Wet brake for drive axle of wheel excavator

Abstract

The utility model discloses a wet brake of a wheel excavator drive axle. Comprising a supporting seat, a parking braking piston, a service braking piston and a belleville spring, wherein the supporting seat is positioned on a shell and coaxially arranged outside a half shaft in a sleeving manner; the parking braking piston and one side of the supporting seat define a parking braking oil cavity; the service braking piston and the other side of the supporting seat define a service braking oil cavity; the gear sleeve is sleeved on the half shaft in a spline fit mode, the friction plate set is assembled between the gear sleeve and the shell in a spline fit mode, the friction plate set is clamped between the service braking piston and a connecting disc fixed with the outer shell, a pin shaft arranged in the axial direction is fixed on the parking braking piston, and the pin shaft penetrates through a supporting seat in a guide fit mode to abut against the service braking piston. An adjusting bolt parallel to the pin shaft is screwed into the traveling brake piston, and a reset spring which is compressed when the traveling brake piston compresses the friction plate set is arranged on the adjusting bolt in a sleeved mode. The wet brake prevents the friction plate group from slipping, abrading and ablating, improves the reliability of the wet brake, and prolongs the service life of the wet brake.

Description

TECHNICAL FIELD

[0001] The utility model relates to a wet brake of driving axle of wheel excavator belongs to wet brake technical field. BACKGROUND

[0002] The wheel excavator brake is hydraulic wet brake, including parking brake and running brake, the parking brake piston one side sets butterfly spring, the running brake piston one side sets friction plate group, the parking brake piston and running brake piston abut each other and share a support seat, and respectively form parking brake oil cavity and running brake oil cavity, according to work demand, realize different brake function.Parking brake and running brake oil cavity are closed when parking brake, and the parking brake piston, running brake piston and friction plate group are pressed in turn by the push of disc spring, and the friction plate group forms brake to the tooth cover on the axle half, when releasing parking brake, the parking brake oil cavity is given oil, and the push of disc spring is eliminated to release the compression of friction plate group and release brake, and the vehicle can normally run, and the parking brake oil cavity is closed when the vehicle normally runs, and the oil pressure of parking brake oil cavity will form an axial force to running brake piston, and the compression of reset spring for the reset of running brake piston piston is generated, and the reset spring is insufficient in elasticity and cannot reset running brake piston in time due to long-term stress, so that running brake piston is pushed to friction plate group, and the friction plate group is in half brake state for a long time, resulting in friction plate sliding abrasion and ablation, and the brake reliability is reduced, and the brake life is shortened. CONTENT OF THE UTILITY MODEL

[0003] The wet brake of driving axle of wheel excavator provided by the utility model prevents running brake piston from pressing to friction plate group in running process, avoids friction plate group in half brake state in running process, reduces the abrasion of friction plate group, prevents friction plate group from sliding abrasion and ablation, prolongs the fatigue life of reset spring, improves the reliability of running brake, improves the reliability of wet brake, and prolongs the service life.

[0004] To achieve the above object, the utility model adopts the technical scheme that:

[0005] The wet brake of the wheel excavator drive axle is arranged in the housing of the drive axle and cooperates with the half axle of the drive axle, and comprises a supporting seat coaxially sleeved with the half axle and positioned on the housing, a parking brake piston cooperatively enclosing a parking brake oil cavity with one side of the supporting seat, a service brake piston cooperatively enclosing a service brake oil cavity with the other side of the supporting seat, a butterfly spring assembled on the supporting seat and abutting against the parking brake piston, a tooth sleeve in spline cooperation with the half axle, and a friction plate set in spline cooperation and assembled between the tooth sleeve and the housing, the friction plate set being clamped between the service brake piston and a connecting disc fixed with the housing, characterized in that: an axially arranged pin shaft is fixed on the parking brake piston, the pin shaft is guided and cooperatively arranged through the supporting seat and abuts against the service brake piston, an adjusting bolt parallel to the pin shaft is screwed into the service brake piston, and a reset spring compressed with the service brake piston pressing the friction plate set is sleeved on the adjusting bolt.

[0006] Preferably, a piston through hole with a sunk face is formed on the parking brake piston, a threaded blind hole coaxially aligned with the piston through hole is formed on the pin shaft, a connecting screw is screwed through the piston through hole and fixed in the threaded blind hole to fix one end of the pin shaft on the parking brake piston, and a sealing washer pressed by the head of the connecting screw is arranged on the sunk face of the piston through hole.

[0007] Preferably, a supporting seat through hole in guiding cooperation with the pin shaft is formed on the supporting seat, the supporting seat through hole is communicated with the parking brake oil cavity, the pin shaft passes through the parking brake oil cavity and the supporting seat through hole and abuts against the service brake piston, and a sealing ring tightly abutting against the inner wall of the supporting seat through hole is buckled on the pin shaft.

[0008] Preferably, a locking nut is threadedly sleeved on the supporting seat, the locking nut abuts against the parking brake piston, and the butterfly spring is axially pressed on the outer end face of the parking brake piston by the locking nut.

[0009] Preferably, a through hole for the adjusting bolt to pass through is formed on the supporting seat, one end of the reset spring abuts against the head of the adjusting bolt, and the other end abuts against the supporting seat.

[0010] Preferably, the friction plate set comprises a steel sheet in spline cooperation with the housing and a friction plate in spline cooperation with the tooth sleeve, the steel sheet and the friction plate are alternately and laminated arranged, the innermost steel sheet abuts against the service brake piston, and the outermost steel sheet abuts against the connecting disc.

[0011] The wheel excavator drive axle wet brake has the following beneficial effects:

[0012] The utility model discloses a wet brake of wheel excavator drive axle, and the parking brake piston and the one side of support seat form the parking brake oil cavity, and the service brake piston and the other side of support seat form the service brake oil cavity, and the parking brake piston is fixed pin shaft, and pin shaft direction cooperation passes through support seat and is opposite with service brake piston, and injects pressure oil to parking brake oil cavity under the initial state, and makes the pressure in parking brake oil cavity 15~30bar, and when parking brake, parking brake oil cavity and service brake oil cavity are all closed, and through the elastic force of butterfly spring, parking brake piston, pin shaft, service brake piston and friction piece group are pressed in turn, and the brake of tooth cover is formed, and at this moment, reset spring is compressed, and when service, the oil of parking brake oil cavity is passed to make the pressure in parking brake oil cavity increase and push parking brake piston and compress butterfly spring, and eliminate the thrust of butterfly spring, and reset spring drives parking brake piston and releases the compression of friction piece group, and brake is released, and the vehicle can normally travel, and when parking brake, the oil of service brake oil cavity is passed and pushes service brake piston and compresses friction piece group and forms the brake of tooth cover, and pin shaft is clamped between parking brake piston and service brake piston, and pin shaft is fixed with parking brake piston, avoid the pressure in parking brake oil cavity when the vehicle travels and is transmitted to service brake piston through pin shaft, make service brake piston not bear axial thrust in the process of service, prevent service brake piston from pressing friction piece group in the process of service, avoid friction piece group in the process of service in half brake state, reduce the abrasion of friction piece group, prevent friction piece group from sliding abrasion and ablation, prevent reset spring from being compressed in the process of service, prolong the fatigue life of reset spring, and the movement of service brake piston is guided with the direction cooperation of pin shaft and support seat, improve the reliability of service brake, improve the reliability of wet brake, and prolong its service life. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is the schematic diagram of the utility model's wheel excavator drive axle wet brake. DETAILED DESCRIPTION

[0014] The embodiment of the utility model is explained in detail below. Figure 1 The embodiment of the utility model is explained in detail below.

[0015] The wet brake of the wheel excavator drive axle is arranged in the housing (1) of the drive axle and cooperates with the half axle (2) of the drive axle, and comprises a supporting seat (3) arranged coaxially on the housing (1) and sleeved on the outside of the half axle (2), a parking brake piston (4) enclosed with one side of the supporting seat (3) to form a parking brake oil cavity (A), a driving brake piston (5) enclosed with the other side of the supporting seat (3) to form a driving brake oil cavity (B), a butterfly spring (6) arranged on the supporting seat (3) and abutting against the parking brake piston (4), a tooth sleeve (7) sleeved on the half axle (2) in the form of spline, a friction plate set (8) arranged between the tooth sleeve (7) and the housing (1) in the form of spline, and the friction plate set (8) is clamped between the driving brake piston (5) and a connecting disc (9) fixed on the housing (1), characterized in that the parking brake piston (4) is fixed with a pin shaft (10) arranged in the axial direction, the pin shaft (10) is guided and matched to pass through the supporting seat (3) and abut against the driving brake piston (5), the driving brake piston (5) is screwed with an adjusting bolt (11) parallel to the pin shaft (10), and the adjusting bolt (11) is sleeved with a return spring (12) compressed when the driving brake piston (5) compresses the friction plate set (8).

[0016] The wet brake of the wheel excavator drive axle is arranged in the housing (1) of the drive axle and cooperates with the half axle (2) of the drive axle, and comprises a supporting seat (3) arranged coaxially on the housing (1) and sleeved on the outside of the half axle (2), a parking brake piston (4) enclosed with one side of the supporting seat (3) to form a parking brake oil cavity (A), a driving brake piston (5) enclosed with the other side of the supporting seat (3) to form a driving brake oil cavity (B), a butterfly spring (6) arranged on the supporting seat (3) and abutting against the parking brake piston (4), a tooth sleeve (7) sleeved on the half axle (2) in the form of spline, a friction plate set (8) arranged between the tooth sleeve (7) and the housing (1) in the form of spline, and the friction plate set (8) is clamped between the driving brake piston (5) and a connecting disc (9) fixed on the housing (1), characterized in that the parking brake piston (4) is fixed with a pin shaft (10) arranged in the axial direction, the pin shaft (10) is guided and matched to pass through the supporting seat (3) and abut against the driving brake piston (5), the driving brake piston (5) is screwed with an adjusting bolt (11) parallel to the pin shaft (10), and the adjusting bolt (11) is sleeved with a return spring (12) compressed when the driving brake piston (5) compresses the friction plate set (8).

[0017] The piston through hole 41 with a sink surface is opened on the parking brake piston 4, a threaded blind hole coaxial with the piston through hole 41 is opened on the pin shaft 10, the connecting screw 13 is screwed in the threaded blind hole through the piston through hole 41 to fix the pin shaft 10 on the parking brake piston 4, and the sink surface of the piston through hole 4 is padded with a sealing washer pressed by the head of the connecting screw 13. The pin shaft is fixed at one end on the parking brake piston 4 through the connecting screw 13, and the sink surface of the piston through hole 4 is padded with a sealing washer, so as to avoid the oil in the parking brake oil cavity A from leaking outwards through the piston through hole 41, and the pin shaft 10 is fixed at one end on the parking brake piston 4 through the connecting screw 13, so as to avoid the transmission of the axial pressure of the pin shaft 10 to the service brake piston during the service process.

[0018] The support seat through hole 31 is opened on the support seat 3 for guiding and matching with the pin shaft 10, the support seat through hole 31 is communicated with the parking brake oil cavity A, the pin shaft 10 passes through the parking brake oil cavity A and the support seat through hole 31 and abuts against the service brake piston 5, and the pin shaft 10 is surrounded by a sealing ring tightly attached to the inner wall of the support seat through hole 31. The pin shaft 10 is fixed at one end on the parking brake piston 4, and the other end passes through the parking brake oil cavity A and the support seat through hole 31 and abuts against the service brake piston 5, so as to indirectly abut the parking brake piston 4 and the service brake piston 5 through the pin shaft 10, the sealing ring on the pin shaft 10 seals the pin shaft 10 and the support seat through hole 31, so as to prevent the oil in the parking brake oil cavity A from leaking through the support seat through hole 31 and ensure the reliability of the brake structure.

[0019] The locking nut 14 is threadedly matched with the support seat 3, the locking nut 14 abuts against the parking brake piston 4, and the butterfly spring 6 is axially pressed on the outer end surface of the parking brake piston 4 by the locking nut. The locking nut 14 is screwed on the support seat 3 and presses the butterfly spring 6 on the parking brake piston 4, the butterfly spring 6 is pressed in the initial state and has elasticity, so as to sequentially press the parking brake piston 4, the pin shaft 10, the service brake piston 5 and the friction plate group 8 and form the parking brake.

[0020] The through hole 32 is opened on the support seat 3 for the adjusting bolt to pass through, the reset spring 13 abuts against the head of the adjusting bolt 11 at one end and abuts against the support seat 3 at the other end. The adjusting bolt 11 passes through the through hole 32 and is screwed on the service brake piston 5, oil is passed to the service brake oil cavity B during the service brake, the service brake piston is pushed to press the friction plate group 8 to brake the toothed sleeve 7, the adjusting bolt 11 moves synchronously with the service brake piston 5 to compress the reset spring 12, when the service brake is needed to be released, the oil in the service brake oil cavity B is pumped out to reduce the internal pressure, the restoring force of the reset spring 12 drives the service brake piston 4 to reset reversely and loosen the pressing of the friction plate group 8.

[0021] The friction plate set 8 comprises steel sheets 81 which are in spline engagement with the housing 1 and friction plates 82 which are in spline engagement with the toothed sleeve 7, the steel sheets 81 and the friction plates 82 are arranged alternately in layers, the innermost steel sheet 81 abuts against the service brake piston 5, and the outermost steel sheet 81 abuts against the connecting disc 9. The steel sheets 81 cannot rotate due to the spline engagement with the housing 1, the friction plates 82 can rotate synchronously with the half shaft 2 due to the spline engagement with the toothed sleeve 7, when the friction plate set 8 is compressed, the steel sheets 81 and the friction plates 82 are compressed against each other, forming a brake for the toothed sleeve 7, when the compression of the friction plate set 8 is released, the steel sheets 81 and the friction plates 82 are disengaged, releasing the brake for the toothed sleeve 7.

[0022] The technical solutions of the embodiments of the present application are described completely in combination with the drawings, it should be noted that the described embodiments are only a part of the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the present application.

Claims

1. A wet brake of a drive axle of a wheel excavator, which is installed in a housing of the drive axle and cooperates with a half shaft of the drive axle, comprising a support seat positioned on the housing and coaxially sleeved outside the half shaft, a parking brake piston cooperated with one side of the support seat to form a parking brake oil chamber, a service brake piston cooperated with the other side of the support seat to form a service brake oil chamber, a butterfly spring assembled on the support seat and abutting against the parking brake piston, a tooth sleeve in spline cooperation with the half shaft, a friction plate set in spline cooperation assembled between the tooth sleeve and the housing, and the friction plate set is clamped between the service brake piston and a connecting disc fixed with the outer housing, characterized in that: The parking brake piston is fixed with an axially arranged pin shaft which is guided through the support seat and abuts against the service brake piston, an adjusting bolt is screwed into the service brake piston in parallel with the pin shaft, and a return spring is sleeved on the adjusting bolt and compressed with the service brake piston pressing the friction plate set.

2. The wet brake for a wheel excavator drive axle according to claim 1, characterized in that: The parking brake piston is provided with a piston through hole with a sink surface, and the pin shaft is provided with a threaded blind hole coaxially aligned with the piston through hole, a connecting screw is screwed in the threaded blind hole through the piston through hole to fix one end of the pin shaft on the parking brake piston, and the sink surface of the piston through hole is provided with a sealing washer pressed by the head of the connecting screw.

3. The wet brake for a wheel excavator drive axle according to claim 2, characterized in that: The support seat is provided with a support seat through hole which is guided with the pin shaft, the support seat through hole is communicated with the parking brake oil cavity, the pin shaft passes through the parking brake oil cavity and the support seat through hole and abuts against the service brake piston, and the pin shaft is provided with a sealing ring tightly abutting against the inner wall of the support seat through hole.

4. The wet brake for a wheel excavator drive axle according to claim 1, characterized in that: The support seat is threadedly sleeved with a locking nut which abuts against the parking brake piston, and the butterfly spring is axially compressed on the outer end surface of the parking brake piston by the locking nut.

5. The wet brake for a wheel excavator drive axle of claim 1, wherein: The support seat is provided with a through hole through which the adjusting bolt passes, one end of the return spring abuts against the head of the adjusting bolt, and the other end abuts against the support seat.

6. The wet brake for a wheel excavator drive axle of claim 1, wherein: The friction plate set comprises steel sheets which are formed with spline cooperation with the housing and friction plates which are formed with spline cooperation with the tooth sleeve, the steel sheets and the friction plates are alternately and laminatedly arranged, the innermost steel sheet abuts against the service brake piston, and the outermost steel sheet abuts against the connecting disc.

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