Valve, drive device, and construction machine

Abstract

The invention relates to a valve, a driving device and a construction machine. The valve is provided with two ports, a valve hole, a check piece and a valve seat. The valve bypasses the reverse pressure on one side of the two ports to the other side by reciprocating the check.

Description

Technical Field

[0001] The invention relates to a valve, a driving device and a construction machine. Background Art

[0002] Generally, the rotation direction and stop of a hydraulic motor are switched by a switching valve. When the switching valve is switched to a neutral position while the hydraulic motor is rotating, the hydraulic motor stops after a braking action. Immediately after the hydraulic motor stops, the hydraulic motor generates a shock due to the swing back. A valve for preventing this shock is proposed. According to the valve, when the switching valve is switched to a neutral position to stop the hydraulic motor, the shock generated by the swing back immediately after the hydraulic motor stops can be prevented.

[0003] Patent Document 1: Japanese Patent Application Laid-Open No. 62-75110

[0004] However, the above-mentioned conventional valve has two check members inside the valve hole formed in the housing, and the two check members need to be assembled from both sides of the valve hole. Therefore, it is difficult to form the valve compactly, for example, it is impossible to ensure a space for installing the valve in the frame of a small hydraulic motor. Therefore, in order to apply the valve to a small hydraulic motor, it is necessary to externally install the valve outside the small hydraulic motor.

[0005] In addition, a flat housing is required for a small hydraulic motor, and compactness of the small hydraulic motor is essential. Summary of the invention

[0006] The present invention provides a driving device and a construction machine capable of integrating a valve into a small hydraulic motor.

[0007] A valve in one embodiment of the present invention comprises: two ports provided in a frame body and allowing a working fluid to flow; a valve hole provided in the frame body and communicating with the two ports; a check member (check) received in the valve hole and freely reciprocating in the direction of the axis of the valve hole; and a valve seat received in the valve hole and separating the two ports and limiting the reciprocating movement of the check member. By reciprocating the check member, the reverse pressure on one side of the two ports is bypassed to the other side.

[0008] The valve seat needs to be formed to have a diameter smaller than the outer diameter of the check member in order to restrict the reciprocating movement of the check member. Therefore, when the valve seat is formed integrally with the frame, two check members need to be assembled into the inside of the valve hole from both sides of the valve seat.

[0009] Therefore, in this structure, the valve seat is accommodated inside the valve hole formed in the frame. Therefore, for example, in a state where the valve seat and the check member are assembled as one body, it is possible to assemble from the opening of the valve hole to the inside of the valve hole. Thus, it is possible to form a valve by providing an opening only on one side of the valve hole. That is, it is not necessary to provide an opening of the valve hole on both sides. As a result, the valve can be formed compactly, and space for providing the valve can be ensured in the frame of the small hydraulic motor. Thus, the valve can be built into the small hydraulic motor.

[0010] In addition, a valve can be built in a flat housing required for a small hydraulic motor.

[0011] Furthermore, by accommodating the valve seat inside the valve hole formed in the frame, it is not necessary to divide the check piece into two and arrange them on both sides of the valve seat. Therefore, the check piece can be integrated into one piece. Thus, the processability of the check piece can be made easier.

[0012] In addition, the valve seat and the check member are assembled inside the valve hole by providing the opening only on one side of the valve hole. Therefore, the processing accuracy of the valve hole can be easily ensured compared with the case where the opening is provided on both sides of the valve hole.

[0013] In the above structure, two housings may be accommodated in the valve hole. The check member may be supported in the two housings so as to be reciprocatable. The valve seat may be arranged so that the two housings are coaxial with the axis and spaced apart by a predetermined distance.

[0014] In the above structure, the valve seat may be formed in an annular shape. An inner flange may be formed on the radial inner side of the valve seat. The inner flange may be arranged at a distance from the inner peripheral surface of the valve hole on the radial inner side and extend from the valve seat in the direction of the axis. The two shells may be embedded and fixed on the outer peripheral surface of the inner flange. A gap connected to the two ports may be formed between the two shells and the frame.

[0015] Another embodiment of the driving device of the present invention comprises: a fluid pump; a fluid motor that works by using the working fluid ejected from the fluid pump; and a valve that is interposed between the fluid pump and the fluid motor and controls the flow of the working fluid between the fluid pump and the fluid motor. The valve comprises: two ports that are provided in the housing of the fluid motor and allow the working fluid to flow; a valve hole that is provided in the housing and communicates with the two ports; a check member that is accommodated in the interior of the valve hole and can freely reciprocate in the direction of the axis of the valve hole; and a valve seat that is accommodated in the interior of the valve hole and separates the two ports and limits the reciprocating movement of the check member. By reciprocating the check member, the reverse pressure on one side of the two ports is bypassed to the other side.

[0016] By configuring in this way, the valve can be formed compactly, and a space for installing the valve can be ensured in the housing of the small hydraulic motor. Thus, a drive device having a small hydraulic motor with a built-in valve can be provided.

[0017] In addition, it is possible to provide a drive device in which a valve is built in a flat housing required for a small hydraulic motor.

[0018] A construction machine in another embodiment of the present invention comprises: a vehicle body; and a drive device, which is arranged on the vehicle body and used to drive the vehicle body. The drive device comprises: a fluid pump; a fluid motor, which works by using the working fluid ejected from the fluid pump; and a valve, which is interposed between the fluid pump and the fluid motor and controls the flow of the working fluid between the fluid pump and the fluid motor. The valve comprises: two ports, which are arranged on the housing of the fluid motor and allow the working fluid to flow; a valve hole, which is arranged on the housing and communicates with the two ports; a check member, which is accommodated inside the valve hole and can freely reciprocate in the direction of the axis of the valve hole; and a valve seat, which is accommodated inside the valve hole and separates the two ports, and limits the reciprocating movement of the check member. By reciprocating the check member, the reverse pressure on one side of the two ports is bypassed to the other side.

[0019] By configuring in this way, the valve can be formed compactly, and a space for installing the valve can be ensured in the housing. Thus, a construction machine having a small hydraulic motor with a built-in valve can be provided.

[0020] In addition, it is possible to provide a construction machine in which a valve is built in a flat housing required for a small hydraulic motor.

[0021] According to the aspect of the present invention, the valve can be built into the small hydraulic motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic structural diagram of a construction machine according to an embodiment of the present invention.

[0023] Figure 2 This is a hydraulic circuit diagram of a drive device according to an embodiment of the present invention.

[0024] Figure 3 It is a cross-sectional view of the anti-reverse valve according to the embodiment of the present invention.

[0025] Description of Reference Numerals

[0026] 1: driving device; 5: anti-reversal valve (valve); 10: outer casing (frame); 11: valve hole; 11a: inner circumferential surface of the valve hole; 12a, 12b: first port (one of the two ports); 13a, 13b: second port (the other of the two ports); 20: valve seat; 22: first shell (one of the two shells); 23: second shell (the other of the two shells); 25: check member; 28: first inner flange (inner flange); 29: second inner flange (inner flange); 35: first gap (gap); 55: second gap (gap); 100: construction machinery; 101: rotating body (vehicle body); A: axis. DETAILED DESCRIPTION

[0027] Next, a valve, a drive device, and a construction machine according to an embodiment of the present invention will be described with reference to the drawings.

[0028] <Construction machinery>

[0029] Figure 1 It is a schematic structural diagram of a construction machine according to an embodiment.

[0030] like Figure 1 As shown, the construction machine 100 is, for example, a hydraulic excavator, etc. The construction machine 100 includes a revolving body (an example of a vehicle body in the claims) 101, a traveling body 102 provided below the revolving body 101, and a drive device 1 for driving the revolving body 101 and the traveling body 102.

[0031] The revolving body 101 revolves relative to the traveling body 102. The revolving body 101 has a cab 103, a boom 104 having one end connected to the cab 103, an arm 105 having one end connected to the other end of the boom 104, and a bucket 106 connected to the other end of the arm 105. The cab 103 supports an operator riding on the revolving body 101. The boom 104 swings relative to the main body of the revolving body 101. The arm 105 swings relative to the boom 104. The bucket 106 swings relative to the arm 105. That is, the boom 104, the arm 105, and the bucket 106 constitute a working device of the construction machine 100.

[0032] <Drive device>

[0033] The driving device 1 is mainly provided in the swing body 101. The swing body 101, the traveling body 102, the boom 104, the arm 105, and the bucket 106 are driven by hydraulic oil (an example of the working fluid in the claims) supplied from the driving device 1.

[0034] Figure 2 It is a hydraulic circuit diagram of the drive device according to the embodiment.

[0035] like Figure 1 , Figure 2As shown, the drive device 1 includes a hydraulic pump 2, a switching valve (control valve) 3, a hydraulic motor (an example of a motor in the claims) 4, and a reverse anti-reverse valve (an example of a valve in the claims) 5. The hydraulic pump 2 is a driving source. The switching valve 3 switches the flow of the working oil ejected from the hydraulic pump 2. The hydraulic motor 4 is operated by the working oil ejected from the hydraulic pump 2. The reverse anti-reverse valve 5 is interposed between the hydraulic motor 4 and the switching valve 3.

[0036] In the present embodiment, a small hydraulic motor is described as an example of the hydraulic motor 4, but a large hydraulic motor may be used as the hydraulic motor 4. Hereinafter, the hydraulic motor 4 may be referred to as a "small hydraulic motor 4".

[0037] The switching valve 3 can return the hydraulic oil discharged from the hydraulic pump 2 to the tank 6 by arranging the valve element 3a at the neutral position P1. The hydraulic oil can be introduced into the first flow path 7 by arranging the valve element 3a at the first rotation position P2. The hydraulic oil can be introduced into the second flow path 8 by arranging the valve element 3a at the second rotation position P3.

[0038] The reverse flow prevention valve 5 is provided in the middle of the first flow path 7 and the second flow path 8 connecting the switching valve 3 and the hydraulic motor 4. The reverse flow prevention valve 5 will be described in detail below.

[0039] <Anti-reverse valve>

[0040] Figure 3 It is a cross-sectional view of the anti-reverse valve according to the embodiment.

[0041] like Figure 2 , Figure 3 As shown, the reverse anti-reverse valve 5 is built into the housing (an example of the housing in the claims) 10 of the hydraulic motor 4 as a frame (an example of the frame in the claims). The reverse anti-reverse valve 5 has a valve hole (an example of the valve hole in the claims) 11, first ports (an example of one of the two ports in the claims) 12a, 12b, and second ports (an example of the other of the two ports in the claims) 13a, 13b. The valve hole 11 is provided in the housing 10. The first ports 12a, 12b are connected to the valve hole 11. The second ports 13a, 13b are connected to the valve hole 11.

[0042] The valve hole 11 is, for example, on one side of the housing 10 ( Figure 3 The valve hole 11 is formed into a circular shape when viewed from one side of the housing 10. The other side of the valve hole 11 in the direction of the axis A is closed by the wall 15 of the housing 10. One side of the valve hole 11 is blocked by the plug 84.

[0043] Hereinafter, the direction of the axis A of the valve hole 11 is simply referred to as the "axis A direction". The opening 14 side (one side) of the valve hole 11 is referred to as the "first direction side", and the wall 15 side (the other side) of the valve hole 11 is referred to as the "second direction side".

[0044] The first port 12a and the second port 13a are located on the first direction side in the axis A direction. The first port 12a and the second port 13a communicate with the first flow path 7. The first port 12b and the second port 13b are located on the second direction side in the axis A direction. The first port 12b and the second port 13b communicate with the second flow path 8.

[0045] A valve seat (an example of a valve seat in the claims) 20, two housings (an example of a housing in the claims) 22, 23, and a check member (an example of a check member in the claims) 25 are housed inside the valve hole 11. The housings 22, 23 are arranged on both sides of the valve seat 20. The check member 25 is arranged inside the two housings 22, 23.

[0046] The valve seat 20 is formed in an annular shape, for example. The valve seat 20 is accommodated inside the valve hole 11. The valve seat 20 is arranged approximately in the center in the direction of the axis A. The outer peripheral surface 20a of the valve seat 20 contacts the inner peripheral surface 11a (an example of the inner peripheral surface in the claims) of the valve hole 11. The groove portion 26 is formed in an annular shape on the outer peripheral surface 20a of the valve seat 20. An O-ring 27 is accommodated in the groove portion 26. The O-ring 27 seals between the two shells 22 and 23 arranged on both sides of the valve seat 20. That is, the valve seat 20 separates the first port 12a located on the first direction side and the first port 12b located on the second direction side. The valve seat 20 separates the second port 13a located on the first side and the second port 13b located on the second direction side.

[0047] Two inner flanges (an example of the inner flange in the claims) 28, 29 formed in an annular shape are formed on the radial inner side of the valve seat 20. The two inner flanges 28, 29 are provided at intervals on the radial inner side relative to the inner peripheral surface 11a of the valve hole 11. The two inner flanges 28, 29 extend from the valve seat 20 in the direction of the axis A. The two inner flanges 28, 29 restrict the reciprocating movement of the check member 25 described later.

[0048] In the following description, the inner flange 28 of the two inner flanges 28 and 29 that protrudes in the first direction is referred to as a first inner flange 28 . The inner flange 29 of the two inner flanges 28 and 29 that protrudes in the second direction is referred to as a second inner flange 29 .

[0049] The two housings 22 and 23 are formed into bottomed cylindrical shapes having first openings 32 and 52 on the valve seat 20 side, respectively. The two housings 22 and 23 are arranged coaxially with the axis A. In the following description, the housing of the two housings 22 and 23 that is arranged in the first direction across the valve seat 20 is referred to as the first housing 22. The housing of the two housings 22 and 23 that is arranged in the second direction across the valve seat 20 is referred to as the second housing 23. The first housing 22 has a first opening 32. The second housing 23 has a first opening 52.

[0050] The portion of the first housing 22 having the outer peripheral surface 22a is formed to have a smaller diameter than the portion of the valve hole 11 having the inner peripheral surface 11a. A second opening portion 33 having an inner diameter smaller than that of the first opening portion 32 is formed at the bottom portion 22b of the first housing 22. The second opening portion 33 is provided coaxially with the axis A. The second opening portion 33 allows the inside and outside of the bottom portion 22b to communicate in the direction of the axis A.

[0051] A plurality of first small holes 88 are formed in the peripheral wall portion 22d of the first housing 22 so as to pass through the peripheral wall portion 22d in the radial direction. The first small holes 88 allow the radial inside and the radial outside of the peripheral wall portion 22d to communicate with each other.

[0052] A plurality of second small holes 86 penetrating in the radial direction are formed in the bottom portion 22b of the first housing 22. The second small holes 86 allow the outer peripheral surface 22a and the second opening 33 to communicate with each other.

[0053] The first housing 22 is fixed by fitting the end 22c on the first opening 32 side with the radially outer side of the first inner flange 28. The end 22c of the first housing 22 contacts the wall surface 20b on the first direction side of the valve seat 20. In this state, an annular first gap (an example of a gap in the claims) 35 is formed between the outer peripheral surface 22a of the first housing 22 and the inner peripheral surface 11a of the valve hole 11. The first gap 35 is connected to the first port 12a and the second port 13a. Therefore, the working oil flowing through the first flow path 7 flows through the first port 12a, the second port 13a and the first gap 35.

[0054] A disc-shaped first seat portion 42 is housed inside the first housing 22. The first seat portion 42 is configured to contact the bottom portion 22b. An opening portion 42a is formed on the first seat portion 42. The opening portion 42a is formed coaxially with the axis A. The inner diameter of the opening portion 42a is smaller than the inner diameter of the second opening portion 33. The second opening portion 33 and the interior of the first housing 22 are connected via the opening portion 42a of the first seat portion 42.

[0055] The first lifting member 37 is accommodated in the second opening portion 33 of the first housing 22 so as to be movable in the direction of the axis A. The first lifting member 37 is formed in a bottomed cylindrical shape having a third opening portion 38 on the first direction side. A small hole 87 is formed in the bottom 37a of the first lifting member 37. The small hole 87 connects the inside and the outside of the bottom 37a in the direction of the axis A. The small hole 87 is arranged coaxially with the axis A.

[0056] A first compression spring 39 is accommodated inside the first poppet 37. The first compression spring 39 is compressed between the bottom 37a of the first poppet 37 and the plug 84. The bottom 37a of the first poppet 37 is pressed against the first seat 42 by the restoring force of the first compression spring 39. The first poppet 37 and the first compression spring 39 constitute a first flow rate regulating valve.

[0057] The structure of the second housing 23 is also the same as that of the first housing 22. The second housing 23 is formed symmetrically with respect to the first housing 22 with the valve seat 20 as the center.

[0058] That is, the portion of the second housing 23 having the outer peripheral surface 23a is formed to have a smaller diameter than the portion of the valve hole 11 having the inner peripheral surface 11a. A second opening 53 having an inner diameter smaller than that of the first opening 52 is formed at the bottom 23b of the second housing 23. The second opening 53 is provided coaxially with the axis A. The second opening 53 allows the inside and outside of the bottom 23b to communicate in the direction of the axis A.

[0059] A plurality of first small holes 94 penetrating in the radial direction are formed in the peripheral wall portion 23d of the second housing 23. The first small holes 94 allow the radial inside and the radial outside of the peripheral wall portion 23d to communicate with each other.

[0060] A plurality of second small holes 92 penetrating in the radial direction are formed in the bottom portion 23 b of the second housing 23. The second small holes 92 allow the outer peripheral surface 23 a and the second opening 53 to communicate with each other.

[0061] The second housing 23 is fixed by fitting the end 23c on the side of the first opening 52 with the radially outer side of the second inner flange 29. The end 23c of the second housing 23 contacts the wall surface 20c on the second direction side of the valve seat 20. In this state, an annular second gap (an example of a gap in the claims) 55 is formed between the outer peripheral surface 23a of the second housing 23 and the inner peripheral surface 11a of the valve hole 11. The second gap 55 is separated from the first gap 35 by the O-ring 27 of the valve seat 20. The second gap 55 is connected to the first port 12b and the second port 13b. Therefore, the working oil flowing through the second flow path 8 circulates in the first port 12b, the second port 13b and the second gap 55.

[0062] A disc-shaped second seat portion 62 is housed inside the second housing 23. The second seat portion 62 is configured to contact the bottom portion 23b. An opening portion 62a is formed in the second seat portion 62. The opening portion 62a is formed coaxially with the axis A. The inner diameter of the opening portion 62a is smaller than the inner diameter of the second opening portion 53. The second opening portion 53 is connected to the interior of the second housing 23 via the opening portion 62a of the second seat portion 62.

[0063] The second lifting member 57 is accommodated in the second opening 53 of the second housing 23 so as to be movable in the direction of the axis A. The second lifting member 57 is formed in a bottomed cylindrical shape having a third opening 58 on the second direction side. A small hole 93 is formed in the bottom 57a of the second lifting member 57. The small hole 93 connects the inside and the outside of the bottom 57a in the direction of the axis A. The small hole 87 is provided coaxially with the axis A.

[0064] A second compression spring 59 is accommodated inside the second lift member 57. The second compression spring 59 is compressed between the bottom 57a of the second lift member 57 and the wall 15 of the housing 10. The bottom 57a of the second lift member 57 is pressed against the second seat 62 by the restoring force of the second compression spring 59. The second lift member 57 and the second compression spring 59 constitute a second flow rate regulating valve.

[0065] The check member 25 is supported by the inner circumferential surfaces of the two shells 22 and 23. The check member 25 has two ends (two ends) and a middle portion. The middle portion is located between the two ends. The diameter of each of the two ends is larger than the diameter of the middle portion. That is, the two ends are large diameter portions. The middle portion is a small diameter portion. Specifically, the check member 25 has a first diameter expansion portion 71, a first inclined portion 72, a second diameter expansion portion 73, a second inclined portion 74 and a middle portion 75. The first diameter expansion portion 71 is located on the first direction side. The first inclined portion 72 is formed integrally with the first diameter expansion portion 71. The second diameter expansion portion 73 is located on the second direction side. The second inclined portion 74 is formed integrally with the second diameter expansion portion 73. The middle portion 75 connects the first inclined portion 72 and the second inclined portion 74. The first diameter expansion portion 71, the first inclined portion 72, the middle portion 75, the second inclined portion 74 and the second diameter expansion portion 73 are formed integrally on the same axis.

[0066] The first enlarged diameter portion 71 is formed to have an outer diameter slightly smaller than the inner diameter of the first housing 22. The first enlarged diameter portion 71 is formed to have a larger diameter than the first inner flange 28. Therefore, the first enlarged diameter portion 71 is supported in the first housing 22 to be reciprocatable in the direction of the axis A on the first direction side relative to the first inner flange 28. A first recess 77 is formed on the end surface 71a on the first direction side of the first enlarged diameter portion 71. The first recess 77 is formed in a circular shape when viewed from the direction of the axis A. The first recess 77 is coaxially arranged with the axis A.

[0067] The first inclined portion 72 is formed in a conical trapezoidal shape in which the diameter of the first inclined portion 72 decreases in the direction from the first enlarged diameter portion 71 toward the intermediate portion 75 .

[0068] The second enlarged diameter portion 73 is formed to have an outer diameter slightly smaller than the inner diameter of the second housing 23. The second enlarged diameter portion 73 is formed to have a larger diameter than the second inner flange 29. Therefore, the second enlarged diameter portion 73 is supported in the second housing 23 to be reciprocatingly movable in the direction of the axis A on the second direction side of the second inner flange 29. A second recess 78 is formed on the end surface 73a on the second direction side of the second enlarged diameter portion 73. The second recess 78 is formed in a circular shape when viewed from the direction of the axis A. The second recess 78 is coaxially arranged with the axis A.

[0069] The second inclined portion 74 is formed in a conical trapezoidal shape in which the diameter of the second inclined portion 74 decreases in the direction from the second enlarged diameter portion 73 toward the intermediate portion 75 .

[0070] The intermediate portion 75 integrally connects the first inclined portion 72 and the second inclined portion 74. The intermediate portion 75 is formed to have an outer diameter smaller than the inner diameters of the first inner flange 28 and the second inner flange 29.

[0071] A third compression spring 81 in a compressed state is provided between the first recessed portion 77 of the check member 25 and the first seat portion 42. A first back chamber V1 is formed between the first enlarged diameter portion 71 of the check member 25 and the first seat portion 42. The function of the first back chamber V1 will be described later.

[0072] A fourth compression spring 82 in a compressed state is provided between the second recessed portion 78 of the check member 25 and the second seat portion 62. A second back chamber V2 is formed between the second enlarged diameter portion 73 of the check member 25 and the second seat portion 62. The function of the second back chamber V2 will be described later.

[0073] When the check member 25 moves, for example, in the second direction, the first inclined portion 72 abuts against the first inner flange 28 of the valve seat 20. Thus, the movement of the check member 25 in the second direction is restricted. In addition, when the check member 25 moves, for example, in the first direction, the second inclined portion 74 abuts against the second inner flange 29 of the valve seat 20. Thus, the movement of the check member 25 in the first direction is restricted. That is, the reciprocating movement of the check member 25 is restricted by the valve seat 20.

[0074] The anti-reverse valve 5 thus constructed can be assembled from the opening 14 of the valve hole 11 into the interior of the valve hole 11, for example, in a state where the valve seat 20, the check member 25, and the two housings 22, 23, etc. are assembled into one body. After the valve seat 20, the check member 25, and the two housings 22, 23, etc., which are assembled into one body, are assembled from the opening 14 into the interior of the valve hole 11, the opening 14 is blocked by the plug 84.

[0075] In the no-load state, the check member 25 is arranged in a neutral position by the compression springs 81, 82. The neutral position of the check member 25 refers to a position where the center between the first housing 22 and the second housing 23 (the center in the direction of the axis A of the valve seat 20) and the center in the direction of the axis A of the check member 25 coincide with each other.

[0076] <Operation of the reverse prevention valve>

[0077] Next, based on Figure 2 , Figure 3 An example in which the anti-reverse valve 5 is used to prevent the shock caused by the swing of the hydraulic motor 4 will be described.

[0078] Generally, the rotation direction and stop of the hydraulic motor 4 are switched by the switching valve 3. When the switching valve 3 is switched to the neutral position P1 while the hydraulic motor 4 is rotating, the rotating body 101 is decelerated to stop after the brake is applied. While the rotating body 101 is decelerating, the rotating body 101 continues to rotate due to the inertia force during the rotation.

[0079] Therefore, the hydraulic motor 4 functions as a pump. In this state, brake pressure is generated at the discharge port of the hydraulic motor 4. Hereinafter, the discharge port that generates brake pressure is described as, for example, the second port 13a. In this case, the hydraulic oil is introduced from the hydraulic motor 4 to the first gap 35 via the first flow path 7 and the second port 13a. The hydraulic oil introduced into the first gap 35 flows from the second small hole 86 of the first housing 22 to the first back chamber V1 of the check member 25 via the small hole 87 of the first lift member 37.

[0080] Due to the hydraulic oil flowing into the first back chamber V1, the check member 25 moves to the second direction side in the direction of the axis A. After the check member 25 moves, the first inclined portion 72 of the check member 25 abuts against the first inner flange 28, and the movement of the check member 25 to the second direction side stops. In the state where the movement of the check member 25 stops, the bypass passage that communicates with the intermediate chamber U through the passage W1 from the first small hole 88 of the first housing 22 is blocked. Then, the rotating body 101 is temporarily stopped.

[0081] The rotating body 101 reverses due to the brake pressure just after being temporarily stopped. Therefore, the pressure of the working oil in the second flow path 8 rises. As a result, the working oil is introduced from the hydraulic motor 4 into the second gap 55 via the second flow path 8 and the second port 13b. The working oil introduced into the second gap 55 flows from the second small hole 92 of the second housing 23 through the small hole 93 of the second lifting member 57 into the second back chamber V2 of the check member 25. Due to the working oil flowing into the second back chamber V2, the check member 25 intends to move toward the first direction side in the direction of the axis A.

[0082] At this time, the working oil in the first back chamber V1 of the check member 25 flows out slowly under the action of the first flow regulating valve composed of the first lifting member 37 and the first compression spring 39. Therefore, the movement of the check member 25 to the first direction side is slightly delayed. During this period, the working oil of the second port 13b flows from the first small hole 94 of the second housing 23 to the intermediate chamber U through the passage W2, and bypasses to the second port 13a side through the first small hole 88 of the first housing 22. Then, the first small hole 94 of the bypass passage is moved to a position blocked by the second enlarged diameter portion 73, and the second inclined portion 74 abuts against the second inner flange 29.

[0083] In this way, during the process of the hydraulic motor 4 generating the reverse pressure on the second port 13b side, the reverse pressure generated on the second port 13b side can be bypassed to the second port 13a side by reciprocating the check member 25 in the direction of the axis A. Therefore, the reverse rotation can be prevented without sealing the hydraulic oil. Thus, when the switching valve 3 is switched to the neutral position P1 to stop the hydraulic motor 4, the shock caused by the swinging of the hydraulic motor 4 immediately after the hydraulic motor 4 stops can be prevented.

[0084] As described above, in the anti-reverse valve 5, the valve seat 20 is housed inside the valve hole 11 formed in the housing 10. Therefore, for example, in a state where the valve seat 20, the check member 25, and the two housings 22, 23 are assembled as one body, the valve seat 20 can be assembled into the inside of the valve hole 11 from the opening 14. Thus, the anti-reverse valve 5 can be formed by providing the opening 14 on only one side of the valve hole 11 without providing the opening 14 of the valve hole 11 on both sides.

[0085] As a result, the reverse rotation prevention valve 5 can be formed compactly, and a space for installing the reverse rotation prevention valve 5 can be ensured in the housing 10 of the small hydraulic motor 4. Therefore, the reverse rotation prevention valve 5 can be built in the housing 10 of the small hydraulic motor 4.

[0086] Furthermore, the anti-reverse valve 5 can be built in the flat housing 10 required for the small hydraulic motor 4 .

[0087] Furthermore, by accommodating the valve seat 20 inside the valve hole 11 formed in the housing 10, it is not necessary to divide the check member 25 into two and arrange them on both sides of the valve seat 20. Therefore, the check member 25 can be integrated into one body. Thus, the processability of the check member 25 can be made easy.

[0088] In addition, the valve seat 20, the check member 25, and the two housings 22 and 23 are assembled into the valve hole 11 by providing the opening 14 only on one side of the valve hole 11. Thus, the machining accuracy of the valve hole 11 can be easily ensured compared with the case where the opening is provided on both sides of the valve hole 11.

[0089] In addition, by assembling the valve seat 20, the check member 25, and the two housings 22, 23 into the valve hole 11 in a state where the valve seat 20, the check member 25, and the two housings 22, 23 are assembled into one body, the two housings 22, 23 can be arranged at a predetermined interval on both sides of the coaxial valve seat 20. Thus, it is not necessary to provide openings on both sides of the valve hole 11 to receive the two housings 22, 23 from the openings on both sides. Thus, the anti-reverse valve 5 can be formed compactly.

[0090] Furthermore, by fitting and fixing the first housing 22 with the first inner flange 28, the first gap 35 connected to the first port 12a and the second port 13a is formed between the first housing 22 and the inner peripheral surface 11a of the valve hole 11. In addition, by fitting and fixing the second housing 23 with the second inner flange 29, the second gap 55 connected to the first port 12b and the second port 13b is formed between the second housing 23 and the inner peripheral surface 11a of the valve hole 11. Thus, the first gap 35 connected to the first port 12a and the second port 13a and the second gap 55 connected to the first port 12b and the second port 13b can be easily formed.

[0091] Furthermore, by fitting and fixing the first housing 22 with the first inner flange 28 and fitting and fixing the second housing 23 with the second inner flange 29, the first gap 35 and the second gap 55 can be formed by the valve seat 20. Thus, the shapes of the first housing 22 and the second housing 23 can be simplified, and the workability of the first housing 22 and the second housing 23 can be made easier.

[0092] Furthermore, according to the drive device 1, the anti-reverse valve 5 is formed compactly, so that a space for installing the anti-reverse valve 5 can be ensured in the housing 10 of the small hydraulic motor 4. Thus, the drive device 1 having the small hydraulic motor 4 with the anti-reverse valve 5 built therein can be provided.

[0093] In addition, it is possible to provide the drive device 1 in which the anti-reverse valve 5 is built in the flat housing required for the small hydraulic motor 4 .

[0094] Furthermore, according to the construction machine 100, by forming the anti-reverse valve 5 compactly, a space for installing the anti-reverse valve 5 can be ensured in the housing 10 of the small hydraulic motor 4. Thus, the construction machine 100 having the small hydraulic motor 4 with the anti-reverse valve 5 built therein can be provided.

[0095] Furthermore, it is possible to provide a construction machine 100 in which the anti-reverse valve 5 is built in a flat housing required for a small hydraulic motor 4 .

[0096] Furthermore, by forming the anti-reverse valve 5 compactly, the anti-reverse valve 5 can be mounted even in a narrow space of the construction machine 100. Thus, the piping layout of the construction machine 100 can be facilitated.

[0097] The technical scope of the present invention is not limited to the above-mentioned embodiment. Various changes can be added to the technical scope of the present invention without departing from the gist of the present invention.

[0098] For example, in the above embodiment, a hydraulic excavator having a swing body 101, a boom 104, an arm 105, and a bucket 106 is described as an example of the construction machine 100. However, the present invention is not limited to such a structure and can be applied to other construction machines and the like.

[0099] In the above embodiment, a small hydraulic motor is used as an example of the hydraulic motor 4. However, the present invention is not limited to such a structure. As an example of other hydraulic motors, the mechanism of the above embodiment can also be applied to a large hydraulic motor or the like.

[0100] In the above embodiment, working oil is exemplified as the working fluid. However, the present invention is not limited to working oil. The present invention can also be applied to working fluids other than working oil. The working fluid is not limited to liquid. The working fluid can also be gas.

[0101] In the above embodiment, the case where the housing 10 of the hydraulic motor 4 is used as the frame of the anti-reverse valve 5 is described. However, the present invention is not limited to such a structure. The frame of the anti-reverse valve 5 may be provided separately from the housing 10 .

[0102] Furthermore, the components of the above-described embodiment may be replaced with known components without departing from the spirit of the present invention.

[0103] The components composed of a plurality of objects in the embodiments disclosed in this specification may be integrated into the plurality of objects, or conversely, a component composed of one object may be divided into a plurality of objects. Regardless of whether they are integrated or not, they may be constructed so as to achieve the purpose of the invention.

Claims

1. A valve, wherein: have: two ports, disposed on the frame and allowing the working fluid to flow; a valve hole, disposed in the frame and communicating with the two ports; A check member is received in the valve hole and is reciprocatingly movable in the direction of the axis of the valve hole; as well as a valve seat received in the valve hole and separating the two ports and limiting the reciprocating movement of the check member; By reciprocating the check member, reverse pressure on one side of the two ports is bypassed to the other side.

2. The valve according to claim 1, wherein: having two housings received in the valve hole, The check member is supported inside the two housings so as to be reciprocatable. The valve seat is arranged such that the two housings are coaxial with the axis and spaced a predetermined distance apart.

3. The valve according to claim 2, wherein: The valve seat is formed in a ring shape, An inner flange is formed on the radial inner side of the valve seat. The inner flange is arranged at a distance from the inner peripheral surface of the valve hole in the radial direction and extends from the valve seat in the direction of the axis. The two shells are embedded and fixed on the outer peripheral surface of the inner flange. A gap connected to the two ports is formed between the two shells and the frame.

4. A driving device, wherein: have: Fluid pumps; a fluid motor that operates using the working fluid ejected from the fluid pump; and a valve, interposed between the fluid pump and the fluid motor, and controlling the flow of the working fluid between the fluid pump and the fluid motor; The valve has: two ports, disposed on the housing of the fluid motor and allowing the working fluid to flow; a valve hole, disposed in the housing and communicating with the two ports; A check member is received in the valve hole and is reciprocatingly movable in the direction of the axis of the valve hole; as well as a valve seat received in the valve hole and separating the two ports and limiting the reciprocating movement of the check member; By reciprocating the check member, reverse pressure on one side of the two ports is bypassed to the other side.

5. A construction machine, wherein: have: Vehicle body; and A driving device, disposed on the vehicle body and used to drive the vehicle body; The driving device comprises: Fluid pumps; a fluid motor that operates using the working fluid ejected from the fluid pump; and a valve, interposed between the fluid pump and the fluid motor, and controlling the flow of the working fluid between the fluid pump and the fluid motor; The valve has: two ports, disposed on the housing of the fluid motor and allowing the working fluid to flow; a valve hole, disposed in the housing and communicating with the two ports; A check member is received in the valve hole and is reciprocatingly movable in the direction of the axis of the valve hole; as well as a valve seat received in the valve hole and separating the two ports and limiting the reciprocating movement of the check member; By reciprocating the check member, reverse pressure on one side of the two ports is bypassed to the other side.

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