Pump unit and construction machine
阅读说明:本技术 泵单元和施工机械 (Pump unit and construction machine ) 是由 赤见俊也 山口祥 于 2020-02-28 设计创作,主要内容包括:本发明提供一种泵单元和施工机械。本发明的泵单元具备:第1泵,其具有:第1壳体;旋转轴,其以可旋转的方式设置于所述第1壳体;壁面部,其位于所述旋转轴的轴线上且位于所述第1壳体的一侧;第1吸入部和第1排出部,其形成于所述第1壳体的所述壁面部;凸部,其设置于所述第1吸入部和所述第1排出部中的至少任一者的内侧面部;以及固定用孔部,其从所述壁面部的外表面朝向所述凸部地形成;和第2泵,其通过将固定构件安装于所述固定用孔部而固定于所述壁面部的所述外表面。(The invention provides a pump unit and a construction machine. The pump unit of the present invention includes: a 1 st pump having: 1, a first shell; a rotating shaft rotatably provided to the 1 st housing; a wall surface portion located on an axis of the rotation shaft and located on one side of the 1 st housing; a 1 st suction part and a 1 st discharge part formed on the wall surface part of the 1 st housing; a convex portion provided on an inner side surface portion of at least one of the 1 st suction portion and the 1 st discharge portion; and a fixing hole formed from an outer surface of the wall surface portion toward the convex portion; and a 2 nd pump fixed to the outer surface of the wall surface portion by attaching a fixing member to the fixing hole portion.)
1. A pump unit is provided with:
a 1 st pump having: 1, a first shell; a rotating shaft rotatably provided in the 1 st housing; a wall surface portion located on an axis of the rotation shaft and located on one side of the 1 st housing; a 1 st suction part and a 1 st discharge part formed on the wall surface part of the 1 st housing; a convex portion provided on an inner side surface portion of at least one of the 1 st suction portion and the 1 st discharge portion; and a fixing hole formed from an outer surface of the wall surface portion toward the convex portion; and
and a 2 nd pump fixed to the outer surface of the wall surface portion by attaching a fixing member to the fixing hole portion.
2. The pump unit of claim 1,
the convex portion is disposed at the center in the width direction orthogonal to the flow direction of the fluid flowing through the 1 st suction portion and the 1 st discharge portion.
3. Pump unit according to claim 1 or 2,
the 2 nd pump includes:
a 2 nd housing;
a 2 nd suction unit formed on a 1 st wall surface portion of the 2 nd casing and configured to suck liquid into the 2 nd casing; and
a 2 nd discharge portion formed on a 2 nd wall surface portion of the 2 nd casing for discharging liquid to the outside of the 2 nd casing,
a side surface portion of the 1 st casing in which the discharge port portion of the 1 st discharge portion is formed faces the 2 nd wall surface portion of the 2 nd casing in the same direction.
4. The pump unit of claim 3,
the 1 st suction part of the 1 st pump communicates with the 2 nd suction part of the 2 nd pump.
5. Pump unit according to claim 1 or 2,
the convex portion becomes tapered as going toward the projecting direction.
6. Pump unit according to claim 1 or 2,
the convex part is an elliptical cone, and the convex part is an elliptical cone,
the long axis of the projection is along the flow direction of the fluid flowing through the 1 st suction part and the 1 st discharge part.
7. The pump unit of claim 5,
the convex part is an elliptical cone, and the convex part is an elliptical cone,
the long axis of the projection is along the flow direction of the fluid flowing through the 1 st suction part and the 1 st discharge part.
8. A pump unit is provided with:
a 1 st pump having: 1, a first shell; a rotating shaft rotatably provided in the 1 st housing; a wall surface portion located on an axis of the rotation shaft and located on one side of the 1 st housing; a 1 st suction part and a 1 st discharge part formed on the wall surface part of the 1 st housing; a convex portion that is provided on an inner side surface portion of at least one of the 1 st suction portion and the 1 st discharge portion and is provided at a center in a width direction orthogonal to a flow direction of the fluid flowing in the 1 st suction portion and the 1 st discharge portion, the convex portion being an elliptical cone having a major axis along the flow direction of the fluid flowing in the 1 st suction portion and the 1 st discharge portion, and the convex portion becoming tapered as going toward a projecting direction; and a fixing hole formed from an outer surface of the wall surface portion toward the convex portion; and
a 2 nd pump having: a 2 nd housing; a 2 nd suction part formed on a 1 st wall surface part and communicated with the 1 st suction part of the 1 st pump; and a 2 nd discharge portion formed in a 2 nd wall surface portion of the 2 nd casing facing in the same direction as a side surface portion of the 1 st casing in which the discharge port portion of the 1 st discharge portion is formed, the 2 nd pump being fixed to the outer surface of the wall surface portion by attaching a fixing member to the fixing hole portion.
9. A construction machine is provided with:
a pump unit as claimed in any one of claims 1 to 8; and
a vehicle body on which the pump unit is mounted.
Technical Field
The invention relates to a pump unit and a construction machine.
Background
As a hydraulic pump unit mounted on a construction machine such as a hydraulic excavator, a pump unit including two types of pumps, a main pump and a gear pump, is known.
The main pump has a rotary shaft supported to be rotatable in a pump housing, for example. A cylinder is fitted and fixed to the outer peripheral surface of the rotating shaft. The rotary shaft and the cylinder block rotate integrally. The cylinder block is provided with a plurality of cylinder bores. A piston is inserted into each cylinder bore. Then, the cylinder bore and the piston constitute a cylinder chamber.
A suction path and a discharge path through which the working oil flows are formed in the bottom of the portion of the pump housing forming the cylinder chamber. Further, a swash plate supported to be rotatable with respect to the pump housing is provided at an end portion of the piston opposite to the end portion of the portion where the cylinder chamber is formed.
With this structure, the pistons slide along the swash plate, and displacement of the pistons in the cylinder bores is restricted by the swash plate. When the piston slides along the swash plate, the piston slides in the cylinder hole. Thereby, the volume of the cylinder chamber changes. When the cylinder chamber expands, the working oil is sucked from the outside of the pump housing to the cylinder chamber through the suction path. When the cylinder chamber contracts, the working oil in the cylinder chamber is discharged to the outside of the pump housing through the discharge passage.
On the other hand, the gear pump includes a gear housing and two gears housed in the gear housing. The working oil is sucked or discharged by rotating the two gears that mesh with each other.
Disclosure of Invention
Problems to be solved by the invention
However, when the pump unit is to be downsized, it is conceivable to integrate the main pump and the gear pump.
In addition, in order to improve the driving efficiency of the pump unit, it is conceivable to couple the rotary shaft of the main pump and the gear of the gear pump. With this configuration, the gear pump can be driven by the rotation of the rotary shaft in the main pump.
In order to achieve the above-described reduction in size and improvement in drive efficiency, it is preferable to arrange the gear pump coaxially with the rotation shaft of the main pump and integrate them. However, in the case where the gear pump is thus configured, it is necessary to fasten, for example, bolts for fixing the gear pump to the bottom of the pump housing. Since the suction path and the discharge path are formed in the pump housing, the female screw portion for fastening the bolt penetrates the suction path or the discharge path on the outside of the pump housing. Therefore, there is a possibility that the main pump may not operate normally.
It is also conceivable to increase the thickness of the bottom of the pump housing so that the suction path or the discharge path does not penetrate the outside of the pump housing even if a female screw portion is formed in the bottom of the pump housing. However, if the bottom of the pump housing is thickened, the axial length of the pump unit becomes long.
The invention provides a pump unit and a construction machine, which can reliably realize miniaturization and high efficiency of driving efficiency.
Means for solving the problems
A pump unit according to an aspect of the present invention includes: a 1 st pump having: 1, a first shell; a rotating shaft rotatably provided in the 1 st housing; a wall surface portion located on an axis of the rotation shaft and located on one side of the 1 st housing; a 1 st suction part and a 1 st discharge part formed on the wall surface part of the 1 st housing; a convex portion provided on an inner side surface portion of at least one of the 1 st suction portion and the 1 st discharge portion; and a fixing hole formed from an outer surface of the wall surface portion toward the convex portion; and a 2 nd pump fixed to the outer surface of the wall surface portion by attaching a fixing member to the fixing hole portion.
With this configuration, even if the fixing hole is formed in the wall surface portion of the pump housing in which the 1 st suction portion and the 1 st discharge portion are formed, the outside of the pump housing can be prevented from penetrating the 1 st suction portion or the 1 st discharge portion through the fixing hole without increasing the thickness of the wall surface portion. Therefore, the axial length of the pump unit can be suppressed from increasing, and the pump unit can be downsized. Further, since the 2 nd pump (gear pump) can be disposed on the wall surface portion of the 1 st pump located on the axis of the rotary shaft, the rotational force of the rotary shaft in the 1 st pump can be easily transmitted to the housing (gear housing) of the 2 nd pump. Therefore, the driving efficiency of the pump unit can be improved.
In the above configuration, the convex portion may be disposed at a center in a width direction orthogonal to a flow direction of the fluid flowing through the 1 st suction portion and the 1 st discharge portion.
With this configuration, it is possible to suppress a large difference in flow rate between the right side and the left side of the liquid around the convex portion in the direction perpendicular to the flow of the liquid. Therefore, the disturbance of the flow of the liquid in the 1 st suction unit and the 1 st discharge unit can be suppressed to the minimum, and the flow of the liquid can be stabilized.
Therefore, the driving efficiency of the pump unit can be further improved.
In the above configuration, the 2 nd pump may include: a 2 nd housing; a 2 nd suction unit formed on a 1 st wall surface portion of the 2 nd casing and configured to suck liquid into the 2 nd casing; and a 2 nd discharge portion formed in a 2 nd wall surface portion of the 2 nd casing for discharging liquid out of the 2 nd casing, a side surface portion of the 1 st casing in which a discharge port portion of the 1 st discharge portion is formed facing in the same direction as the 2 nd wall surface portion of the 2 nd casing.
With this configuration, the 1 st discharge port of the 1 st pump is disposed adjacent to the 2 nd discharge port of the 2 nd discharge portion of the 2 nd pump. Therefore, the work of connecting the pipes to the respective discharge portions and the work of routing the pipes can be easily performed.
In the above configuration, the 1 st suction part of the 1 st pump may communicate with the 2 nd suction part of the 2 nd pump.
With this configuration, the liquid can be guided to the 2 nd suction unit of the 2 nd pump through the 1 st suction unit of the 1 st pump. Therefore, the structure of each suction portion can be simplified, and the pump unit can be further downsized.
In the above configuration, the convex portion may be tapered as it goes toward the projecting direction.
With this configuration, the flow path resistance to the liquid by the convex portion can be reduced as much as possible. Therefore, the disturbance of the flow of the liquid in the 1 st suction unit and the 1 st discharge unit can be suppressed as much as possible. Therefore, the driving efficiency of the pump unit can be further improved.
In the above configuration, the convex portion may be an elliptical cone, and a long axis of the convex portion may be along a flow direction of the fluid flowing through the 1 st suction portion and the 1 st discharge portion.
With this configuration, the flow path resistance to the liquid by the convex portion can be reliably reduced. Therefore, the turbulence of the flow of the liquid in the 1 st suction unit and the 1 st discharge unit can be reliably suppressed. Therefore, the driving efficiency of the pump unit can be reliably improved.
A pump unit according to another aspect of the present invention includes: a 1 st pump having: 1, a first shell; a rotating shaft rotatably provided in the 1 st housing; a wall surface portion located on an axis of the rotation shaft and located on one side of the 1 st housing; a 1 st suction part and a 1 st discharge part formed on the wall surface part of the 1 st housing; a convex portion that is provided on an inner side surface portion of at least one of the 1 st suction portion and the 1 st discharge portion and is provided at a center in a width direction orthogonal to a flow direction of the fluid flowing in the 1 st suction portion and the 1 st discharge portion, the convex portion being an elliptical cone having a major axis along the flow direction of the fluid flowing in the 1 st suction portion and the 1 st discharge portion, and the convex portion becoming tapered as going toward a projecting direction; and a fixing hole formed from an outer surface of the wall surface portion toward the convex portion; and a 2 nd pump having: a 2 nd housing; a 2 nd suction part formed on a 1 st wall surface part and communicated with the 1 st suction part of the 1 st pump; and a 2 nd discharge portion formed in a 2 nd wall surface portion of the 2 nd casing facing in the same direction as a side surface portion of the 1 st casing in which the discharge port portion of the 1 st discharge portion is formed, the 2 nd pump being fixed to the outer surface of the wall surface portion by attaching a fixing member to the fixing hole portion.
With this configuration, the pump unit can be downsized and the driving efficiency can be improved.
A construction machine according to another aspect of the present invention includes the pump unit described above and a vehicle body on which the pump unit is mounted.
With this configuration, it is possible to provide a construction machine that can be reliably reduced in size and increased in driving efficiency.
ADVANTAGEOUS EFFECTS OF INVENTION
The pump unit and the construction machine can be reliably miniaturized and have high driving efficiency.
Drawings
Fig. 1 is a schematic configuration diagram of a construction machine according to an embodiment of the present invention.
Fig. 2 is a structural diagram of a pump unit in the embodiment of the present invention.
Fig. 3 is a side view seen from a in fig. 2.
Fig. 4 is a cross-sectional view of the convex portion in the axial direction in the modification of the embodiment of the present invention.
Fig. 5 is a sectional view taken along line B-B of fig. 4.
Description of the reference numerals
1. A main pump (1 st pump); 2. a main case (1 st case); 3. a rotating shaft; 100. a construction machine; 101. a revolving body (vehicle body); 102. a movable body (vehicle body); 110. a pump unit; 111. a gear pump (2 nd pump); 119. a bottom wall (wall surface portion); 119b, an outer surface; 119d, a 2 nd side surface (side surface portion); 122. a 1 st suction path (1 st suction unit); 122b, an inner side surface (inner side surface portion); 123. a 1 st discharge path (1 st discharge unit); 123a, an exhaust port (exhaust port portion); 126. a convex portion; 127. an internal thread portion (fixing hole portion); 141. a gear housing (2 nd housing); 141a, a wall surface (wall surface part 1); 141c, the 2 nd side wall surface (the 2 nd wall surface portion); 144. a 2 nd suction path (2 nd suction part); 147. a bolt (fixing member); 148. a 2 nd discharge path (2 nd discharge unit); C. a central axis (axis); J. a long axis.
Detailed Description
Next, embodiments of the present invention will be described with reference to the drawings.
(construction machine)
Fig. 1 is a schematic configuration diagram of a construction machine 100.
As shown in fig. 1, the construction machine 100 is, for example, a hydraulic excavator. The construction machine 100 includes a revolving structure (corresponding to a vehicle body in claims) 101 and a moving body (corresponding to a vehicle body in claims) 102. The revolving unit 101 is provided on the moving body 102 so as to be revolvable. The rotator 101 is provided with a
Rotator 101 includes: a cab 103 on which an operator can ride; a boom 104 having one end connected to the cab 103 so as to be swingable; an arm 105 having one end connected to the other end (distal end) of the boom 104 on the side opposite to the cab 103 so as to be swingable; and a bucket 106 connected to the other end (tip end) of the arm 105 on the opposite side to the arm 104 so as to be swingable. Further, the
(Pump Unit)
Fig. 2 is a structural view of the
The
(Main Pump)
The main pump 1 is a so-called swash plate type variable displacement hydraulic pump. The main pump 1 includes the following components as main components: a main housing (corresponding to the 1 st housing in claims) 2; a rotary shaft 3 supported to be rotatable with respect to the
In fig. 2, the scale of each member is appropriately changed to make the description easy to understand.
In the following description, a direction parallel to the center axis C of the rotary shaft 3 is referred to as an axial direction, a rotation direction of the rotary shaft 3 is referred to as a circumferential direction, and a radial direction of the rotary shaft 3 is simply referred to as a radial direction.
The
The case main body 9 has a bottom wall (corresponding to a wall surface portion in claims) 119 on a side opposite to the opening 9 a. The cylinder 4 is disposed on the inner surface 119a side of the
The
Further, a rotation shaft insertion hole 121 through which the rotation shaft 3 can be inserted is formed in the
Further, a 1 st suction path (corresponding to a 1 st suction portion in the claims) 122 and a 1 st discharge path (corresponding to a 1 st discharge portion in the claims) 123 are formed on both sides of the
A 1 st communication path 124 communicating the 1
Further, a 2 nd communication path 125 communicating the 1
Further, an O-ring groove 118 is formed on an
With this configuration, the working oil is sucked into the 1
Here, a substantially
A female screw portion (corresponding to a fixing hole portion in claims) 127 is formed in the
The 1 st discharge path 123 includes a discharge port (corresponding to a discharge port portion in the claims) 123a on a 2 nd side surface (corresponding to a side surface portion in the claims) 119d of the
A 3 rd communication path 128 for communicating the 1 st discharge path 123 with the inner surface 119a of the
The front flange 10 is formed with a through hole 13 through which the rotary shaft 3 can pass. The through hole 13 is provided with a bearing 14 for rotatably supporting the other end side of the rotary shaft 3. Further, an oil seal 15 is provided in the through hole 13 at a position on the opposite side of the bearing 14 from the housing main body 9 (outside the front flange 10). Further, two
The rotary shaft 3 is formed to have a step shape. The rotary shaft 3 has a structure in which the following components are coaxially arranged: a rotation shaft main body 131 disposed in the
The 1 st bearing portion 132 has a smaller shaft diameter than the shaft diameter of the rotation shaft main body 131. The 1 st bearing portion 132 is rotatably supported by the bearing 11 of the
The transmission shaft 133 has a function of transmitting the rotational force of the rotary shaft 3 to the
The 2 nd bearing 134 has a smaller axial diameter than the rotation shaft main body 131. The 2 nd bearing portion 134 is rotatably supported by the bearing 14 of the front flange 10.
The coupling shaft 135 is coupled to a power source such as an engine, not shown. The coupling shaft 135 has a smaller shaft diameter than the 2 nd bearing 134. The tip end of the connecting shaft 135 protrudes outside the front flange 10 via the bearing 14. The oil seal 15 prevents foreign matter from entering between the tip end portion and the front flange 10. A 1 st spline 135a is formed at the tip of the coupling shaft 135. A power source such as an engine, not shown, is coupled to the rotary shaft 3 via the 1 st spline 135 a.
The 2 nd spline 131a is formed in the rotation shaft main body 131. A cylinder 4 is fitted to the rotation shaft main body 131 at a portion corresponding to the 2 nd spline 131 a.
The cylinder 4 is formed in a cylindrical shape. A through hole 16 into which the rotary shaft 3 can be inserted or pressed is formed at the radial center of the cylinder 4. The through hole 16 is also formed with splines 16 a. The spline 16a is spline-coupled to a 2 nd spline 131a of the rotary shaft body 131. Thereby, the rotary shaft 3 rotates integrally with the cylinder 4.
A recess 20 is formed in a section from the axial center of the through hole 16 to the end 4a closer to the
Further, a plurality of cylinder holes 17 are formed in the cylinder block 4 so as to surround the periphery of the rotary shaft 3. The cylinder holes 17 are arranged at equal intervals in the circumferential direction. Further, the cylinder hole 17 is formed along the axial direction, and the side of the cylinder hole 17 closer to the front flange 10 is open. Communication holes 18 for communicating the cylinder holes 17 with the outside of the cylinder block 4 are formed in the end portion 4a of the cylinder block 4 at positions corresponding to the cylinder holes 17.
A disc-shaped valve plate 19 is provided at the end 4a of the cylinder block 4 so as to overlap the end face of the end 4 a. The valve plate 19 is fixed to the housing main body 9. Even when the cylinder block 4 rotates together with the rotary shaft 3, the valve plate 19 is stationary with respect to the main casing 2 (casing main body 9).
A supply port 19a and a discharge port, not shown, which communicate with the communication holes 18 of the cylinder block 4 are formed in the valve plate 19 so as to penetrate through the valve plate 19 in the thickness direction. Each cylinder hole 17 communicates with the 1 st communication path 124 formed in the housing main body 9 via the supply port 19a of the valve plate 19 and the communication hole 18 of the cylinder block 4. Further, each cylinder hole 17 communicates with the 3 rd communication path 128 formed in the housing main body 9 through a discharge port, not shown, of the valve plate 19 and the communication hole 18 of the cylinder block 4.
Since the valve plate 19 is fixed to the housing main body 9, the cylinder hole 17 switches between a state in which the hydraulic oil is supplied from the 1
The piston 21 is housed in each cylinder bore 17 so that the piston 21 can slide in the axial direction. The piston 21 is housed in the cylinder hole 17, and the piston 21 revolves around the center axis C of the rotary shaft 3 as the rotary shaft 3 and the cylinder 4 rotate.
A spherical projection 28 is integrally formed at the end of the piston 21 on the front flange 10 side. In addition, the interior of the piston 21 is formed as a cavity. The cavity is filled with the working oil in the cylinder bore 17. Thus, the reciprocating motion of the piston 21 is associated with the supply and discharge of the working oil with respect to the cylinder bore 17. That is, when the piston 21 is pulled out from the cylinder hole 17, the working oil is supplied from the 1
The spring 23 housed in the recess 20 of the cylinder 4 is, for example, a coil spring. The spring 23 is compressed between two holders 24a, 24b housed in the recess 20. Therefore, the spring 23 generates a biasing force in the extending direction due to its elastic force. The biasing force of the spring 23 is transmitted to the coupling member 26 via one holder 24b of the two holders 24a, 24 b. A pressing member 27 is fitted to the outer peripheral surface of the rotary shaft main body 131 at a position closer to the front flange 10 than the connecting member 26. The biasing force of the spring 23 is transmitted to the pressing member 27 via the coupling member 26.
The front flange 10 has a swash plate 5 provided on an inner surface 10a on the housing main body 9 side. The sloping plate 5 is arranged to be tiltable relative to the front flange 10. The swash plate 5 has a function of restricting displacement of each piston 21 in the axial direction by inclining relative to the front flange 10. A through hole 32 through which the rotation shaft 3 can pass is formed in the radial center of the swash plate 5. A flat sliding surface 5a is formed on the swash plate 5 on the cylinder block 4 side. A plurality of shoes 22 are slidably disposed on the sliding surface 5 a.
The plurality of shoes 22 are attached to the convex portion 28 of the piston 21. A spherical concave portion 22a is formed on the surface of the portion of the shoe 22 that receives the convex portion 28 so as to match the shape of the convex portion 28. The convex portion 28 of the piston 21 is fitted into the concave portion 22 a. Thereby, the shoe 22 is rotatably connected to the convex portion 28 of the piston 21. Each shoe 22 is integrally held by a shoe holding member 29. The pressing member 27 abuts on the shoe holding member 29, and the shoe holding member 29 is pressed toward the swash plate 5 by the pressing member 27. Thereby, the shoe 22 slides so as to follow the sliding surface 5a of the swash plate 5. The inclination angle of the swash plate 5 is controlled by an actuator, not shown.
(Gear pump)
The
In addition, an adapter through-hole 149 is formed in a wall surface 141a of the
The
Each mounting
A
Here, the
On the other hand, a bolt 147 inserted through a
Further, a 2 nd discharge path (corresponding to a 2 nd discharge portion in claims) 148 is formed on the 2 nd side wall surface 141c of the
The two
Of the two
(action of Pump Unit)
Next, the operation of the
First, the operation of the main pump 1 will be described.
The main pump 1 outputs a driving force based on discharge of the hydraulic oil from the cylinder bore 17 (and supply of the hydraulic oil to the cylinder bore 17).
More specifically, the rotary shaft 3 is rotated by power from a power source such as an engine, and the cylinder block 4 and the rotary shaft 3 rotate integrally. The piston 21 revolves around the center axis C of the rotary shaft 3 with the rotation of the cylinder 4.
Regardless of the inclination angle of the swash plate 5, the shoes 22 attached to the convex portions 28 of the pistons 21 are properly pressed against the sliding surface 5a of the swash plate 5 following the sliding surface 5a of the swash plate 5 by the biasing force of the spring 23. The convex portion 28 of the piston 21 is formed in a spherical shape, and the concave portion 22a of the shoe 22 into which the convex portion 28 is fitted is also formed in a spherical shape. Further, each shoe 22 is pressed toward the swash plate 5 by the pressing member 27 via the shoe holding member 29. Therefore, even if the inclination angle of the swash plate 5 changes, the shoes 22 follow the inclination of the swash plate 5 and properly follow the sliding surface 5a and are pressed against the sliding surface 5 a.
When the piston 21 revolves around the center axis C of the rotary shaft 3 as the cylinder block 4 rotates, the shoes 22 slide on the sliding surface 5a of the swash plate 5 while revolving around the center axis C of the rotary shaft 3. Thereby, each piston 21 slides in the axial direction in each cylinder bore 17, and each piston 21 reciprocates. Thus, the swash plate 5 restricts displacement of each piston 21 in the direction along the axial direction. In response to the reciprocating motion of the piston 21, the hydraulic oil is discharged from a part of the cylinder bores 17 through the 1 st discharge path 123 and the discharge port 13 a. In addition, the working oil is sucked into the other cylinder bores 17 through the suction port 122a and the 1
Here, a
When the inclination angle of the swash plate 5 (sliding surface 5a) changes, the stroke (sliding distance) of the reciprocating motion of the piston 21 changes. That is, the larger the inclination angle of the swash plate 5, the larger the supply amount and discharge amount of the hydraulic oil to the cylinder bores 17 generated by the reciprocation of each piston 21. On the other hand, the smaller the inclination angle of the swash plate 5, the smaller the supply amount and discharge amount of the hydraulic oil to the cylinder bores 17, which are generated in accordance with the reciprocation of the pistons 21. When the inclination angle of the swash plate 5 is 0 degree, each piston 21 does not reciprocate even if the piston 21 revolves around the center axis C of the rotary shaft 3. Therefore, the discharge amount of the hydraulic oil from each cylinder bore 17 is also zero.
Next, the operation of the
The
In the above embodiment, the
In addition, the
The
Further, a discharge port 123a formed in the 1 st discharge path 123 of the main pump 1 is formed in the 2
In addition, the 1
The present invention is not limited to the above-described embodiments, and various modifications may be made to the above-described embodiments without departing from the scope of the present invention.
For example, in the above-described embodiment, the
In the above-described embodiment, the case where the
(modification example)
Fig. 4 is a cross-sectional view along the axial direction showing a modification of the
As shown in fig. 4 and 5, the
Therefore, the same effects as those of the above-described embodiment can be obtained by adopting the above-described modification. Further, since the
In the above-described embodiment, the case where the
In the above-described embodiment, the case where the
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