JPH07332220A - Fluid pressure generating device - Google Patents

Abstract

PURPOSE:To perform lead-out of a lead wire as the internal space of a casing is effectively sealed, to prevent leakage of liquid from the internal space, and also to facilitate correction of a connection error. CONSTITUTION:In an electric motor integral type fluid pressure generating device wherein a cylinder block 7 having a plurality of pistons 5 is integrated in the rotor 3 of an electric motor 4, a connection terminal assembly 50 comprising a fixed board 51 and a terminal board 55 having a plurality of terminals 52, 53, and 54 and fixed in a sealed state to the fixed board 51 is provided. The assembly 50 is removably attached to the lead wire connection port 56 of a casing 1 in which the electric motor 5 is mounted.

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.

As shown in FIG. 6, this fluid pressure generator has a fitting hole H at the center of a rotor R of an electric motor M, and the fitting hole H has a main shaft D at the center and an outer periphery. A cylinder block CB having a cylinder C in which a piston P is slidably mounted is inserted and fixed, a stator ST of the electric motor M is inserted and fixed to a body B of a casing MC, and the spindle D is attached to the body. Front cover fixed to B
The FC and the end cap EC are rotatably supported via bearings SB, while the valve plate VP is attached to the end cap EC, and a suction passage A and a discharge passage (not shown) are provided. Cover F
C is provided with a cradle swash plate SP having an inclined surface F with which the head PH of the piston P slides and contacts via a shoe SH.

On the other hand, in the casing MC, a lead wire lead-out hole L drawn out from the coil end of the stator ST is provided.
Is provided so that the lead wire is pulled out from the lead-out hole L, and an O-ring or the like is provided between the body B of the casing MC, the front cover FC, and the end cap EC. A sealing material OR is provided to make the internal space E a sealed space. In FIG. 6, MG is a magnet that attracts foreign matter such as abrasion powder floating in the internal space E.

[0005]

In the above structure, the lead wire is pulled out to the outside through the lead hole L, and the lead wire is pulled into the lead hole L. A rear sealing material is injected to form a hermetically sealed structure, but the hermetically sealed interior space E is incomplete, and the body B and the front cover FC and the end cap EC are not completely sealed. Between the sealing material O
In spite of the provision of R to make the internal space E a sealed space, there is a problem that fluid leakage from the extraction hole L, that is, leakage of the lubricating oil sealed in the internal space E occurs.
Further, when there is a three-phase connection error at the coil end in the stator ST and this connection is to be corrected, it is necessary to disassemble the front cover FC or the end cap EC from the body B, and the correction is made. After that, reassembly was necessary, which made it difficult to correct connection errors.

An object of the present invention is to allow the lead wire to be drawn out while effectively sealing the internal space of the casing, to prevent fluid leakage from the internal space, and to easily correct any wiring error. The point is to be able to.

[0007]

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.
Further, a cylinder block 7 having a plurality of cylinders 6 in which the piston 5 is slidably mounted on the outer periphery is inserted and fixed, and the main shaft 6 of the cylinder block 7 is supported by a stationary member including the casing 1. At the same time, a piston actuating body 12 having an inclined surface 12a facing the head 5a of the piston 5 is provided on one axial side of the cylinder block 7, and a valve plate 13 is provided on the other axial side to generate fluid pressure. In the device, a fixed board 51 and a plurality of terminals 52, 5
A connection terminal assembly 50 having a terminal board 55, which has a fixed terminal 51 and a fixed board 51, is provided on the fixed board 51. The fixed board 51 of the assembly 50 is provided on the casing 1 with a lead wire connection port 56. It was detachably attached to.

According to the second aspect of the present invention, a lead wire connection port 56 that opens toward the side is provided at a side portion of the body 1a of the casing 1, and the connection terminal assembly 50 is provided at the connection port 56. The fixed plate 51 was detachably attached.

[0009]

In the invention according to claim 1, the rotor 3 of the electric motor 4 is
A motor-integrated fluid pressure generator in which the cylinder block 7 is incorporated in a casing 1 of the motor 4.
Since the connection terminal assembly 50 having the fixed board 51 and the terminals 52 to 54 is provided in the above, and the assembly 50 is attached to the lead wire connection port 56 of the casing 1, the lead wire connection port 56 is A sealed structure can be provided and fluid leakage from the internal space 1d of the casing 1 can be prevented.

Moreover, the assembly 50 has the connection port 56.
Since it is removably attached, even if there is an error in the lead wire connection, it is possible to remove the assembly 50 and correct it. Therefore, it is possible to easily correct the connection error.

According to the second aspect of the invention, since the connection port 56 is opened laterally to the side portion of the body 1a of the casing 1, the inclined surface of the piston actuating body 12 is provided in the casing 1. Even when a variable capacitance mechanism having an adjustable tilt angle of 12a is incorporated, the lead wire can be drawn out without being affected by the variable capacitance mechanism, and the variable capacitance can be increased without increasing the space in the internal space 1d of the casing 1. The mechanism can be incorporated, the electric motor 4 can be incorporated in the body 1a in advance, and the lead wire can be pulled out without difficulty.

[0012]

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.
1c is attached via O-ring 100, and internal space 1d
An electric motor 4 including a stator 2 and a rotor 3 is housed in the internal space 1d of a casing 1 having a sealed shape, 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. Then, the main shaft 8 is rotatably supported in the shaft hole 7a via the slide bearing 9, and the main shaft 8 is mounted on the end cap 1b and the front cover-1c by bearings 10 and 11 made of, for example, needle bearings. A piston actuating body 12 (hereinafter referred to as a slanted body) rotatably supported via a cradle swash plate having an inclined surface 12a facing the head 5a of the piston 5 inside the central portion of the front cover-1c. A plate) is provided so that the tilt angle can be adjusted,
Inside the center of the end cap 1b, a valve plate 13 having an arc-shaped suction port 13a and a discharge port 13b is attached, and the end cap 1b is
A suction passage 14 and a discharge passage 15 which communicate with the suction port 13a and the discharge port 13b are provided, and the rotor 3 is provided.
Is rotatably supported by the casing 1 via the cylinder block 7 and the main shaft 8.

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 11 is provided at the center of the front cover-1c, and a swash plate receiving member 16 having a concave cylindrical receiving surface 16a for receiving and supporting the swash plate 12 is provided on the inner surface of the center. The convex cylindrical surface 12b provided on the back surface of the swash plate 12 is supported by the slide bearings 40, and the swash plate 12 is urged to both sides of the swash plate receiving member 16 in the maximum inclination angle direction. The urging means 17 and the control plunger 18 for adjusting the swash plate 12 toward the neutral position are provided in the axial direction of the main shaft 8 to form a variable displacement mechanism. 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 is sandwiched with 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 received. 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.
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 in 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
It is brought into contact with the back surface of 2 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 be tilted 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 and the other side. That is, the swash plate receiving portion 16
On the other side of the main shaft 8 at a position symmetrical to the biasing means 17.
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 protruded from the front cover-1c to the outside, and a lock nut 29 is screwed onto the protruding portion so that the lock nut can be locked at a predetermined adjustment position.

Further, 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 on 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.
2 is adjusted from the maximum tilt angle position shown in FIG. 1 toward the neutral position, and the discharge amount discharged to the discharge passage 15 by the reciprocating movement of the piston 5 is made variable by this adjustment. .

In the above construction, the cylinder block 7 has 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 is pressed 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.

Therefore, in the present invention, in the electric motor-integrated fluid pressure generating device configured as described above, the electric motor 4
The lead wires U, V, W connected to the coil ends of the stator 2 are drawn out from the internal space 1d to the outside as follows. In the embodiment shown in FIG. 1, a lead wire connection port 56 that opens to the side is provided on the side of the front cover side of the body 1a of the casing 1, and the connection port 56 is connected to the connection described below. Terminal assembly 5
0 was attached detachably. As shown in FIGS. 2 and 3, the lead wire connection port 56 is formed by providing a mounting seat 57 of the assembly 50 on the body 1a in a protruding shape, and forming a plurality of screw holes 58 in the mounting seat 57. It is provided.
Further, as shown in FIGS. 4 and 5, the connection terminal assembly 50 includes a fixed plate 51 that is detachably attached to the attachment seat 57 via a plurality of bolts 59, and the lead wires U, V, W.
A terminal board 55 having three terminals 52, 53, 54 for connecting to each other and sealingly fixed to the fixed board 51. The fixing board 51 has a mounting hole for the terminal board 55 at the center thereof. 51a is provided, and the fitting groove 51 of the sealing material 60 mainly composed of an O-ring is provided on the outer peripheral portion of the mounting hole 51a.
b around, and a plurality of bolt holes 51c provided on the outside thereof,
The terminal board 55 is fitted into the mounting hole 51a of the fixed board 51 and is fixed in a hermetically sealed manner by welding.

The terminal board 55 has the terminals 5
2, 53, 54 are pierced, and the penetrating portion is mainly filled with a binder 61 such as a glass material and fixed in a hermetically sealed manner, and the outside is covered with an insulating cap 62 such as a rubber cap.

Therefore, after connecting the lead wires U, V, W to the terminals 52, 53, 54 fixed to the terminal board 55, the fixed board 51 to which the terminal board 55 is fixed in a hermetically sealed manner. By tightening the bolts 59 into the screw holes 58, the bolts 59 can be attached to and detached from the mounting seat 57, and when the bolts 59 are mounted, they are sealed by the action of the sealing material 60.

Therefore, when the stator 2 is supplied with electric power and the rotor 3 rotates, the cylinder block 7 also rotates, and this rotation causes the piston 5 to reciprocate, so that the suction passage 14 and the suction port 13a of the valve plate 13 are rotated.
The fluid sucked into the cylinder 6 via the
The fluid is discharged to the discharge passage 15 through the discharge port 13b of the valve plate 13, and fluid pressure, mainly hydraulic pressure is generated by repeating this suction / discharge cycle. , The O-ring 100 interposed between the joint portions of the body 1a and the front cover -1c can be hermetically sealed, and the lead wires U, V, W can be connected to the terminals 52, 53, 54.
While it can be pulled out through the
Since 6 can be hermetically sealed, the lubricating oil sealed in the internal space 1d can be prevented from leaking to the outside. Moreover, since the fixed plate 51 of the assembly 50 is detachably attached to the attachment seat 57, the lead wire U,
Even if there is a wiring error with respect to the coil ends of V and W, by removing the fixed plate 51, the wiring error can be easily corrected, and the work of correcting the wiring error can be easily performed.

In the above embodiment, the connection port 56 is
Is provided on the side portion of the body 1a so as to be opened to the side, so that while incorporating the variable capacity mechanism capable of adjusting the inclination angle of the swash plate 12 into the installation space of the variable capacity mechanism. It is possible to secure a lead-out space for the lead wires U, V, W without any influence, and the electric motor 4 can be incorporated in the casing 1 in advance, and the lead wires U, V, W can be pulled out without difficulty. It can be done.

In the embodiment described above, the end cap 1b is formed integrally with the body 1a, but it may be formed as a separate body, and the lead wire connection port 56 may be formed in the body 1a.
Although it is provided on the side of the body, it may be the head of the body 1a, or
It may be provided on the end cap 1b or the front cover-1c.

Although the swash plate 12 has an adjustable tilt angle, it may be fixed as in the conventional example shown in FIG.

[0028]

According to the first aspect of the present invention, in the electric motor integrated fluid pressure generating device in which the cylinder block 7 is incorporated in the rotor 3 of the electric motor 4, the fixed plate 51 and the Since the connection terminal assembly 50 having the terminals 52 to 54 is provided and the assembly 50 is attached to the lead wire connection port 56 of the casing 1, the lead wire connection port 56 can be made into a hermetically sealed structure, It is possible to prevent fluid leakage from the internal space 1d.

Moreover, the assembly 50 has the connection port 56.
Since it is removably attached, even if there is an error in the lead wire connection, it is possible to remove the assembly 50 and correct it. Therefore, it is possible to easily correct the connection error.

According to the second aspect of the invention, since the connection port 56 is opened laterally at the side portion of the body 1a of the casing 1, the inclined surface of the piston actuating body 12 is provided in the casing 1. Even when a variable capacitance mechanism having an adjustable tilt angle of 12a is incorporated, the lead wire can be drawn out without being affected by the variable capacitance mechanism, and the variable capacitance can be increased without increasing the space in the internal space 1d of the casing 1. The mechanism can be incorporated, the electric motor 4 can be incorporated in the body 1a in advance, and the lead wire can be pulled out without difficulty.

[Brief description of drawings]

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

FIG. 2 is a side view of the casing with the front cover removed.

FIG. 3 is a sectional view taken along line AA of FIG.

FIG. 4 is a front view of the connection terminal assembly seen from the inside.

5 is a cross-sectional view taken along the line BB of FIG.

FIG. 6 is a vertical sectional view showing a conventional example.

[Explanation of symbols]

1 casing 1a
Body 3 Rotor 3a
Fitting hole 5 Piston 5a
Head 6 Cylinder 7
Cylinder block 8 Spindle 12
Piston actuating body 12a Inclined surface 13
Valve plate 50 Connection terminal assembly 51
Fixed board 52 to 54 Terminal 55
Terminal board 56 Lead wire connection port

Claims (2)

[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, and a main shaft (6) of the cylinder block (7) is supported by a stationary member including the casing (1). And the cylinder block (7)
A piston actuation body (1) having an inclined surface (12a) facing the head (5a) of the piston (5) on one axial side of
2) and a fluid pressure generator having a valve plate (13) on the other side in the axial direction, a fixed plate (51) and a plurality of terminals (52) (53) (5)
4), a connection terminal assembly (50) comprising a terminal board (55) that is hermetically fixed to the fixed board (51) is provided, and the fixed board (51) of this assembly (50) is A fluid pressure generator characterized by being detachably attached to a lead wire connection port (56) provided in a casing (1). 2. A lead wire connection port (5) that opens to the side at a side portion of the body (1a) of the casing (1).
6) is provided, and the connection terminal assembly (5
The fluid pressure generator according to claim 1, wherein the fixed plate (51) of (0) is detachably attached.