a are arranged to abut against each other on the left and right, so that the distance between the two is too large, which increases the total length of the parking brake piston 2a and the service brake piston 3a, and also increases the length of the right part of the bridge shaft of the drive bridge, increasing the space occupied. At the same time, the parking brake piston 2a and the service brake piston 3a are in the bridge shaft, so that when disassembling and assembling, the bearing seat flange 4a needs to be removed before the parking brake piston 2a and the service brake piston 3a can be removed, and the disassembly and installation are troublesome. Utility model content:

[0004] The purpose of the utility model is to overcome the deficiencies of the prior art and to provide an improved wet parking and driving integrated brake structure. Its service brake piston block and parking brake piston block are arranged with a sleeve, so that the total length of the two is greatly shortened, the length of the bridge shaft connecting piece can be shortened, and the space occupancy can be reduced. At the same time, the service brake flange and parking brake flange installed on the service brake piston block and parking brake piston block can be installed on the bridge shaft connecting piece as a module, so that it is easy to disassemble and assemble and convenient to repair and maintain.

[0005] The solution of the utility model to solve the technical problem is:

[0006] An improved wet parking and driving integrated brake structure, comprising a bridge shaft connecting member, wherein a middle through hole extending to the right is formed in the middle of the left end of the bridge shaft connecting member, a stepped hole section is formed in the middle of the right end face of the bridge shaft connecting member, a half shaft is inserted and sleeved in the middle through hole and the stepped hole section, a spline transition sleeve is installed at the half shaft at the stepped hole section, a plurality of friction plates and a plurality of spacers are inserted and sleeved on the spline transition sleeve, all friction plates and spacers are arranged at intervals, the leftmost end is a spacer, the rightmost end is a friction plate, the left end face of the leftmost spacer is pressed against the left end face of the large diameter hole section of the stepped hole section, an annular spacer is inserted and sleeved at the right end of the large diameter hole section of the stepped hole section, the left end of the annular spacer is pressed against the right end face of the friction plate at the rightmost end, and the annular spacer is inserted and sleeved on the half shaft;

[0007] A parking brake flange is fixed on the right end surface of the bridge shaft connecting member, a middle portion of the parking brake flange is formed with a middle stepped through hole with a small diameter hole section on the left and a large diameter hole section on the right, a stepped parking brake piston block is inserted into the middle stepped through hole, the parking brake piston block is matched with the middle stepped through hole, and the left end of the parking brake piston block faces the right end surface of the annular partition;

[0008] A service brake flange is fixed on the right end surface of the parking brake flange, a left extension portion extending to the left is formed in the middle of the left end surface of the service brake flange, the left extension portion is inserted into a circular recessed hole formed in the middle of the right end surface of the parking brake piston block, a mounting hole extending to the right is formed in the middle of the left end surface of the left extension portion, a service brake piston block is inserted into the mounting hole, the left end of the service brake piston block extends out of the left end of the mounting hole and is located in a middle through hole extending to the left formed in the middle of the left end surface of the circular recessed hole and faces the right end surface of the annular partition.

[0009] An external spline protrusion is formed on the outer side wall of the half shaft at the stepped hole section, and the external spline protrusion is inserted into and matched with a spline groove formed on the inner side wall of the spline transition sleeve.

[0010] The outer wall surface of the partition is in close contact with or close to the inner wall of the large diameter hole section of the stepped hole section.

[0011] An annular groove is formed on the inner wall of the right end of the large-diameter hole section of the stepped hole section, and a circular protrusion extending to the left is formed in the middle of the left end surface of the parking brake flange, which is inserted into the annular groove, and the left end surface edge of the parking brake flange is pressed against the right end surface edge of the bridge shaft connecting member and fixedly connected by bolts, and an annular sealing ring is clamped between the left end surface edge of the parking brake flange and the right end surface edge of the bridge shaft connecting member, and the left end of the middle stepped through hole extends out of the left end surface of the circular protrusion.

[0012] The parking brake piston block comprises a right end large diameter block portion, a small diameter block portion extending to the left is formed in the middle of the left end surface of the right end large diameter block portion, the right end large diameter block portion is inserted into the right hole section of the middle stepped through hole, the outer side wall of the right end large diameter block portion is tightly against the inner side wall of the right hole section of the middle stepped through hole, a sealing ring is nested in the annular groove formed on the inner side wall of the right hole section of the middle stepped through hole, the inner side wall of the sealing ring is pressed against the outer side wall of the right end large diameter block portion, and the small diameter block portion is inserted into the right hole section of the middle stepped through hole. The diameter block part is inserted into the left hole section of the middle stepped through hole, the outer side wall of the small diameter block part is close to the inner side wall of the left hole section of the middle stepped through hole, the inner side wall of the sealing ring nested in the ring on the inner side wall of the left hole section is pressed against the outer side wall of the small diameter block part, and an annular cavity is formed between the left end face of the large diameter block part at the right end and the left end face of the right hole section, and a parking brake unlocking oil inlet through hole is formed on the inner side wall of the annular cavity, which extends radially outward and protrudes out of the outer side wall of the parking brake flange.

[0013] An annular protrusion is formed on the right end face around the right hole section of the parking brake flange, and a sealing ring is nested in the annular sealing groove formed on the right end face of the parking brake flange at the outer side of the annular protrusion, an annular groove is formed in the middle of the left end face of the service brake flange, the annular protrusion is inserted into the annular groove, the outer side wall of the annular protrusion is tightly against the inner side wall of the annular groove, and the left end face edge of the service brake flange is pressed against the right end face edge of the parking brake flange and against the corresponding sealing ring.

[0014] The outer side of the left extension portion is sleeved with a spring seat, the right end face of the spring seat is pressed against the left end face of the service brake flange and is fixedly connected to the service brake flange by bolts, a plurality of left and right through holes are formed on the spring seat, a plurality of parking brake springs are sleeved in the corresponding through holes, the right end of the parking brake spring is pressed against the left end face of the service brake flange, and the left end of the parking brake spring is pressed against the left end face of the circular concave hole of the parking brake piston block.

[0015] The mounting hole is a stepped hole, the left end hole section of which is a large diameter hole section, and the right end hole section is a small diameter hole section. A central through hole extending to the right is formed in the middle of the right end surface of the mounting hole, and the right end of the half shaft extends out of the right end of the central through hole;

[0016] The service brake piston block is a stepped piston block, the right part of which is a small diameter part and the left part is a large diameter part, which cooperates with the mounting hole, the outer wall of the right part is tightly against the inner wall of the right end hole section of the mounting hole, a sealing ring is sandwiched between the outer wall of the right part and the inner wall of the right end hole section of the mounting hole, the outer wall of the left part is tightly against the inner wall of the left end hole section of the mounting hole, a sealing ring is sandwiched between the outer wall of the left part and the inner wall of the left end hole section of the mounting hole, a service brake oil inlet hole is formed on the outer wall of the service brake flange, the inner end of which is communicated with the right end of the inner wall of the left end hole section of the mounting hole, a first annular cavity is formed between the right end surface of the left part of the service brake piston block and the right side wall of the left end hole section of the mounting hole, and the inner end of the service brake oil inlet hole is communicated with the first annular cavity;

[0017] The left end of the service brake piston block extends out of the mounting hole.

[0018] A radially extending push portion is formed on the outer side wall of the left end of the service brake piston block, and the right end surface of the radially extending push portion is close to the left end surface of the left extending portion;

[0019] A driving step through hole is formed in the middle of the driving brake piston block, and the half shaft is inserted into the driving step through hole. The left end of the driving step through hole is a large diameter hole section, and the right end is a small diameter hole section. A plurality of limit step through holes and a plurality of installation limit through holes are formed on the right end face of the large diameter hole section of the driving step through hole. All the limit step through holes and the installation limit through holes are arranged at intervals. The limit spring is inserted into the left large diameter hole section of the corresponding limit step through hole, and the screw portion of the limit bolt is inserted into the limit spring. The rotating portion of the limit bolt is pressed against the left end face of the limit spring. The right end face of the spring is pressed against the right end face of the left large-diameter hole section of the corresponding limiting stepped through hole, the right end of the screw portion of the limiting bolt extends out of the right small-diameter hole section of the corresponding limiting stepped through hole and is screwed on the right end face of the mounting hole, a positioning sleeve is clamped in the mounting limiting through hole, the screw portion of the fixing bolt is inserted into the positioning sleeve, the right end of the screw portion of the fixing bolt extends out of the right end of the positioning sleeve and is screwed on the right end face of the mounting hole, the right end face of the rotating portion of the fixing bolt is close to the left end face of the positioning sleeve, and the outer side wall of the positioning sleeve is close to the inner side wall of the corresponding mounting limiting through hole.

[0020] The outstanding effects of the utility model are:

[0021] Its service brake piston block and parking brake piston block are arranged with a sleeve, so that the total length of the two is greatly shortened, the length of the bridge shaft connecting part can be shortened, and the space occupancy can be reduced. At the same time, the service brake flange and parking brake flange installed on the service brake piston block and parking brake piston block can be installed on the bridge shaft connecting part as a module, making it easy to disassemble and assemble and convenient for repair and maintenance. Description of the drawings:

[0022] Figure 1 It is a schematic diagram of the existing parking brake structure;

[0023] Figure 2 It is a partial structural schematic diagram of the utility model;

[0024] Figure 3 yes Figure 2 A partial enlarged view of

[0025] Figure 4 yes Figure 2 A partial enlarged view of another part. Specific implementation method:

[0026] For example, see Figures 2 to 4 As shown, an improved wet parking and driving integrated brake structure includes a bridge shaft connecting member 10, wherein a middle through hole 11 extending to the right is formed in the middle of the left end of the bridge shaft connecting member 10, and a bridge shaft is fixed in the left part of the middle through hole 11, and at the same time, a positioning hole is formed on the outer side wall of the bridge shaft, which is aligned with the pin shaft positioning through hole formed on the inner side wall of the left part of the middle through hole 11, and the pin shaft is clamped in the corresponding positioning hole and the pin shaft positioning through hole to achieve position limiting;

[0027] A stepped hole section 12 is formed in the middle of the right end face of the bridge shaft connecting member 10, the left end hole section of which is a small diameter hole section and the right end is a large diameter hole section. The left end of the small diameter hole section of the stepped hole section 12 is connected to the middle through hole 11. The half shaft 20 is inserted into the central through hole of the bridge shaft and the stepped hole section 12. A spline transition sleeve 21 is installed at the half shaft 20 at the stepped hole section 12. An external spline protrusion is formed on the outer side wall of the half shaft 20 at the stepped hole section 12. The external spline protrusion is inserted into and matched with the spline groove formed on the inner side wall of the spline transition sleeve 21.

[0028] A spline groove (or a tooth-shaped groove) is formed on the outer side of the spline transition sleeve 21, and a plurality of friction plates 22 and a plurality of spacers 23 are inserted into the spline transition sleeve 21. A spline protrusion (or a tooth-shaped portion) is formed on the inner side wall of the middle through hole of the friction plate 22, which is inserted into the corresponding spline groove (or the tooth-shaped portion is inserted into the tooth-shaped groove) and cooperates with each other; the outer wall surface of the spacer 23 is close to or close to the inner side wall of the large diameter hole section of the stepped hole section 12.

[0029] All friction plates 22 and spacers 23 are arranged at intervals (i.e., one friction plate 22 is provided between every two spacers 23, and the arrangement is sequentially arranged in this manner), the leftmost end of which is the spacer 23, and the rightmost end of which is the friction plate 22, the left end face of the leftmost spacer 23 is pressed against the left end face of the large diameter hole section of the stepped hole section 12, and an annular spacer 24 is inserted at the right end of the large diameter hole section of the stepped hole section 12, the left end of the annular spacer 24 is pressed against the right end face of the rightmost friction plate 22, and the annular spacer 24 is inserted on the half shaft 20;

[0030] All the spacers 23 have aligned positioning holes formed on their edges, and the annular spacer 24 also has aligned positioning holes formed on its edges. A positioning pin is clamped on the edge of the left end face of the large diameter hole section of the stepped hole section 12, and the positioning pin is inserted into the corresponding positioning holes of the spacers 23 and the annular spacer 24. Among them, an annular groove is formed on the outer wall of the spline transition sleeve 21, and the shaft elastic retaining ring is clamped in the annular groove, which is inserted into the middle hole of the corresponding spacer 23 and between two adjacent friction plates 22 to prevent the spline transition sleeve 21 from moving too much along the axial direction of the half shaft 20.

[0031] The right end surface of the bridge shaft connecting member 10 is fixedly connected with a parking brake flange 30 by bolts, and a middle portion of the parking brake flange 30 is formed with a middle stepped through hole 31 with a small diameter hole section on the left and a large diameter hole section on the right. A stepped parking brake piston block 40 is inserted into the middle stepped through hole 31, and the parking brake piston block 40 is matched with the middle stepped through hole 31, and the left end of the parking brake piston block 40 faces the right end surface of the annular partition 24;

[0032] A service brake flange 50 is fixedly connected to the right end surface of the parking brake flange 30 by bolts, and a left extension portion 51 extending to the left is formed in the middle of the left end surface of the service brake flange 50, and the left extension portion 51 is inserted into a circular recessed hole 41 formed in the middle of the right end surface of the parking brake piston block 40, and a mounting hole 52 extending to the right is formed in the middle of the left end surface of the left extension portion 51, and a service brake piston block 60 is inserted in the mounting hole 52, and the left end of the service brake piston block 60 extends out of the left end of the mounting hole 52 and is located in the middle through hole extending to the left formed in the middle of the left end surface of the circular recessed hole 41 and facing the right end surface of the annular partition 24.

[0033] Furthermore, an annular groove is formed on the inner wall of the right end of the large diameter hole section of the stepped hole section 12, and a circular protrusion 32 extending to the left is formed in the middle of the left end face of the parking brake flange 30, which is inserted into the annular groove, and the outer wall of the circular protrusion 32 is close to the inner wall of the annular groove. The left end face edge of the parking brake flange 30 is pressed against the right end face edge of the bridge shaft connector 10 and fixedly connected by bolts, and an annular sealing ring is clamped between the left end face edge of the parking brake flange 30 and the right end face edge of the bridge shaft connector 10, and the left end of the middle stepped through hole 31 extends out of the left end face of the circular protrusion 32.

[0034] Furthermore, the parking brake piston block 40 includes a large-diameter block portion at the right end, a small-diameter block portion extending to the left is formed in the middle of the left end surface of the large-diameter block portion at the right end, the large-diameter block portion at the right end is inserted into the right hole section of the middle stepped through hole 31, the outer wall of the large-diameter block portion at the right end is tightly against the inner wall of the right hole section of the middle stepped through hole 31, a sealing ring is nested in the annular groove formed on the inner wall of the right hole section of the middle stepped through hole 31, the inner wall of the sealing ring is pressed against the outer wall of the large-diameter block portion at the right end, and the small-diameter block portion is inserted into the middle step. In the left hole section of the stepped through hole 31, the outer side wall of the small diameter block is in close contact with the inner side wall of the left hole section of the middle stepped through hole 31, and the inner side wall of the sealing ring nested in the ring on the inner side wall of the left hole section is pressed against the outer side wall of the small diameter block. An annular cavity is formed between the left end face of the large diameter block at the right end and the left end face of the right hole section, and a parking brake unlocking oil inlet through hole 35 is formed on the inner side wall of the annular cavity, which extends radially outward and protrudes out of the outer side wall of the parking brake flange 30, and the annular cavity is located between the two sealing rings of the middle stepped through hole 31.

[0035] Furthermore, an annular protrusion is formed on the right end face around the right hole section of the parking brake flange 30, and a sealing ring is nested in the annular sealing groove formed on the right end face of the parking brake flange 30 at the outer side of the annular protrusion. An annular groove is formed in the middle of the left end face of the service brake flange 50, and the annular protrusion is inserted into the annular groove. The outer wall of the annular protrusion is tightly against the inner wall of the annular groove, and the left end face edge of the service brake flange 50 is pressed against the right end face edge of the parking brake flange 30 and against the corresponding sealing ring.

[0036] Furthermore, a spring seat 53 is inserted into the outer side of the left extension portion 51, the right end face of the spring seat 53 is pressed against the left end face of the service brake flange 50 and is fixedly connected to the service brake flange 50 by bolts, and a plurality of left and right through holes are formed on the spring seat 53 (which are evenly distributed on the spring seat 53 with the central axis of the spring seat 53 as the center), and a plurality of parking brake springs 54 are inserted into the corresponding through holes, the right end of the parking brake spring 54 is pressed against the left end face of the service brake flange 50, and the left end of the parking brake spring 54 is pressed against the left end face of the circular recessed hole 41 of the parking brake piston block 40.

[0037] Furthermore, the mounting hole 52 is a stepped hole, the left end hole section of which is a large diameter hole section, and the right end hole section is a small diameter hole section. A central through hole extending to the right is formed in the middle of the right end surface of the mounting hole 52, and the right end of the half shaft 20 extends out of the right end of the central through hole;

[0038] The service brake piston block 60 is a stepped piston block, the right part of which is a small diameter part and the left part is a large diameter part, which cooperates with the mounting hole 52, the outer wall of the right part is in close contact with the inner wall of the right end hole section of the mounting hole 52, a sealing ring is sandwiched between the outer wall of the right part and the inner wall of the right end hole section of the mounting hole 52, the outer wall of the left part is in close contact with the inner wall of the left end hole section of the mounting hole 52, a sealing ring is sandwiched between the outer wall of the left part and the inner wall of the left end hole section of the mounting hole 52, a service brake oil inlet hole 55 is formed on the outer wall of the service brake flange 50, the inner end of which is communicated with the right end of the inner wall of the left end hole section of the mounting hole 52, a first annular cavity is formed between the right end surface of the left part of the service brake piston block 60 and the right side wall of the left end hole section of the mounting hole 52, and the inner end of the service brake oil inlet hole 55 is communicated with the first annular cavity (the first annular cavity is located between the two sealing rings of the mounting hole 52);

[0039] The left end of the service brake piston block 60 extends out of the mounting hole 52, and a radially extending push portion 61 is formed on the outer side wall of the left end of the service brake piston block 60, and the right end surface of the radially extending push portion 61 is close to the left end surface of the left extension portion 51;

[0040] A driving step through hole 62 is formed in the middle of the driving brake piston block 60, and the half shaft 20 is inserted into the driving step through hole 62. The left end of the driving step through hole 62 is a large diameter hole section, and the right end is a small diameter hole section. A plurality of limit step through holes and a plurality of installation limit through holes are formed on the right end face of the large diameter hole section of the driving step through hole 62. All the limit step through holes and the installation limit through holes are arranged at intervals and are evenly distributed on the right end face of the large diameter hole section of the driving step through hole 62 with the central axis of the driving step through hole 62 as the center. The limit spring 63 is inserted into the left large diameter hole section of the corresponding limit step through hole, and the screw portion of the limit bolt 64 is inserted into the limit spring 63. The rotation of the limit bolt 64 The movable part is pressed against the left end face of the limit spring 63, and the right end face of the limit spring 63 is pressed against the right end face of the left large-diameter hole section of the corresponding limit stepped through hole. The right end of the screw part of the limit bolt 64 extends out of the right small-diameter hole section of the corresponding limit stepped through hole and is screwed on the right end face of the mounting hole 52. A positioning sleeve 65 is clamped in the mounting limit through hole, and the screw part of the fixing bolt 66 is inserted into the positioning sleeve 65. The right end of the screw part of the fixing bolt 66 extends out of the right end of the positioning sleeve 65 and is screwed on the right end face of the mounting hole 52. The right end face of the rotating part of the fixing bolt 66 is close to the left end face of the positioning sleeve 65, and the outer side wall of the positioning sleeve 65 is close to the inner side wall of the corresponding mounting limit through hole.

[0041] When the present embodiment is in use, during normal driving, the parking brake unlocking oil inlet through hole 35 is filled with oil, so that the right end surface of the parking brake piston block 40 is closely attached to the left end surface of the service brake flange 50, and at the same time, all the parking brake springs 54 are compressed;

[0042] When service braking is needed, oil flows into the service brake oil inlet hole 55, causing the service brake piston block 60 to move to the left. The corresponding limit spring 63 is stretched, and the left end face of the radially extending push portion 61 of the service brake piston block 60 is pressed against the right end face of the annular partition 24, causing the annular partition 24 to move to the left, pressing all the friction plates 22 and partitions 23 against each other to achieve braking.

[0043] When parking, the service brake oil inlet hole 55 and the parking brake unlocking oil inlet hole 35 are not pressurized and oil passes through them. The parking brake spring 54 is gradually elastically reset to move the parking brake piston block 40 to the left, and the left end face of the parking brake piston block 40 is pressed against the right end face of the annular partition 24, so that the annular partition 24 moves to the left, pressing all the friction plates 22 and the partitions 23 against each other to achieve braking. The limit spring 63 elastically returns to move the service brake piston block 60 to the right, so that its right end is pressed against the right end face of the mounting hole 52 and no longer presses against the annular partition 24.

[0044] When this embodiment is in use, the distance between the right end face of the rotating part of the fixing bolt 66 and the left end face of the positioning sleeve 65 is changed by rotating the fixing bolt 66, thereby limiting the distance that the service brake piston block 60 moves to the left, meeting the braking needs and preventing excessive movement to the left.

Claims

1. An improved wet parking and driving integrated brake structure, comprising an axle connecting member (10), characterized in that: The middle portion of the left end of the bridge shaft connecting member (10) is formed with a middle through hole (11) extending to the right, and the middle portion of the right end face of the bridge shaft connecting member (10) is formed with a stepped hole section (12) extending to the left, the left end hole section being a small diameter hole section, and the right end being a large diameter hole section, the left end of the small diameter hole section of the stepped hole section (12) is communicated with the middle through hole (11), the half shaft (20) is inserted into the middle through hole (11) and the stepped hole section (12), a spline transition sleeve (21) is installed at the half shaft (20) at the stepped hole section (12), a spline groove is formed on the outer side of the spline transition sleeve (21), a plurality of friction plates (22) and a plurality of spacers (23) are inserted into On the spline transition sleeve (21), a spline protrusion is formed on the inner side wall of the middle through hole of the friction plate (22), which is inserted into the corresponding spline groove and matched, and all friction plates (22) and spacers (23) are arranged at intervals, the leftmost end is the spacer (23), and the rightmost end is the friction plate (22), the left end face of the leftmost spacer (23) is pressed against the left end face of the large diameter hole section of the stepped hole section (12), and an annular spacer (24) is inserted at the right end of the large diameter hole section of the stepped hole section (12), the left end of the annular spacer (24) is pressed against the right end face of the friction plate (22) at the rightmost end, and the annular spacer (24) is inserted on the half shaft (20); A parking brake flange (30) is fixed on the right end surface of the bridge shaft connecting member (10), a middle portion of the parking brake flange (30) is formed with a middle stepped through hole (31) with a left hole section being a small diameter hole section and a right hole section being a large diameter hole section, a stepped parking brake piston block (40) is inserted into the middle stepped through hole (31), the parking brake piston block (40) is matched with the middle stepped through hole (31), and the left end of the parking brake piston block (40) faces the right end surface of the annular partition (24); A service brake flange (50) is fixed on the right end surface of the parking brake flange (30), a left extension portion (51) extending to the left is formed in the middle of the left end surface of the service brake flange (50), the left extension portion (51) is inserted into a circular concave hole (41) formed in the middle of the right end surface of the parking brake piston block (40), a mounting hole (52) extending to the right is formed in the middle of the left end surface of the left extension portion (51), a service brake piston block (60) is inserted into the mounting hole (52), the left end of the service brake piston block (60) extends out of the left end of the mounting hole (52) and is located in a middle through hole extending to the left formed in the middle of the left end surface of the circular concave hole (41) and facing the right end surface of the annular partition (24).

2. The improved wet parking and driving integrated brake structure according to claim 1, characterized in that: An external spline protrusion is formed on the outer side wall of the half shaft (20) at the stepped hole section (12), and the external spline protrusion is inserted into and matched with a spline groove formed on the inner side wall of the spline transition sleeve (21).

3. The improved wet parking and driving integrated brake structure according to claim 1, characterized in that: The left end surface edge of the parking brake flange (30) is pressed against the right end surface edge of the bridge shaft connecting member (10) and is fixedly connected by bolts.

4. The improved wet parking and driving integrated brake structure according to claim 1, characterized in that: The parking brake piston block (40) comprises a right end large diameter block portion, a small diameter block portion extending to the left is formed in the middle of the left end surface of the right end large diameter block portion, the right end large diameter block portion is inserted into the right hole section of the middle stepped through hole (31), the outer wall of the right end large diameter block portion is in close contact with the inner wall of the right hole section of the middle stepped through hole (31), the small diameter block portion is inserted into the left hole section of the middle stepped through hole (31), the outer wall of the small diameter block portion is in close contact with the inner wall of the left hole section of the middle stepped through hole (31), an annular cavity is formed between the left end surface of the right end large diameter block portion and the left end surface of the right hole section, and a parking brake unlocking oil inlet through hole (35) is formed on the inner wall of the annular cavity, which radially extends outward and protrudes out of the outer wall of the parking brake flange (30).

5. The improved wet parking and driving integrated brake structure according to claim 1, characterized in that: An annular protrusion is formed on the right end face around the right hole section of the parking brake flange (30), and a sealing ring is nested in an annular sealing groove formed on the right end face of the parking brake flange (30) outside the annular protrusion. An annular groove is formed in the middle of the left end face of the service brake flange (50), and the annular protrusion is inserted into the annular groove. The outer wall of the annular protrusion is tightly attached to the inner wall of the annular groove. The left end face edge of the service brake flange (50) is pressed against the right end face edge of the parking brake flange (30) and against the corresponding sealing ring.

6. The improved wet parking and driving integrated brake structure according to claim 1, characterized in that: A spring seat (53) is inserted and sleeved on the outer side of the left extension portion (51); the right end face of the spring seat (53) is pressed against the left end face of the service brake flange (50) and is fixedly connected to the service brake flange (50) by bolts; a plurality of left and right through holes are formed on the spring seat (53); a plurality of parking brake springs (54) are inserted and sleeved in the corresponding through holes; the right end of the parking brake spring (54) is pressed against the left end face of the service brake flange (50); and the left end of the parking brake spring (54) is pressed against the left end face of the circular concave hole (41) of the parking brake piston block (40).

7. The improved wet parking and driving integrated brake structure according to claim 1, characterized in that: The mounting hole (52) is a stepped hole, the left end hole section of which is a large diameter hole section, and the right end hole section is a small diameter hole section, and a central through hole extending to the right is formed in the middle of the right end surface of the mounting hole (52); The service brake piston block (60) is a stepped piston block, the right part of which is a small diameter part and the left part is a large diameter part, which matches with the mounting hole (52), the outer wall of the right part is in close contact with the inner wall of the right end hole section of the mounting hole (52), a sealing ring is sandwiched between the outer wall of the right part and the inner wall of the right end hole section of the mounting hole (52), the outer wall of the left part is in close contact with the inner wall of the left end hole section of the mounting hole (52), and the outer wall of the left part is in close contact with the inner wall of the left end hole section of the mounting hole (52). A sealing ring is sandwiched between the inner side walls of the left end hole section of the mounting hole (52); a service brake oil inlet hole (55) is formed on the outer side wall of the service brake flange (50), and its inner end is communicated with the right end of the inner side wall of the left end hole section of the mounting hole (52); a first annular cavity is formed between the right end surface of the left part of the service brake piston block (60) and the right side wall of the left end hole section of the mounting hole (52), and the inner end of the service brake oil inlet hole (55) is communicated with the first annular cavity.

8. The improved wet parking and driving integrated brake structure according to claim 7, characterized in that: A radially extending push portion (61) is formed on the outer side wall of the left end of the service brake piston block (60), and the right end surface of the radially extending push portion (61) is close to the left end surface of the left extension portion (51); A driving step through hole (62) is formed in the middle of the driving brake piston block (60), the half shaft (20) is inserted into the driving step through hole (62), a plurality of limit step through holes are formed on the right end face of the large diameter hole section of the driving step through hole (62), a limit spring (63) is inserted into the left large diameter hole section of the corresponding limit step through hole, a screw portion of a limit bolt (64) is inserted into the limit spring (63), a rotating portion of the limit bolt (64) is pressed against the left end face of the limit spring (63), a right end face of the limit spring (63) is pressed against the right end face of the left large diameter hole section of the corresponding limit step through hole, and the right end of the screw portion of the limit bolt (64) extends out of the right small diameter hole section of the corresponding limit step through hole and is screwed to the right end face of the mounting hole (52).

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