JP2559328Y2 - Cylinder drive type motor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application field] The present invention relates to a cylinder drive type motor, and in particular, converts a driving force of a cylinder into a rotational driving force via a screw nut and a screw shaft, and rotates forward within a predetermined rotational speed. And a cylinder drive type motor capable of reverse rotation.

(Prior art)

Conventionally, a hydraulic motor or an air motor has been widely used as a small rotary driving force source. However, when these motors are used at a low rotation speed, the output torque is low and the rotation becomes unstable, and a load is particularly applied. In this case, there is a problem that the startability is significantly reduced. Therefore, a motor provided with a speed reducer to generate a high torque at low rotation has been put to practical use. However, since the speed reducer is provided, there is a problem that the motor is increased in size and complexity and the production cost is increased.

Therefore, as a motor which can be configured to be relatively small and generate high torque at low rotation, for example, Japanese Patent Application Laid-Open No. 54-120338 or Japanese Patent Application Laid-Open No. A cylinder drive type motor that converts the driving force of a pressure cylinder into a rotational driving force via a rack and pinion mechanism is described. Also, in Japanese Patent Application No. 2-151262, A cylinder drive type motor that converts to rotational driving force via a mechanism was proposed.

[Problems to be solved by the invention]

In the above-mentioned conventional cylinder drive type motor using a rack and pinion mechanism or a crank mechanism, a rack or connecting rod having a predetermined length must be provided at the end of the piston rod of the fluid pressure cylinder, and the motor is downsized. In addition, there is a problem that the number of parts for providing the rack and pinion mechanism and the crank mechanism increases, and the manufacturing cost of the motor increases.

On the other hand, it is also possible to use a screw nut and a screw shaft instead of the rack and pinion mechanism and the crank mechanism, and to convert the linear motion of the piston of the fluid pressure cylinder into a rotary motion through the screw nut and the screw shaft. There is a problem that the sealing structure for sealing the holes is complicated, and the durability of the motor is reduced. Furthermore, in order to be able to convert the driving force of the cylinder into the rotational driving force via the screw nut and the screw shaft, it is necessary to provide a rotation restricting mechanism that restricts the rotation of the piston member of the hydraulic cylinder together with the screw nut and the screw shaft. However, there is a problem that the number of parts increases and the manufacturing cost of the motor increases.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a small and simple cylinder driving motor for converting the driving force of a hydraulic cylinder into a rotational driving force via a screw nut and a screw shaft.

[Means for solving the problem]

The cylinder drive type motor according to the first aspect is a cylinder drive type motor for converting a drive force of a fluid pressure cylinder means into a rotational drive force, and is a double-acting type having a piston member capable of reciprocating a predetermined stroke. A fluid pressure cylinder means is provided, a screw nut inserted and fixed inside the eccentric shaft hole of the piston member and having a shaft center parallel and eccentric to the shaft center of the piston member is provided. A screw shaft rotatably supported by the end wall of the cylinder body of the fluid pressure cylinder means and having the other end extending outside the cylinder body, and the other end of the screw shaft being integrally or separately rotated therewith. An output shaft is provided, and the piston member is formed with a piston main body having a diameter smaller than the inner diameter of the cylinder main body and one end and the other end of the piston main body in a flange shape. A first piston portion and a second piston portion are provided, and a partition wall portion slidably fitted to the piston body portion between the first and second piston portions is provided on the cylinder body to partition the first piston portion. A first fluid pressure working chamber is formed between the wall portions, and a second fluid pressure working chamber is formed between the second piston portion and the partition wall portion.

The cylinder driving type motor according to the second aspect is a cylinder driving type motor for converting a driving force of a fluid pressure cylinder into a rotation driving force, wherein a rotation output member rotatably connected to a main body member is provided. A screw nut inserted and fixed inside the shaft hole of the rotation output member is provided, and a screw shaft inserted and screwed into the screw nut and extending outside both ends of the rotation output member is provided. A first hydraulic cylinder eccentric to a shaft is provided, and a piston member of the first hydraulic cylinder is non-rotatably connected to one end of a screw shaft via a first coupling mechanism; The screw shaft is configured to be able to be pushed and driven by the fluid pressure cylinder toward the rotation output member, and the first coupling mechanism is configured to be capable of adjusting a relative rotation position of the screw shaft with respect to the piston member. At the other end of the screw shaft, a main body member is provided with a single-acting second hydraulic cylinder eccentric with respect to the screw shaft, and a piston member of the second hydraulic cylinder is mounted on the other end of the screw shaft at a second end. The screw shaft is configured to be able to be driven by the second fluid pressure cylinder toward the rotation output member by being relatively non-rotatably connected via the connection mechanism,
The second connection mechanism is configured to adjust a relative rotation position of the screw shaft with respect to the piston member.

[Action]

In the cylinder drive type motor according to the first aspect,
The double-acting hydraulic cylinder means receives the supply of fluid pressure and can reciprocate the piston member, and the driving force of the hydraulic cylinder means is converted into the rotational driving force of the screw shaft via a screw nut fixed to the piston member. Then, the rotation driving force causes the rotation output shaft integrally or separately provided on the screw shaft to rotate forward or backward within the stroke range of the hydraulic cylinder. The cylinder drive type motor is composed of a fluid pressure cylinder means, a screw nut and a screw shaft provided inside the fluid pressure cylinder means, and a rotation output shaft provided at an end of the screw shaft. The configuration of the motor can be greatly simplified and downsized. Further, the screw nut and the screw shaft are provided eccentrically with respect to the axis of the piston member, and the driving force of the fluid pressure cylinder can be converted into the rotational driving force without providing a rotation restricting mechanism for restricting the rotation of the piston member. It is possible, and the motor does not loosen and rotate due to the load.
The number of parts can be reduced, and the motor can be manufactured at low cost.

In addition, since the first and second fluid pressure working chambers are formed between the first and second piston portions of the piston member and the partition wall of the cylinder body, respectively, the sealing structure can be greatly simplified, and Can be improved in durability.

In the cylinder drive type motor according to the second aspect,
When fluid pressure is alternatively supplied to the first or second hydraulic cylinder, and the screw shaft is pushed and driven toward the rotation output member via the piston member of the first or second hydraulic cylinder,
The driving force of the fluid pressure cylinder is converted into the rotation driving force of the screw nut, and the rotation output member rotates forward or backward. The cylinder drive type motor has two single-acting hydraulic cylinders,
Since it is composed of a screw nut and a screw shaft, a rotation output member, two connecting mechanisms, etc., the configuration of the cylinder drive type motor can be greatly simplified and downsized.

Further, since each fluid pressure cylinder is provided eccentrically with respect to the screw nut and the screw shaft, there is no need to provide a rotation restraining mechanism for restraining the rotation of the piston member. Since a normal cylinder can be used as the pressure cylinder, the motor can be manufactured simply and inexpensively.

[Effect of the invention]

According to the cylinder drive type motor according to the first aspect, since the cylinder drive type motor is constituted by the fluid pressure cylinder means, the screw nut and the screw shaft, the rotation output shaft, and the like, the configuration of the cylinder drive type motor is greatly increased. It is possible to simplify and reduce the size. Since the screw nut and the screw shaft are provided eccentrically with respect to the axis of the piston member, the rotation restraining mechanism for restraining the rotation of the piston member can be omitted, the number of parts can be reduced, and the manufacturing cost of the motor can be reduced. Can be achieved.

In addition, since the first and second fluid pressure working chambers are formed between the first and second piston portions of the piston member and the partition wall portion of the cylinder body, respectively, the fluid pressure supplied to the fluid pressure cylinder means is increased. The sealing structure for sealing the motor can be greatly simplified, and the durability of the motor can be improved.

According to the cylinder drive type motor according to the second aspect, 2
Since it is composed of two single-acting hydraulic cylinders, a screw nut and a screw shaft, a rotary output member, and two connecting mechanisms, the configuration of the cylinder drive motor can be greatly simplified and downsized. Since each fluid pressure cylinder is provided eccentrically with respect to the screw nut and the screw shaft, the rotation restraining mechanism for restraining the rotation of the piston member can be omitted, the number of parts can be reduced, and a normal fluid pressure cylinder is used. Since a cylinder can be used,
The manufacturing cost of the motor can be reduced.

Further, the relative rotation position between the piston member and the screw shaft in the first hydraulic cylinder can be adjusted by the first coupling mechanism, and the relative rotation position between the piston member and the screw shaft in the second hydraulic cylinder can be adjusted by the second coupling mechanism. Therefore, it is possible to adjust the initial position and the end position of the driven object driven by the rotation output member in association with the positions of the piston members of the first and second hydraulic cylinders.

〔Example〕

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

<First Embodiment> A cylinder drive motor according to a first embodiment of the present invention is obtained by applying the present invention to a cylinder drive motor provided in a clamp drive device that moves and drives a clamp device for fixing a die to a press machine. It is.

 First, the press machine 1 will be briefly described.

As shown in FIG. 1, a fixed platen 4 for mounting a fixed die 3a of a mold 3 is provided on a base 2 of a vertical press machine 1, and a lower end of a slide 5 of the press machine 1 A movable plate 6 for mounting the movable die 3b of the mold 3 is provided.
T-grooves 7 are formed on the board side of the movable board 6 in the horizontal direction, respectively. The fixed board 4 is provided with four sets of tamping devices 10 for clamping the fixed mold 3a. There are provided four sets of clamping devices 10 for clamping the mold 3b,
Each clamp device 10 is provided so as to be movable in the left-right direction along the T groove 7. Each of the left and right side walls of the fixed platen 4 and the movable platen 6 is provided with two clamps 10 for moving the clamp device 10 between a retracted position shown by a solid line and a clamped position shown by a two-dot chain line.
Each set of clamp drive devices CD is provided.

 Next, the clamp device 10 will be described.

As shown in FIGS. 2 and 3, the clamp device 10 is pivotally attached to the main body member 11 via a main body member 11 and a pivot shaft 12 mounted on the main body member 11 in the front-rear direction. Clamp lever 13 and a clamp lever provided on the main body member 11.
And a hydraulic cylinder 14 for driving the main body member 11.
Leg 11a is movably engaged with the T groove 7.

Next, the clamp driving device CD will be described. However, since each clamp driving device CD has the same configuration, the movable platen 6
One of the clamp driving devices CD provided on the right side wall of the first embodiment will be described with reference to FIGS.

The clamp driving device CD comprises a vertically elongated housing 20 disposed on the right side of the movable platen 6 and a clamping device which is introduced into the T groove 7 from the housing 20 and has a lower end corresponding thereto.
A push-pull chain 30 connected to the push-pull chain 30 and a sprocket 40 disposed below the housing 20 and engaged with the push-pull chain 30.
And a cylinder drive motor 50 for rotating the sprocket 40.

The housing 20 is disposed with the opening 20a facing the slide 5 side. As shown in FIGS. 2 and 3, a block member 23 is fixed to the lower end of the side of the housing 20, and the block member 23 is It is fixed to the right wall of the movable platen 6 with bolts 25,
The upper ends of the front wall portion 20b and the rear wall portion 20c of the housing 20 are fixed to the bracket members 15 before and after being fixed to the slide 5 with bolts 22. The block member 23 is provided with a hydraulic pressure supply port 23a to which hydraulic pressure is supplied from an external hydraulic pressure supply device, and a guide groove 23b having the same shape as the T groove 7 and communicating with the T groove 7.

The push-pull chain 30 drives the clamp device 10 in a push-pull manner between a clamp position and a retracted position. As shown in FIGS. 2 to 4, an end-shaped chain 31 having a predetermined length is provided.
, A plurality of link plates 32 having a U-shaped cross section for preventing buckling are connected in contact with each other via connecting pins 31a, and both ends of each connecting pin 31a can be rolled into the T-slot 7 at each end. A play ring 33 is mounted, and the push-pull chain 30 and the clamp device 10 are connected to a connecting member 34.
Are connected via

As shown by the solid line in FIG. 3, when the clamp device 10 is located at the retracted position, the left portion of the push-pull chain 30 extends upward from the opening 20a side of the housing 20 and extends at the upper end of the housing 20. It is bent in an inverted U-shape, and its right portion extends downward along the right wall portion 20d of the housing 20, engages with the sprocket 40 at the lower end portion of the housing 20, and is provided with a pivot block member 26 provided on the housing 20. Guide groove
It is guided by 26a and introduced into the guide groove 23b of the block member 23. The push-pull chain 30 is inserted through a tunnel-shaped guide path in a link plate 32 to
Is disposed, one end of the hydraulic hose 16 is connected to a hydraulic supply port 23a of the block member 23, and the other end of the hydraulic hose 16 is connected to the main body member 11 of the clamp device 10, and through the hydraulic hose 16, The hydraulic pressure is supplied to the hydraulic cylinder 14.

The sprocket 40 is a front wall portion of the pivot block member 26.
4 and 5 is fixedly mounted on a rotation output shaft 78 of a cylinder drive type motor 50 to be described later via a coupling mechanism 80 having an adjusting function. As shown in the figure, the sprocket 40 is formed with a pair of front and rear sprocket portions 40a which engage with the front and rear play wheels 33 of the push-pull chain 30.

Next, the cylinder drive type motor 50 will be described.

The cylinder drive motor 50 is mounted on the rear wall 20c of the housing 20.
6 and 7, as shown in FIGS. 6 and 7, four bolts 62 are inserted through the cylinder body 61 of the double-acting air cylinder 60 having a special structure. Wall 26
Fixed to c. Inside the cylinder main body 61, a piston main body 65a having a smaller diameter than the inner diameter of the cylinder main body 61, a first piston portion 65b formed in a front end portion and a rear end portion of the piston main body portion 65a, and a second piston portion 65b are formed. A piston member 65 composed of a piston portion 65c is mounted, and an annular partition wall portion 61a slidably fitted to the piston body portion 65a is formed at the center of the cylinder body 61 in the front-rear direction. A first air pressure operating chamber 67 is formed between 65b and the partition wall 61a, and a second air pressure operating chamber 68 is formed between the second piston 65c and the partition wall 61a. Air hoses 69 and 70 for supplying pressurized air to the first and second air pressure operation chambers 67 and 68 are connected to the cylinder body 61, and when pressurized air is supplied to the first air pressure operation chamber 67, When the piston member 65 is driven by a predetermined stroke from the retracted position shown by the solid line in FIG. 5 to the advanced position shown by the two-dot chain line, and when pressurized air is supplied to the second air pressure operating chamber 68, the piston member 65 is moved to the advanced position. From the retracted position.

Next, a conversion mechanism that converts the driving force of the air cylinder 60 that drives the piston member 65 between the advanced position and the retracted position into rotational driving force will be described.

As shown in FIGS. 5 and 6, the piston member 65 includes:
An eccentric shaft hole 71 is formed at a position eccentric from the axis C1,
A ball screw nut 72 is inserted into the eccentric shaft hole 71 so that its axis C2 is parallel and eccentric to the axis C1 of the piston member 65, and the ball screw nut 72 has an annular fixing portion 72.
It is fixed to the piston member 65 by a bolt 73 at a.

A ball screw shaft 75 is inserted and screwed into the ball screw nut 72, and a rear end of the ball screw shaft 75 is rotatably supported by a bearing 76 mounted on a wall 61b of the cylinder body 61, and is disposed forward of the cylinder body 61. The front portion of the extended ball screw shaft 75 is rotatably supported by a bearing 77 mounted on the rear wall portion 26c of the pivot block 26, and the front portion of the ball screw shaft 75 has a rotary output shaft integrated with the ball screw shaft 75. 78 are formed.

When the piston member 65 is driven to the advanced position, the ball screw shaft 75 and the rotation output shaft 78 are driven to rotate via the ball screw nut 72, and as shown by the arrow in FIG. The sprocket 40 rotates clockwise, and the clamping device 10 is
When the piston member 65 is driven to the retracted position side, the sprocket 40 rotates counterclockwise in FIG. 3, and the clamp device 10 is driven to move in the opposite direction.

Here, a description will be given of the coupling mechanism 80 for adjusting the advance position (clamp position) of the clamp device 10 and transmitting torque according to the dimensions of the fixed die 3a or the movable die 3b.

As shown in FIGS. 5 and 8 to 10, a notch shaft portion 78a which is partially notched with an engagement surface is formed at the front end portion of the rotary output shaft 78 near the front end surface of the sprocket 40. ,
On the front end surface side of the sprocket 40, an engagement hole 81a with which the notch shaft portion 78a of the rotary output shaft 78 is engaged and a long bolt-shaped bolt hole 81b formed at a position equally divided into six circumferential parts are formed. A member 81 is provided, and a rotation output shaft 78 is provided on the front end face side of the first fixing member 81.
And a second fixing member 82 having a bolt hole 82b formed at a position equally divided into six parts on the circumference of the insertion hole 82a through which the notch shaft portion 78a is inserted in a loose fit. Reference numerals 83 and 84 denote first fixing members 81, respectively.
And a fastening bolt.

Clamping device according to the dimensions of fixed mold 3a or movable mold 3b
When setting the extension position of 10, the piston member 65 of the cylinder drive type motor 50 is located at the extension position, and the sprocket 40 is relatively rotated with respect to the rotation output shaft 78 in a state where the fastening bolt 84 is not attached. The position is set while adjusting the position of the clamp device 10.
-The second fixing members 81 and 82 are fixed to the sprocket 40. As described above, the first and second fixing members 81 and 82 are connected to the sprocket 40.
Fixed to the sprocket 40, the sprocket 40
The rotation driving force of the rotation output shaft 78 is transmitted to the sprocket 40 via the first fixing member 81, the second fixing member 82, and the fastening bolt 83. When the advance position of the clamp device 10 is slightly adjusted, the adjustment is performed with the fastening bolt 83 loosened, and then the fastening bolt 83 is again adjusted.
83 should be concluded.

The operation of the cylinder drive motor 50 configured as described above will be described.

First, when the clamp device 8 is moved from the retracted position to the clamped position, pressurized air is supplied to the first air pressure operating chamber 67 to drive the piston member 65 together with the ball screw nut 72 from the retracted position to the advanced position. Then, the ball screw shaft 75 and the rotation output shaft 78 are driven to rotate, and the sprocket 40 is driven to rotate clockwise via the coupling mechanism 80. At this time, since the ball screw shaft 75 is provided so that its axis C2 is eccentric from the axis C1 of the piston member 65, the piston member 65 does not rotate in the cylinder body 61, and Driving force is ball screw shaft
It is converted into the rotation driving force of the rotation output shaft 78 and the rotation output shaft 78.

When the sprocket 40 is driven to rotate, the sprocket 40
The push / pull chain 30 is driven downward in the housing 20 and the clamping device 10 is moved as shown by a two-dot chain line in FIG.
When the piston member 65 reaches the advanced position, the clamp device 10 is driven to the clamp position and the supply of the pressurized air to the first air pressure operating chamber 67 is stopped.

On the other hand, when the clamp device 10 is moved from the clamp position to the retracted position, when the pressurized air is supplied to the second air pressure operating chamber 68, the sprocket 40 is rotated counterclockwise, The chain 30 pulls the clamp device 10 from the clamp position to the retracted position while
When the piston member 65 reaches the retracted position, the clamp device 10 is driven to the retracted position and the supply of pressurized air to the second air pressure operating chamber 68 is stopped.

As described above, since the cylinder drive motor 50 is configured by the double-acting air cylinder 60, the ball screw mechanism including the ball screw nut 72 and the ball screw shaft 75, and the rotation output shaft 78, the configuration of the cylinder drive motor 50 is Can be greatly simplified and downsized. Further, since the ball screw mechanism is provided eccentrically with respect to the axis of the piston member 65, there is no need to provide a rotation restraining mechanism for preventing the rotation of the piston member 65, the number of parts can be reduced, and the motor 50 can be manufactured. Cost can be reduced. in addition,
Since the first and second air pressure operation chambers 67 and 68 are formed between the first and second piston portions 65b and 65c of the piston member 65 and the partition wall portion 61a of the cylinder body 61, respectively, pressurized air is supplied. The sealing structure for sealing can be greatly simplified, and the durability of the motor 50 can be improved.

By providing a special seal structure for the air cylinder and the ball screw mechanism, it is possible to provide an air pressure working chamber in the same manner as a normal double-acting cylinder. Further, a hydraulic cylinder can be used instead of the air cylinder. When the clamp devices 10 having different sizes and weights are moved and driven, the air pressure supplied to the air pressure operation chambers 67 and 68 may be changed. When the rotation output shaft 78 and the sprocket 40 are connected so that they cannot rotate relative to each other, the connection mechanism 80 can be omitted. <Second Embodiment> A cylinder drive motor 50A of this embodiment is configured by using two sets of single-acting air cylinders in place of the double-acting air cylinder 60 in the cylinder driving motor 50 described above. is there. The same members as those in the above embodiment are denoted by the same reference numerals, and description thereof will be omitted.

As shown in FIG. 11, the sprocket 40A is rotatably connected to the pivot block 26A via a bearing 42, and a ball screw nut 72 is provided in a shaft hole 43 formed in the sprocket 40A.
Is inserted, the ball screw nut 72 is fixed to the sprocket 40A by a bolt 73 at an annular fixing portion 72a, the ball screw shaft 75A is inserted and screwed into the ball screw nut 72, and the right end and the left end of the ball screw shaft 75A are the housing 20. It protrudes outward.

On the right and left ends of the ball screw shaft 75A, a single-acting first eccentric
Air cylinder 91 and second air cylinder 92 are pivot blocks
The right end portion and the left end portion of the ball screw shaft 75A are fixed to the 26A, and cannot be rotated relative to each other via a coupling mechanism 80 having an adjusting function for the piston members 93 and 94 of the first and second air cylinders 91 and 92, respectively. It is connected to. The first and second air cylinders 91 and 92 are connected to air hoses 97 and 98 so that pressurized air can be supplied to the respective air pressure operation chambers 95 and 96.

The operation of the thus configured cylinder drive type motor 50A will be described.

When pressurized air is selectively supplied to the air pressure operation chambers 95 and 96 of the first air cylinder 91 or the second air cylinder 92 to drive the piston member 93 or the piston member 94 together with the ball screw shaft 75A toward the sprocket 40A. The ball screw nut 72 and the sprocket 40A are driven to rotate, and the clamp device 10 can be driven between the clamp position and the retracted position. Since the ball screw shaft 75A is provided eccentrically with respect to the first and second air cylinders 91 and 92, the piston members 93 and 94 do not rotate, and the first and second air cylinders 91 and 92 do not rotate.
・ The driving force of the second air cylinders 92 and 93 is converted into the rotational driving force of the ball screw shaft 75A and the sprocket 40A, and the coupling mechanism 80 is provided, so that torque is applied to the ball screw shaft 74A via the sprocket 40A by an external load. Does not rotate, the ball screw shaft 75A does not rotate.

As described above, the cylinder drive motor 50A is composed of two single-acting air cylinders 91 and 92, a ball screw mechanism including the ball screw nut 72 and the ball screw shaft 75A, and the sprocket 40A as a rotation output member. The configuration of the drive motor 50A can be greatly simplified and downsized. Furthermore, since the air cylinders 91 and 92 are provided eccentrically with respect to the ball screw mechanism and the connecting mechanism 80 is provided, there is no need to provide a rotation restraining mechanism for restraining the rotation of the piston members 93 and 94, and the number of parts is reduced. Since the air cylinders 91 and 92 can use ordinary cylinders, the motor 50A can be manufactured simply and at low cost. Note that the connecting mechanism 80 may be omitted, and the ends of the ball screw shaft 75A may be integrally fixed to the piston members 93 and 94.

Note that the cylinder drive motors 50 and 50A can of course be applied to drive various devices such as a conveyor and a lifting device other than the clamp drive device CD. Therefore, in place of the sprocket 40A, various types of rotary output members such as a normal sprocket, a pulley for driving a belt, a sheave for driving a wire, and the like can be provided.

[Brief description of the drawings]

1 to 11 show an embodiment of the present invention. FIG. 1 is a front view of a press machine, FIG. 2 is a sectional view taken along the line II-II of FIG. 1, and FIG. Fig. 4 is a sectional view taken along the line III,
IV-IV sectional view, FIG. 5 is a longitudinal sectional view of the cylinder drive type motor, FIG. 6 is a view taken in the direction of arrow VI in FIG. 5, FIG. 7 is a partial sectional view of the cylinder drive type motor, FIG. FIG. 9 is a front view of the first fixing member, FIG. 10 is a front view of the second fixing member, and FIG. 11 is a diagram corresponding to FIG. 5 of the cylinder drive type motor according to the second embodiment. is there. 26 ... Pivot block, 40A ... Sprocket, 43 ... Shaft hole, 50
・ 50A… Cylinder drive motor, 60… Air cylinder, 61
… Cylinder body, 61a… Partition wall, 61b… Wall, 65 · 93 ·
94: piston member, 65a: piston body, 65b: first piston, 65c: second piston, 67: first air pressure operating chamber, 68: second air pressure operating chamber, 72: ball screw nut, 75
・ 75A ... ball screw shaft, 80 ... connection mechanism, 91 ... first
Air cylinder, 92 ... second air cylinder.

Claims (2)

(57) [Scope of request for utility model registration] 1. A cylinder drive type motor for converting a driving force of a hydraulic cylinder means into a rotational driving force, comprising a double-acting hydraulic cylinder means having a piston member capable of reciprocating a predetermined stroke, A screw nut inserted and fixed inside the eccentric shaft hole of the piston member and having a shaft center parallel to and eccentric to the shaft of the piston member; A screw shaft rotatably supported by an end wall of the main body and having the other end extending outside the cylinder main body; and a rotation output shaft integrally or separately provided with the other end of the screw shaft; The member includes a piston main body having a diameter smaller than the inner diameter of the cylinder main body, and first and second piston parts formed in a flange shape at one end and the other end of the piston main body, respectively. And a piston part provided in the cylinder body first and second
A partition wall portion slidably fitted to the piston body is provided between the piston portions, a first fluid pressure working chamber is formed between the first piston portion and the partition wall portion, and the second piston portion and the partition wall portion are provided. A cylinder drive type motor having a second fluid pressure working chamber formed therebetween. 2. A cylinder drive type motor for converting a driving force of a fluid pressure cylinder into a rotational driving force, comprising: a rotary output member rotatably mounted on a main body member; A screw nut inserted and fixed inside is provided, a screw shaft inserted and screwed into the screw nut and extending outside both ends of the rotation output member is provided, and one end of the screw shaft is eccentric to the main body member with respect to the screw shaft. A dynamic first hydraulic cylinder is provided, and the piston member of the first hydraulic cylinder is non-rotatably connected to one end of the screw shaft via a first connecting mechanism to connect the screw shaft with the first hydraulic cylinder. The first coupling mechanism is configured to be capable of being pushed and driven toward the rotation output member, and the first coupling mechanism is configured to be capable of adjusting a relative rotation position of the screw shaft with respect to the piston member. A single-acting second hydraulic cylinder eccentric to the screw shaft is provided on the body member on the side, and the piston member of the second hydraulic cylinder is rotated relative to the other end of the screw shaft via the second coupling mechanism. The screw shaft is configured to be capable of being pushed and driven by the second fluid pressure cylinder toward the rotation output member, and the second connection mechanism is capable of adjusting a relative rotation position of the screw shaft with respect to the piston member. A cylinder drive type motor comprising: