Wide-turning-angle steering gear and vehicle

Abstract

The invention provides a wide-turning-angle steering gear and a vehicle. The wide-turning-angle steering gear comprises a valve body, a valve element, a valve sleeve and a meter, and seven flow distribution channels are arranged on the valve body in the circumferential direction in a surrounding mode; the valve element is provided with four working grooves for conveying oil liquid to the steering executing mechanism and four oil return grooves for receiving the oil liquid from the steering executing mechanism, and the working grooves and the oil return grooves are arranged in a staggered mode in the circumferential direction. The valve sleeve is provided with a first oil hole and a second oil hole, the first oil hole and the second oil hole are arranged in a staggered mode in the circumferential direction so that any one of the first oil hole and the second oil hole can be matched with the working groove to form a working valve port, and the other one of the first oil hole and the second oil hole can be matched with the oil return groove to form an oil return valve port. By means of the arrangement, the opening range of the working valve port and the oil return valve port is large, more hydraulic flow can pass through, pressure loss can be reduced under the large-flow working condition, hydraulic noise and shaking generated by a system can be reduced, a flow amplification structure does not need to be used in a matched mode, and cost can be saved.

Description

Technical Field

[0001] The present application relates to the technical field of hydraulic steering gears, and particularly relates to a wide-angle steering gear and a vehicle. Background Art

[0002] A hydraulic steering gear is a cycloidal rotary valve type full hydraulic steering gear composed of a steering valve and a cycloidal metering motor. The hydraulic steering gear and a full hydraulic steering system composed of an oil supply pump, a relief valve (or a flow dividing valve), a steering cylinder and other connecting accessories control the action of the steering cylinder through the hydraulic steering gear to realize hydraulic steering.

[0003] Among them, the steering valve is composed of a valve body, a valve sleeve, a valve core, a steel sheet type return spring, etc. The valve sleeve is sleeved on the outer periphery of the valve core. An oil inlet groove, a working groove and an oil return groove are arranged on the outer peripheral surface of the valve core. An oil inlet hole, a working hole and an oil return hole are oppositely arranged on the valve sleeve. When the valve core and the valve sleeve are in the middle position, the holes on the valve sleeve are misaligned with the grooves on the valve core so that the formed valve port is closed. When the valve core turns (i.e., turns left or right), a relative rotation angle is formed between the valve core and the valve sleeve, and the holes on the valve sleeve are communicated with the grooves on the valve core so that the formed valve port is opened, and the opening area of the valve port changes with the relative rotation angle between the valve sleeve and the valve core. However, in the prior art, the opening of the valve port formed by the cooperation of the grooves and holes on the valve core and the valve sleeve is small, and the hydraulic flow rate that can be satisfied is small. There will be large pressure and energy losses under large flow conditions, resulting in problems such as hydraulic noise and jitter in the steering system. Moreover, it needs to be used in conjunction with a flow amplification structure, which will increase the cost. Summary of the Invention

[0004] In view of this, the present application provides a wide-angle steering gear and a vehicle, which can solve the problems of pressure loss, noise and jitter in the steering system.

[0005] In order to achieve the above object, the present application provides the following technical solutions:

[0006] A wide-angle steering gear includes a valve body, a valve core, a valve sleeve, and a meter, wherein,

[0007] Seven distribution channels are circumferentially arranged around the valve body;

[0008] The valve core is provided with a working groove for delivering oil to the steering actuator and an oil return groove for receiving oil from the steering actuator. Four working grooves and four oil return grooves are provided and are staggered in the circumferential direction;

[0009] The valve sleeve is provided with a first oil hole and a second oil hole, and the first oil hole and the second oil hole are staggered in the circumferential direction so that any one of the first oil hole and the second oil hole can cooperate with the working groove to form a working valve port, and the other can cooperate with the oil return groove to form an oil return valve port.

[0010] Optionally, there are four sets of both the first oil holes and the second oil holes. Each set of the first oil holes has a plurality of oil holes with different diameters that are axially and circumferentially misaligned; each set of the second oil holes has a plurality of oil holes with different diameters that are axially and circumferentially misaligned.

[0011] Optionally, at the axial position corresponding to the first oil hole, a first widened portion is provided on the side walls of the working groove and the oil return groove, so that the first oil hole can communicate with the working groove or the oil return groove through the first widened portion;

[0012] At the axial position corresponding to the second oil hole, a second widened portion is provided on the side walls of the working groove and the oil return groove, so that the second oil hole can communicate with the working groove or the oil return groove through the second widened portion.

[0013] Optionally, the first widened portion and the second widened portion are arranged in an arc shape.

[0014] Optionally, the central angle range of the widest part of the working groove and the oil return groove with the first widened portion and the second widened portion is 25 - 30 degrees.

[0015] Optionally, the valve core is sequentially provided with an oil inlet groove, a first annular groove, an oil distribution groove for entering and exiting the meter, a second annular groove, a flow amplification groove, a third annular groove, and a working groove along the axial direction;

[0016] Among them, the first annular groove communicates with the oil inlet groove and part of the oil distribution groove, the second annular groove communicates with another part of the oil distribution groove and the flow amplification groove, and the third annular groove communicates with the flow amplification groove and the working groove.

[0017] Optionally, the valve core is provided with a plurality of oil inlet grooves along the circumferential direction, and the valve sleeve is provided with multiple groups of oil inlet holes along the circumferential direction, which can cooperate with the oil inlet grooves to form an oil inlet valve port;

[0018] Among them, there are four oil inlet grooves, and the valve sleeve is provided with four groups; and / or, each group of the oil inlet holes has a plurality of oil inlet holes with different diameters that are axially and circumferentially misaligned.

[0019] Optionally, two first oil distribution grooves and two second oil distribution grooves are alternately arranged along the circumferential direction of the valve core, and four oil distribution holes are arranged along the circumferential direction on the valve sleeve. The oil distribution holes can respectively cooperate with the first oil distribution groove and the second oil distribution groove to form a first oil distribution valve port and a second oil distribution valve port;

[0020] Among them, a switching structure is provided on the outer peripheral surface of the valve sleeve, and the oil distribution holes communicate with the switching structure, so that the oil distribution holes communicate with the inlet and outlet of the meter through the switching structure and the oil distribution channels on the valve body.

[0021] Optionally, the switching structure includes a first switching ring groove, a second switching ring groove, a first switching axial groove, and a second switching axial groove. Six first switching axial grooves and six second switching axial grooves are provided and arranged circumferentially in a staggered manner, and are axially located between the first switching ring groove and the second switching ring groove. The first switching axial groove communicates with the first switching ring groove, and the second switching axial groove communicates with the second switching ring groove;

[0022] Among them, two adjacent oil distribution holes are respectively arranged in the first switching axial groove and the second switching axial groove.

[0023] Optionally, the first oil distribution groove and the second oil distribution groove are wide grooves with a corresponding central angle range of 65 - 70 degrees.

[0024] Optionally, the valve core is provided with a plurality of flow amplification grooves circumferentially; the valve sleeve is provided with multiple groups of flow amplification holes circumferentially, which can cooperate with the flow amplification grooves to form a flow amplification valve port, and part of the oil fluid enters the working valve port through the flow amplification valve port without passing through the meter;

[0025] Among them, four flow amplification grooves are provided, and four groups of flow amplification holes are provided; and / or, each group of flow amplification holes has a plurality of holes with different diameters and arranged axially and circumferentially in a staggered manner.

[0026] Optionally, the valve core is provided with four oil inlet grooves circumferentially, and the valve core is provided with a first unloading hole and a second unloading hole. The inner wall of the valve sleeve is provided with a first diversion groove and a second diversion groove. When the valve core and the valve sleeve are in the middle position, the first diversion groove communicates the first unloading hole and the oil inlet groove, and the second diversion groove communicates the second unloading hole and the second oil distribution groove.

[0027] Optionally, the side wall of the oil inlet groove is provided with a first wedge-shaped groove, and the side wall of the first oil distribution groove is provided with a second wedge-shaped groove. The first wedge-shaped groove and the second wedge-shaped groove respectively extend axially to the same axial position as the first unloading hole and the second unloading hole.

[0028] Optionally, the valve core is provided with a first buffer groove and a second buffer groove communicating with the oil return groove, and the valve sleeve is provided with a first buffer hole and a second buffer hole. The first buffer hole and the second buffer hole are respectively communicated with the first oil hole and the second oil hole through the ring groove on the valve body; when the valve core turns to the right, the first buffer groove and the first buffer hole are communicated, and when the valve core turns to the left, the second buffer groove and the second buffer hole are communicated.

[0029] Optionally, two or four of the first buffer holes and the first buffer grooves are provided; two or four of the second buffer holes and the second buffer grooves are provided.

[0030] Optionally, both the first buffer groove and the second buffer groove are arranged to extend circumferentially.

[0031] Optionally, the valve sleeve is provided with an oil inlet hole and a static signal hole for communicating with the oil inlet hole, and a static signal groove is arranged on the end face of the valve core close to the oil inlet hole. When the valve core and the valve sleeve are in the middle position, the static signal hole is communicated with the static signal groove.

[0032] A vehicle includes the wide-angle steering gear described in any one of the above.

[0033] In the wide-angle steering gear and the vehicle provided by the present application, four working grooves and four oil return grooves are provided, and four groups of first oil holes and second oil holes are provided, so that the working grooves and the oil return grooves are set as wide grooves, that is, the six narrow grooves evenly distributed in the circumferential direction in the prior art are improved to four wide grooves evenly distributed in the circumferential direction, and the first oil holes and the second oil holes are set as large holes, that is, the six small holes evenly distributed in the circumferential direction in the prior art are improved to four groups of large holes evenly distributed in the circumferential direction. Moreover, a relatively large relative rotation angle can be provided between the valve core and the valve sleeve, so that the opening ranges of the formed working valve port and the oil return valve port are relatively large, more hydraulic flow can be passed through, the pressure loss can be reduced under large-flow working conditions, the hydraulic noise and vibration generated by the system can be reduced, and it is not necessary to use a flow amplification structure in cooperation, which is beneficial to cost saving. Description of the Drawings

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained according to the provided drawings without creative efforts.

[0035] Figure 1 It is a cross-sectional view of a wide-angle steering gear shown in some embodiments;

[0036] Figure 2 It is a three-dimensional view of a valve core shown in some embodiments;

[0037] Figure 3 It is a front view of a valve core shown in some embodiments;

[0038] Figure 4 It is a front view of a valve sleeve shown in some embodiments;

[0039] Figure 5Assembly front view of the spool valve and the valve sleeve shown for some embodiments;

[0040] Figure 6 For Figure 5 Schematic cross-sectional view at the A-A position in

[0041] Figure 7 For Figure 5 Schematic cross-sectional view at the B-B position in

[0042] Figure 8 For Figure 5 Schematic cross-sectional view at the C-C position in

[0043] Figure 9 For Figure 5 Schematic cross-sectional view at the D-D position in

[0044] Figure 10 For Figure 5 Schematic cross-sectional view at the E-E position in

[0045] Figure 11 For Figure 5 Schematic cross-sectional view at the F-F position in

[0046] Figure 12 Working principle diagram of a wide-angle steering gear shown for some embodiments.

[0047] In the figure:

[0048] 1. Spool valve; 2. Valve sleeve; 3. Valve body; 4. Meter;

[0049] 11. Inlet oil groove; 12. First ring groove; 13. First oil distribution groove; 14. Second oil distribution groove; 15. Second ring groove; 16. Flow amplification groove; 17. Third ring groove; 18. Working groove; 19. Return oil groove; 110. Second buffer groove; 111. Second widened part; 112. First widened part; 113. First buffer groove; 114. Second wedge groove; 115. Second unloading hole; 116. First wedge groove; 117. First unloading hole; 118. Static signal groove;

[0050] 21. Inlet oil hole; 22. Oil distribution hole; 23. First switching ring groove; 24. First switching axial groove; 25. Second switching axial groove; 26. Second switching ring groove; 27. Flow amplification hole; 28. First oil hole; 29. Second oil hole; 210. Second buffer hole; 211. First buffer hole; 212. LS ring groove. Detailed implementation manners

[0051] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present application.

[0052] As Figures 1 - 12 shown, the embodiment of the present application provides a wide-angle steering gear, which includes a valve body 3, a valve sleeve 2, a valve core 1, and a meter 4.

[0053] Seven distribution channels are circumferentially arranged around the valve body 3. One port of the distribution channel is arranged on the inner circumferential surface of the valve body 3, and the other port is communicated with the inlet and outlet of the meter. Specifically, the meter is set as a cycloidal metering motor. Since there are seven distribution channels arranged on the valve body 3, correspondingly, the cycloidal metering motor is provided with seven inlets and outlets, that is, the stator of the cycloidal metering motor is provided with seven teeth and the rotor is provided with six teeth. The seven inlets and outlets correspond to the seven teeth of the stator. The rotor and the stator cooperate and rotate in the form of six-seven teeth to switch three inlets and three outlets among the seven inlets and outlets.

[0054] The valve sleeve 2 is sleeved on the outer periphery of the valve core 1, the valve body 3 is sleeved on the outer periphery of the valve sleeve 2, a steel sheet return spring is arranged between the valve core 1 and the valve sleeve 2, and the rotor of the cycloidal metering motor is connected to the valve sleeve 2 through a linkage shaft and a pin. During the steering process, a certain torque is applied to the valve core 1, and the valve core 1 rotates and forms a certain angle relative to the valve sleeve 2, that is, a relative rotation angle is formed between the valve core 1 and the valve sleeve 2 (at this time, the steel sheet return spring is compressed by the valve core 1 and the valve sleeve 2 and stores elastic potential energy), so that the corresponding valve port between the valve core 1 and the valve sleeve 2 is opened, and the oil fluid enters the cycloidal metering motor through the distribution channel and pushes the rotor of the cycloidal metering motor to rotate. The rotor drives the valve sleeve 2 to rotate through the linkage shaft and the pin, so as to realize the metering of the oil fluid through the cycloidal metering motor. When the torque applied to the valve core 1 disappears, the steering stops, and the elastic force of the steel sheet return spring drives the valve core 1 and the valve sleeve 2 back to the initial middle position state, and the corresponding valve port between the valve core 1 and the valve sleeve 2 is closed.

[0055] An oil inlet groove 11, an oil distribution groove 13, an oil distribution groove 14, a working groove 18 and an oil return groove 19 are sequentially arranged along the axial direction on the spool 1. Oil inlet holes 21, oil distribution holes 22, a first oil hole 28 and a second oil hole 29 are arranged at corresponding positions on the valve sleeve 2 to cooperate to form an oil inlet valve port A1, an oil distribution valve port (including a first oil distribution valve port A2 and a second oil distribution valve port A3, and respectively communicating with the inlet and outlet of the meter 4), a working valve port A4 and an oil return valve port A5. Here, the working valve port A4 communicates with the inlet of the steering actuator to convey oil to the steering actuator. The oil return valve port A5 communicates with the outlet of the steering actuator to receive the oil from the steering actuator and return it to the fuel tank. The steering of the steering actuator is achieved through the cooperation of the working valve port A4 and the oil return valve port A5. Specifically, the steering actuator can be set as a steering hydraulic cylinder.

[0056] When the spool 1 and the valve sleeve 2 are in the middle position, the oil inlet valve port A1, the first oil distribution valve port A2, the second oil distribution valve port A3, the working valve port A4 and the oil return valve port A5 are all closed. When the spool 1 and the valve sleeve 2 generate a relative rotation angle, the oil inlet valve port A1, the first oil distribution valve port A2, the second oil distribution valve port A3, the working valve port A4 and the oil return valve port A5 are all opened. The oil in the hydraulic system sequentially passes through the oil inlet valve port A1, the first oil distribution valve port A2, the meter 4, the second oil distribution valve port A3, the working valve port A4, the steering actuator, the oil return valve port A5, and finally flows back to the hydraulic system (fuel tank). Through the measurement of the meter 4, the accurate control of the oil passing through the steering actuator is achieved to complete the accurate steering work.

[0057] In this solution, four working grooves 18 and four oil return grooves 19 are arranged on the spool 1 and are arranged in a staggered manner along the circumferential direction of the spool 1, so that an oil return groove 19 is arranged between two adjacent working grooves 18 in the circumferential direction, and a working groove 18 is arranged between two adjacent oil return grooves 19 in the circumferential direction. Correspondingly, four groups of the first oil holes 28 and the second oil holes 29 (each group can have one hole or multiple holes) are arranged on the valve sleeve 2 and are arranged in a staggered manner along the circumferential direction of the valve sleeve 2, so that a second oil hole 29 is arranged between two adjacent first oil holes 28 in the circumferential direction, and a first oil hole 28 is arranged between two adjacent second oil holes 29 in the circumferential direction. Moreover, when any one of the first oil hole 28 and the second oil hole 29 cooperates with the working groove 18 to form the working valve port A4, the other forms the oil return valve port A5 with the oil return groove 19.

[0058] It should be noted that the metering motor of the steering gear in the prior art generally adopts a form of six or seven teeth meshing and rotating. The valve body is connected to the seven inlets and outlets of the cycloidal metering motor through seven flow distribution channels. In order to cooperate with the seven flow distribution channels on the valve body, twelve oil distribution holes need to be provided on the valve sleeve, and twelve oil distribution grooves are provided on the valve core. Six of the oil distribution grooves are respectively connected to six oil inlet grooves, and the other six oil distribution grooves are respectively connected to six working grooves, so that six working grooves and six oil return grooves are provided on the valve core. Since the number of the working grooves and the oil return grooves in the circumferential direction is large, and both the working grooves and the oil return grooves are narrow grooves, the opening ranges of the formed working valve port and the oil return valve port are small, and the flow area is small.

[0059] Since there are four working grooves 18 and four oil return grooves 19, and there are four groups of first oil holes 28 and second oil holes 29, the working grooves 18 and the oil return grooves 19 can be set as wide grooves (that is, the six narrow grooves evenly distributed in the circumferential direction in the prior art are improved to four wide grooves evenly distributed in the circumferential direction), and the first oil holes 28 and the second oil holes 29 are set as large holes (that is, the six small holes evenly distributed in the circumferential direction in the prior art are improved to four groups of large holes evenly distributed in the circumferential direction). Moreover, a relatively large relative rotation angle can be provided between the valve core 1 and the valve sleeve 2 (for example, the valve core 1 and the valve sleeve 2 can have a relative rotation angle exceeding 60 degrees). Furthermore, the opening ranges of the formed working valve port A4 and the oil return valve port A5 are large, and more hydraulic flow can pass through. Under the condition of large flow, the pressure loss can be reduced, the hydraulic noise and jitter generated by the system can be reduced, and there is no need to use a flow amplification structure in cooperation, which is beneficial to cost saving.

[0060] It should be noted that two circumferentially surrounding annular grooves are arranged axially on the valve body 3 (there are two working annular grooves and one oil return annular groove at the tail on the valve body 3. When one working annular groove supplies oil to the steering actuator, the other working annular groove receives the oil return from the steering actuator. These two annular grooves are two working annular grooves), which are respectively used to communicate with the inlets and outlets of the steering actuator through the interfaces on the valve body 3. Correspondingly, the first oil holes 28 and the second oil holes 29 on the valve sleeve 2 are axially offset so as to respectively correspond to the two annular grooves on the valve body 3. Specifically, multiple groups of first oil holes 28 are arranged on the first circumferential path, multiple groups of second oil holes 29 are arranged on the second circumferential path, and the first circumferential path and the second circumferential path are axially spaced.

[0061] On the first circumferential path (i.e., at the axial position corresponding to the first oil hole 28), first widening portions 112 are provided on the side walls of the working groove 18 and the oil return groove 19. When the first oil hole 28 and the first widening portion 112 are opposite to each other, the first oil hole 28 can communicate with the working groove 18 or the oil return groove 19 through the first widening portion 112 to keep the valve port formed by the first oil hole 28 open. In this way, through the design of the first widening portion 112, the widths of the working groove 18 and the oil return groove 19 on the first circumferential path can be increased, thereby increasing the maximum opening area of the valve port formed by the first oil hole 28, allowing more hydraulic flow, which is beneficial to reducing pressure loss.

[0062] On the second circumferential path (i.e., at the axial position corresponding to the second oil hole 29), second widening portions 111 are provided on the side walls of the working groove 18 and the oil return groove 19. When the second oil hole 29 and the second widening portion 111 are opposite to each other, the second oil hole 29 can communicate with the working groove 18 or the oil return groove 19 through the second widening portion 111 to keep the valve port formed by the second oil hole 29 open. In this way, through the design of the second widening portion 111, the widths of the working groove 18 and the oil return groove 19 on the second circumferential path can be increased, thereby increasing the maximum opening area of the valve port formed by the second oil hole 29, allowing more hydraulic flow, which is beneficial to reducing pressure loss.

[0063] It can be understood that when the valve core 1 and the valve sleeve 2 are in the middle position, both the first oil hole 28 and the second oil hole 29 are located in the area between the working groove 18 and the oil return groove 19, and no widening portions (the first widening portion 112 and the second widening portion 111) are provided in this area. When the valve core 1 and the valve sleeve 2 rotate relative to each other, the first oil hole 28 and the second oil hole 29 first pass through the working groove 18 or the oil return groove 19, and then pass through the first widening portion 112 or the second widening portion 111.

[0064] In a specific embodiment, the first widening portion 112 and the second widening portion 111 are arranged in an arc shape (of course, in other embodiments of the present application, they can also be arranged in a waist shape or other shapes), which can not only improve the structural stability of the working groove 18 and the oil return groove 19, but also facilitate processing and manufacturing. After the first widening portion 112 and the second widening portion 111 are provided on the side walls of the working groove 18 and the oil return groove 19, the central angle range corresponding to the widest part of the working groove 18 and the oil return groove 19 is 25 - 30 degrees.

[0065] In some preferred embodiments, the valve core 1 is provided with a first buffer groove 113 and a second buffer groove 110, which are connected to the oil return groove 19, and the valve sleeve 2 is provided with a first buffer hole 211 and a second buffer hole 210, which are connected to the first oil hole 28 through an annular groove on the valve body 3 and cooperate with the first buffer groove 113 to form a first buffer valve port Adamping, and the second buffer hole 210 and the second oil hole 29 are connected through another annular groove on the valve body 3 and cooperate with the second buffer groove 110 to form a second buffer valve port Adamping. When the valve core 1 is in the middle position, the first buffer groove 113 and the first buffer hole 211 are not connected, and the second buffer groove 110 and the second buffer hole 210 are not connected, when the valve core 1 turns right, the first buffer groove 113 and the first buffer hole 211 are connected, and when the valve core 1 turns left, the second buffer groove 110 and the second buffer hole 210 are connected. During the steering process, the steering actuator is subjected to external force, which will produce impact force on the working oil hole (the working oil hole is the first oil hole 28 when the valve core 1 turns right, and the working oil hole is the second oil hole 29 when the valve core 1 turns left). Through the design of the first buffer valve port Adamping and the second buffer valve port Adamping, part of the oil can be returned to the oil tank, so that the fluctuating pressure on the working oil hole can be buffered and attenuated, reducing the steering jitter phenomenon.

[0066] The first buffer groove 113 and the second buffer groove 110 are arranged to extend in the circumferential direction, so that when the valve core 1 rotates to the right relative to the valve sleeve 2, the first buffer hole 211 and the first buffer groove 113 are always connected, and the connection area remains unchanged; when the valve core 1 rotates to the left relative to the valve sleeve 2, the second buffer hole 210 and the second buffer groove 110 are always connected, and the connection area remains unchanged.

[0067] It should be noted that the first buffer valve port Adamping formed by the cooperation of the first buffer groove 113 and the first buffer hole 211 can be provided with one or more, preferably two or four, corresponding to the positions of the four oil return grooves 19. The second buffer valve port Adamping formed by the cooperation of the second buffer groove 110 and the second buffer hole 210 can be provided with one or more, preferably two or four, corresponding to the positions of the four oil return grooves 19. Moreover, the first buffer valve port Adamping and the second buffer valve port Adamping are not on the first circumferential path and the second circumferential path, thereby avoiding interference with the working valve port A4 and the oil return valve port A5.

[0068] In this solution, each group of first oil holes 28 has a plurality of them arranged with different diameters and misaligned axially and circumferentially, so that each valve port formed by the cooperation of each group of first oil holes 28 and the working groove 18 or the oil return groove 19 has a plurality of first oil holes 28. Specifically, each valve port has three first oil holes 28. By arranging a plurality of first oil holes 28 at each valve port, both the maximum flow area of each valve port can be increased, and the structural strength of the valve port position can be improved. Moreover, since the shape of the first oil hole 28 is set to be circular, the flow area formed by a single first oil hole 28 is not stable when changing with the opening degree (that is, the change rate is slower in the first and last sections and faster in the middle section, and the change curve is close to a sine curve). In this solution, by misaligning a plurality of first oil holes 28 with different diameters axially and circumferentially, the change rates of the first and last sections of any two adjacent first oil holes 28 in the circumferential direction can be superimposed to make up for the problem that the change rate of the first and last sections of a single first oil hole 28 is slow, so that the flow area formed by a plurality of first oil holes 28 changes more smoothly with the opening degree of the valve port. During the steering operation, the flow rate of the valve port changes smoothly, which is beneficial to the precise control of the steering operation.

[0069] Similarly, each group of second oil holes 29 has a plurality of them arranged with different diameters and misaligned axially and circumferentially, so that each valve port formed by the cooperation of each group of second oil holes 29 and the working groove 18 or the oil return groove 19 has a plurality of second oil holes 29

[0070] It should be noted that "different diameters" in this article means that at least two oil holes (the first oil hole 28 or the second oil hole 29) have different diameters. When the number of oil holes is greater than 3, it does not rule out the case where two oil holes have the same diameter; the above-mentioned "axial and circumferential misalignment" means that at least two oil holes are misaligned both axially and circumferentially. When the number of oil holes is greater than 3, it does not rule out the case where two oil holes are only misaligned circumferentially or only misaligned axially. For example, among three oil holes, the first and the third in the circumferential direction can have the same diameter and are not misaligned axially, and the second is different in diameter from the other two and is misaligned both axially and circumferentially.

[0071] In some embodiments, an oil inlet groove 11, a first annular groove 12, an oil distribution groove, a second annular groove 15, a flow amplification groove 16, a third annular groove 17, a working groove 18, and an oil return groove 19 are sequentially arranged along the axial direction of the valve core 1. An oil inlet hole 21, an oil distribution hole 22, a flow amplification hole 27, a first oil hole 28, and a second oil hole 29 are sequentially arranged on the valve sleeve 2 to cooperate to form an oil inlet valve port A1, an oil distribution valve port (including a first oil distribution valve port A2 and a second oil distribution valve port A3, which are respectively communicated with the inlet and outlet of the meter 4), a flow amplification valve port Au, a working valve port A4, and an oil return valve port A5. Here, the flow amplification valve port Au is arranged between the oil distribution valve port and the working valve port A4, so that the oil does not need to pass through the valve core 1 and the valve sleeve 2 before passing through the flow amplification valve port Au, which is beneficial to reducing the pressure loss of the amplified part of the flow and making the amplification ratio more accurate.

[0072] Among them, the oil distribution groove includes a first oil distribution groove 13 and a second oil distribution groove 14. The first oil distribution groove 13 and the second oil distribution groove 14 are arranged in a circumferential staggered manner, so that a second oil distribution groove 14 is arranged between two adjacent first oil distribution grooves 13 in the circumferential direction, and a first oil distribution groove 13 is arranged between two adjacent second oil distribution grooves 14 in the circumferential direction. The first annular groove 12 is communicated with the oil inlet groove 11 and part of the oil distribution grooves (i.e., the first oil distribution groove 13), the second annular groove 15 is communicated with the other part of the oil distribution grooves (i.e., the second oil distribution groove 14) and the flow amplification groove 16, and the third annular groove 17 is communicated with the flow amplification groove 16 and the working groove 18. In this way, through the design of the annular groove, two adjacent valve ports can be communicated on the valve core 1, with a simple structure, balanced oil pressure, and stable and reliable performance.

[0073] As Figure 11 shown, there are four oil inlet grooves 11 on the valve core 1, and four groups of oil inlet holes 21 are arranged on the valve sleeve 2, so that the oil inlet groove 11 is set as a wide groove (i.e., improving the six narrow grooves evenly distributed in the circumferential direction in the prior art to four wide grooves evenly distributed in the circumferential direction), and the oil inlet hole 21 is set as a large hole (i.e., improving the six small holes evenly distributed in the circumferential direction in the prior art to four groups of large holes evenly distributed in the circumferential direction). Furthermore, the opening range of the oil inlet valve port A1 formed by the oil inlet groove 11 and the oil inlet hole 21 is relatively large, and there can be a larger flow-through area, which can reduce the pressure loss under large-flow conditions and reduce the hydraulic noise and vibration generated by the system.

[0074] Among them, each group of oil inlet holes 21 has a plurality of holes with different diameters, which are arranged in a staggered manner along the axial direction and the circumferential direction, so that each group of oil inlet holes 21 and the oil inlet groove 11 cooperate to form an oil inlet valve port A1 with a plurality of oil inlet holes 21. Specifically, each oil inlet valve port A1 has five or six oil inlet holes 21. By arranging a plurality of oil inlet holes 21 in each oil inlet valve port A1, the maximum flow area of each oil inlet valve port A1 can be increased, and the structural strength at the position of the oil inlet valve port A1 can be improved. Moreover, since the shape of the oil inlet hole 21 is set to be circular, the flow area formed by a single oil inlet hole 21 changes unevenly with the opening degree (that is, the change rate in the first and last sections is slower, the change rate in the middle section is faster, and the change curve is close to a sine curve). By staggering a plurality of oil inlet holes 21 with different diameters in the axial and circumferential directions, the change rates of the first and last sections of any two adjacent oil inlet holes 21 in the circumferential direction can be superimposed to make up for the slow change rate of the first and last sections of a single oil inlet hole 21, so that the flow area formed by a plurality of oil inlet holes 21 changes more smoothly with the opening degree of the oil inlet valve port A1. During the steering operation, the flow rate of the oil inlet valve port A1 changes smoothly, which is beneficial to the precise control of the steering operation.

[0075] As Figure 9 shown, there are four flow amplification grooves 16 provided on the spool 1, and four groups of flow amplification holes 27 are provided on the valve sleeve 2, so that the flow amplification grooves 16 are set as wide grooves, and the flow amplification holes 27 are set as large holes. Furthermore, the opening range of the flow amplification valve port Au formed by the flow amplification grooves 16 and the flow amplification holes 27 is larger, and a larger flow area can be obtained, which can reduce the pressure loss under large flow conditions and reduce the hydraulic noise and vibration generated by the system.

[0076] Among them, each group of flow amplification holes 27 has a plurality of holes with different diameters, which are arranged in a staggered manner along the axial direction and the circumferential direction, so that the formed flow amplification valve port Au has a plurality of flow amplification holes 27. Specifically, each flow amplification valve port Au has four flow amplification holes 27. By arranging a plurality of flow amplification holes 27 in each flow amplification valve port Au, the maximum flow area of each flow amplification valve port Au can be increased, and the structural strength at the position of the flow amplification valve port Au can be improved. Moreover, since the shape of the flow amplification hole 27 is set to be circular, the flow area formed by a single flow amplification hole 27 changes unevenly with the opening degree (that is, the change rate in the first and last sections is slower, the change rate in the middle section is faster, and the change curve is close to a sine curve). By staggering a plurality of flow amplification holes 27 with different diameters in the axial and circumferential directions, the change rates of the first and last sections of any two adjacent flow amplification holes 27 in the circumferential direction can be superimposed to make up for the slow change rate of the first and last sections of a single flow amplification hole 27, so that the flow area formed by a plurality of flow amplification holes 27 changes more smoothly with the opening degree of the flow amplification valve port Au. During the steering operation, the flow rate of the flow amplification valve port Au changes smoothly, which is beneficial to the precise control of the steering operation.

[0077] It should be noted that "different diameters" in this article means that at least two adjacent oil holes (oil inlet hole 21, flow amplification hole 27, first oil hole 28 or second oil hole 29) have different diameters. When the number of oil holes is greater than 3, the diameters of two non-adjacent oil holes can be the same, and the situation where two oil holes have the same diameter is not excluded; the above-mentioned "axial and circumferential misalignment" means that at least two adjacent oil holes are misaligned both axially and circumferentially. When the number of oil holes is greater than 3, the situation where two non-adjacent oil holes can be misaligned only circumferentially or only axially is not excluded. For example, among three oil holes, the first and the third in the circumferential direction can have the same diameter and are not misaligned axially, while the second has a different diameter from the other two and is misaligned both axially and circumferentially.

[0078] In some embodiments, as Figure 9 shown, two first oil distribution grooves 13 and two second oil distribution grooves 14 are provided on the spool 1, and the two first oil distribution grooves 13 and the two second oil distribution grooves 14 are arranged staggered in the circumferential direction, so that a second oil distribution groove 14 is arranged between two adjacent first oil distribution grooves 13 in the circumferential direction, and a first oil distribution groove 13 is arranged between two adjacent second oil distribution grooves 14 in the circumferential direction. Four oil distribution holes 22 are arranged on the valve sleeve 2 in the circumferential direction, and the oil distribution holes 22 can respectively cooperate with the first oil distribution groove 13 and the second oil distribution groove 14 to form a first oil distribution valve port A2 and a second oil distribution valve port A3.

[0079] Specifically, the first oil distribution groove 13 and the second oil distribution groove 14 are set as wide grooves corresponding to a central angle range of 65 - 70 degrees. Further, the opening ranges of the formed first oil distribution valve port A2 and second oil distribution valve port A3 are larger, and there can be a larger flow-through area, which can reduce the pressure loss under large-flow conditions and reduce the hydraulic noise and vibration generated by the system.

[0080] Among them, a switching structure is arranged on the outer peripheral surface of the valve sleeve 2, and the oil distribution hole 22 is communicated with the switching structure. When the spool 1 rotates relative to the valve sleeve 2, the oil distribution hole 22 can be communicated with the inlet and outlet of the meter 4 through the switching structure and the flow distribution channel on the valve body 3. Specifically, the oil distribution hole 22 forming the first oil distribution valve port A2 is communicated with the inlet of the meter 4 through the switching structure and the flow distribution channel on the valve body 3, and the oil distribution hole 22 forming the second oil distribution valve port A3 is communicated with the outlet of the meter 4 through the switching structure and the through passage on the valve body 3, so that the oil fluid can enter the meter 4 in sequence through the first oil distribution valve port A2, the switching structure, and the flow distribution channel on the valve body 3, and then flow out of the meter 4 in sequence through the flow distribution channel on the valve body 3, the switching structure, and the second oil distribution valve port A3, thereby completing the metering of the oil fluid flowing through the meter 4.

[0081] As Figure 4 、 5, as shown in FIGS. 9, the switching structure includes a first switching annular groove 23, a second switching annular groove 26, a first switching axial groove 24 and a second switching axial groove 25. Six first switching axial grooves 24 and six second switching axial grooves 25 are provided and arranged in a circumferentially staggered manner, such that there is one second switching axial groove 25 between two adjacent first switching axial grooves 24 in the circumferential direction, and there is one second switching axial groove 25 between two adjacent second switching axial grooves 25 in the circumferential direction. In this way, when the valve sleeve 2 rotates relative to the valve body 3, the first switching axial groove 24 and the second switching axial groove 25 can be sequentially communicated with seven distribution channels on the valve body 3, so that when three distribution channels on the valve body 3 are communicated with the first switching axial groove 24, the other three distribution channels are communicated with the second switching axial groove 25. The first switching annular groove 23 and the second switching annular groove 26 are arranged circumferentially around and axially spaced apart. The first switching axial groove 24 and the second switching axial groove 25 are both axially located between the first switching annular groove 23 and the second switching annular groove 26. The first switching axial groove 24 is communicated with the first switching annular groove 23, and the second switching axial groove 25 is communicated with the second switching annular groove 26. In this way, in the form of the first switching annular groove 23 and the second switching annular groove 26, six first switching axial grooves 24 can be communicated, and six second switching axial grooves 25 can be communicated, and the first switching axial groove 24 and the second switching axial groove 25 are not communicated. The structure is stable and reliable and is convenient for machining.

[0082] Among them, two adjacent oil distribution grooves are respectively arranged in the first switching axial groove 24 and the second switching axial groove 25, so that one of two adjacent oil distribution holes 22 is communicated with three distribution channels on the valve body 3, and the other is communicated with the other three distribution channels on the valve body 3, thereby realizing the inflow and outflow of the oil relative to the meter 4. In this way, through the design of the switching structure, the alternate communication of four oil distribution grooves with seven distribution channels on the valve body 3 can be realized. The structure is simple and reliable and is convenient for machining.

[0083] It should be noted that the above-mentioned first switching annular groove 23, second switching annular groove 26, first switching axial groove 24 and second switching axial groove 25 are all grooves provided on the outer peripheral surface of the valve sleeve 2. Different from the hole, the hole can penetrate the inside and outside of the valve sleeve 2, while the groove cannot penetrate the inside and outside of the valve sleeve 2.

[0084] In some preferred embodiments, a first unloading hole 117 is provided on the spool 1. The first unloading hole 117 is located beside the oil inlet groove 11 and penetrates through the spool 1. A first diversion groove (which can be specifically set as a blind hole) is provided on the inner peripheral surface of the valve sleeve 2. When the spool 1 and the valve sleeve 2 are in the middle position, the first diversion groove communicates the first unloading hole 117 and the oil inlet groove 11 and cooperates to form a first unloading valve port Adrain, so that the oil in the oil inlet groove 11 passes through the first diversion groove and the first unloading hole 117 in sequence, and then returns to the fuel tank through the internal space of the spool 1. In this way, the high-pressure oil at the position of the oil inlet groove 11 can be led out to the fuel tank to form a load sensing circuit.

[0085] It should be noted that an LS oil port and an LS long hole are provided on the valve body, an LS ring groove 212 and a small hole provided in the LS ring groove 212 are provided on the valve sleeve, and the port of the LS long hole is located on the inner peripheral surface of the valve body and is matched and communicated with the LS ring groove 212. When the steering gear is in the middle position and not steering, the oil coming from the LS port of the dynamic priority valve passes through the LS oil port and the LS long hole on the valve body, then through the LS ring groove 212 on the valve sleeve and the small hole in the LS ring groove 212, enters the oil inlet groove of the spool, and finally flows back to the fuel tank through the first diversion groove and the first unloading hole. This path of oil passes through multiple throttling points, forming a certain pressure drop, which balances the spring force of the dynamic priority valve, so that the CF valve port of the dynamic priority valve ensures the flow rate required by the steering gear.

[0086] Wherein, a first wedge-shaped groove 116 is provided on the side wall of the oil inlet groove 11. The first wedge-shaped groove 116 extends axially and extends to the same axial position as the first unloading hole 117. This axial position is opposite to the position of the first diversion groove and is not at the axial position of the oil inlet hole 21, which can avoid interfering with the oil inlet valve port A1 formed by the oil inlet hole 21.

[0087] As Figure 3 、 10 shown, a second unloading hole 115 is provided on the spool 1. The second unloading hole 115 is located beside the second oil distribution groove 14 and penetrates through the spool 1. A second diversion groove (which can be specifically set as a blind hole) is provided on the inner peripheral surface of the valve sleeve 2. When the spool 1 and the valve sleeve 2 are in the middle position, the second diversion groove communicates the second unloading hole 115 and the second oil distribution groove 14 and cooperates to form a second unloading valve port Adrain, so that the oil in the second oil distribution groove 14 passes through the second diversion groove and the second unloading hole 115 in sequence, and then returns to the fuel tank through the internal space of the spool 1. In this way, the internal leakage oil of the steering gear can be led back to the fuel tank, and at the beginning of the steering action, the phenomenon of rotor reverse caused by the high pressure accumulated here can be reduced.

[0088] The side wall of the second oil distribution groove 14 is provided with a second wedge-shaped groove 114. The second wedge-shaped groove 114 extends axially and extends to the same axial position as the second unloading hole 115. This axial position is opposite to the position of the second diversion groove and is not at the axial position of the oil distribution hole 22, which can avoid interfering with the oil inlet valve port A1 formed by the oil distribution hole 22.

[0089] As Figure 2 shown, a static signal groove 118 is provided on the end face of the spool 1 close to the oil inlet groove 11 (oil inlet hole 21). The valve sleeve 2 is provided with a static signal hole. The static signal hole and the oil inlet hole 21 are communicated through an annular groove provided on the valve body 3 or the valve sleeve 2. The positions of the static signal hole and the static signal groove 118 are opposite and cooperate to form a static signal valve port. When the spool 1 and the valve sleeve 2 are in the middle position, the static signal hole and the static signal groove 118 are communicated to guide the oil at the position of the oil inlet hole 21 to the fuel tank through the internal space of the spool 1, so that the steering gear constitutes a static load sensing form. Of course, the valve sleeve 2 may not be provided with a static signal hole, and in this way, the steering gear constitutes a dynamic load sensing form.

[0090] The embodiment of the present application provides a vehicle, including the wide-angle steering gear in the above embodiment. With such a setting, the opening ranges of the working valve port and the oil return valve port are relatively large, and more hydraulic flow can be passed through. Under large-flow working conditions, the pressure loss can be reduced, the hydraulic noise and vibration generated by the system can be reduced, and there is no need to use a flow amplification structure in cooperation, which is beneficial to cost saving.

[0091] In addition, for other beneficial effects brought by this vehicle, please refer to the above description of the wide-angle steering gear and will not be elaborated here.

[0092] The basic principles of the present application have been described above in conjunction with specific embodiments. However, it should be noted that the advantages, advantages, effects, etc. mentioned in the present application are only examples and not limitations. It cannot be considered that these advantages, advantages, effects, etc. are essential for each embodiment of the present application. In addition, the above-disclosed specific details are only for the purposes of illustration and easy understanding, rather than limitations. The above details do not limit the present application to necessarily adopt the above specific details to implement.

[0093] The block diagrams of the devices, apparatuses, equipment, and systems involved in this application are only illustrative examples and are not intended to require or imply that they must be connected, arranged, and configured in the manner shown in the block diagrams. As those skilled in the art will recognize, these devices, apparatuses, equipment, and systems can be connected, arranged, and configured in any manner. Words such as "including", "comprising", "having", etc. are open-ended terms, meaning "including but not limited to", and can be used interchangeably with each other. The words "or" and "and" used herein refer to the phrase "and / or" and can be used interchangeably with it, unless the context clearly indicates otherwise. The word "such as" used herein refers to the phrase "such as but not limited to" and can be used interchangeably with it.

[0094] It should also be noted that in the devices, equipment, and methods of this application, each component or each step can be decomposed and / or recombined. These decompositions and / or recombinations should be regarded as equivalent solutions of this application.

[0095] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use this application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein can be applied to other aspects without departing from the scope of this application. Therefore, this application is not intended to be limited to the aspects shown herein, but rather to the broadest scope consistent with the principles and novel features disclosed herein.

[0096] It should be understood that the qualifiers "first", "second", "third", "fourth", "fifth", and "sixth" used in the description of the embodiments of this application are only used to more clearly elaborate the technical solutions and cannot be used to limit the protection scope of this application.

[0097] The above description has been given for purposes of illustration and description. In addition, this description is not intended to limit the embodiments of this application to the forms disclosed herein. Although multiple example aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, changes, additions, and sub-combinations thereof.

Claims

1. A wide-angle steering gear, characterized in that: It includes a valve body, a valve core and a valve sleeve, and a meter, wherein: The valve body is provided with seven flow distribution channels circumferentially; The valve core is provided with a working groove for delivering oil to the steering actuator and an oil return groove for receiving oil from the steering actuator, and four working grooves and four oil return grooves are provided and staggered in the circumferential direction; The valve sleeve is provided with a first oil hole and a second oil hole, and the first oil hole and the second oil hole are staggered in the circumferential direction so that either one of the first oil hole and the second oil hole can cooperate with the working groove to form a working valve port, and the other can cooperate with the oil return groove to form an oil return valve port.

2. The wide-angle steering gear according to claim 1, characterized in that: The first oil holes and the second oil holes are each provided with four groups, each group of the first oil holes has a plurality of holes with different diameters and arranged in an axial and circumferential staggered manner; each group of the second oil holes has a plurality of holes with different diameters and arranged in an axial and circumferential staggered manner.

3. The wide-angle steering gear according to claim 1, characterized in that: A first widened portion is provided on the side walls of the working groove and the oil return groove at an axial position corresponding to the first oil hole, so that the first oil hole can communicate with the working groove or the oil return groove through the first widened portion; At an axial position corresponding to the second oil hole, a second widened portion is provided on the side walls of the working groove and the oil return groove, so that the second oil hole can communicate with the working groove or the oil return groove through the second widened portion.

4. The wide-angle steering gear according to claim 3, characterized in that: The first widened portion and the second widened portion are configured in an arc shape.

5. The wide-angle steering gear according to claim 3, characterized in that: The central angle of the widest part of the working groove and the oil return groove with the first widened part and the second widened part ranges from 25 to 30 degrees.

6. The wide-angle steering gear according to claim 1, characterized in that: The valve core is provided with an oil inlet groove, a first annular groove, an oil distribution groove for entering and exiting the meter, a second annular groove, a flow amplification groove, a third annular groove, and a working groove in sequence along the axial direction; Wherein, the first annular groove is communicated with the oil inlet groove and a part of the oil distribution groove, the second annular groove is communicated with another part of the oil distribution groove and the flow amplification groove, and the third annular groove is communicated with the flow amplification groove and the working groove.

7. The wide-angle steering gear according to claim 1, characterized in that: The valve core is provided with a plurality of oil inlet grooves along the circumferential direction, and the valve sleeve is provided with a plurality of groups of oil inlet holes along the circumferential direction, which can cooperate with the oil inlet grooves to form an oil inlet valve port; There are four oil inlet grooves and four groups of valve sleeves; and / or each group of oil inlet holes has a plurality of holes with different diameters and arranged in an axial and circumferential staggered manner.

8. The wide-angle steering gear according to claim 1, characterized in that: The valve core is staggeredly provided with two first oil distribution grooves and two second oil distribution grooves along the circumferential direction, and the valve sleeve is provided with four oil distribution holes along the circumferential direction, and the oil distribution holes can cooperate with the first oil distribution groove and the second oil distribution groove to form a first oil distribution valve port and a second oil distribution valve port respectively; Wherein, a switching structure is provided on the outer peripheral surface of the valve sleeve, and the oil distribution hole is communicated with the switching structure, so that the oil distribution hole is communicated with the inlet and outlet of the meter through the switching structure and the distribution channel on the valve body.

9. The wide-angle steering gear according to claim 8, characterized in that: The switching structure comprises a first switching ring groove, a second switching ring groove, a first switching axial groove and a second switching axial groove, six of each of the first switching axial groove and the second switching axial groove are arranged alternately in the circumferential direction, and are located between the first switching ring groove and the second switching ring groove in the axial direction, the first switching axial groove is communicated with the first switching ring groove, and the second switching axial groove is communicated with the second switching ring groove; Wherein, two adjacent oil distribution holes are respectively arranged in the first switching axial groove and the second switching axial groove.

10. The wide-angle steering gear according to claim 8, characterized in that: The first oil distribution groove and the second oil distribution groove are wide grooves with corresponding central angles ranging from 65 to 70 degrees.

11. The wide-angle steering gear according to claim 1, characterized in that: The valve core is provided with a plurality of flow amplification grooves along the circumferential direction; the valve sleeve is provided with a plurality of groups of flow amplification holes along the circumferential direction, which can cooperate with the flow amplification grooves to form a flow amplification valve port, and part of the oil enters the working valve port through the flow amplification valve port without passing through the meter; There are four flow amplification grooves, and four groups of flow amplification holes; and / or each group of flow amplification holes has a plurality of holes with different diameters and staggered in the axial and circumferential directions.

12. The wide-angle steering gear according to claim 8, characterized in that: The valve core is provided with four oil inlet grooves along the circumferential direction, and the valve core is provided with a first unloading hole and a second unloading hole, and the inner wall of the valve sleeve is provided with a first guide groove and a second guide groove. When the valve core and the valve sleeve are in the middle position, the first guide groove is connected with the first unloading hole and the oil inlet groove, and the second guide groove is connected with the second unloading hole and the second oil distribution groove.

13. The wide-angle steering gear according to claim 12, characterized in that: The side wall of the oil inlet groove is provided with a first wedge-shaped groove, and the side wall of the first oil distribution groove is provided with a second wedge-shaped groove, and the first wedge-shaped groove and the second wedge-shaped groove respectively extend axially to the same axial position as the first unloading hole and the second unloading hole.

14. The wide-angle steering gear according to claim 1, characterized in that: The valve core is provided with a first buffer groove and a second buffer groove which are connected with the oil return groove, and the valve sleeve is provided with a first buffer hole and a second buffer hole, and the first buffer hole and the second buffer hole are respectively connected with the first oil hole and the second oil hole through the annular groove on the valve body; when the valve core turns right, the first buffer groove is connected with the first buffer hole, and when the valve core turns left, the second buffer groove is connected with the second buffer hole.

15. The wide-angle steering gear according to claim 14, characterized in that: There are two or four first buffer holes and four first buffer grooves; there are two or four second buffer holes and four second buffer grooves.

16. The wide-angle steering gear according to claim 14, characterized in that: The first buffer groove and the second buffer groove are both extended along the circumferential direction.

17. The wide-angle steering gear according to claim 1, characterized in that: The valve sleeve is provided with an oil inlet hole and a static signal hole for communicating with the oil inlet hole. The end surface of the valve core close to the oil inlet hole is provided with a static signal groove. When the valve core and the valve sleeve are in the middle position, the static signal hole is communicated with the static signal groove.

18. A vehicle, characterized in that: A wide-angle steering device comprising the method described in any one of claims 1 to 17.

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