JPH07332221A - Fluid pressure generating device - Google Patents

Abstract

PURPOSE:To prevent separation of cradle swash plate from a swash plate support member without increasing the size of a casing. CONSTITUTION:In an electric motor integral type fluid pressure generating device wherein a cylinder block 7 having a plurality of pistons 5 is incorporated in the rotor 3 of an electric motor 4, an arcuate groove 41 concentric to the inclination center of the swash plate 12 is formed in one of the cradle swash plate 12 and the swash plate support member 16 of the electric motor integral type fluid pressure generating device and an engaging body 42 engaged with the arcuate groove 41 is arranged at the other to lock axial movement of the swash plate 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluid pressure generator, and more particularly to a fluid pressure generator integrated with an electric motor in which a cylinder block having a plurality of pistons is incorporated in a rotor of the electric motor.

[0002]

2. Description of the Related Art Conventionally, a motor-integrated fluid pressure generator in which a cylinder block is incorporated in a rotor of an electric motor has been proposed as disclosed in Japanese Patent Laid-Open No. 6-58251.

In this fluid pressure generator, as shown in FIG. 11, a fitting hole H is formed at the center of the rotor R of the electric motor M.
In the fitting hole H, a cylinder block CB having a main shaft D at the center and a cylinder C in which a piston P is slidably mounted on the outer periphery is inserted and fixed, and a stator ST of the electric motor M is provided. Is fixedly inserted into the body B of the casing MC, and the main shaft D is rotatably supported by the front cover FC and the end cap EC fixed to the body B via bearings SB, while being attached to the end cap EC. Although not shown, the valve plate VP is provided with an intake passage and a discharge passage, and the front cover FC
In addition, the head PH of the piston P is provided with a cradle swash plate SP having an inclined surface F in sliding contact with the shoe SH.

The cradle swash plate SP has a concave cylindrical receiving surface G provided on the front cover FC or a swash plate receiving member fixed to the front cover FC so that the inclination angle of the inclined surface F can be adjusted. An operation piece K which is supported and extends to the back side is provided, a spring S for urging the swash plate SP in the direction of the maximum inclination angle is provided on one side of the extension portion of the operation piece K, and the other side is provided with the operation piece K. A control plunger CP for adjusting the swash plate SP toward the neutral position is provided, the swash plate SP is tilted by operating the control plunger CP, and the discharge amount can be changed by adjusting the tilt angle. ing.

Therefore, in the above structure, when power is supplied to the stator ST and the rotor R is driven to rotate, the cylinder block CB rotates, and this rotation causes the piston P to reciprocate in the cylinder C, The forward movement sucks fluid from the suction passage A and the suction port of the valve plate VP into the cylinder C, and the backward movement pressurizes the sucked fluid, and the pressurized fluid is discharged from the discharge port of the valve plate VP to the discharge passage. By repeating the discharge cycle, it is possible to obtain a fluid pressure generating device which can effectively reduce the size of the entire device and can be simply constructed.

In FIG. 11, OR is the casing M.
An internal space E of the casing MC is a hermetically sealed space by an O-ring provided between the body B of C and the front cover FC and the end cap EC.

Further, L is an extraction hole for extracting a lead wire from the coil end of the stator ST.

[0008]

The cradle swash plate SP in the fluid pressure generator having the above-described structure
Is provided with a convex cylindrical surface N on the back surface thereof.
Is merely fitted to the concave cylindrical receiving surface G provided on the front cover FC or the swash plate receiving member, so that the pressure inside the bore of the cylinder C is steadily passed through the piston P and the shoe SH during steady operation. Since the cylindrical surface N is transmitted to the swash plate SP and the cylindrical surface N is pressed against the cylindrical receiving surface G, the swash plate SP does not come off from the cylindrical receiving surface G, but at the time of assembly or when the swash plate is sharp. There was a risk of separation during tilting motion. To solve this problem, it is sufficient to provide the casing MC with a separation prevention structure. However, in the electric motor integrated fluid pressure generating device in which the cylinder block CB is incorporated in the rotor R of the electric motor M, the swash plate SP is used. Since the coil end of the stator ST is disposed outside the outer periphery of the casing ST, this coil end becomes an obstacle, and therefore, it cannot be incorporated unless the axial length of the casing MC is extended. This imposes restrictions on the design, and also causes a problem that the axial length of the casing MC becomes long, which makes it difficult to apply it to the electric motor-integrated fluid pressure generator.

An object of the present invention is to provide a motor-integrated fluid pressure generator capable of reducing the size of the entire apparatus, but to prevent the cradle swash plate from being accidentally detached without increasing the size of the casing. There is a point to do.

[0010]

In order to achieve the above object, the invention according to claim 1 has a fitting hole 3a provided in a rotor 3 of an electric motor 4 installed in a casing 1, and a main shaft 8 at a central portion thereof. Further, a cylinder block 7 having a plurality of cylinders 6 in which a piston 5 is slidably mounted on the outer peripheral portion is inserted and fixed, and the main shaft 8 is supported by a stationary member including the casing 1, and the cylinder block 7 Of the inclined surface 12a facing the head portion 5a of the piston 5 on one side in the axial direction of the
A cradle swash plate 12 having a cylindrical surface 12c, 12d for adjusting the inclination angle of the inclined surface 12a is provided on the back surface so that the inclination angle can be adjusted, and the valve plate 13 is provided on the other side in the axial direction.
And a swash plate 12,
An arc groove 41 concentric with the tilt center of the swash plate 12 is provided on one side of the swash plate receiving member 16 having a cylindrical receiving surface 16a for receiving the swash plate 12, and the other side of the arc groove 41 is engaged with the arc groove 41. The mating engagement body 42 is provided to lock the axial movement of the swash plate 12.

According to the second aspect of the present invention, the casing 1 is integrally provided with the swash plate receiving member 16, and the standing wall 43 is provided so as to be adjacent to the cylindrical receiving surface 16a of the swash plate receiving member 16. The standing wall 43 is provided with one of the arcuate groove 41 and the engaging body 42. Further, according to the invention of claim 3, one of the cradle swash plate 12 and the swash plate receiving member 16 of the swash plate 12 is provided. A first arc surface 44 concentric with the tilt center is provided, and one of the swash plate 12 and the swash plate receiving member 16 has a second arc surface 45 facing the arc surface 44. A groove forming member 46 that forms an arcuate groove 41 with the groove 44.
Was joined.

[0012]

According to the first aspect of the invention, in the electric motor integrated fluid pressure generator in which the cradle swash plate 12 is provided so that the tilt angle can be adjusted, the swash plate 12 and the swash plate receiving member for receiving the swash plate 12 are provided. 16 is provided with an arc groove 41 concentric with the tilt center of the swash plate 12, and the engaging body 42 is provided on the other side.
Is provided and the axial movement of the swash plate 12 is locked by engaging the engaging body 42 with the arcuate groove 41. Therefore, the swash plate 12 is placed inside the coil end of the stator 2 of the electric motor 4. Even if the casing 1 is made to intervene, the separation of the swash plate 12 can be effectively prevented without increasing the axial length of the casing 1 to make it large.

Therefore, it is possible to maintain the characteristics of the electric motor-integrated fluid pressure generating device which can be downsized by incorporating the cylinder block 7 into the rotor 3 of the electric motor 4, and also the swash plate 12 can be maintained.
It is possible to prevent the swash plate 12 from coming off without giving any trouble to the adjusting function due to the tilting of the.

According to the second aspect of the present invention, the swash plate receiving member 16 is formed integrally with the casing 1, and the standing wall 43 is provided on the casing 1.
Since the circular arc groove 41 or the engaging body 42 is provided in the above, the number of parts can be reduced, and the labor for fixing a separately provided swash plate receiving member can be omitted, and the positional accuracy of the cylindrical receiving surface 16a with respect to the main shaft 8 is good. You can do it.

According to the third aspect of the invention, the swash plate 12 or the swash plate receiving member 16 is provided with the first arc surface 44 and the groove forming member 46 having the second arc surface 45. Since the arcuate groove 41 is formed by being combined with each other, the arcuate groove 41 can be easily formed. Further, when the engaging body 42 is engaged with the arcuate groove 41, the groove forming member 46 is formed. Since it can be done before joining, the engaging body 4
Even if 2 is formed integrally with the other of the swash plate 12 and the swash plate receiving member 16, it can be easily engaged with the arc groove 41.

Therefore, it is not necessary to form the engaging body 42 by another member such as a stop bolt, and the engaging body 42 can be formed integrally with the swash plate 12 or the swash plate receiving member 16.

[0017]

Embodiment In the embodiment shown in FIG. 1, an end cap 1b is integrally provided on one side of a body 1a and a front cover is provided on the other side.
An electric motor 4 composed of a stator 2 and a rotor 3 is installed in an internal space 1d of a casing 1 to which 1c is attached, and a fitting hole 3a is provided at the center of the rotor 3, and the fitting hole 3a is formed.
A cylinder block 7 having a plurality of cylinders 6 in which a piston 5 is slidably mounted in the center is inserted and fixed by press fitting or shrink fitting, and a shaft hole 7a is provided in the center of the cylinder block 7. The main shaft 8 is slide-bearing 9 in the lever shaft hole 7a.
Is rotatably supported via the end cap 1b and the front cover -1c via bearings 10 and 11 formed of, for example, needle bearings, and the front shaft is supported. A piston actuating body 12 (hereinafter referred to as a swash plate), which is a cradle swash plate having an inclined surface 12a facing the head 5a of the piston 5, is provided inside the center of the cover-1c so that the inclination angle can be adjusted. A valve plate 13 having an arcuate suction port 13a and a discharge port 13b is mounted inside the center of the end cap 1b, and the end cap 1b has a suction passage 14 communicating with the suction port 13a and the discharge port 13b. A discharge passage 15 is provided so that the rotor 3 can be rotated to the casing 1 via the cylinder block 7 and the main shaft 8. It is those that support the.

More specifically, the end cap 1b will be described.
Has a bulging part that protrudes inward at its center,
The bearing 10 is provided on the bulging portion and the bearing 1
0 and the suction passage 14 and the discharge passage 1 on both sides in the radial direction.
5 is provided, and the valve plate 13 is attached to the inner surface of the bulging portion by a fixing pin (not shown).
Further, the bearing 1 is provided at the center of the front cover-1c.
1 and a swash plate receiving member 1 having a concave cylindrical receiving surface 16a for receiving and supporting the swash plate 12 on the inner surface of the central portion.
6, urging means 17 for urging the swash plate 12 in the maximum inclination angle direction and a control plunger 1 for adjusting the swash plate 12 toward the neutral position are provided on both sides of the swash plate receiving member 16 in the radial direction.
8 are provided in the axial direction of the main shaft 8. still,
The urging means 17 of the embodiment shown in FIG. 1 is composed of an operation plunger 19 for pressing the swash plate 12 in the maximum inclination angle direction by the action of the discharge pressure and a spring 20.

That is, the front bearing -1c sandwiches the bearing 11 of the main shaft 8 on one side in the radial direction, that is, on one side of the swash plate receiving member 16, and the plunger bearing parallel to the axial direction of the main shaft 8 is provided. A hole 21 and a spring chamber 22 continuous with the plunger receiving hole 21 are provided, and a plug 23 is screwed on the back surface of the spring chamber 22 to seal the spring chamber 22. The operation plunger 19 is supported so as to be capable of reciprocating in the axial direction of the main shaft 8, and the spring 20 is housed in the spring chamber 22 to provide the operation plunger 19.
Is moved toward the swash plate 12, that is, in the maximum inclination angle direction of the swash plate, and the spring chamber 22
The discharge pressure passage 24, which communicates with the discharge passage 15 and is formed inside the body 1a and the front cover-1c, is opened, and a large diameter portion 19a is provided at the tip of the operation plunger 19. , The large diameter portion 19a is attached to the swash plate 1
The back surface of 2 is contacted via the contact body 25.
The discharge pressure passage 24 may be formed by an external pipe.

On the other hand, the control plunger 18 drives the swash plate 12 to tilt from the maximum tilt angle position toward the neutral position. The control plunger 18 sandwiches the bearing 11 of the main shaft 8 in the front cover-1c on the other side. , That is, the swash plate receiving portion 1
6, on the other side, at a position symmetrical to the biasing means 17, the main shaft 8
The plunger hole 26 parallel to the axial direction of the
The control plunger 18 is installed in the plunger hole 26 such that the control plunger 18 can reciprocate in the axial direction of the main shaft 8. The main shaft 8 is attached to the contacting portion.
The contact body 27 is brought into contact with the symmetric position sandwiched by.

An operating portion 28a for adjusting the maximum inclination angle of the swash plate 12 is provided at the center of the plunger hole 26.
The adjustment rod 28 having the
Is projected to the outside from the front cover-1c, and a lock nut 29 is screwed onto this protruding portion so that it can be locked at a predetermined adjustment position.

A control pressure passage 31 communicating with a control pressure generating device is opened in the back chamber 30 of the control plunger 18 installed in the plunger hole 26, and a small pressure is provided at the tip side of the back chamber 30. A drain hole 32 is provided.

Therefore, with the above structure, the control pressure passage 31 is formed.
A control fluid is supplied from the swash plate 1 by moving the control plunger 18 forward against the urging means 17.
The tilt angle of No. 2 can be adjusted from the maximum tilt angle position shown in FIG. 1 toward the neutral position. By this adjustment, the discharge amount of the fluid discharged to the discharge passage 15 by the reciprocating movement of the piston 5 is made variable. Of.

The swash plate 12 whose inclination angle is adjusted as described above is provided with an insertion hole 12b for the main shaft 8 at the center as shown in FIGS. 3 to 5, and the inclined surface 12 is provided on the surface.
a is provided, and convex cylindrical surfaces 12c and 12d are provided on both sides of the insertion hole 12b on the back surface. The convex cylindrical surfaces 12c and 12d are fitted to the concave cylindrical receiving surface 16a of the swash plate receiving member 16. The swash plate 12 and the swash plate receiving portion 1
6, while being supported via the slide bearing 40, between the cylindrical surfaces 12c and 12d, on both sides of the insertion hole 12b,
Input portions 12e, 12f having mounting holes 12g, 12h for the contact bodies 25, 27 are provided.
The contact bodies 25 and 27 are fixed to 2f by press fitting.

The contact bodies 25, 27 are made of wear-resistant material, and the contact surfaces of the operation plunger 19 and the control plunger 18 are in an arc shape so as not to be easily worn, and are integrated with the contact bodies 25, 27. The mounting shafts 33 and 34 provided in the above are press-fitted and fixed to the input portions 12e and 12f.

On the other hand, the swash plate receiving member 16 for receiving the swash plate 12 may be provided separately from the front cover-1c, but in the embodiment of FIG. 1, it is provided integrally with the front cover-1c. Inside, the convex cylindrical surface 12c of the swash plate 12
Is provided with the concave cylindrical receiving surface 16a.

More specifically, the front cover -1c
As shown in FIGS. 7 to 9, the bearing 11 provided in the central portion is sandwiched and the swash plate receiving members 16 are integrally provided in a bulged manner on both sides in the radial direction. The recessed cylindrical receiving surface 16a is provided in the swash plate receiving member 16, and the plunger receiving hole 21 and the plunger hole 26 are provided between the swash plate receiving members 16 symmetrically with the bearing 11 interposed therebetween.

In the embodiment shown in FIG. 1, arcuate grooves 41 concentric with the tilt center O of the swash plate 12 are provided on both side surfaces of the swash plate 12, and the front cover-1c is provided.
Is provided with a pair of standing walls 43 adjacent to the concave cylindrical receiving surface 16a of the swash plate receiving member 16, and the screw holes 4 are formed in the standing walls 43.
7 is provided, and an engaging body 42 formed of a stop bolt that engages with the circular arc groove 41 is provided in the screw hole 47.
It is screwed so as to project toward a, and the engagement body 42 is engaged with the circular arc groove 41 to lock the axial movement of the swash plate 12 while maintaining the tilting function of the swash plate 12. It is designed to prevent disengagement during a sudden tilting motion.

In the above construction, the cylinder block 7 is formed in a cylindrical shape, the main shaft 8 is inserted into the shaft hole 7a at the center of the cylinder block 7, and the cylinder 6 is arranged radially outside the shaft hole 7a. The valve plate side is provided with a kidney-shaped port that communicates with or cuts off the suction port 13a and the discharge port 13b.
The head 5a of the piston 5 slidably mounted in the cylinder 6 holds a shoe 35 that slides on the inclined surface 12a of the swash plate 12, and these shoes 35 are retained by the retainer 36.
The main shaft 8 is provided with an engaging portion 37 that engages with an engaged portion 36a having a spherical inner surface provided in the center of the retainer 36.

Then, the cylinder block 7 and the main shaft 8
Between the cylinder block 7 and the valve plate 13 and the shoe 35 against the inclined surface 12a through the main shaft 8 and the retainer 36 so as not to separate from each other. The elastic body 38 is interposed.

Next, the operation of the embodiment configured as described above will be described. When power is supplied to the stator 2 and the rotor 3 rotates, the cylinder block 7 also slides on the slide bearing 9
The piston 5 reciprocates on the inclined surface 12a via the shoe 35 and reciprocates on the inclined surface 12a by the rotation of the main shaft 8 through the suction passage 1.
4 and the suction port 13a of the valve plate 13, the fluid is sucked from the kidney-shaped port to the cylinder 6, and the fluid sucked by the backward movement is pressurized,
It is discharged from the kidney-shaped port to the discharge passage 15 through the discharge port 13b of the valve plate 13.

By repeating this suction / discharge cycle, fluid pressure, mainly hydraulic pressure can be generated. For example, as the fluid pressure rises due to an increase in load, the control pressure acts on the control plunger 18. By tilting the swash plate 12 toward the neutral position and adjusting the tilt angle, the discharge flow rate can be controlled.

Further, the arcuate groove 41 of the swash plate 12 is
Further, since the swash plate receiving member 16 is provided with the engaging bodies 42 and the engaging bodies 42 are engaged with the arcuate groove 91, the tilting function of the swash plate 12 can be maintained, and the inclination angle thereof can be maintained. The movement of the swash plate 12 in the axial direction is controlled by the operation of the control plunger 18, while the swash plate 12 moves in the axial direction.
The amount of the gap between the swash plate 12 and the engaging body 42 is suppressed, so that it is possible to effectively prevent the swash plate 12 from being unintentionally disengaged during assembly or during a sudden tilting operation. Moreover, the arc groove 41
Is provided on the side surface of the swash plate 12, and the engaging body 42 is provided on the standing wall 43. Therefore, in the electric motor integrated fluid pressure generating device in which the cylinder block 7 is incorporated into the rotor 3 of the electric motor 4, the swash plate 12 is provided. Even if the coil 2 of the stator 2 is provided inside the coil end, the swash plate 12 can be prevented from coming off. Therefore, it is not necessary to increase the axial length of the casing 1, and as a result, the device can be downsized. The characteristics of can be maintained.

In the embodiment described above, the arc groove 4 is used.
1 is provided on the side surface of the swash plate 12 and the engaging body 42 is provided on the standing wall 43, the arc groove 41 is provided on the standing wall 43, and the engaging body 42 is provided on the side surface of the swash plate 12 so as to project. You may.

When the arc groove 41 is formed in the standing wall 43 of the swash plate 12 or the swash plate receiving member 16,
Although it may be partially provided as shown in FIG. 5, it is provided over the entire length of the cylindrical surface 12c, 12d or the concave cylindrical receiving surface 16a as shown in FIG. 6, and both ends thereof are provided as the cylindrical surface 12c, 12d.
Alternatively, it may be opened at the end of the cylindrical receiving surface 16a.

Further, the cylindrical surfaces 12c, 12 of the swash plate 12 are
Although d is convex and the cylindrical receiving surface 16a of the swash plate receiving member 16 is concave, it may be reversed.

Further, when the circular arc groove 41 is formed, it may be formed by shaving in a concave groove shape on the side surface of the swash plate 12 or the inner surface of the standing wall 43, but as shown in FIG. 10, for example, the swash plate receiving member. Sixteen standing walls 43 are provided with a concave first arc surface 44 which is concentric with the center of the swash plate 12 and a flat receiving surface 48, and a convex shape which opposes the first arc surface 44. Second
A groove forming member 46 having an arcuate surface 45 is provided, and both ends of the groove forming member 46 are connected to the receiving surface 48 by fixing bolts 49 so that the groove between the first arcuate surface 44 and the second arcuate surface 45. Alternatively, the arcuate groove 41 may be formed.

By doing so, when the engaging body 42 is joined to the arc groove 41, the engaging body 42 is positioned at the groove forming portion before the arc groove 41 is formed, and the groove forming member 46 is placed in that state. By coupling, the engagement body 42 can be engaged with the arcuate groove 41, so that this engagement can be facilitated, and the engagement body 42 can be formed by another member such as a stop bolt as in the above-described embodiments. It is possible to integrally form the swash plate 12 or the swash plate receiving member 16 without the need to form it.

[0039]

According to the first aspect of the present invention, in the fluid pressure generating device integrated with an electric motor in which the cradle swash plate 12 is provided so that the inclination angle can be adjusted, the swash plate 12 and the swash plate for receiving the swash plate 12 are provided. A circular arc groove 41 concentric with the tilt center of the swash plate 12 is provided on one side of the receiving member 16, and the engaging body 42 is provided on the other side, and the engaging body 42 is engaged with the circular arc groove 41. Since the axial movement of the swash plate 12 is locked by the above, the axial length of the casing 1 is increased even if the swash plate 12 is interposed in the coil end of the stator 2 of the electric motor 4. It is possible to effectively prevent the swash plate 12 from coming off without making it large in size.

Therefore, it is possible to maintain the characteristics of the fluid pressure generator integrated with the electric motor, which can be miniaturized by incorporating the cylinder block 7 into the rotor 3 of the electric motor 4, and the swash plate 12 can be used.
It is possible to prevent the swash plate 12 from coming off without giving any trouble to the adjusting function due to the tilting of the.

According to the second aspect of the present invention, the swash plate receiving member 16 is integrally formed with the casing 1, and the casing 1 is provided with the standing wall 43.
Since the circular arc groove 41 or the engaging body 42 is provided in the above, the number of parts can be reduced, and the labor for fixing a separately provided swash plate receiving member can be omitted, and the positional accuracy of the cylindrical receiving surface 16a with respect to the main shaft 8 is good. You can do it.

According to the third aspect of the invention, the swash plate 12 or the swash plate receiving member 16 is provided with the first arc surface 44 and the groove forming member 46 having the second arc surface 45. Since the arcuate groove 41 is formed by being combined with each other, the arcuate groove 41 can be easily formed. Further, when the engaging body 42 is engaged with the arcuate groove 41, the groove forming member 46 is formed. Since it can be done before joining, the engaging body 4
Even if 2 is formed integrally with the other of the swash plate 12 and the swash plate receiving member 16, it can be easily engaged with the arc groove 41.

Therefore, it is not necessary to form the engaging body 42 by another member such as a stop bolt, and the engaging body 42 can be formed integrally with the swash plate 12 or the swash plate receiving member 16.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of the device of the present invention,

FIG. 2 is a partial cross-sectional view across the cradle swash plate in FIG.

FIG. 3 is a front view of the cradle swash plate.

FIG. 4 is a rear view of the same.

FIG. 5 is a right side view of the same.

FIG. 6 is a right side view showing another embodiment of the cradle swash plate.

FIG. 7 is a front view seen from the inside of the front cover.

8 is a cross-sectional view taken along the line AA of FIG.

9 is a sectional view taken along line BB of FIG.

FIG. 10 is an explanatory view showing another embodiment of forming a circular arc groove.

FIG. 11 is a vertical sectional view showing a conventional example.

[Explanation of symbols]

1 Casing 3 Rotor 3a Fitting hole 4 Electric motor 5 Piston 5a Head 6 Cylinder 7 Cylinder block 8 Main shaft 12 Cradle swash plate 12a Inclination angle 12c, d Cylindrical surface 13 Valve plate 16 Swash plate receiving member 16a Cylindrical receiving surface 41 Arc groove 42 Engaging body 43 Standing wall 44 First arc surface 45 Second arc surface 46 Groove forming member

Claims (3)

[Claims] 1. A main shaft (8) is provided at the center of a fitting hole (3a) provided in a rotor (3) of an electric motor (4) installed in a casing (1), and a piston (5) is provided at an outer peripheral portion. A cylinder block (7) having a plurality of cylinders (6) slidably installed therein is inserted and fixed to support the main shaft (8) on a stationary member including the casing (1), and A cylindrical surface (12c) having an inclined surface (12a) facing the head (5a) of the piston (5) on one axial side of 7) and adjusting the inclination angle of the inclined surface (12a) on the back surface. Cradle swash plate with (12d) (1
In the fluid pressure generating device in which the inclination angle is adjustable and the valve plate (13) is provided on the other side in the axial direction, the swash plate (12) and a cylindrical receiving surface (2) for receiving the swash plate (12) are provided. 16a) with one of the swash plate receiving member (16),
Arc groove (41) concentric with the tilt center of the swash plate (12)
And an engaging body (42) that engages with the circular arc groove (41) is provided on the other side to lock the axial movement of the swash plate (12). 2. A casing (1) is provided with a swash plate receiving member (1).
6) is integrally provided, and a standing wall (43) is provided so as to be adjacent to the cylindrical receiving surface (16a) of the swash plate receiving member (16),
The fluid pressure generating device according to claim 1, wherein one of the arc groove (41) and the engaging body (42) is provided in the standing wall (43). 3. A first arc surface (44) concentric with the tilt center of the swash plate (12) is provided on one of the cradle swash plate (12) and the swash plate receiving member (16). One of the swash plate (12) and the swash plate receiving member (16) has a second arc surface (45) facing the arc surface (44), and an arc is formed between the second arc surface (44) and the first arc surface (44). 2. A fluid pressure generator according to claim 1, further comprising a groove forming member (46) forming a groove (41).