Auxiliary steering brake valve

Abstract

The invention discloses an auxiliary steering brake valve, belongs to the field of brake-steering systems, and solves the problems that an existing auxiliary brake valve is large in occupied space and insufficient in brake oil supply amount of a high-power machine type. The valve comprises a main valve body, a left push rod assembly, a right push rod assembly, the main valve body, a left reversing valve set, a right reversing valve set and a brake valve set are arranged on the main valve body, a left valve cavity, a middle valve cavity and a right valve cavity which are mutually independent and isolated from the outside are formed in the main valve body, and the left valve cavity is provided with the left reversing valve set capable of sliding in the axial direction. The middle valve cavity is provided with a brake valve set capable of sliding in the axial direction, the right valve cavity is provided with a right reversing valve set capable of sliding in the axial direction, and the left reversing valve set and the brake valve set are jointly connected with a left push rod assembly used for driving the left reversing valve set and the brake valve set to move. The auxiliary steering brake valve is small in occupied space, high in brake output pressure, large in generated brake torque, capable of guaranteeing the brake effect and capable of being used on large-tonnage hydraulic brake vehicle models.

Description

Technical Field

[0001] The invention relates to the technical field of braking and steering, and in particular to an auxiliary steering brake valve. Background Art

[0002] At present, in order to improve the flexibility of the whole machine, the existing agricultural vehicles in China, such as tractors, or loaders in the field of engineering vehicles, will reduce the turning radius of the whole vehicle by adopting the method of unilateral braking, that is, a set of braking systems are set on the left and right wheel hubs respectively. When there is no need for assisted steering, the left and right brake pedals are locked through a mechanical locking mechanism, so that the two sets of braking systems brake at the same time; when unilateral braking assisted steering is required, the mechanical locking mechanism is unlocked, and the left and right brake pedals can be braked separately to realize the function of unilateral braking assisted steering. At present, there are two methods to achieve unilateral braking: vacuum assisted braking and hydraulic assisted braking. Due to the problems of insufficient braking force, slow response speed, complex layout, high cost, etc. of the vacuum assisted braking system, more and more manufacturers use hydraulic assisted braking.

[0003] After searching, a dual master cylinder assembly with publication number CN 1906070A is found, comprising a single integral body, wherein the body includes a left-side serial master cylinder and a right-side serial master cylinder, wherein the left-side serial master cylinder includes a left-side main chamber contained in the body and a left-side auxiliary chamber contained in the body, and the right-side serial master cylinder includes a right-side main chamber contained in the body and a right-side auxiliary chamber contained in the body, and the left-side serial master cylinder operates independently of the right-side serial master cylinder; according to an embodiment, the left-side serial master cylinder can be connected to a left-side brake pedal, and the right-side serial master cylinder can be connected to a right-side brake pedal, and the left-side brake pedal and the right-side brake pedal can be selectively connected together, or the pedals can be optionally disconnected, and when one of the pedals is operated, one side of the vehicle is braked, so that the vehicle realizes the function of unilateral braking auxiliary steering, and when the pedals on both sides are operated at the same time, the vehicle realizes bilateral braking.

[0004] However, due to the large size of this dual master cylinder assembly, the layout of the entire structure will be subject to many restrictions when in use. As agricultural vehicles and engineering vehicles develop towards high power, multi-function and high efficiency, the carrying mass and maximum speed of the vehicle are improved, and the requirements for lightweight and compact vehicles are becoming higher and higher. Due to structural limitations, the hydraulic power-assisted brake can no longer meet the space layout requirements in terms of axial size and is difficult to be arranged in the cab. At the same time, various OEMs are also gradually developing large-tonnage hydraulic brake vehicles. The existing structure of the hydraulic power-assisted brake can supply a limited amount of oil to the brake, which cannot meet the oil demand of the brake with a large braking torque. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide an auxiliary steering brake valve in view of the above-mentioned deficiencies in the prior art, which occupies a small space, is convenient for vehicle layout, has a fast response speed, a high brake output pressure, generates a large braking torque, has stable braking performance, ensures braking effect, and can be used on large-tonnage hydraulic brake vehicle models.

[0006] The technical solution adopted by the present invention is: an auxiliary steering brake valve, including a main valve body, the main valve body is provided with a left push rod assembly, a right push rod assembly, a main valve body, a left reversing valve group, a right reversing valve group, and a brake valve group, the main valve body is internally formed with a left valve chamber, an intermediate valve chamber and a right valve chamber which are independent of each other and isolated from the outside world, the left valve chamber is provided with an axially slidable left reversing valve group, the intermediate valve chamber is provided with an axially slidable brake valve group, the right valve chamber is provided with an axially slidable right reversing valve group, the left reversing valve group and the brake valve group are jointly connected with a left push rod assembly for driving their movement, and the right reversing valve group and the brake valve group are jointly connected with a right push rod assembly for driving their movement.

[0007] Furthermore, an oil inlet and an oil drain port connected to the middle valve chamber are formed on the side wall of the main valve body, and the main valve body is also provided with a left working oil port connected to the left valve chamber, and the main valve body is also provided with a right working oil port connected to the right valve chamber, wherein the oil inlet is connected to the high-pressure oil source of the accumulator, the oil drain port is connected to the oil tank, the right working oil port and the left working oil port are respectively connected to the brakes on both sides, and the main valve body is formed with a working oil channel and an oil drain channel connected to the left valve chamber, the middle valve chamber and the right valve chamber, and the oil drain channel is connected to the upper part of the left valve chamber, the middle valve chamber and the right valve chamber.

[0008] Furthermore, the left reversing valve group and the right reversing valve group are the same in volume and structure. The left reversing valve group includes a first plunger, a cushion block, a first spring seat, a first return spring, a second return spring, a reversing valve body, and a reversing valve core. The first plunger is slidably connected inside the left valve chamber. The cushion block is arranged on the groove step of the first plunger. One end of the first spring seat is slidably connected along the inside of the blind hole of the first plunger, and the other end is arranged above the reversing valve core. The upper and lower ends of the second return spring are respectively in contact with the cushion block and the first spring seat. The upper and lower ends of the first return spring are respectively in contact with the cushion block and the reversing valve body. The reversing valve body is fixed in the left valve chamber of the main valve body. The reversing valve core is arranged inside the reversing valve body and is slidably connected to the reversing valve body.

[0009] Furthermore, the left reversing valve group also includes a retaining ring, a third return spring, and a valve seat. The valve seat is arranged below the reversing valve core and the reversing valve body and is fixedly connected to the reversing valve body. One end of the valve seat is formed with a conical surface that seals with the second conical surface of the reversing valve core. The retaining ring is arranged in the annular groove of the reversing valve core. A third return spring is arranged between the retaining ring and the reversing valve body to enable the reversing valve core to always approach the first spring seat.

[0010] Furthermore, the reversing valve core of the left reversing valve group is a cylindrical structure, an annular protrusion is formed along the lower part of the cylinder, and a first conical surface and a second conical surface are formed on the upper and lower sides of the annular protrusion.

[0011] Furthermore, an upward axial blind hole is provided at the lower portion of the reversing valve core, and the axial blind hole is communicated with the left valve chamber via through holes arranged along the circumferential direction.

[0012] Furthermore, the left reversing valve group also includes a third sealing ring and a fourth sealing ring, the reversing valve body is a cylindrical structure, and an upper annular oil channel and a lower annular oil channel are formed on the outside of the reversing valve body from top to bottom, the upper annular oil channel is connected to the working oil channel of the brake valve group, and the lower annular oil channel is connected to the left working oil port, and the bottoms of the upper annular oil channel and the lower annular oil channel are respectively provided with oil channel through holes and are connected to the inside of the reversing valve body through the oil channel through holes.

[0013] Furthermore, three external sealing grooves are provided on the outside of the reversing valve body, and the three external sealing grooves are respectively located on both sides of the upper annular oil channel and the lower annular oil channel, and a fourth sealing ring is installed in each of the external sealing grooves. An internal sealing groove that seals with the reversing valve core is formed inside the reversing valve body, and a third sealing ring is installed in the internal sealing groove.

[0014] Furthermore, the brake valve group includes a valve core, which is inside the middle valve cavity and slidably connected to the middle valve cavity. The brake valve group also includes a plug, a plunger and a valve core return spring. The plug is fixedly connected to the bottom of the main valve body, and the plunger is located above the middle valve cavity.

[0015] Furthermore, the brake valve group also includes a positioning steel ball, a spring seat, a return spring, and a pressure-adjusting spring. The spring seat is located below the plunger, and the upper and lower ends of the pressure-adjusting spring are respectively in contact with the plunger and the spring seat. A positioning steel ball is embedded below the spring seat, and the positioning steel ball is rotatably connected to the valve core. One end of the return spring is in contact with the plunger, and the other end is in contact with the main valve body.

[0016] Beneficial Effects

[0017] Compared with the prior art, the present invention has the following advantages:

[0018] 1. The auxiliary steering brake valve of the present invention controls the flow rate of the output hydraulic oil by moving the valve core, has a fast response speed, high brake output pressure, reliable braking, can meet the displacement requirements of larger tonnage vehicle models, and has a wider range of applications.

[0019] 2. The auxiliary steering brake valve of the present invention integrates the left reversing valve group, the right reversing valve group and the brake valve group in the same valve body and arranges them side by side, making its structure more compact and small, which can effectively reduce the axial size of the assembly, and can also reduce the weight of the assembly, while making the structural layout of the whole vehicle more compact and reasonable. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0021] Figure 2 It is a cross-sectional structural schematic diagram of the present invention.

[0022] Figure 3 It is a partially enlarged schematic diagram of the left reversing valve group of the present invention.

[0023] Figure 4 It is a schematic diagram of the left reversing valve core of the present invention.

[0024] Figure 5 It is a schematic diagram of the left reversing valve body of the present invention.

[0025] Figure 6 It is a partial schematic diagram of the brake valve group of the present invention.

[0026] Figure 7 It is a schematic diagram of a pedal according to the present invention.

[0027] Figure 8 It is a schematic diagram of the structure after the double-sided push rods of the present invention move.

[0028] Fig. 9 It is a schematic diagram of the structure after the left push rod of the present invention moves.

[0029] Among them: 1-valve body, 101-oil inlet, 102-oil drain, 104-left working oil port, 103-right working oil port, 105-left valve chamber, 106-middle valve chamber, 107-right valve chamber, 108-oil drain channel, 109-working oil channel, 2-left push rod assembly, 201-push rod, 202-push rod seat, 203-pressure block, 3-right push rod assembly, 4-left reversing valve group, 401-first plunger, 402-pad, 403-first return spring, 404-second return spring, 405-first spring seat, 406-retaining ring, 407-third return spring, 408-reversing valve core, 410-reversing valve body, 40 9-third sealing ring, 411-valve seat, 412-fourth sealing ring, 5-brake valve group, 501-plunger, 502-pressure regulating spring, 505-steel ball, 504-spring seat, 503-reset spring, 506-valve core, 507-valve core reset spring, 508-plug, 6-right reversing valve group, 7-right pedal, 8-connection system, 9-left pedal, 408c-annular protrusion, 408a-first cone surface, 408b-second cone surface, 408d-axial blind hole, 410a-external sealing groove, 410b-inner sealing groove, 410c-upper annular oil channel, 410d-lower annular oil channel, 410e-oil channel through hole. DETAILED DESCRIPTION

[0030] The present invention will be further described below with reference to the specific embodiments in the accompanying drawings.

[0031] See also Figure 1-9 As shown, an auxiliary steering brake valve of the present invention comprises a main valve body 1, on which a left push rod assembly 2, a right push rod assembly 3, a main valve body 1, a left reversing valve group 4, a right reversing valve group 6, and a brake valve group 5 are arranged. A left valve chamber 105, an intermediate valve chamber 106, and a right valve chamber 107 which are independent of each other and isolated from the outside are formed inside the main valve body 1. The left valve chamber 105 is provided with an axially slidable left reversing valve group 4, the intermediate valve chamber 106 is provided with an axially slidable brake valve group 5, the right valve chamber 107 is provided with an axially slidable right reversing valve group 6, and the left reversing valve group 4 and the brake valve group 5 are connected together with a valve for driving them. The moving left push rod assembly 2, right reversing valve group 6 and brake valve group 5 are connected together with a right push rod assembly 3 for driving the movement thereof. The left push rod assembly 2 can be operated alone to apply force to the left reversing valve group 4 and brake valve group 5, and the right push rod assembly 3 can be operated alone to apply force to the right reversing valve group 6 and brake valve group 5. The left push rod assembly 2 and the right push rod assembly 3 can realize the unilateral auxiliary steering function through the operation of the pedal alone; the left push rod assembly 2 and the right push rod assembly 3 can simultaneously apply force to the left reversing valve group 4, the brake valve group 5 and the right reversing valve group 6 through the operation of the pedal to realize the function of bilateral braking.

[0032] Specifically, an oil inlet 101 and an oil drain port 102 communicating with the middle valve cavity 106 are provided on the side wall of the main valve body 1, and the main valve body 1 is also provided with a left working oil port 104 communicating with the left valve cavity 105, and the main valve body 1 is also provided with a right working oil port 103 communicating with the right valve cavity 107, wherein the oil inlet 101 is communicated with the high-pressure oil source of the accumulator, the oil drain port 102 is communicated with the oil tank, the right working oil port 103 and the left working oil port 104 are respectively communicated with the brakes on both sides, and the main valve body 1 is formed with a working oil passage 109 and an oil drain passage 108 communicating with the left valve cavity 105, the middle valve cavity 106 and the right valve cavity 107, and the oil drain passage 108 is communicated with the upper part of the left valve cavity 105, the middle valve cavity 106 and the right valve cavity 107, and the left push rod assembly 2 acts on the left reversing When the right push rod assembly 3 acts on the right reversing valve group 6 and the brake valve group 5, the right working oil port 103 is connected to the middle valve chamber 106 through the right valve chamber 107 and the working oil passage 109, and the left working oil port 104 closes the working oil passage 109 through the left reversing valve group 4; when the left push rod assembly 2 and the right push rod assembly 3 act on the left reversing valve group 4, the brake valve group 5 and the right reversing valve group 6 at the same time, the left working oil port 104 and the right working oil port 103 are connected to the middle valve chamber 106 through the left valve chamber 105, the working oil passage 109, the right valve chamber 107.

[0033] Continue to refer to Figure 2 As shown, the left reversing valve group 4 and the right reversing valve group 6 are identical in volume and structure, and the left push rod assembly 2 and the right push rod assembly 3 are identical in volume and structure. Therefore, only the composition of the left reversing valve group 4 and the left push rod assembly 2 will be described in detail below.

[0034] Preferably, the left reversing valve group 4 and the right reversing valve group 6 have the same volume and structure. The left reversing valve group 4 includes a first plunger 401, a cushion block 402, a first spring seat 405, a first return spring 403, a second return spring 404, a reversing valve body 410, and a reversing valve core 408. The first plunger 401 is slidably connected inside the left valve chamber 105, the cushion block 402 is arranged on the groove step of the first plunger 401, one end of the first spring seat 405 is arranged to be slidably connected inside the blind hole of the first plunger 401, and the other end is arranged above the reversing valve core 408, and the second return spring 404 is arranged above and below the reversing valve core 408. The two ends are respectively in contact with the cushion block 402 and the first spring seat 405, the second return spring 404 is fixed by the cushion block 402 to limit the downward movement of the first spring seat 405, the upper and lower ends of the first return spring 403 are respectively in contact with the cushion block 402 and the reversing valve body 410, the first return spring 403 is used to limit the movement of the reversing valve body 410, the first return spring 403 is also used to restore the first plunger 401 to its initial state, the reversing valve body 410 is fixed in the left valve chamber 105 of the main valve body 1, and the reversing valve core 408 is arranged inside the reversing valve body 410 and is slidably connected to the reversing valve body 410.

[0035] Continue to refer to Figure 3 As shown, there is a gap between the first spring seat 405 of the left reversing valve group 4 and the reversing valve core 408, which prevents the first spring seat 405 from contacting the reversing valve core 408 and causing the working oil channel 109 to be connected to the left working oil port 104, making it impossible to achieve the unilateral braking auxiliary steering function.

[0036] Further, the left reversing valve group 4 further includes a retaining ring 406, a third return spring 407, and a valve seat 411. The valve seat 411 is arranged below the reversing valve core 408 and the reversing valve body 410 and is fixedly connected to the reversing valve body 410. One end of the valve seat 411 is formed with a conical surface that seals with the second conical surface of the reversing valve core 408. The retaining ring 406 is arranged in the annular groove of the reversing valve core 408. A third return spring 407 is arranged between the retaining ring 406 and the reversing valve body 410 to make the reversing valve core 408 always approach the first spring seat 405. The third return spring 407 is used to drive the reversing valve core 408 to move upward.

[0037] Further, refer to Figure 4 As shown, the reversing valve core 408 of the left reversing valve group 4 is a cylindrical structure, and an annular protrusion 408c is formed along the lower part of the cylinder. The annular protrusion 408c is formed with a first conical surface 408a and a second conical surface 408b on the upper and lower sides. The first conical surface 408a is sealed with the reversing valve body 410 to close the working oil port 104 and the high-pressure oil flowing into the brake valve group 5 through the working oil channel 109. The second conical surface 408b is sealed with the conical surface 411a of the valve seat to close the channel between the working oil port 104 and the oil drain port 102.

[0038] Continue to refer to Figure 4 As shown, an upward axial blind hole 408d is provided at the lower part of the reversing valve core 408, and the axial blind hole 408d is connected with the left valve chamber 105 through the through holes arranged along the circumferential direction. When the left reversing valve group is not working, the left working oil port 104 is connected with the oil drain port 102, and the hydraulic oil returned by the brake enters the blind hole 408d through the left working oil port, and enters the oil tank through the through hole 408e through the oil drain port 102, so that the vehicle is fully braked.

[0039] Reference Figure 3 As shown, the left reversing valve group 4 also includes a third sealing ring 409 and a fourth sealing ring 412. The reversing valve body 410 is a cylindrical structure. An upper annular oil passage 410c and a lower annular oil passage 410d are formed on the outer side of the reversing valve body 410 from top to bottom. The upper annular oil passage 410c is connected to the working oil passage 109 of the brake valve group 5, and the lower annular oil passage 410d is connected to the left working oil port 104. The bottoms of the upper annular oil passages 410c and the lower annular oil passages 410d are respectively provided with oil passage through holes 410e and are connected to the inside of the reversing valve body 410 through the oil passage through holes 410e. The oil passage through holes 410e at the bottoms of the upper annular oil passages 410c and the lower annular oil passages 410d are evenly arranged circumferentially.

[0040] Further, refer to Figure 5 As shown, three outer sealing grooves 410a are provided on the outside of the reversing valve body 410, and the three outer sealing grooves 410a are respectively located on both sides of the upper annular oil channel 410c and the lower annular oil channel 410d, and a fourth sealing ring 412 is installed in each of the outer sealing grooves 410a. An inner sealing groove 410b that seals with the reversing valve core 408 is formed inside the reversing valve body 410, and a third sealing ring 409 is installed in the inner sealing groove 410b. The fourth sealing ring is used to separate the left working oil port, the working oil channel and the oil drain port channel, and the third sealing ring is used to prevent the hydraulic oil in the working oil channel 109 from entering the oil drain port, thereby causing pressure relief and failure of braking.

[0041] Continue to refer to Figure 5 As shown, an inclined surface 410f is formed inside the reversing valve body 410 and is sealed with the first conical surface 408a of the reversing valve core. It is used to separate the left working oil port 104 from the right working oil port 103 when the right push rod assembly 3 operates the force on the right reversing valve group 6, thereby realizing unilateral braking assisted steering of the vehicle.

[0042] Furthermore, the brake valve group 5 includes a valve core 506, which is inside the intermediate valve chamber 106 and is slidably connected to the intermediate valve chamber 106. The brake valve group 5 also includes a plug 508, a plunger 501 and a valve core return spring 507. The plug 508 is fixedly connected to the bottom of the main valve body 1, and the plunger 501 is located above the intermediate valve chamber 106. The plunger 501 is used to drive the valve core 506 to move downward, and the valve core return spring 507 is used to drive the valve core 506 to move upward.

[0043] Furthermore, the brake valve group 5 also includes a positioning steel ball 505, a spring seat 504, a return spring 503, and a pressure-adjusting spring 502. The spring seat 504 is located below the plunger 501. The upper and lower ends of the pressure-adjusting spring 502 are respectively in contact with the plunger 501 and the spring seat 504. A positioning steel ball 505 is embedded below the spring seat 504. The positioning steel ball 505 is rotatably connected to the valve core 506. The positioning steel ball 505 can prevent the spring seat 504 from getting stuck due to skewness during the operation of the brake valve group 5. One end of the return spring 503 is in contact with the plunger 501, and the other end is in contact with the main valve body 1. The return spring 503 is used to drive the plunger 501 to move upward.

[0044] Reference below Figure 7-9 The working process of the auxiliary steering brake valve according to an embodiment of the present invention is described. Since the left reversing valve group 4 and the right reversing valve group 6 have the same volume and structure, and the left push rod assembly 2 and the right push rod assembly 3 have the same volume and structure, only the working process of the left reversing valve group 4 and the left push rod assembly 2 will be described in detail below. The direction indicated by the arrow in the figure is the flow direction of the hydraulic oil.

[0045] Figure 7 A left pedal 9 and a right pedal 7 connected to the auxiliary steering brake valve of an embodiment of the present invention are schematically shown. In addition, a connection system 8 (known in the art) is schematically shown, which can selectively connect the left pedal and the right pedal together, or optionally disconnect the pedals, thereby allowing one pedal to move independently relative to the other pedal, thereby selectively activating the left brake or the right brake to facilitate steering of the vehicle, which is further described below.

[0046] Reference Figure 7 As shown, when the vehicle is running normally, the valve core 506 of the auxiliary steering brake valve of the present invention is located in the working position shown in the figure, and the valve core 506 connects the left working oil port 104, the right working oil port 103 with the oil drain port 102, and closes the oil inlet 101.

[0047] Reference Figure 8As shown, when the vehicle needs bilateral braking, the left pedal 9 and the right pedal 7 of the vehicle are connected together. When the driver steps on the pedals on both sides, the pedals drive the push rod seat 202 and the pressure block 203 to move through the push rods 201 on both sides, and the pressure block then drives the first plunger 401, the plunger 501 and the right plunger 401' to move in the left valve chamber 105, the middle valve chamber 106 and the right valve chamber 107 respectively. When the first return spring 40 and the second return spring 404 are compressed to a certain extent, the first spring seat 405 begins to contact the reversing valve core 408, and the first spring seat 405 pushes the reversing valve core 408 to move toward the valve seat 411, so that the second conical surface 408b of the reversing valve core and the conical surface 411a of the valve seat are sealed and matched to close the channels of the left working oil port 104, the right working oil port 103 and the oil drain port 102, so that the left working oil mouth channel and the right working oil mouth channel are connected to each other. Since the plunger 501 of the brake valve group 5 is simultaneously subjected to the force of the pressure blocks 203 on both sides, the plunger 501 is driven to move downward. At this time, the pressure regulating spring 502 begins to be compressed, pushing the spring seat 504 to move downward. The spring seat 504 pushes the valve core 506 to move downward through the positioning steel ball 505. The valve core reset spring 507 is also compressed at the same time. At this time, the oil drain port 102 begins to be disconnected from the left working oil port 104 and the right working oil port 103. The valve core 506 first moves to the middle working position, disconnecting the corresponding oil inlet port 101, the working oil channel 109 and the oil drain port 102. Then the valve core 506 continues to move downward, and the oil inlet port 101 is disconnected from the left working oil port 104 and the right working oil port 103. 4. The right working oil port 103 starts to communicate. At this time, a part of the hydraulic oil entering from the oil inlet 101 enters the left reversing valve group 4 and the right reversing valve group 6 through the working oil channel 109, and then flows out from the left working oil port 104 and the right working oil port 103 to the left brake and the right brake respectively. Another small part of the hydraulic oil enters the feedback channel 506b from the valve core damping hole 506a. The hydraulic oil in the feedback channel 506b gives the valve core 506 an upward force, which, together with the force of the valve core return spring 507 and the spring force generated by the pressure regulating spring 502, reaches a balance. The left working oil port 104 and the right working oil port 103 simultaneously output high-pressure hydraulic oil to achieve bilateral braking of the vehicle. Since the hydraulic oil pressures of the left working oil port channel and the right working oil port channel are consistent, it is ensured that when the left and right pedals are stepped on with different forces, the brake pressures on both sides are the same, and there will be no pressure difference, so that the vehicle will not deviate during the bilateral braking process.

[0048] Reference Fig. 9As shown, when the vehicle needs unilateral braking auxiliary steering, the left pedal 9 of the vehicle is disconnected from the right pedal 7. When the driver steps on the left pedal 9 alone, the left pedal 9 drives the push rod seat 202 and the pressure block 203 to move through the push rod 201, and the pressure block then drives the first plunger 401 and the plunger 501 to move in the left valve chamber 105 and the middle valve chamber 106 respectively. When the first return spring 403 and the second return spring 404 are compressed to a certain extent, the first spring seat 405 begins to contact the reversing valve core 408, and the first spring seat 405 pushes the reversing valve core 408 to move toward the valve seat 411, so that the second conical surface 408b of the reversing valve core and the conical surface 411a of the valve seat are sealed and matched to close the channel between the working oil port 104 and the oil drain port 102, so that the left working oil mouth channel is connected with the working oil channel 109. As the plunger 501 of the brake valve group 5 is subjected to the force of the pressure block 203, the plunger 501 is driven to move downward. At this time, the pressure regulating spring 502 begins to be compressed, pushing the spring seat 504 to move downward. The spring seat 504 pushes the valve core 506 to move downward through the positioning steel ball 505. The valve core reset spring 507 is also compressed at the same time. At this time, the oil drain port 102 begins to be disconnected from the left working oil port 104. The valve core 506 first moves to the middle working position, disconnecting the corresponding oil inlet port 101, the working oil channel 109 and the oil drain port 102. Then the valve core 506 continues to move downward, and the oil inlet port 101 is disconnected from the left working oil port 104. The working oil port 104 starts to be connected. At this time, a part of the hydraulic oil entering from the oil inlet 101 enters the left reversing valve group 4 through the working oil channel 109 and then flows out from the left working oil port 104. Another small part of the hydraulic oil enters the feedback channel 506b from the valve core damping hole 506a. The hydraulic oil in the feedback channel 506b gives the valve core 506 an upward force, which together with the force of the valve core return spring 507 and the spring force generated by the pressure regulating spring 502 is balanced. The left working oil port 104 outputs high-pressure hydraulic oil to drive the externally connected left brake or right brake to work, thereby realizing unilateral braking assisted steering of the vehicle.

[0049] This working process is also applicable to the movement of the right push rod assembly and the right reversing valve assembly and the brake valve group corresponding to the right pedal in the corresponding right valve chamber and middle valve chamber respectively.

[0050] When the auxiliary steering brake valve of this embodiment is in use, the flow rate of the output hydraulic oil is controlled by moving the valve core, and the response speed is fast, the brake output pressure is high, and the braking is reliable. It can meet the displacement requirements of brakes of larger tonnage vehicles and has a wider range of applications. The left reversing valve group, the right reversing valve group and the brake valve group are integrated in the same valve body and arranged side by side, making its structure more compact and small, which can effectively reduce the axial size of the assembly, and can also reduce the weight of the assembly. At the same time, it can make the structural layout of the entire vehicle more compact and reasonable.

[0051] The above is only a preferred embodiment of the present invention. It should be pointed out that for those skilled in the art, several modifications and improvements can be made without departing from the structure of the present invention, which will not affect the effect of the implementation of the present invention and the practicality of the patent.

Claims

1. An auxiliary steering brake valve, characterized in that: The invention comprises a main valve body (1), wherein the main valve body (1) is provided with a left push rod assembly (2), a right push rod assembly (3), a main valve body (1), a left reversing valve group (4), a right reversing valve group (6), and a brake valve group (5); the main valve body (1) is internally formed with a left valve chamber (105), an intermediate valve chamber (106), and a right valve chamber (107) which are independent of each other and isolated from the outside world; the left valve chamber (105) is provided with an axially slidable left reversing valve group (4); the intermediate valve chamber (106) is provided with an axially slidable brake valve group (5); the right valve chamber (107) is provided with an axially slidable right reversing valve group (6); the left reversing valve group (4) and the brake valve group (5) are commonly connected to a left push rod assembly (2) for driving the movement thereof; and the right reversing valve group (6) and the brake valve group (5) are commonly connected to a right push rod assembly (3) for driving the movement thereof.

2. The auxiliary steering brake valve according to claim 1, characterized in that: The main valve body (1) has an oil inlet (101) and an oil drain (102) on its side wall, the main valve body (1) also has a left working oil port (104) connected to the left valve chamber (105), and the main valve body (1) also has a right working oil port (103) connected to the right valve chamber (107), wherein the oil inlet (101) is connected to the high-pressure oil source of the accumulator, and the oil drain (102) is connected to the left valve chamber (105). 02) is connected to the oil tank, the right working oil port (103) and the left working oil port (104) are respectively connected to the brakes on both sides, the main valve body (1) is formed with a working oil passage (109) and an oil drain passage (108) which are connected to the left valve chamber (105), the middle valve chamber (106) and the right valve chamber (107), and the oil drain passage (108) is connected to the upper part of the left valve chamber (105), the middle valve chamber (106) and the right valve chamber (107).

3. The auxiliary steering brake valve according to claim 1, characterized in that: The left reversing valve group (4) and the right reversing valve group (6) are of the same volume and structure. The left reversing valve group (4) comprises a first plunger (401), a cushion block (402), a first spring seat (405), a first return spring (403), a second return spring (404), a reversing valve body (410), and a reversing valve core (408). The first plunger (401) is slidably connected inside the left valve chamber (105). The cushion block (402) is arranged on a groove step of the first plunger (401). One end of the first spring seat (405) is arranged along the first return spring (403). A plunger (401) is slidably connected inside the blind hole, and the other end is arranged above the reversing valve core (408). The upper and lower ends of the second return spring (404) are respectively in contact with the cushion block (402) and the first spring seat (405), and the upper and lower ends of the first return spring (403) are respectively in contact with the cushion block (402) and the reversing valve body (410). The reversing valve body (410) is fixed in the left valve chamber (105) of the main valve body (1), and the reversing valve core (408) is arranged inside the reversing valve body (410) and is slidably connected to the reversing valve body (410).

4. The auxiliary steering brake valve according to claim 3, characterized in that: The left reversing valve group (4) further comprises a retaining ring (406), a third return spring (407), and a valve seat (411). The valve seat (411) is arranged below the reversing valve core (408) and the reversing valve body (410) and is fixedly connected to the reversing valve body (410). One end of the valve seat (411) is formed with a conical surface that seals with the second conical surface of the reversing valve core (408). The retaining ring (406) is arranged in the annular groove of the reversing valve core (408). A third return spring (407) is arranged between the retaining ring (406) and the reversing valve body (410) so that the reversing valve core (408) always has a direction close to the first spring seat (405).

5. The auxiliary steering brake valve according to claim 4, characterized in that: The reversing valve core (408) of the left reversing valve group (4) is a cylindrical structure, with an annular protrusion (408c) formed along the lower part of the cylinder, and a first conical surface (408a) and a second conical surface (408b) formed on the upper and lower sides of the annular protrusion (408c).

6. The auxiliary steering brake valve according to claim 3, characterized in that: An upward axial blind hole (408d) is provided at the lower part of the reversing valve core (408), and the axial blind hole (408d) is connected to the left valve chamber (105) via through holes arranged along the circumferential direction.

7. The auxiliary steering brake valve according to claim 3, characterized in that: The left reversing valve group (4) further comprises a third sealing ring (409) and a fourth sealing ring (412); the reversing valve body (410) is a cylindrical structure; an upper annular oil passage (410c) and a lower annular oil passage (410d) are sequentially formed on the outer side of the reversing valve body (410) from top to bottom; the upper annular oil passage (410c) is connected to the working oil passage (109) of the brake valve group (5); the lower annular oil passage (410d) is connected to the left working oil port (104); the groove bottoms of the upper annular oil passage (410c) and the lower annular oil passage (410d) are respectively provided with oil passage through holes (410e) and are connected to the interior of the reversing valve body (410) through the oil passage through holes (410e).

8. The auxiliary steering brake valve according to claim 7, characterized in that: The outside of the reversing valve body (410) is provided with three external sealing grooves (410a), and the three external sealing grooves (410a) are respectively located on both sides of the upper annular oil channel (410c) and the lower annular oil channel (410d), and a fourth sealing ring (412) is installed in each of the external sealing grooves (410a). The inside of the reversing valve body (410) is formed with an internal sealing groove (410b) that seals with the reversing valve core (408), and a third sealing ring (409) is installed in the internal sealing groove (410b).

9. The auxiliary steering brake valve according to claim 1, characterized in that: The brake valve group (5) includes a valve core (506), and the valve core (506) is inside the middle valve cavity (106) and is slidably connected to the middle valve cavity (106). The brake valve group (5) also includes a plug (508), a plunger (501) and a valve core return spring (507). The plug (508) is fixedly connected to the bottom of the main valve body (1), and the plunger (501) is located above the middle valve cavity (106).

10. The auxiliary steering brake valve according to claim 9, characterized in that: The brake valve group (5) further comprises a positioning steel ball (505), a spring seat (504), a return spring (503), and a pressure regulating spring (502); the spring seat (504) is located below the plunger (501); the upper and lower ends of the pressure regulating spring (502) are in contact with the plunger (501) and the spring seat (504) respectively; a positioning steel ball (505) is embedded below the spring seat (504); the positioning steel ball (505) is rotatably connected to the valve core (506); one end of the return spring (503) is in contact with the plunger (501), and the other end is in contact with the main valve body (1).

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