JP2001041146A - Radial cylinder pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To restrain a plurality of pistons at a stroke by mounting a ring- shaped support member along the inner periphery of a tubular torque ring in a radial cylinder pump advancing and retreating the piston in the radial direction relative to a rotating shaft, and engaging the respective pistons with the supporting member. SOLUTION: A rotating hydraulic transmission 0 is provided with a volume increasing and decreasing mechanisms Y1, Y2 sharing at least a torque ring 1 and a cylinder block 3 eccentially movable to the torque ring 1, and one of the volume increasing and decreasing mechanisms Y1, Y2 performs an motor action, and the other performs a pump action. Pistons 51, 52 are engaged with a supporting member 10 disposed along the inner periphery 11 of the torque ring 1, and the front ends of the pistons 51, 52 are brough into contact with or brought near the inner periphery 11 of the torque ring 1. The support member 10 is formed so as to be elastically deformed, and its elastic return force presses an outer surface 10a against the inner surfaces 51c, 52c of jaws 51b, 52b of the respective pistons 51, 52.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radial cylinder pump in which a piston projects and retracts radially with respect to a rotation shaft.

[0002]

2. Description of the Related Art A conventional radial cylinder pump of this type includes a cylindrical casing having an internal space,
A cylinder block housed in the internal space and rotatable about an eccentric axis deflected with respect to a center axis of the internal space; and a cylinder provided on an outer periphery of the cylinder block in a radial direction. A piston which is supported so as to be able to protrude and retract, and by rotating the cylinder block in a state where the piston is in contact with the inner peripheral surface of the casing, the relative distance between the outer peripheral surface of the cylinder block and the inner peripheral surface of the casing is changed. There is known a configuration in which the piston is protruded and retracted with respect to the cylinder by using a pump to perform a pump action.

[0003]

By the way, in such a radial cylinder pump, in order for the piston to protrude and retract with respect to the cylinder so that the suction operation can be performed normally, the piston is attached to the inner peripheral surface of the casing or is in contact with the inner peripheral surface of the casing. It needs to be close. For this reason, conventionally, for example, a low-pressure hydraulic fluid is charged (boosted) from the suction side to maintain the inside of the cylinder at a positive pressure so that the piston is always urged in the protruding direction, or a coil spring is provided for each cylinder. The piston is elastically urged in the projecting direction by the extension force.

However, the former requires a boost pump or the like, which complicates the equipment configuration, and the latter requires a coil spring to be provided for each cylinder, which complicates assembly.

[0005]

In order to solve the above-mentioned problems, a radial cylinder pump according to the present invention is provided with a ring-shaped support member along the inner periphery of a torque ring, and each of the support members has a piston. The main purpose is to ensure that the piston can be attached to or brought close to the inner periphery of the torque ring while having a configuration that is simple and easy to assemble. is there.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A radial cylinder pump according to the present invention is constructed so as to be rotatable about a cylindrical torque ring and an eccentric axis deviated from a center axis of the torque ring. Cylinder block, comprising a plurality of cylinders provided on the outer periphery of the cylinder block, a plurality of pistons respectively supported so as to be able to protrude and retract in the radial direction, the cylinder block generated with the rotation of the cylinder block By utilizing the relative distance change between the outer circumference and the inner circumference of the torque ring, the piston is protruded and retracted with respect to each cylinder to increase or decrease the volume of the space formed by the base end surface of the piston and the cylinder, thereby providing a pump action. The piston is engaged with a ring-shaped support member arranged along the inner periphery of the torque ring. Characterized in that it configured to the distal end surface of each piston is spliced or close to the inner periphery of the torque ring.

[0007] In such a case, since the piston can always be in contact with or close to the inner peripheral surface of the internal space by the support member, the piston can be reliably provided without providing a boost pump or the like on the suction side. It is possible to perform a suction action. Moreover, since a plurality of pistons can be restrained at once by adding only one support member, there is almost no increase in the number of parts or complicated assembly.

On the other hand, for smooth operation and improvement of efficiency, each piston is provided with a distal end surface and a proximal end surface in order to secure a static pressure balance between the distal end surface of the piston and the inner periphery of the torque ring in the discharge stroke. It is preferable to provide a through hole that opens in the through hole, and to form a pressure pocket at the tip of the through hole. However, in the case of such a configuration, in the suction stroke, hydraulic fluid or the like may be sucked through a small gap between the distal end surface of the piston and the inner circumference of the torque ring through the through hole, and a normal pump function may be impaired. is there. In order to avoid such a problem, it is desirable to dispose a check valve in the through-hole for inhibiting the flow of the hydraulic fluid from the distal end surface to the proximal end surface of the piston.

[0009] For example, in order to suitably cope with a configuration in which the diameters of the pistons are different, it is desirable that the support member is configured to maintain a constant position relative to the torque ring. In this case, the support member may be provided integrally with the torque ring. In the case where the piston has a flange often used in this type of pump, a special structure for engaging the support member with the piston by contacting the outer surface of the support member with the inner surface of the flange portion of the piston. Can be dispensed with. In other words, without any modifications to the existing ones,
The present invention can be realized very simply by simply adding a support member.

[0010] In order to further facilitate simplification of the assembly, it is preferred that the support member can be arranged on only one side of the piston. In order to make the piston stably abut or approach the inner circumference of the torque ring and improve the reliability of the operation, the support member is formed in a band shape, and at the central portion in the width direction and corresponding to the piston, It is preferable to form a piston insertion hole through which the piston body can be inserted in the thickness direction. This is because the support member can be engaged so as to hold it from both sides of the piston.

In order to press the piston against the inner surface of the torque ring with a suitable force to smoothly slide the piston on the torque ring, the support member is elastically deformable, and the elastic return force causes the piston to move inside the piston. It is preferable that it can be urged toward the inner peripheral surface of the space. On the other hand, while preventing a resonance phenomenon or the like at the time of high rotation, a high-rotation type pump can be configured, and the piston is pressed against the inner surface of the torque ring with a suitable force to smoothly slide the piston against the torque ring. It is preferable that the support member has high rigidity that hardly elastically deforms, and the support member and the piston are engaged with each other via an elastic member.

In order to reduce the number of support members used in a device having a plurality of piston rows as much as possible, a piston row having a plurality of pistons arranged in a plane perpendicular to the axis is moved in the axial direction. It is conceivable that a plurality of pistons are provided between the adjacent piston rows, and a support member is arranged between the adjacent piston rows, and each of the pistons belonging to a pair of piston rows adjacent to one support portion is engaged.

[0013]

An embodiment of the present invention will be described below with reference to the drawings. In this embodiment, a radial piston type motor and a radial piston type pump having different capacities are integrally provided so as to share some members, and the input primary pressure is increased or decreased to increase the secondary pressure. This is related to a pump portion of the rotary hydraulic transformer 0 having a function of being able to output pressure on the side.

As shown in FIGS. 1 and 2, the hydraulic transformer 0 has a torque ring 1 which is cylindrical and also serves as a casing.
And a cylinder block 3 configured to be rotatable about an eccentric axis L2 deviated from a center axis L1 of the torque ring 1 so as to be capable of eccentric movement with respect to the torque ring 1. And at least a first volume increasing / decreasing mechanism Y1 and a second volume increasing / decreasing mechanism Y2.
Is configured so that one of them performs a motor action and the other performs a pump action.

More specifically, the torque ring 1 has a regular decagonal inner shape in cross section, and is supported by a shaft 2 so as to be rotatable around its central axis L1. The cylinder block 3 is formed in a regular decagonal column shape.
The shaft 2 is rotatably supported around an eccentric shaft L2 with an eccentric shaft 21 provided integrally with the shaft 2 fitted therein. The cylinder block 3 may have various shapes such as a cylindrical shape.

The first volume increasing / decreasing mechanism Y1 is configured so that the torque ring 1, the cylinder block 3, a plurality of first cylinders 41 formed in the cylinder block 3, and the first cylinders 41 can be protruded and retracted. A plurality of first pistons 51 to be fitted, the first pistons 51 projecting from the first cylinder 41 with the eccentric movement of the cylinder block 3 with respect to the torque ring 1 or so as to cause the eccentric movements. By submerging, the volume of the first increasing / decreasing space 8 formed by the base end surface of the first piston 51 and the first cylinder 41 can be increased / decreased, and can operate as a pump or a motor.

The first cylinder 41 has a circular cross section.
5 on each side of cylinder block 3
One is open. The first piston 51 includes a piston main body 51a that protrudes and retracts from the first cylinder 41, and a flange portion 51b provided at a distal end of the piston main body 51a and having a larger diameter than the piston main body 51a. First piston 51
Are provided with through holes (not shown) opened at the base end face and the tip end face thereof, and guide the high pressure generated in the first increasing / decreasing space 8 to the pressure pockets opened at the piston tip end face through the through holes K to provide torque. A pressure liquid film is formed between the inner peripheral surface 11 of the ring 1 and the inner peripheral surface 11 so that the static pressure balance is maintained. With this configuration, smooth and efficient operation of the hydraulic transformer 0 is ensured.

The first increasing / decreasing space 8 is divided by an imaginary plane S formed by the center axis L1 and the eccentric axis L2, and one of them is a space 81 whose volume is increasing.
And the other is a space 82 whose volume is decreasing. The space 81 whose volume is increasing and the space 82 whose volume is decreasing are connected to a pair of first input / output ports A11, A12 (FIG. 1) via fluid paths A1, A2 provided in the distributor mechanism DB1, the shaft 2, and the like. 3 (shown in FIG. 3).

The second volume increasing / decreasing mechanism Y2 connects the torque ring 1 and the cylinder block 3 described above to the first volume increasing / decreasing mechanism Y.
1 and a plurality of second cylinders 42 formed in the cylinder block 3 and each second cylinder 42
And a second piston 52 which is fitted into the second piston 52 so that the second piston 52 can be protruded and retracted. Like the first volume increasing / decreasing mechanism Y1, the second piston 52 is moved with the rotation of the cylinder block 3 or so as to cause this eccentric movement. By projecting and retracting with respect to the second cylinder 42, the volume of the second increasing / decreasing space 9 formed by the base end surface of the second piston 52 and the second cylinder 42 is increased / decreased, and a pump or motor function can be performed. is there.

Thus, the second cylinder 42 is set to have a smaller diameter than the first cylinder 41, and the displacement volume V2 of the second increase / decrease space 9 is changed to the displacement volume V1 of the first increase / decrease space 8.
It is configured to be smaller. The second cylinder 42 has one side on the side where the first cylinder 41 is not provided.
The first cylinder 41 and the second cylinder 42 are adjacent to each other, and the first cylinder 41 and the second cylinder 42 are arranged in the same plane orthogonal to each other in the axial direction.
It is provided on the side of.

Like the first piston 51, the second piston 52 includes a piston main body 52a fitted to the second cylinder 42 so as to be able to protrude and retract, and a flange 52b having the same diameter as the flange 52 of the first piston 5. And a through-hole K which is open at the base end face and the tip end face. The second increase / decrease space 9 is
The displacement volume V2 is smaller than the displacement volume V1 of the first increase / decrease space 8, and is delimited by the virtual surface S.
One of them is the space 9 whose volume is increasing.
1 and the other one is the space 92 whose volume is decreasing. The space 91 whose volume is increasing and the space 92 which is decreasing are stored in the distributor mechanism DB.
2 and a pair of second input / output ports B11 and B12 (shown in FIG. 3) through fluid paths B1 and B2 provided in the shaft 2, respectively. Reference numeral D denotes a synchronization mechanism for causing the cylinder block 3 to revolve around the center axis L1 without changing its attitude when viewed with the torque ring 1 as a reference.

When such a hydraulic transformer is used as a booster, a hydraulic fluid having a differential pressure PL is applied between the first input / output ports A11 and A12 as shown in the upper part of FIG. Then, due to this differential pressure PL, a protruding output is given to the first piston 51 located in the space 81 whose volume is increasing, and the sum of these forces becomes a couple to apply a torque to the torque ring 1. . In this manner, the first volume increasing / decreasing mechanism Y1 performs a motor function. On the other hand, due to the relative distance change between the outer circumference 31 of the cylinder block 3 and the inner circumference 11 of the torque ring 1 caused by this rotation, the second
The piston 52 projects and retracts with respect to the second cylinder 42,
The volume of the increase / decrease space 9 increases / decreases. As a result, the second volume increasing / decreasing mechanism Y2 performs a pump action, and a differential pressure PH is generated between the second input / output ports. Here, the differential pressure PL and the differential pressure PH
Is given by the following equation (1).

PH = PL · (V1 / V2) (1) As described above, the primary pressure PL is increased to increase the secondary pressure PH.
It can be taken out as. In the present embodiment, as shown in the upper diagram of FIG. 3, one second input / output port B11 corresponding to the suction side of the second volume increasing / decreasing mechanism Y2 is connected to the first input / output port B11.
It communicates with one first input / output port A11 on the high pressure side of the volume increasing / decreasing mechanism Y1. By doing so, the output pressure is given by P1 (1 + V1 / V2) with respect to the input pressure P1, and a higher pressure can be achieved.
Further, by adopting such a circuit configuration, the displacement volume V1 of the first volume increasing and decreasing mechanism Y1 and the second volume increasing and decreasing mechanism Y2 are provided.
Even if the displacement volume V2 is equal, the pressurizing action can be performed.

On the other hand, when decreasing the voltage,
As shown in the lower diagram of FIG. 3, the second input / output ports B11, B1
Hydraulic fluid having a differential pressure pH as a primary pressure is applied between the two to cause the second volume increasing / decreasing mechanism Y2 to perform a motor action, and the rotation thereof causes the first volume increasing / decreasing mechanism Y1 to perform a pump action, thereby causing a first input. A differential pressure pL is generated as a secondary pressure between the output ports A11 and A12. Where the differential pressure pH
And the differential pressure pL is given by the following equation.

PL = pH · (V2 / V1) (2) As described above, the primary side pressure pH is reduced to the secondary side pressure pL.
It can be taken out as. In the present embodiment, as shown in the lower diagram of FIG. 3, one first input / output port A11 corresponding to the discharge side of the first volume increasing and decreasing mechanism Y1 is connected to one of the discharge sides of the second volume increasing and decreasing mechanism Y2. Second input / output port B1
It communicates with 1. By doing so, the output pressure is given by p1 {V2 / (V1 + V2)} with respect to the input pressure p1, and the pressure can be further reduced.
Further, with such a circuit configuration, even if the displacement volume V1 of the first volume increasing / decreasing mechanism Y1 is equal to the displacement volume V2 of the second volume increasing / decreasing mechanism Y2, the pressure reducing function can be performed.

In this hydraulic transformer, when the pressure is increased, the hydraulic fluid is charged (boost) from the suction side.
In the same manner as described above, the inside of the second cylinder 42 is maintained at a positive pressure, and the second piston 52 is constantly urged in the protruding direction and pressed against the torque ring 1 by the force.
Can perform pumping normally. However, when the other first input / output port A12 corresponding to the suction side of the first volume increasing / decreasing mechanism Y1 is communicated with the tank and the hydraulic fluid is directly sucked from the tank, as in the case of the above-described pressure reduction, etc. Unless any measures are taken, a force pressing against the torque ring 1 does not act on the first piston 51 particularly when the rotation speed is low, so that the first volume increasing / decreasing mechanism Y1 may not operate normally. This means that even when boosting
The same phenomenon can occur when the hydraulic fluid is directly sucked from the tank into the second volume increasing / decreasing mechanism Y2 on the secondary side or when the hydraulic fluid is directly sucked from the tank in this type of radial cylinder pump.

Therefore, in the present embodiment, as shown in FIGS. 1, 2 and 4, in these first and second volume increasing / decreasing mechanisms Y1 and Y2 which can operate as a radial cylinder pump, the inner circumference 11 of the torque ring 1 The pistons 51 and 52 are engaged with a ring-shaped support member 10 arranged along the axis, and the ends of the pistons 51 and 52 are brought into contact with or close to the inner circumference 11 of the torque ring 1. .

More specifically, the support member 10 is formed in a thin cylindrical shape having a constant width, and is configured to be capable of slightly elastic deformation. And by using the elastic return force,
The outer surface 10a is connected to the flange 5 of each piston 51, 52.
It is arranged so as to press against the inner surfaces 51c, 52c of 1b, 52b. In this embodiment, the support member 1
0 is provided only on one side of the pistons 51 and 52. Further, the rotation of the support member 10 with respect to the torque ring 1 is not restricted at all.

Further, in this embodiment, the pistons 51, 52
A check valve G for inhibiting the flow of the hydraulic fluid from the distal end to the proximal end of the piston is provided in the middle of the through hole K penetrated through the through hole K. According to such a configuration, the support member 10 allows the piston 5
The pistons 51 and 52 can be reliably moved up and down by the rotation of the cylinder block 3 because the pistons 1 and 52 can always be in contact with or close to the inner peripheral surface 11 of the torque ring 1. In other words, even in the case of pressure reduction, it is possible to reliably perform the suction operation in the first volume increasing and decreasing mechanism Y1, and in the case of pressure increasing, it is also possible to directly perform the suction operation from the tank to the second volume increasing and decreasing mechanism Y2. Become.

In particular, in this embodiment, since the support member 10 is engaged with the pistons 51 and 52 using the flanges 51b and 52b, there is no need to provide any special structure for this engagement. In addition, the support member 10 is connected to the piston 51,
Since only one side of the lever 52 is engaged, the present invention can be realized only by assembling the torque ring 1, the cylinder block 3, the pistons 51 and 52, and then inserting the support member 10 so as to bend slightly. And the assembling work is not complicated.

In addition, the pistons 51, 52 can be pressed against the inner periphery 11 of the torque ring with a suitable force by the elastic restoring force of the support member 10, so that the pistons 51, 52 slide smoothly on the torque rings 51, 52. Can have a positive effect on pump efficiency and life. Further, since the end surfaces of the pistons 51 and 52 are pressed against the inner periphery 11 of the torque ring 1 by the support member 10 and the posture thereof is restrained, the torque rings 1 of the cylinder block 3
Is restricted by the pistons 51 and 52. As a result, even if the synchronization mechanism D is omitted, the cylinder block 3 can be revolved only with respect to the torque ring 1, which can contribute to simplification of the structure.

Next, various modifications of the present invention will be described below. In these modifications, corresponding members are denoted by the same reference numerals. For example, it is conceivable that the support member 10 is configured to be thicker than that of the above-described embodiment so as to be hardly elastically deformed. In such a case, since the rigidity of the support member 10 is increased, it is possible to suppress the resonance phenomenon of the pistons 51 and 52 that may occur during high rotation. In such a configuration, as shown in FIG. 5, a wave washer 9 as an elastic member is fitted into the piston bodies 51a and 52a, or an elastic member such as an O-ring (not shown) is attached to the outer surface 10a of the support member. Thus, the wave washer 9 and the O-ring may be interposed between the outer surface 10a of the support member and the inner surfaces 51c and 52c of the flanges. Thereby, while suppressing the resonance phenomenon, the pressing force of the pistons 51 and 52 against the inner peripheral surface 11 of the torque ring can be made preferable, and the sliding smoothness between the distal end surface of the piston and the inner peripheral surface 11 of the torque ring can be ensured. .

When a highly rigid support member 10 is used as in this modification, the pistons 51, 52
It is necessary to secure the sliding smoothness with respect to the inner peripheral surface 11 of the torque ring, so that a slight gap is set between the distal end surfaces of the pistons 51 and 52 and the inner peripheral surface 11 of the torque ring.
As a result, in the suction stroke, a problem that the hydraulic fluid is sucked from the gap through the through hole K easily occurs. However, in this modification, as described in the above embodiment, a check valve G for inhibiting the flow of the hydraulic fluid from the distal end to the proximal end of the piston is provided in the middle of the through hole K penetrated by the pistons 51 and 52. Therefore, it is possible to effectively prevent the above-mentioned problems that may occur in the suction stroke while securing the static pressure balance between the distal end surfaces of the pistons 51 and 52 and the inner periphery 11 of the torque ring in the discharge stroke.

The supporting member 10 is not limited to a cylindrical member, but may have a cylindrical shape corresponding to the shape of the torque ring 1, for example, as shown in FIG. It may have a regular decagonal shape. In this case, each support member 10 needs to be configured to be fixed or synchronously rotated so that its relative position with respect to the torque ring 1 does not change.

Further, in order to make the support member 10 more elastically deformable and to improve the ease of installation, FIG.
The convex portion 101 and the concave portion 10 protruding and retracting in the radial direction as shown in FIG.
It may be a petal-tube-like member formed by alternately connecting 2 with each other. In this case, the protrusion 101 is
2 is engaged. For a similar purpose, FIG.
As shown in FIG.
03 may be discontinuous.

As shown in FIG. 9, a pair of support members 10 are provided, and the support members 10 are provided with pistons 51 and 52.
May be engaged so as to hold it from both sides. In this modified example, the supporting member 10 has a shape in which opposite side edges protrude and retract in the width direction.
The width of the groove M formed between the zeros is periodically changed. By doing so, it is possible to cope with pistons having different flange sizes. In this case as well, each support member 10 needs to be configured to be fixed or synchronously rotated so that its relative position with respect to the torque ring 1 does not change.

Further, as shown in FIG.
Is formed in a wider band shape, and a piston insertion hole 104 through which the piston main bodies 51a, 52a can be inserted in the thickness direction is formed in a central portion in the width direction and corresponding to the pistons 51, 52. Further, as shown in FIG. 11, for example, as shown in FIG. 11, in a configuration having a plurality of piston rows 5A in which a plurality of pistons are arranged in a plane perpendicular to the axis along the axial direction, It is preferable that the support member 10 be disposed between the piston rows 5A to be engaged, and the respective pistons belonging to a pair of adjacent piston rows 5A be engaged with the common support member 10 disposed therebetween.
With such a configuration, the support members 10 can be shared by the adjacent piston rows 5A, and the number of support members 10 used can be reduced as much as possible. In the case of this modification, as shown in FIG.
a is provided with a groove N, and the support member 10 is engaged with the groove N so that the adjacent piston rows 5A can be brought as close as possible. The groove N may have a multi-stage shape for convenience of assembly.

Of course, any combination of the above-described embodiments and modifications is conceivable, and it goes without saying that the present invention can be applied not only to a hydraulic transformer but also to various radial cylinder pumps. In addition, the configuration of each unit is not limited to the illustrated example, and various modifications can be made without departing from the spirit of the present invention.

[0039]

As described in detail above, according to the present invention,
Since the piston can always be in contact with or close to the inner peripheral surface of the internal space by the support member, the suction operation can be reliably performed without providing a boost pump or the like on the suction side. In addition, multiple pistons can be restrained at once by simply adding one support member,
It hardly causes an increase in the number of parts or complicated assembly.

Each piston is provided with a through-hole opening in the distal end face and the proximal end face, and a check valve disposed in the through-hole and for inhibiting the flow of the hydraulic fluid from the distal end face to the proximal end face. In the suction stroke, suction is performed from the gap between the piston front end face and the inner circumference of the torque ring during the suction stroke while ensuring a static pressure balance between the front end face of the piston and the inner circumference of the torque ring. It is possible to avoid such a problem that the normal pump action is hindered. In particular, when using a highly rigid support member, it is necessary to secure a slight gap between the piston front end surface and the torque ring inner circumference because it is necessary to ensure the sliding smoothness of the piston with respect to the inner circumference of the torque ring. Therefore, the above-described inconvenience is likely to occur, and such a configuration has a great effect.

As long as the support member is configured to keep the relative position with respect to the torque ring constant, it is possible to suitably cope with, for example, a configuration in which the diameters of the pistons are different.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a rotary hydraulic transformer showing one embodiment of the present invention.

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

FIG. 3 is a hydraulic circuit diagram of the rotary hydraulic transformer according to the embodiment.

FIG. 4 is a schematic partial perspective view showing a support member and the like of the embodiment.

FIG. 5 is a partial sectional view showing a first modification of the present invention.

FIG. 6 is a front view showing a support member according to a second modified example of the present invention.

FIG. 7 is a front view showing a support member according to a third modified example of the present invention.

FIG. 8 is a front view showing a support member according to a fourth modification of the present invention.

FIG. 9 is a perspective view showing a support member according to a fifth modification of the present invention.

FIG. 10 is a perspective view showing a support member according to a sixth modification of the present invention.

FIG. 11 is a schematic partial perspective view showing a support member and the like in a seventh modification of the present invention.

FIG. 12 is a partial sectional view showing a support member and the like in the modification.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Torque ring 11 ... Inner circumference of torque ring L1 ... Center axis L2 ... Eccentric axis 3 ... Cylinder block 31 ... Outer circumference of cylinder block 41, 42 ... Cylinder 51, 52: piston K: through hole G: check valve 10: support member

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[Procedure amendment]

[Submission Date] July 17, 2000 (2007.1)
7)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0006

[Correction method] Change

[Correction contents]

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A radial cylinder pump according to the present invention is constructed so as to be rotatable about a cylindrical torque ring and an eccentric axis deviated from a center axis of the torque ring. Cylinder block, comprising a plurality of cylinders provided on the outer periphery of the cylinder block, a plurality of pistons respectively supported so as to be able to protrude and retract in the radial direction, the cylinder block generated with the rotation of the cylinder block By utilizing the relative distance change between the outer circumference and the inner circumference of the torque ring, the piston is protruded and retracted with respect to each cylinder to increase or decrease the volume of the space formed by the base end surface of the piston and the cylinder, thereby providing a pump action. The piston is engaged with a ring-shaped support member arranged along the inner periphery of the torque ring. That the distal end face of each piston and adapted to spliced or close to the inner periphery of the torque ring
Wherein the support member is arranged only on one side of the piston .

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0009

[Correction method] Change

[Correction contents]

[0009] As a specific embodiment, a tubular tor is used.
Cling and deviation from the center axis of this torque ring
A syringe configured to be rotatable around the eccentric shaft center
And the outer periphery of this cylinder block.
Can be extended and retracted radially into multiple first cylinders
A plurality of first pistons supported by the
With the eccentric motion of the Dublock torque ring,
Alternatively, the first piston
By pushing the ton into and out of the first cylinder.
Formed by the base surface of the first piston and the first cylinder
Pump by increasing or decreasing the volume of space
A first volume increasing / decreasing mechanism that operates as a motor, and
Reduction mechanism, torque ring and cylinder block
As well as on the outer periphery of this cylinder block.
Radially applied to a plurality of second cylinders
A plurality of second pistons supported so as to be able to protrude and retract;
With eccentric motion of the torque ring of the Linda block
Or so as to cause this eccentric movement.
To make the piston protrude and retract from the second cylinder
Is formed by the base end face of the second piston and the second cylinder.
By increasing or decreasing the volume of the space created,
Is provided with a second volume increasing / decreasing mechanism that operates a motor,
Either the volume increasing / decreasing mechanism Y1 or the second volume increasing / decreasing mechanism Y2
One works as a motor and the other works as a pump
The torque ring.
The piston is attached to a ring-shaped support member arranged along the circumference.
Tongues, and apply the torque
That are attached to or close to the inner circumference of the
Can be mentioned.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0010

[Correction method] Change

[Correction contents]

For example, a configuration in which the diameters of the pistons are different.
In order to suitably support the above, the supporting member is preferably a torque ring.
Is configured to maintain a constant position relative to
It is desirable that In this case, the support member is
It may be provided integrally with the ring. Piston
With flanges often used in this type of pump
The outer surface of the support member against the inner surface of the flange of the piston.
The support member and the piston.
It is not necessary to provide a special structure for
Can be. In other words, without any modifications to the existing ones,
The invention can be implemented very simply by simply adding support members.
Can be manifested. In order to make the piston stably abut or approach the inner circumference of the torque ring and improve the reliability of the operation, the support member is formed in a band shape, and at the central portion in the width direction and corresponding to the piston, It is preferable to form a piston insertion hole through which the piston body can be inserted in the thickness direction. This is because the support member can be engaged so as to hold it from both sides of the piston.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI theme coat ゛ (reference) // F03C 1/247 F term (reference) 3H070 AA00 BB02 BB06 BB17 CC35 DD16 DD22 DD32 DD63 3H071 AA01 AA15 BB01 BB12 BB13 CC32 CC34 DD01 DD03 DD06 DD12 DD13 DD14 DD32 DD42 DD82 DD83 DD89 3H084 AA03 BB16 BB24 BB27 CC02 CC12 CC41 CC58 CC64

Claims (3)

[Claims] 1. A cylindrical torque ring, a cylinder block configured to be rotatable about an eccentric axis deviated from a center axis of the torque ring, and an outer periphery of the cylinder block. A plurality of cylinders provided are provided with a plurality of pistons supported respectively so as to be able to protrude and retract in the radial direction, and a relative distance change between the outer circumference of the cylinder block and the inner circumference of the torque ring caused by rotation of the cylinder block is provided. The piston is protruded and retracted with respect to each cylinder by using the piston, and the volume of the space formed by the base end face of the piston and the cylinder is increased or decreased to perform a pumping operation. The piston is engaged with a ring-shaped support member disposed along the inner circumference, and the tip end surface of each piston is attached to the inner circumference of the torque ring or A radial cylinder pump characterized by being configured to be close to each other. 2. Each piston is provided with a through hole opening at the distal end surface and the proximal end surface, and a check valve for inhibiting the flow of hydraulic fluid from the distal end surface to the proximal end surface is provided in the through hole. The radial cylinder pump according to claim 1, wherein: 3. The apparatus according to claim 1, wherein the support member is configured to maintain a constant position relative to the torque ring.
Or the radial cylinder pump according to 2.