JP2002276530A - Fluid motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fluid motor that can provide a large rotation region with a resistance smaller than a conventional vane motor (vane type rotary motor), a radial plunger motor, or the like, and has low friction and low abrasion. SOLUTION: This fluid motor comprises an inner rotor 4 having shafts 3A and 3B including a fluid pressure introducing part, an outer rotor 7 including the inner rotor 4 relatively rotatably inside a cam surface 7A having an elliptic inner wall, piston balls 6 that are stored in cylinders 5 radially punched in the inner rotor 4 and can move back and forth between the cam surface 7A of the outer rotor 7 and the deep inner wall surface of the cylinders 5, and a bearing house that has right and left side port walls 8A and 8B faced to each other so as to communicate from the fluid pressure introducing part disposed inside the shafts 3A and 3B to the insides of the cylinders 5 of the inner rotor 4, supports the shafts 3A and 3B rotatably, and grapples and fixes the outer rotor 7 including the inner rotor 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluid motor that performs a continuous rotary motion by utilizing the energy of a viscous fluid such as a hydraulic pressure that is fed under pressure.

[0002]

2. Description of the Related Art Heretofore, there have been vane motors (blade type rotary motors), radial plunger motors and the like as this type of fluid motor device.

[0003]

However, in such conventional vane motors and radial plunger motors, the vane or the plunger slides, but the tip is liable to be worn and the contact area of the vane is large, so that energy loss due to friction is caused. However, there is a problem that the problem is likely to occur.

Accordingly, the present invention has been made in view of the above-described various existing circumstances, and has a wider rotation range with less resistance than conventional vane motors (vane type rotary motors), radial plunger motors and the like. It is an object of the present invention to provide a fluid motor which achieves low friction and low friction.

[0005]

In order to achieve the above object, according to the present invention, shafts (3A, 3A,
B), an inner rotor 4 in which the inner rotor 4 is rotatably mounted inside a cam surface 7A having an elliptical inner wall shape, and a cylinder 5 radially bored in the inner rotor 4. A piston ball 6 which can move back and forth between a cam surface 7A of the outer rotor 7 and an inner wall surface inside the cylinder 5, and a pressurized fluid supply / discharge hole which is opposed to a side surface of the inner rotor 4 to communicate with the cylinder 5. 9 is provided.
Shaft (3) with fluid pressure feed introduction part (PA, PB)
A, 3B), an outer rotor 7 in which the inner rotor 4 is rotatably mounted inside a cam surface 7A having an elliptical inner wall shape, and a cylinder 5 radially bored in the inner rotor 4. And the cam surface 7A of the outer rotor 7
And a piston ball 6 capable of moving back and forth between the inner wall of the cylinder 5 and a fluid pressure feed introduction section (PA, PB) provided inside the shaft (3A, 3B). The left and right side port walls (8
A, 8B), and a bearing house 2 that rotatably supports the shafts (3A, 3B) and clamps and fixes an outer rotor 7 having an inner rotor 4 therein.
Inside the shafts (3A, 3B), fluid pressure feed introduction parts (PA, PB) communicating with the pressurized fluid supply / discharge holes 9 can be provided. During the relative rotation between the inner rotor 4 and the outer rotor 7, the shaft is disposed between the fluid pressure feed introduction portions (PA, PB) of the shafts (3 </ b> A, 3 </ b> B) and the pressurized fluid supply / discharge holes 9 on the side surface of the inner rotor 4. (3A, 3B), two pressurized fluid supply / discharge holes 9 located on opposite sides of each other are communicated with the fluid pressure feeding / introducing portions (PA, PB). Side port wall (8A, 8
B). The groove direction of the side port wall portions (8A, 8B) is inclined at an angle of 45 ° with respect to the elliptical long axis direction of the cam surface 7A of the outer rotor 7, and is arranged to face both sides of the inner rotor 4. Each of the side port walls (8A, 8B) may be arranged orthogonal to each other. The number of cylinders 5 of the inner rotor 4 may be set to five or more.

In the fluid motor according to the present invention configured as described above, when the pressurized fluid is supplied from the fluid pressure feed introduction portion PA inside the one shaft 3A to the one side port wall portion 8A, the pressure is increased. The pressurized fluid is supplied to two pressurized fluid supply / discharge holes 9 located on opposite sides of the shaft (3A, 3B).
Flows into the cylinder 5 of the first pressure chamber into which the piston ball 6 of the inner rotor 4 is inserted, and the pressure acts on the piston ball 6 inside the cylinder 5 to press the piston ball 6 outward in the cylinder 5 direction. Let outer rotor 7
To the cam surface 7A by point contact. However, when the inner rotor 4 and the outer rotor 7 rotate relative to each other by about 90 °, communication between the one side port wall 8A and the pressurized fluid supply / discharge hole 9 is interrupted, and the other side port wall 8B is closed. From the pressurized fluid supply / discharge hole 9 through the fluid pressure feed introduction portion PB inside the other shaft 3B.
The first piston ball 6 because the pressurized fluid is discharged to the side
The pressure acting on escapes to the opposite side. As a result, since the piston ball 6 rolls while tracing the cam surface 7A, the inner rotor 4 and the outer rotor 7 continuously rotate relative to each other.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings.
The fluid motor 1 is a fluid motor that performs a continuous rotary motion by using the energy of a viscous pressurized fluid such as a hydraulic pressure to be pumped. As shown in FIG. 1 and FIG. A disk-shaped inner rotor 4 having one shaft 3A having an introduction portion PA therein, and the other shaft 3B having a fluid pumping introduction portion PB for discharging fluid therein, and an inner rotor 4 having an elliptical inner wall shape. An outer rotor 7 housed inside a cam surface 7A provided so as to be relatively rotatable, and a cylinder 5 radially bored in the inner rotor 4 to accommodate the outer rotor 7
Formed on the inner rotor 4 side surface from the piston ball 6 which can move back and forth between the cam surface 7A and the inner wall surface inside the cylinder 5 and the fluid pressure feeding introduction portion PA of the shaft 3A and the fluid pressure feeding introduction portion PB of the shaft 3B. Left and right side port walls (8A, 8B) in the form of long grooves, which are opposed to each other with the inner rotor 4 interposed therebetween so as to communicate with the cylinder 5 via the pressure fluid supply / discharge hole 9;
A bearing house 2 rotatably supports the left and right shafts (3A, 3B) and clamps and fixes an outer rotor 7 having an inner rotor 4 mounted therein.

As shown in FIGS. 2, 7, and 8, the bearing house 2 includes a right side portion 2B and a left side portion 2A, and the outer rotor 7 is held between the right side portion 2A and the left side portion 2A of the bearing house 2. Then, it is screwed and fixed with, for example, a bolt material (not shown).

As shown in FIGS. 2, 3 and 4, the disk-shaped inner rotor 4 is provided with, for example, five cylinders 5 as pressure chambers which are recessed in a substantially U-shape. In each of these five cylinders 5, a rigid spherical piston ball 6 is accommodated so as to be able to advance and retreat along the inner wall of the cylinder 5. At this time, the radius of curvature of the inner wall surface at the back of the cylinder 5 is substantially the same as the radius of curvature of the outer shape of the piston ball 6, and the stroke range of the advance and retreat movement of the piston ball 6 within the cylinder 5 is limited to the center (center of gravity) of the piston ball 6. ) Is the circumferential portion of the inner rotor 4, that is, the cylinder 5
Is set so as not to deviate outward from the edge of the U-shaped opening.

Further, shafts 3A and 3B are integrally formed on the inner rotor 4 outward from the center of the left and right side surfaces thereof, and pressurized fluid is supplied to the inside of one shaft 3A from the side port wall 8A. Cylinder 5 through pressurized fluid supply / discharge hole 9
A fluid pressure feed introduction part PA for pressure feed to the inside is drilled, and a pressurized fluid is discharged from the pressurized fluid supply / discharge hole 9 to the outside through the side port wall 8B inside the other shaft 3B. Pumping introduction part PB is provided. At this time, the fluid pressure feed introduction part P is located at the root of the shafts 3A and 3B.
A inlet section 10A, outlet section 10B of fluid pressure feed introduction section PB
Are formed respectively, and are exposed to the inside of each of the left and right side port walls 8A and 8B. And the inner rotor 4
The five pressurized fluid supply / discharge holes 9 formed to correspond to the five cylinders 5 are respectively connected to the five cylinders 5. Each of the left and right shafts 3A and 3B is rotatably connected to the bearing house 2 via an O-ring-shaped seal member 11 and a radial bearing 12.

A long groove formed between the fluid pressure feeding / introducing portions (PA, PB) of the shafts (3A, 3B) and the pressurized fluid supply / discharge hole 9 on the side surface of the inner rotor 4 so as to face each other with both sides of the inner rotor 4 interposed therebetween. Side port walls (8A, 8B) of the inner rotor 4
The shaft (3A, 3A)
Two pressurized fluid supply / discharge holes 9 located on the opposite side to B) are communicated with the fluid pressure feed introduction portions (PA, PB). That is, the side port wall (8A, 8
As shown in FIG. 1, the groove direction B) is formed along a direction inclined at an angle of α = 45 ° with respect to the elliptical long axis direction of the cam surface 7A of the outer rotor 7, and the inner rotor 4 Side port walls (8
A, 8B) are arranged orthogonal to each other.

As shown in FIGS. 1 and 5, the shape of the cam surface 7A, which is the inner wall of the cylindrical outer rotor 7, has a substantially elliptical shape, and the inner rotor is enclosed in a space surrounded by the elliptical inner wall. The inner rotor 4 is provided in a state where the diameter thereof and the elliptical minor axis of the elliptical inner wall substantially coincide with each other, and the left and right sides of the inner rotor 4 are provided on the left side 2A and the right side 2B of the bearing house 2.
, So as to be rotatable via a bearing 13. At this time, when the inner rotor 4 and the outer rotor 7 rotate relative to each other and the cylinder 5 is positioned in the elliptical long axis direction of the cam surface 7A, the piston balls 6 arranged in the cylinder 5 by the pressure of the pressurized fluid. Is pushed out of the position of the pressurized fluid supply / discharge hole 9 and comes into contact with the outer rotor 7 in a point contact state in a state of maximally protruding outside the cylinder 5. On the other hand, when the inner rotor 4 and the outer rotor 7 are further rotated relative to each other and the cylinder 5 is positioned in the elliptical short axis direction of the cam surface 7A, the piston ball 6 arranged in the cylinder 5 is supplied with pressurized fluid. The position of the hole 9 is slightly closed, and it is arranged so as to be substantially sandwiched between the inner wall surface of the cylinder 5 and the outer rotor 7, and is fed from the pressurized fluid supply / discharge hole 9 to the piston ball 6. The pressure of the pressurized fluid is made to work maximally.

Next, an example of use and operation of the embodiment configured as described above will be described. As shown in FIG. 1, a pressurized fluid is supplied from a fluid pressure feed introduction portion PA inside one shaft 3A to a pressurized fluid supply / discharge hole 9 from an inlet portion 10A at the root of the shaft 3A via one side port wall 8A. Then, the pressurized fluid is supplied from the pressurized fluid supply / discharge hole 9 to the inner rotor 4.
Flows into the cylinder 5 of the first pressure chamber into which the piston ball 6 is inserted (a position rotated clockwise by approximately α = 45 ° from the long axis of the ellipse of the cam surface 7A). Then, the pressure acts on the piston ball 6 inside the cylinder 5 to cause the piston ball 6 to be pressed outwardly of the cylinder 5 and abut against the cam surface 7A of the outer rotor 7. Is moved so as to roll along the cam surface 7A, but after the movement, the pressure is applied from the pressurized fluid supply / discharge hole 9 via the other side port wall 8B to the fluid pressure feeding / introducing portion PB inside the other shaft 3B. Since the pressurized fluid is discharged, the first pressure acting on the piston ball 6 escapes to the opposite side (a position rotated clockwise by about β = 90 ° from the long axis of the ellipse of the cam surface 7A). As a result, the piston ball 6 pressed out from the cylinder 5 in the inner rotor 4 rolls while tracing the cam surface 7A, so that the inner rotor 4 and the outer rotor 7 rotate relative to each other. For example, if the inner rotor 4 side is fixed, the outer rotor 7 side continuously rotates around the left and right shafts 3A and 3B. By pumping the pressurized fluid through the left and right shafts 3A and 3B in this manner, a combination of the outer rotor 7 and the bearing house 2 can be rotated as a rotating body in a wide rotation range. In addition, the fluid pressure feed introduction part PA
And the fluid pumping direction of the fluid pumping introduction part PB is reversed,
The outer rotor 7 itself can be rotated in the reverse direction.

In this embodiment, the inner rotor 4 is provided with five cylinders 5 serving as pressure chambers for accommodating the piston balls 6, but the present invention is not limited by such numerical values of the cylinders 5. Alternatively, the number of the cylinders 5 may be set to, for example, five or more even numbers or odd numbers together with the pressurized fluid supply / discharge holes 9 as another configuration.

[0015]

Since the present invention is constructed as described above, a wide range of rotation can be obtained with less resistance as compared with conventional vane motors (blade type rotary motors), radial plunger motors, etc. It is possible to provide a fluid motor that can provide rotational driving with friction and low wear, and that is lower in cost than a conventional motor driven by electric rotary driving.

That is, according to the present invention, an inner rotor 4 having shafts (3A, 3B) on both side surfaces, and an outer rotor in which the inner rotor 4 is rotatably mounted inside a cam surface 7A having an elliptical inner wall shape. And a piston ball 6 housed in a cylinder 5 radially bored in the inner rotor 4 and capable of moving back and forth between a cam surface 7A of the outer rotor 7 and an inner wall surface inside the cylinder 5; This is because a pressurized fluid supply / discharge hole 9 disposed opposite to the side surface of the inner rotor 4 for communication is provided, so that the piston ball 6 is pressed out of the cylinder 5 in the inner rotor 4 to the outer rotor 7. Since the roller contacts the point contact and rolls while tracing the cam surface 7A, a fluid motor having a small contact area and low friction and low wear can be formed. In particular, it is possible to provide a motor in which tip wear is less likely to occur with less resistance than a conventional vane motor.

[0017] Alternatively, a fluid pressure feed introduction part (PA, PB)
Inner rotor 4 having shafts (3A, 3B) provided therein
An outer rotor 7 in which the inner rotor 4 is rotatably mounted inside a cam surface 7A having an elliptical inner wall shape, and a cylinder 5 radially bored in the inner rotor 4,
A piston ball 6 which can move back and forth between a cam surface 7A of the outer rotor 7 and an inner wall surface inside the cylinder 5, and a shaft (3A,
3B) are provided with left and right side port walls (8A, 8B) opposed to each other so as to communicate from the fluid pressure feed introduction portions (PA, PB) provided inside the cylinder 5 of the inner rotor 4 with a shaft (3A, 3B). ) Is rotatably supported, and the bearing house 2 holds and fixes the outer rotor 7 having the inner rotor 4 therein, so that a small, lightweight, low-friction, low-wear fluid motor having a small contact area can be formed. Can be. Moreover, the combination of the outer rotor 7 and the bearing house 2 can be rotated as a rotating body in a wide rotation range.

The shaft (3A, 3A) of the inner rotor 4
B) Since the fluid pressure feed introduction portions (PA, PB) communicating with the pressurized fluid supply / discharge holes 9 are provided inside, the inner rotor 4 itself is integrated with the left and right shafts 3A, 3B to cover a wide rotation range. Can be rotated.

The relative position between the inner rotor 4 and the outer rotor 7 is located between the fluid pressure feed introduction portions (PA, PB) of the shafts (3A, 3B) and the pressurized fluid supply / discharge holes 9 on the side surface of the inner rotor 4. During rotation, two pressurized fluid supply / discharge holes 9 located on opposite sides of the shaft (3A, 3B) are inserted into the fluid pressure feed introduction part (P
A, PB), and has long groove-like side port wall portions (8A, 8B) disposed opposite each other across both side surfaces of the inner rotor 4 to communicate with the inner rotor 4, and grooves of the side port wall portions (8A, 8B). The direction is inclined at an angle of 45 ° with respect to the elliptical long axis direction of the cam surface 7A of the outer rotor 7, and each of the side port wall portions (8A, 8B) opposed to each other with both sides of the inner rotor 4 sandwiched therebetween Since the number of cylinders 5 of the inner rotor 4 is set to 5 or more, a stable torque is always obtained for the outer rotor 7 itself as a rotating body, and the efficiency is improved. Good continuous rotation can be easily obtained.

[Brief description of the drawings]

FIG. 1 is a schematic plan view according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line XX in FIG.

FIG. 3 is a plan view of an inner rotor.

FIG. 4 is a side view of the inner rotor.

FIG. 5 is a plan view of an outer rotor.

FIG. 6 is a sectional view taken along line YY in FIG.

FIG. 7 is a plan view of a bearing house.

8 is a sectional view taken along the line ZZ in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Fluid motor 2 ... Bearing house 3A, 3B ... Shaft 4 ... Inner rotor 5 ... Cylinder 6 ... Piston ball 7 ... Outer rotor 7A ... Cam surface 8A, 8B ... Side port wall 9 ... Pressurized fluid supply / discharge hole PA, PB: Fluid pressure feed introduction part

Claims (6)

[Claims] An inner rotor having shafts on both sides;
An outer rotor in which an inner rotor is relatively rotatably mounted inside a cam surface having an elliptical inner wall shape, and an outer rotor housed in a radially bored cylinder in the inner rotor, the outer rotor cam surface and a cylinder inner wall surface being A fluid motor, comprising: a piston ball that can move forward and backward; and a pressurized fluid supply / discharge hole that is disposed opposite to a side surface of an inner rotor to communicate with the cylinder. 2. An inner rotor having a shaft internally provided with a fluid pressure feed introduction portion, an outer rotor having the inner rotor rotatably mounted inside a cam surface having an elliptical inner wall shape, and a radial drilling on the inner rotor. A piston ball housed in a cylinder provided and capable of moving back and forth between a cam surface of an outer rotor and an inner wall surface inside the cylinder, and communicating with a fluid pressure introducing portion provided on a shaft into a cylinder of the inner rotor. A fluid motor comprising: a left and right side port wall disposed opposite to each other; a bearing house rotatably supporting a shaft; and holding and fixing an outer rotor containing an inner rotor. 3. A fluid pressure feed introduction portion communicating with the pressurized fluid supply / discharge hole is provided inside the shaft.
A fluid motor as described. 4. The fluid pressure feeding / introducing portion of the shaft and the pressurized fluid supply / discharge hole on the side surface of the inner rotor are located on opposite sides of the shaft during relative rotation of the inner rotor and the outer rotor. The fluid motor according to any one of claims 1 to 3, further comprising: a long groove-shaped side port wall portion which is opposed to both sides of the inner rotor so that the two pressurized fluid supply / discharge holes communicate with the fluid pressure feeding / introducing portion. 5. The side port wall has a groove direction inclining at an angle of 45 ° with respect to the elliptical major axis direction of the cam surface of the outer rotor, and the side port wall disposed opposite to both sides of the inner rotor. The fluid motor according to any one of claims 1 to 4, wherein each of the wall portions is arranged orthogonal to each other. 6. The fluid motor according to claim 1, wherein the number of cylinders of the inner rotor is set to five or more.