JPH0366515B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a motor that generates rotational motion using a pressure medium, and more specifically, the present invention relates to a motor that generates rotational motion using a pressure medium. This relates to a motor that generates rotational motion by expanding and contracting.

[Conventional technology]

Motors that use pressure medium to generate rotational motion include those that supply pressure medium directly into the motor casing to rotate vanes, and those that sequentially supply pressure medium to multiple cylinders and use the pressing force of pistons to crank the motor. It is generally known to rotate the . These motors require the casing and cylinder to be airtight and use valves, so they not only require high precision parts but also have the disadvantage of requiring a large number of sealing members. Also,
These devices are generally heavy due to the heavy use of metal members, and have large sliding resistance, making low-pressure operation difficult.

Therefore, in recent years, as described in Japanese Patent Publication No. 53-23899, for example, bag-like members are arranged side by side in an annular manner, and rotational motion is generated by sequentially supplying and discharging pressure medium to each bag-like member. A motor has been proposed. According to this configuration, the airtightness of the motor casing, cylinders, valves, etc. are not required, so that the above-mentioned drawbacks of general motors are solved to some extent.

However, the motor described in the above publication has a plurality of elastically deformable bag chambers disposed in the circumferential direction between two support disks rotatably supported within the motor casing with their rotation axes inclined to each other. Because of this configuration, high precision is required in the processing and assembly of the support disk and motor casing, and there are also disadvantages in that the maximum generated torque is small.

[Problem that the invention seeks to solve]

The present invention was made to solve the above-mentioned drawbacks of conventional motors, and its purpose is to provide a motor that not only generates high torque but also can operate at low pressure.

Another object of the present invention is to provide a motor that does not require high precision in processing or assembling parts, has a simple structure, and is easy to reduce in size and weight.

[Means for solving problems]

The technical means taken by this invention to achieve these objectives are as follows.

As seen in FIGS. 1 to 3, the present invention includes a casing 1, a rotating shaft 3 rotatably supported by the casing 1, and a crank 4 formed on the rotating shaft 3 within the casing 1. a crank sleeve 6 that is rotatably attached to the outer periphery of the crank 4 and that revolves around the rotating shaft 3; and a crank sleeve 6 that revolves around the rotating shaft 3; At least three inflatable bag-like members 7 disposed along the track, and each expansion chamber 11a, 11b, 1 of the bag-like member 7
and a pressure medium distribution device 10 mounted on the outside of the casing 1 for distributing pressure medium to the casing 1c.

The pressure medium distribution device 10 includes each of the expansion chambers 1
Flow path 1 communicating with 1a, 11b, 11c, respectively
A base 13 having 9a, 19b, and 19c, a rotor 14 that engages with the rotating shaft 3 and rotates together with the rotating shaft 3, and a rotor presser 15 that holds the rotor 14 while pressing it toward the base 13. It is equipped with

The rotor 14 is held between the base 13 and the rotor holder 15 and rotates while sliding thereon, and is provided with a pressure medium supply hole 22a and a discharge hole 22b.

Further, the rotor holder 15 is provided with a pressure medium supply passage and a discharge passage, and
The base 13 is provided with grooves 21a, 21b, and 21c on the sliding surface of the rotor 14, which communicate with the flow paths 19a, 19b, and 19c, respectively.

Further, the supply hole 22a and the discharge hole 22b of the rotor 14 are configured to always communicate with the supply channel and the discharge channel of the rotor holder 15, respectively, regardless of the rotation of the rotor 14. On the other hand, the groove 21 of the base 13
a, 21b, and 21c are configured to communicate with each other in sequence as the rotor 14 rotates.

Then, each of the expansion chambers 11a, 11b, 1
The rotating shaft 3 is rotated by sequentially supplying or discharging pressure medium to the crank sleeve 1c at different timings and applying torque to the crank sleeve 6.

[Effect]

The bag-like member 7 is arranged between the crank sleeve 6 and the side wall of the casing 1.
Since the expansion chambers 11a, 11b, 11c of the bag-shaped member 7 are provided in parallel along the orbit of the
By sequentially inflating and expanding/contracting the crank sleeve 6 using a pressure medium at different timings, the crank sleeve 6, which is eccentric with respect to the rotating shaft 3, and, by extension, the crank 4 can be caused to revolve due to the pressing force generated by the expansion. This revolution causes the rotating shaft 3 to rotate.

Since the crank sleeve 6 is rotatably attached to the crank 4, it can rotate in a direction opposite to the revolution direction when the crank sleeve 6 revolves. Therefore, the movement of the crank sleeve 6 in the direction of rotation relative to the bag-like member 7 is offset, and almost no friction occurs with the bag-like member 7, so that the rotating shaft 3 rotates smoothly.

Further, pressure medium is supplied to the pressure medium distribution device 10 via a supply flow path provided in the rotor holder 15, and this pressure medium is supplied to the supply through hole 22a of the rotor 14 and the sliding surface of the base 13. Groove 2 provided in
1a, 21b, 21c, and each expansion chamber 11 through the flow paths 11a, 11b, 11c of the base 13.
a, 11b, and 11c are reached. On the other hand, each expansion chamber 1
The pressure medium in 1a, 11b, 11c follows the reverse process to the above, that is, the pressure medium in the flow path 1 of the base 13
1a, 11b, 11c, groove 21a of base 13,
21b, 21c, and further through the discharge passage 22b of the rotor 14, and is discharged to the outside from the discharge passage of the rotor holder 15.

Therefore, when the rotor 14 rotates, the rotor 14
A supply hole 22a and a discharge hole 22b provided in
The grooves 21a, 21b, and 21c of the base 13 match in this order, and the pressure medium can pass through the rotor 14 only through the matched portion. In this way, as the rotor 14 rotates, the channels connecting the supply hole 22a and the discharge hole 22b and the grooves 21a, 21b, 21c are automatically opened and closed, so that each expansion chamber 11a, 11
Pressure medium is supplied to b and 11c in order, and
The pressure medium in each expansion chamber 11a, 11b, 11c can be discharged in turn.

[Example] Hereinafter, an example of the present invention will be described based on the accompanying drawings.

In FIG. 1 and FIG. 2, 1 is a cylindrical casing, and a rotating shaft 3 is rotatably supported on its axis by a pair of bearings 2. In FIG. This rotating shaft 3
A cylindrical member is fixed eccentrically inside the casing 1, thereby forming a crank 4. This cylindrical member has a plurality of through holes 4a therein to reduce the weight of the crank 4. A cylindrical crank sleeve 6 is rotatably attached to the outer surface of the crank 4 via a pair of bearings 5.

Three bag-like members 7 are arranged at equal intervals around the axis of the casing 1 between the side wall of the casing 1 facing the side surface of the crank sleeve 6 and the crank sleeve 6. Each bag-shaped member 7 is inflatable and is attached to the side wall of the casing 1 by a mounting member 8 having a through hole therein. Each mounting member 8
A joint 9 is attached to the outside of the casing 1.

Reference numeral 10 denotes a pressure medium distribution device, which serves to control and distribute pressure medium to the expansion chambers 11a, 11b, and 11c of each of the bag-like members 7.
This distribution device 10 is attached by fixing the base end of a cylindrical casing 12 so as to be concentric with the axis of the casing 1 of the motor.

Inside the casing 12 are a base 13 and a rotor 14, as best seen in FIG.
and rotor presser 15 are stacked in this order and are pressed by a compression spring 16 disposed on the outside of rotor presser 15. This compression spring 16 is held by a cap 17 screwed onto the tip of the casing 12.

The base 13 has a thick disk shape, and has a through hole 18 formed in its axis, and three communication holes 19a, 19b, and 19c formed in the semi-longitudinal direction on its side surface. This through hole 18 has a rotor 14
The shaft portion 14a is inserted through each communication hole 19a, 19.
b, 19c are connected to the joint 2 from the outside of the casing 12.
0 is screwed on. The base 13 further includes three arcuate grooves 21a, 21b, 2 formed at equal intervals around the through hole 18 on the side surface in contact with the rotor 14.
1c. Each arcuate groove 21a, 21b, 2
1c has the above-mentioned communication holes 19a, 19 near the bottom.
It communicates with b and 19c.

The rotor 14 includes a shaft portion 14a and a disc-shaped main body portion 1.
4b, and the main body part 14b has two fan-shaped through holes 2.
2a and 22b. This fan-shaped through hole 22
a, 22b are located symmetrically with respect to the axis of the main body portion 14b, and are adapted to move on the arcuate grooves 21a, 21b, 21c of the base 13 when the rotor 14 rotates. The main body portion 14b of the rotor 14 further includes a recess 23 on the side surface in contact with the rotor holder 15, which is continuous with the fan-shaped through holes 22a and 22b.
a, 23b. One depression 23a is
From the center of the main body portion 14b to the fan-shaped through hole 22a,
The other depression 23b extends from near the outer periphery of the main body portion 14b to the fan-shaped through hole 22a.

The rotor holder 15 is a thick disc-shaped rotor 1
A pressure medium supply port 24 and a discharge port 25 are formed on the side opposite to 4. Further, a through hole 26 is formed on the axis of the rotor 14 side and communicates with the supply port 24, and an annular groove 27 is formed concentrically with the through hole 26 to connect the discharge port 25. It communicates with The through hole 26 is located above the depression 23a near the center of the rotor 14,
The annular groove 27 is formed to pass over the depression 23b near the outer periphery.

Coupling 9 attached to motor casing 1
and a joint 20 attached to the base 13 of the distribution device 10 are connected by a connecting pipe 28. Further, the tip of the shaft portion 14a of the rotor 14 is connected to the rotation shaft 3.
The rotor 14 is engaged at one end thereof, and as the rotating shaft 3 rotates, the rotor 14 also rotates.

Next, the operating state of the motor configured as above will be explained.

First, when compressed air is supplied as a pressure medium to the distribution device 10 from the supply port 24, the compressed air is delivered to the surface of the base 13 through the fan-shaped through hole 22a which communicates with the supply port 24 through the through hole 26 and the depression 23b. reach. If the fan-shaped through hole 22a is above the arcuate grooves 21a, 21b, 21c of the base 13, the compressed air passes through the arcuate grooves 21a, 21b, 21c and the communication holes 19a, 19b, 19c, and further passes through the connecting pipe 28. expansion chambers 11a, 11b, 11
It will be distributed and supplied to c. On the other hand, the compressed air supplied to the expansion chambers 11a, 11b, 11c is discharged from the fan-shaped through hole 22a, which communicates with the exhaust port 25 via the depression 23b and the annular groove 27, above the arcuate grooves 21a, 21b, 21c. It is done when In this way, in the distribution device 10, each expansion chamber 11a, 11b,
11c can be individually distributed and supplied with compressed air in sequence, and can be simultaneously discharged in the same manner.

The operation of this distribution device 10 will be explained in more detail with reference to FIG. 4 as follows.

When the rotor 14 is in the position shown in FIG. 4a, compressed air is supplied only through the arcuate groove 21a that communicates with the fan-shaped through hole 22a, and is exhausted only through the arcuate groove 21b that communicates with the fan-shaped through hole 22b. Ru. The arcuate groove 21c is connected to either of the fan-shaped through holes 22a,
22b, compressed air is neither supplied nor discharged through the arcuate groove 21c. The state of the expansion chambers 11a, 11b, and 11c at this time is shown in FIG. 4e. That is, the expansion chamber 11a communicating with the arcuate groove 21a expands, while the expansion chamber 11b communicating with the arcuate groove 21b contracts, and the expansion chamber 11c communicating with the arcuate groove 21c is sealed. There is.

In this case, due to the expansion of the expansion chamber 11a, the crank 4 is pressed diagonally upward to the left in the figure, and at the same time the expansion chamber 11b contracts, so the crank 4 begins to revolve in the direction of the arrow in the figure. As the crank 4 revolves, the rotor 14 also begins to rotate.

When the rotor 14 moves to the position shown in FIG. 4b, the communication state between the arcuate groove 21a and the fan-shaped through hole 22a does not change, but the fan-shaped through hole 22b is connected to the two arcuate grooves 21b,
It communicates with 21c. Therefore, as shown in FIG. 4f, compressed air is continuously supplied to the expansion chamber 11a, and compressed air from the other two expansion chambers 11b and 11c is discharged.

At this time, the crank 4 can continue to revolve due to the expansion of the expansion chamber 11a.

When the rotor 14 moves to the position shown in FIG. 4c, the communication state between the arcuate groove 21a and the fan-shaped through hole 22a does not change, as in the case of FIG. 4b, but
The difference is that the fan-shaped through hole 22b communicates only with the arcuate groove 21c. In this case, as shown in FIG. 4g, the expansion chamber 11a continues to be supplied with compressed air and continues to expand, while the expansion chamber 11c
The compressed air is exhausted and continues to contract. The expansion chamber 11b is sealed.

In this case as well, the crank 4 can continue to revolve due to the expansion of the expansion chamber 11a.

When the rotor 14 further rotates and moves to the position shown in FIG.
a, 21b, and the fan-shaped through hole 22b is connected to the arcuate groove 2.
It communicates with 1c. In this case, as shown in FIG. 4h, since compressed air is supplied to the expansion chambers 11a and 11b, the expansion chamber 11a continues to expand, and the expansion chamber 11b also begins to expand. The expansion chamber 11c continues to contract.

In this case, the crank 4 has two expansion chambers 1
Since the expansion of 1a and 11b pushes it substantially horizontally to the left, it is possible to continue the revolution.

The rotor 14 further rotates, and the fan-shaped through hole 22a
When it comes to communicate only with the arcuate groove 21b, a state similar to that shown in FIG. 4a occurs, and thereafter the crank 4 revolves in the same manner as described above. In this way, the crank 4 and thus the rotating shaft 3 rotate continuously.

In this way, the crank 4 revolves, and during this revolution, a force is applied to the crank 4 in a direction opposite to the direction of revolution due to friction with the bag-shaped member 7. In order to cope with this force, a crank sleeve 6 is rotatably attached to the crank 4 so that the crank sleeve 6 rotates during revolution, thereby minimizing the effect of this force.

Note that since the rotor 14 slides between the base 13 and the rotor holder 15 and no seal member is provided between them, some compressed air leaks from the gap. However, the rotor 14, the base 13
By making each contact surface of the rotor presser 15 as flat and smooth as possible, the amount of leakage can be suppressed to a level that does not cause any practical problems.

Further, although conventionally known materials can be used for the bag-like member 7, natural rubber, natural rubber,
It is preferable to use synthetic rubber, thermoplastic elastomer, thermoplastic resin, etc. alone or a composite of them and a tensile material. In addition, the bag-like member 7 is
It goes without saying that it can be carried out even if more than one is used.

Since the crank sleeve 6 is attached to the crank 4 so as to revolve while rotating, almost no friction occurs between the bag-shaped member 7 and the crank sleeve 6. However, if this friction is further reduced, not only the energy efficiency can be increased but also the durability of the bag-shaped member 7 can be improved. Therefore, the bag-like member 7
It is preferable to attach a low friction material such as a fluorine sheet to the contact surface with the crank sleeve 6.

Further, in this embodiment, the center of gravity of the crank 4 is not particularly corrected, but it is preferable to correct the center of gravity by a method such as attaching a balancer to the crank 4 or providing two or more cranks 4.

〔Effect of the invention〕

As is clear from the above description, the present invention has the following excellent effects.

(a) Expansion chamber 11a,
Since the direction of the pressing force generated by the expansion of 11b and 11c substantially coincides with the direction of revolution of the crank sleeve 6, this pressing force acts directly and effectively on the crank sleeve 6. Therefore, high torque can be easily generated by increasing the pressure of the pressure medium, and since almost no sliding resistance occurs, operation at low pressure is also possible.

(b) Since the pressure medium is only supplied from the distribution device 10 to the bag-shaped member 7, there is no need for airtightness of the casing 1, cylinders, valves, etc., and there is no need for fitting members or sliding parts that require high-precision processing. No moving parts are required either. Therefore, processing and assembly are easy, and the structure is also simple.

(c) Since the structure is simple and no special precision parts are required, it is easy to make the parts smaller and lighter by making them from synthetic resin.

(d) Since the pressure medium distribution device 10 is provided outside the casing 1, there is no need to disassemble the casing 1 when repairing the pressure medium distribution device 10, etc., and these operations can be performed very easily.

(e) By rotating the rotor 14 while sliding on the base 13 and the rotor holder 15 as the rotating shaft 3 rotates, the supply channel and the discharge channel provided in the rotor holder 15 are connected to the rotor 14. A groove 21 provided in the sliding surface of the base 13 through the supply hole 22a and the discharge hole 22b, respectively.
Since the grooves 21a, 21b, and 21c are appropriately provided, at least three of the supply through holes 22a or the discharge through holes 22b of the rotor 14 are connected to each other in order.
Two of the three grooves 21a, 21b, and 21c can be easily communicated at the same time.

Therefore, the rotating shaft 3 can be rotated smoothly.

(f) Since the rotating shaft 3 and the pressure medium distribution device 10 are provided separately, the rotating shaft 3 only needs to be rotatably supported on the casing 1, and the pressure medium distribution device 10 is arranged so that the rotor 14 Rotating axis 3
It is only necessary to attach it to the casing 1 so that it rotates with the casing 1.

Therefore, processing and assembly of the casing 1 and rotating shaft 3 can be easily performed.

[Brief explanation of drawings]

FIG. 1 is an explanatory longitudinal cross-sectional view showing one embodiment of a motor according to the present invention. Figure 2 shows A in Figure 1.
- A cross-sectional view along the A line. FIG. 3 is an exploded perspective view showing the main parts of the dispensing device. FIG. 4 is an explanatory diagram showing the operating principle of the motor according to the present invention, and (a) to (d) show states in which the distribution of pressure medium to each expansion chamber changes according to changes in the position of the rotor. , (e) to (h) are the above (a) to
(d) shows a state in which each bag-like member expands or contracts in response to changes in the position of the rotor, causing rotational movement. DESCRIPTION OF SYMBOLS 1... Casing, 3... Rotating shaft, 4... Crank, 6... Crank sleeve, 7... Bag-shaped member, 10... Pressure medium distribution device, 11a, 11
b, 11c... expansion chamber.

Claims (1)

[Scope of Claims] 1. A casing 1, a rotating shaft 3 rotatably supported by the casing 1, a crank 4 formed on the rotating shaft 3 within the casing 1, and a rotating shaft around the outer periphery of the crank 4. a crank sleeve 6 that is revolvably attached and that revolves around the rotating shaft 3; and at least a crank sleeve that is disposed along the orbit of the crank sleeve 6 between the crank sleeve 6 and the side wall of the casing 1. Three inflatable bag-like members 7 and each expansion chamber 11a, 11b, 1 of the bag-like member 7
a pressure medium distribution device 10 attached to the outside of the casing 1 for distributing pressure medium to the expansion chambers 1c;
Flow path 1 communicating with 1a, 11b, 11c, respectively
A base 13 having 9a, 19b, and 19c, a rotor 14 that engages with the rotating shaft 3 and rotates together with the rotating shaft 3, and a rotor presser 15 that holds the rotor 14 while pressing it toward the base 13. The rotor 14 is held between the base 13 and the rotor holder 15 and rotates while sliding thereon, and is provided with a pressure medium supply hole 22a and a discharge hole 22b. Further, the rotor holder 15 is provided with a pressure medium supply passage and a discharge passage, and
The base 13 is provided with grooves 21a, 21b, and 21c on the sliding surface of the rotor 14, which communicate with the flow paths 19a, 19b, and 19c, respectively. The discharge hole 22b is configured to always communicate with the supply channel and the discharge channel of the rotor holder 15 regardless of the rotation of the rotor 14, while
a, 21b, and 21c are configured to communicate with each other sequentially as the rotor 14 rotates. ，
A rotary motion using a pressure medium, characterized in that the pressure medium is sequentially supplied or discharged to the crank sleeve 11c at different timings, and torque is applied to the crank sleeve 6 to rotate the rotating shaft 3. A motor that generates