JPH06147095A - Swash plate type hydraulic pump-motor - Google Patents

Abstract

PURPOSE:To facilitate each forming of a first recess and a fulcrum member and a positional alteration in a tilt rolling straight line and check any cavity in the first recess. CONSTITUTION:Since each outer surface of a first recess 60 and one side of a fulcrum member 62 is composed of a part of a circumferential surface and a flat surface, its forming is easy in comparison with a spherical surface. In addition, a height position of a tilt rolling straight line is easily changed by way of varying the length of a columnar part of the fulcrum member 62, and furthermore, a surface receiving a component force from a plunger in the first recess 60 is nearly rectangular and wider than a semicircle, so any cavity is checked.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a swash plate type fluid pump / motor in which a stroke of a plunger is changed by tilting a swash plate between two tilting positions.

[0002]

2. Description of the Related Art As a conventional swash plate type fluid motor, for example, one described in Japanese Utility Model Publication No. 4-29430 is known. This is a device in which a thin portion of a swash plate is pressed by a piston from the back side of the swash plate between two tilting positions about a tilting line connecting a fulcrum member composed of two spheres supported by a casing. The stroke of the plunger in the cylinder block, which is in sliding contact with the inclined surface of the swash plate, is changed in two steps by tilting. The tilt support of the swash plate in this one is such that two hemispherical first spherical concave portions are formed apart from each other on the tilt straight line on the facing surface of the casing facing the back surface of the swash plate, and Two hemispherical second spherical recesses respectively facing the first spherical recess are formed on the back surface of the swash plate on the tilting straight line,
This is done by inserting half of the fulcrum member made of a sphere into these first spherical recesses and inserting the other half of the fulcrum member into the second spherical recesses.

[0003]

However, in such a conventional swash plate type fluid motor, the hemispherical first and second spherical concave portions and the fulcrum member of the spherical body are required for the tilting of the swash plate. However, since such a hemispherical recess and a fulcrum member of a spherical body cannot smoothly function as a fulcrum unless they are manufactured with high accuracy, a great deal of labor and time is required to form these recesses and fulcrum members. There is a problem that is required. Further, the height position of the tilting line has a great influence on the stroke determination of the plunger, but the position of this tilting line is such that when the fulcrum member is a sphere, the center of curvature of the fulcrum member (first and second spherical shapes). Since it is a straight line connecting (the same as the center of curvature of the concave portion), it is necessary to change the depth of the first and second spherical concave portions, which are difficult to form as described above, when trying to change the position of this tilting straight line. However, there is a problem that a lot of labor and time are required. Furthermore, in such a swash plate type fluid motor, the swash plate receives a large component force that tends to slide toward the thick portion due to the pressing force from the plunger. Since the first and second spherical concave portions having a narrow width are received, when the fluid motor is operated for a long time, the spherical concave portions are fatigued and are depressed (especially when the first spherical concave portion formed in the casing is depressed, the casing itself is damaged). They have to be replaced).

According to the present invention, it is easy to form the first concave portion and the fulcrum member and change the height position of the tilting straight line, and it is possible to suppress the depression of the first concave portion formed in the casing. -The purpose is to provide a motor.

[0005]

The object is to tilt the straight line connecting the two fulcrum members supported by the casing by pressing the thin portion of the swash plate from the back side with the piston. In the swash plate type fluid pump / motor, the stroke of the plunger in the cylinder block slidingly contacting the inclined surface of the swash plate is changed by tilting the swash plate between the two tilt positions. A facing surface of the casing facing the step surface, a step surface located near the tilting line, a first flat surface located closer to the thin portion of the swash plate than the step surface, and a thick portion of the swash plate than the step surface. And a second flat surface that is located on the side and protrudes toward the swash plate from the first flat surface, and a part of the second flat surface on the tilt line is open to the step surface and the side surface is vertical. The bottom surface is a flat surface located on the same plane as the first flat surface. Two concave portions are formed apart from each other, and two concave portions having a substantially semicircular cross section cut along a plane perpendicular to the tilting line on the back surface of the tilting line are two facing each other. Further, a columnar portion having both a side surface that comes into surface contact with the vertical side surface and a flat one end surface that comes into surface contact with the bottom surface is formed on one side of each fulcrum member, and a tilted straight line is formed on the other side. This can be achieved by forming curved surface portions having a substantially semicircular cross section cut along a vertical plane, and inserting a part of the columnar portions of these fulcrum members into the first concave portion and the curved surface portions into the second concave portion.

[0006]

In the present invention, the first recess formed in the casing has a vertical side surface and a bottom surface that is a flat surface that is flush with the first flat surface. Although it has a side surface that is in surface contact with the vertical side surface and a flat one end surface that is in surface contact with a flat bottom surface, these surfaces are all easier to form than a spherical surface. As a result, the formation of the first recess and the fulcrum member becomes easier than in the conventional case. The position of the tilted straight line is the straight line connecting the centers of curvature of the curved surface parts,
The height position of this straight line can be easily changed by changing the length of the columnar portion of the fulcrum member, and the stroke adjustment of the plunger becomes easy. Further, since the bottom surface of the first recess formed in the casing is a flat surface, the component force of the plunger is received by the substantially rectangular surface. Since the depth of the first concave portion can be easily made deep (the surface that receives the component force can be easily widened), the depression in the first concave portion can be effectively suppressed.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 21 is, for example, a swash plate type fluid motor for driving a crawler vehicle. The fluid motor 21 has a case main body 22, and the other end surface of the case main body 22 has a cylindrical storage chamber extending toward one side. 23 are formed. A side plate 24 is fixed to the other end of the case main body 22, so that the storage chamber 23 is closed and sealed by the side plate 24. 28 is a rotary shaft whose other side is inserted into the storage chamber 23. The rotary shaft 28 is a pair of bearings.
It is rotatably supported by the side plate 24 and the case body 22 via 29 and 30. One end of the rotary shaft 28 projects from the case body 22 and is connected to a sprocket that engages with a crawler (not shown). 31 is a storage room 23
Is a ring-shaped plate fixed to the bottom surface, that is, one end surface, and the rotary shaft 28 is loosely fitted in the plate 31. The case body 22, the side plate 24, the plate 31, and the fixed plate 37 described later together form a casing 33 of the fluid motor 21 as a whole.

Reference numeral 38 denotes a cylindrical cylinder block housed in the housing chamber 23. The other end of the rotary shaft 28 is inserted into the cylinder block 38 and spline-connected to the cylinder block 38. The rotary shaft 28 is connected to the rotary shaft 28 so as to rotate integrally therewith. This cylinder block 38
A plurality of cylinder holes 39 extending in the axial direction are formed in one end surface of the cylinder holes 39, and these cylinder holes 39 are arranged equidistantly in the circumferential direction. Within these cylinder holes 39 are cylinder holes 39
And the same number of plungers 40 are slidably inserted,
A spherical sphere portion 41 is formed at the tip of each plunger 40, that is, at one end. 42 is a cylinder block fixed to the side plate 24
The timing plate 42 is a timing plate located between the side plate 24 and the side plate 24. Two long arc-shaped holes 43 are formed in the timing plate 42 in the circumferential direction, and the cylinder holes 39 are formed in the arc-shaped holes 43. 38 turns to connect one after another. Reference numerals 44 and 45 denote supply / discharge passages formed in the side plate 24. The supply / discharge passage 44 is always in communication with one arc-shaped hole 43, and the supply / discharge passage 45 is always in communication with the other arc-shaped hole 43. Also, these supply and discharge passage
44 and 45 are connected to a pump and a tank via a switching valve (not shown), and when the switching valve is switched, one of them becomes a supply side and the other becomes a discharge side.

1, 2, 3, and 4, reference numeral 51 denotes a swash plate which is disposed between the cylinder block 38 and the plate 31 and can be tilted about a tilting straight line L described later.
The swash plate 51 has a substantially ring shape, and the rotary shaft 28 penetrates the inside thereof. An inclined surface (the other end surface) 52 of the swash plate 51 facing the cylinder block 38 is inclined with respect to a vertical plane with respect to the axis of the rotating shaft 28, and as a result, the swash plate 51 forms a thick portion 53 with a central portion as a boundary. It can be divided into a thin portion 54. Further, the facing surface 32 of the casing 33 is opposed to the back surface (one end surface) 55 of the swash plate 51 located on the opposite side of the inclined surface 52, and the facing surface 32 is a thick wall of the swash plate 51. A thin fixed plate 37 is detachably attached to the other end surface of the plate 31 facing the portion 53, so that a step surface (fixed plate extending along the tilting line L in the vicinity of the tilting line L is fixed.
The inner side surface of the rotary shaft 28 of the rotary plate 28 is close to the rotary shaft 28, and its height is equal to the wall thickness of the fixed plate 37. A first flat surface (the other end surface of the plate 31) 35 which is parallel to a surface perpendicular to the axis,
The rotary shaft is located closer to the thick portion 53 of the swash plate 51 than the step surface 34.
It is composed of a second flat surface (the other end surface of the fixed plate 37) 36 which is parallel to the surface perpendicular to the axis of 28 and protrudes from the first flat surface 35 toward the swash plate 51. Since the fixed plate 37 is detachably attached to the plate 31 in this manner, the step surface 34 and the first recess 60 described later can be easily formed. On the other hand, the back surface 55 of the swash plate 51 is located substantially on the thin-walled portion 54 side in parallel with the plane perpendicular to the axis of the rotary shaft 28, and faces the first flat surface 35, and a third flat surface 56 and the third flat surface. A fourth flat surface 57, which is tilted at a predetermined small angle A with respect to the surface 56 and is located on the thick portion 53 side, and which faces the second flat surface 36, and these third and fourth flat surfaces 56, 57. The stepped surfaces 34 are connected to each other and face each other in close proximity to the stepped surface 34 and have a height equal to the stepped surface 34. The stepped surfaces 34, 58 are thick portions from the center of the swash plate 51. It is a certain distance away from the 53 side.

In FIGS. 1, 2, 3, 4, and 5, a semi-cylindrical first concave portion 60 is formed on the second flat surface 36 on the tilted straight line L.
Two are formed at a predetermined distance in the extending direction of the tilted straight line L, and each first recess 60 is partially opened in the step surface 34. In addition, the side surface 60a of each of the first recesses 60 has a second flat surface 36a.
Is a semi-circular surface perpendicular to the first flat surface 35b.
It is a flat surface located on the same plane as and has a semicircular shape. On the other hand, the back surface 55 of the swash plate 51 facing the first recesses 60, more specifically, the third and fourth flat surfaces 56 near the step surface 58,
In 57, a cross section taken along a plane perpendicular to the tilting straight line L is a substantially semicircular shape, and a cross section taken along a plane including the tilting straight line L is also a substantially semicircular shape. The second
Two concave portions 61 are formed. Reference numeral 62 denotes two fulcrum members, and a columnar portion 63 having a cylindrical shape with the same diameter as the first recess 60 is formed on one side of the fulcrum members 62. One half of the columnar portion 63 of the fulcrum member 62 is inserted into the first recess 60, and as a result, one side (half the outer peripheral surface) of the side surface 63a of the columnar portion 63 is formed in the first recess 60. Vertical side 60a
On the other hand, the flat one end surface 63b of the columnar portion 63 makes surface contact with the flat bottom surface 60b of the first recess 60. Further, on the other side of the fulcrum member 62, the cross section taken along a plane perpendicular to the tilting straight line L is substantially semicircular, and here the cross section taken along the plane containing the tilting straight line L is also substantially semicircular. A curved surface portion 64 having a substantially hemispherical shape as a whole is formed, and the curved surface portion 64 has a second concave portion with its outer surface in spherical contact with the inner surface of the second concave portion 61.
It is inserted in 61. The maximum diameter of the curved surface portion 64 and the outer diameter of the columnar portion 63 are the same. In the first recess 60 formed in the casing 33 as described above, the side surface 60a is a vertical semicircular surface, the bottom surface 60b is a flat surface, and the fulcrum member 62 is provided.
The side surface 63a formed on one side is a circumferential surface, and the one end surface 63b is a flat surface, and all are easy to form as compared with a spherical surface. As a result, the formation of the first recess 60 and the fulcrum member 62 becomes easier than in the conventional case. Then, as described above, the columnar portion 63 of the fulcrum member 62 is provided in the first concave portion 60, and the curved surface portion 64 is provided in the second concave portion 60.
When inserted in the recess 61, the swash plate 51 forms a straight line (the tilted straight line L) connecting these two fulcrum members 62, specifically, the centers of curvature of the curved surface portions 64 (the same as the centers of curvature of the second recesses 61). As a center, a first tilted position F (shown by a solid line in FIG. 2) where the third flat surface 56 and the first flat surface 35 are in surface contact with each other, and a fourth flat surface 57.
It is possible to tilt between a second tilting position G (shown by an imaginary line in FIG. 2) where the second flat surface 36 and the second flat surface 36 are in surface contact with each other. Here, when the swash plate 51 is tilted, the fulcrum member 62 moves to the first concave portion.
In order to prevent the curved surface portion 64 from slipping out, the center of curvature of the curved surface portion 64 may be arranged on one side of the extension surface of the second flat surface 36.

70 is the same number of shoes as the plunger 40,
Each shoe 70 has a ball hole in which the ball 41 of the plunger 40 is stored.
71 is formed. The ball portion 41 and the ball hole 71 described above collectively constitute a ball joint joint 72, whereby one end of the plunger 40 and the shoe 70 are connected via the ball joint joint 72. The shoes 70 are formed on the inclined surface 52 of the swash plate 51.
Slidably engaged with. A retainer plate 73 is a ring-shaped retainer plate loosely fitted to the outside of the rotary shaft 28. The retainer plate 73 is arranged between the cylinder block 38 and the swash plate 51 and engages with all the shoes 70. ing.
74 is a thrust ball arranged between the cylinder block 38 and the retainer plate 73.
The outer surface of 74 on the side close to the retainer plate 73 is formed of a part of a spherical surface. And this thrust ball
The outer surface of 74 makes spherical contact with the inner circumference of the retainer plate 73, and the thrust ball 74 is fitted to the outside of the rotary shaft 28 and connected by spline coupling. A spring 75 is interposed between the cylinder block 38 and the thrust ball 74.
The shoe 70 is pressed against the inclined surface 52 to prevent the shoe 70 from rising from the inclined surface 52.

The casing 33 facing the back surface 55 of the swash plate 51 on the thin portion 54 side, that is, the third flat surface 56, more specifically, the case body 22.
And a cylinder chamber 80 is formed inside the plate 31,
A piston 82 is inserted into the cylinder chamber 80 so as to be movable in the axial direction of the rotary shaft 28. And this piston 82
Has a rod portion 83 having a small diameter whose tip abuts against the back surface 55 (third flat surface 56) of the thin portion 54 of the swash plate 51. 84 is casing 33
It is a fluid passage formed inside, one end of this fluid passage 84 is connected to a fluid source (not shown), and the other end is connected to the cylinder chamber 80. When the high pressure fluid is supplied to the cylinder chamber 80 through the fluid passage 84, the piston
Since the rod portion 83 moves toward the swash plate 51 while the rod portion 83 is in contact with the back surface 55 of the thin portion 54 of the swash plate 51, the swash plate 51 has the first tilted position about the tilted straight line L. When tilting from F to the second tilting position G and the supply of high-pressure fluid to the cylinder chamber 80 is stopped, the tilting straight line L is offset from the center of the swash plate 51 to the thick portion 53 side. The swash plate 51 is tilted from the second tilt position G to the first tilt position F by the pressing force from the plunger 40. Thereby, the cylinder block
The stroke of the plunger 40 in 38 has been changed to two stages,
The rotation speeds of the cylinder block 38 and the rotary shaft 28 change in two steps.

Next, the operation of the embodiment of the present invention will be described. When the high-pressure fluid is supplied from the supply / discharge passage 44 to the cylinder hole 39 of the cylinder block 38 through the one arc-shaped hole 43, the plunger 40 in the cylinder hole 39 projects toward the swash plate 51 and presses the inclined surface 52. , At this time, the plunger
Since the tip of 40 is engaged with the inclined surface 52 via the shoe 70, the component force of the pressing force acts on the plunger 40, whereby the plunger 40 and the shoe 70 move on the inclined surface 52 on the thick portion. 53
Slide from the side toward the thin portion 54 side,
40, the cylinder block 38, and the rotating shaft 28 rotate integrally. By the rotation of the cylinder block 38, the plunger 40 in the cylinder hole 39 communicating with the other arcuate hole 43 is
Since the swash plate 51 moves from the thin portion 54 side toward the thick portion 53 side while engaging with the inclined surface 52 via the shoe 70, the inclined surface 52 gradually pushes the cylinder 52 into the cylinder hole 39, The fluid in the cylinder hole 39 is pushed out and the other arc-shaped hole 43, the supply / discharge passage
Discharge through 45. At this time, the shoe 70 is pressed against the inclined surface 52 of the swash plate 51 by the urging force of the spring 75 transmitted via the thrust ball 74 and the retainer plate 73, so that the fluid in the cylinder hole 39 is discharged. However, the shoe 70 does not rise above the inclined surface 52. At this time, since the columnar portion 63 of the fulcrum member 62 is only inserted into the semi-cylindrical first concave portion 60 on one side as described above, there is a possibility that it may come out of the first concave portion 60. It is conceivable that a force component of the pressing force is applied from the plunger 40 to the swash plate 51 toward the thick portion 53 side, and this component force acts on the side surface 63a of the columnar portion 63 of the fulcrum member 62 as a stopper. Since the fulcrum member 62 is pressed against the side surface 60a of the first recess 60, the fulcrum member 62 does not slip out of the first recess 60.

Here, for example, when the crawler vehicle is climbing a slope, the fluid motor 21 must rotate at a low speed with a large torque. In this case, the supply of the high-pressure fluid to the cylinder chamber 80 through the fluid passage 84 is stopped, and the swash plate 51 is not pressed by the piston 82. Here, as described above, since the tilting straight line L is offset from the center of the swash plate 51 to the thick portion 53 side, the swash plate is pressed by the pressing force from the plunger 40.
51 is tilted to a first tilting position F where the first flat surface 35 and the third flat surface 56 are in surface contact with each other. At this time, the stroke of the plunger 40 in the cylinder block 38 becomes longer, but the amount of high-pressure fluid flowing into the fluid motor 21 is constant, so the rotation speed of the cylinder block 38 and the rotation shaft 28 becomes low.

Next, when the crawler vehicle starts to run steadily on level ground, for example, the fluid motor 21 must be rotated at a high speed with a small torque. In this case, the high-pressure fluid is supplied to the cylinder chamber 80 through the fluid passage 84, and the piston 82 is directed toward the swash plate 51 while the rod portion 83 is in contact with the back surface 55 of the thin portion 54 of the swash plate 51. To move. As a result, the swash plate 51 is pushed by the piston 82 and centered on the tilting straight line L, from the first tilting position F to the second flat surface 36 and the fourth flat surface 57.
It tilts to the second tilting position G where and are in surface contact. As a result, the stroke of the plunger 40 in the cylinder block 38 is shortened, and the cylinder block 38 and the rotary shaft 28 rotate at high speed. At this time, if the fixed plate 37 is made of a material having a large specific gravity, the vibration generated in the swash plate 51 during high speed rotation as described above can be effectively damped.

Here, the height position of the tilting straight line L has a great influence on the stroke determination of the plunger 40, but the change of the position of the tilting straight line L changes the length of the columnar portion 63 of the fulcrum member 62. By doing so, the stroke can be adjusted easily, and therefore the stroke of the plunger 40 can be easily adjusted. In addition, the first recess 60 formed in the casing 33 as described above.
Since the bottom surface 60b is a flat surface, the component force by the plunger 40 is received by the substantially rectangular surface (having a larger area than the semicircle), and the depth of the first recess 60 is easily deep ( The surface that receives the component force can be easily widened. As a result, when the fluid motor 21 is operated for a long period of time as described above, the side surface 60a of the first recess 60 can be depressed due to fatigue. Can be suppressed.

6 and 7 are views showing a second embodiment of the present invention. In this embodiment, the step surface 34 is formed into the first recess 60.
The side surface 60a is displaced by a slight distance K1 from the center of curvature of the side surface 60a toward the thin-walled portion 54 of the swash plate 51 so that the side surface 60a has a circumference of 180 degrees or more. As a result, the opening width of the stepped surface 34 of the first recess 60 becomes smaller than the diameter of the first recess 60, and the fulcrum member 62 inserted into the first recess 60 is reliably prevented from coming out of the first recess 60. It At this time, the step surface 58 of the swash plate 51
Is offset from the center of curvature of the second recess 61 toward the thin portion 54 by a distance K2 that is equal to or greater than the distance K1 to reliably prevent interference between the step surfaces 34 and 58.

FIGS. 8, 9 and 10 are diagrams showing a third embodiment of the present invention. In this embodiment, the first recess 60 has a quadrangular prism shape, while the second recess 61 has a semicircular cross section taken along a plane perpendicular to the tilt line L, and the tilt line L
The cross section taken along the plane including is rectangular and the overall shape is semi-cylindrical. In this case, the columnar portion 63 of the fulcrum member 62 also has a quadrangular prism shape, and the curved surface portion 64 also has a semi-cylindrical shape.

FIG. 11 is a diagram showing a fourth embodiment of the present invention. In this embodiment, the step surface 58 on the back surface 55 of the swash plate 51 is eliminated, the third and fourth flat surfaces 56, 57 are directly intersected with each other at the angle A, and the fixing plate 37 is omitted so that the plate 31 itself. A step is formed on the surface, and a step surface 34 and first and second flat surfaces 35 and 36 are formed.

In the above embodiment, the first and second
The flat surfaces 35 and 36 are parallel to each other, and the third and fourth flat surfaces 56,
Although 57 is made to intersect at a predetermined angle A, in the present invention, the first and second flat surfaces 35 and 36 are made to intersect at a predetermined angle A, and the third and fourth flat surfaces 56 and 57 are made parallel to each other. Good. Furthermore, although the present invention is applied to the fluid motor 21 in the above-described embodiments, the present invention may be applied to a fluid pump.

[0021]

As described above, according to the present invention, it is easy to form the first recess and the fulcrum member and change the position of the tilting straight line, and suppress the depression of the first recess formed in the casing. can do.

[Brief description of drawings]

FIG. 1 is a front sectional view showing a first embodiment of the present invention.

FIG. 2 is a front sectional view in the vicinity of a swash plate.

FIG. 3 is a side view of the vicinity of the plate.

FIG. 4 is a side view of a swash plate.

FIG. 5 is a front view of a fulcrum member.

FIG. 6 is a side view of the vicinity of a plate showing a second embodiment of the present invention.

FIG. 7 is a side view of a swash plate.

FIG. 8 is a side view of the vicinity of a plate showing a third embodiment of the present invention.

FIG. 9 is a side view of a swash plate.

FIG. 10 is a perspective view of a fulcrum member.

FIG. 11 is a front sectional view in the vicinity of a swash plate showing a fourth embodiment of the present invention.

[Explanation of symbols]

 21 ... Swash plate type fluid motor 32 ... Opposing surface 33 ... Casing 34 ... Step surface 35 ... First flat surface 36 ... Second flat surface 38 ... Cylinder block 40 ... Plunger 51 ... Swash plate 52 ... Inclined surface 54 ... Thin portion 55 ... Back surface 60 ... First concave portion 60a ... Side surface 60b ... Bottom surface 61 ... Second concave portion 62 ... Support member 63 ... Columnar portion 63a ... Side surface 63b ... One end surface 64 ... Curved surface portion 82 ... Piston L ... Tilt line F, G ... Tilt position

Claims (1)

[Claims] 1. A thin wall portion 54 of a swash plate 51 is provided with a piston from the rear surface 55 side.
The swash plate is supported by the casing 33 by being pressed by 82.
By tilting the tilting straight line L connecting the individual fulcrum members 62 between the two tilting positions F and G, the plunger 40 in the cylinder block 38 slidingly contacting the tilted surface 52 of the swash plate.
Swash plate type fluid pump designed to change the stroke of
In the motor 21, the facing surface 32 of the casing facing the back surface of the swash plate is provided with a step surface 34 located near the tilt line.
And a first flat surface located closer to the thin portion of the swash plate than the step surface
A second flat surface 36 located on the thicker portion side of the swash plate than the step surface and projecting to the swash plate side from the first flat surface, and on the tilt line. Two flat first recesses 60 are formed apart from each other on the flat surface, the side surface 60a is a vertical surface, and the bottom surface 60b is on the same surface as the first flat surface. The second concave portion 61 having a substantially semicircular cross section taken along a plane perpendicular to the tilting line on the back surface of the swash plate on the rolling line 61
Two columnar portions facing the first recess, and further having a side surface 63a on one side of each of the fulcrum members that makes surface contact with the vertical side surface and a flat end surface 63b that makes surface contact with the bottom surface. In addition to forming 63, a curved surface portion 64 having a substantially semicircular cross section cut on a plane perpendicular to the tilting straight line is formed on the other side, and a part of the columnar portion of these fulcrum members is formed in the first concave portion and the curved surface portion is formed. Swash plate type fluid pump characterized by being inserted into the second recess
motor.