JPS63105280A - Motor for generating rotary motion using pressure medium - Google Patents

Abstract

PURPOSE:To generate a high torque by making the direction of a pressing force which is generated by the expansion of expansion chambers due to a pressure medium agree with the revolving direction of a crank sleeve. CONSTITUTION:Bag type members 7 are provided in parallel along the revolving track of a crank sleeve 6, and the expansion chambers 11a-11c of the bag type members 7 are expanded by means of a pressure medium at a shifted timing. Thereupon, the crank sleeve 6 is revolved while a rotary shaft 3 is rotated. Since the directions of the pressing force of the expansion chambers 11a-11c nearly agree with the revolving direction of the crank sleeve 6 and the pressing forces effectively act on the crank sleeve 6, easily generating a high torque.

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. By expanding and contracting,
It relates to a motor that generates rotational motion.

[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. Something that rotates -In is known. These motors require the casing and silling 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. In addition, these materials are generally heavy due to the heavy use of metal materials.
In addition, the sliding resistance was large, making low-pressure operation difficult.

Therefore, in recent years, for example, as described in Japanese Patent Publication No. 53-23899, 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.

[Problems to be solved by the invention] This invention was made to solve the above-mentioned difficulties of conventional motors, and its purpose is to not only generate high torque but also be able to operate at low pressure. Our goal is to provide motors.

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) and a rotating shaft (1) rotatably supported by the casing (1) and having a crank (4) inside the casing (1).
3), a crank sleeve (6) rotatably attached to the outer periphery of the crank (4), and a crank sleeve (6) facing the side surface of the crank sleeve ′(6) of the casing (1). at least three inflatable bladder members (7) disposed between the side wall and each inflation chamber (11a011b) (llb) of the bladder member (7);
Pressure medium distribution device (llc) for distributing pressure medium to (llc)
10).

The bag-like member (7) is attached to the casing (1) in parallel along the orbit of the crank sleeve (6). Further, the pressure medium distribution device (10) includes:
Each of the above expansion chambers (lla) (11b011c) (llc
) by sequentially supplying or discharging pressure medium at different timings, the crank sleeve (6) is caused to revolve.

[Effect]

The bag-like member (7) is provided in parallel along the orbit of the crank sleeve (6) between the crank sleeve (6) and a side wall of the casing (1) that faces the side surface of the crank sleeve (6). Since the bag-like member (7)
When the expansion chambers (lla) (llb) (llc) of are sequentially expanded and contracted by a pressure medium at different timings,
The pressing force generated by the expansion allows the crank sleeve (6), which is eccentric with respect to the rotating shaft (3), to revolve, and thus the crank (4). 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 crank sleeve (
6) in the rotation direction is suppressed, almost no friction occurs with the bag-shaped member (7), and the rotating shaft (3) rotates smoothly. Detailed description of the invention.

In FIGS. 1 and 2, (1) is a cylindrical casing, and a rotating shaft (3) is rotatably supported on its axis by a pair of bearings (2).

A cylindrical member is eccentrically fixed to the rotating shaft (3) inside the casing (1), thereby forming a crank (4). This cylindrical member has a plurality of through holes (4a) inside to reduce the weight of the crank (4).
)have. A cylindrical crank sleeve (6) is attached to the outer surface of the crank (4) via a pair of bearings (5).
) is rotatably mounted.

Three bag-shaped 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 of the crank sleeve (6) and the crank sleeve (6). has been done. Each bag-like member (7) is inflatable and is attached to the side wall of the casing (1) by means of an attachment member (8) having a through hole therein. Each attachment member (8) is fitted with a coupling (9) on the outside of the casing (1).

(10) is a pressure medium distribution device, and each of the bag-like members (
7) Expansion chamber (11aH11b) (llb) (llc
) that controls the distribution of pressure medium to the This distribution device (10) consists of a cylindrical casing (
12) is attached by fixing the proximal end thereof so that it is concentric with the axis of the motor casing (1).

Inside the casing (12), as shown most clearly in FIG. 3, a base (13), a rotor (14) and a rotor holder (15) are stacked in this order. It is pressed by a compression spring (16) placed on the outside. 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, with a through hole (
18) is formed, and three communication holes (19a) (19b) (19c) are formed in the radial direction on the side surface thereof. This through hole (18) has a rotor (14
) is inserted through each communication hole (19a).
(19b) A joint (20) is screwed onto (19c) from the outside of the casing (12). The base (13) further has the above-mentioned through hole (18) on the side surface in contact with the rotor (14).
) Three arcuate grooves (21a) formed at equal intervals around the
(21b) and (21c).

Each of the arcuate grooves (21a) (21b) (21c) has the above-mentioned communication holes (19a) (19b) (19c) near the bottom.
) is in communication.

The rotor (14) includes a shaft portion (14a) and a disc-shaped main body portion (
14b), and the main body portion (14b) has two fan-shaped through holes (22a) and (22b). These fan-shaped through holes (22a) (22b) are located symmetrically with respect to the axis of the main body (14b), and when the rotor (14) rotates, the arcuate groove (21a) of the base (13) (21
b) It is designed to move on (21c). The main body (14b) of the rotor (14) further has fan-shaped through holes (22a) (22b) on the side surface in contact with the rotor holder (15).
) are continuous with depressions (23a) and (23b). One recess (23a) extends from the center of the main body (14b) to the fan-shaped through hole (22a), and the other recess (23b) extends from the vicinity of the outer periphery of the main body (14b) to the fan-shaped through hole (22b).
It extends to

The rotor holder (15) is a thick disc-shaped rotor holder (15).
) and the pressure medium supply port 1- (24) on the opposite side.
and a discharge port (25) are formed. 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 is formed concentrically with the through hole (26). (27) is formed and communicates with the discharge bow (25). Through hole (26)
is located above the depression (23a) near the center of the rotor (14), and 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 communication pipe (28). Further, the tip of the shaft portion (14a) of the rotor (14) is engaged with the rotating shaft (3) at one end, so that the rotor (14) also rotates as the rotating shaft (3) rotates. It has become.

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

First, when compressed air is supplied as a pressure medium from the supply boat (24) to the distribution device (10), the fan-shaped through-hole ( From 22a) the compressed air reaches the surface of the base (13). The fan-shaped through hole (22a) is connected to the arcuate groove (21a) (21b) (21c) of the base (13).
If the compressed air is above the arcuate grooves (21a) (21b
) (21c) and communication holes (19a) (19b) (
19c) and further through the communication pipe (28) to be distributed and supplied to the expansion chambers (lla) (llb) (llc). On the other hand, the expansion chamber (lla) (llb)
The compressed air supplied to (llc) is discharged through the recess (23
The fan-shaped through hole (22b) communicating with the discharge port (25) via the annular groove (27) and the arcuate groove (21a)
(21b) (21c) Performed when it is above. In this way, the distribution device (10) rotates the rotor (14), so that each expansion chamber (lla) (11b) (ll
The compressed air can be individually distributed and supplied to (c) in sequence, and can be simultaneously discharged in the same manner.

The operation of this distribution device (10) will be explained in more detail based on FIG. 4 as follows.

When the rotor (14) is in the position shown in FIG. 4(a), compressed air is supplied only through the arcuate groove (21a) that communicates with the fan-shaped through hole (22a) and communicates with the fan-shaped through hole (22b). It is discharged only through the arcuate groove (21b).

The arcuate groove (21c) is connected to either sector-shaped through hole (22a) (
22b), compressed air is neither supplied nor discharged through the arcuate groove (21c). Expansion chambers (11a) (11b) (llb) (llc) at this time
The state of is shown in FIG. 4 (+3). That is,
The expansion chamber (11a) communicating with the arcuate groove (21a) expands, while the expansion chamber (11a) communicating with the arcuate groove (21b) expands.
llb) is contracted, and the expansion chamber (11C) communicating with the arcuate groove (21c) is sealed.

In this case, the expansion of the expansion chamber (lla) causes the crank (
4) is pressed diagonally upward to the left in the figure, and at the same time the expansion chamber (l
lb) contracts, so the crank (4) begins to revolve in the direction of the arrow in the figure. The rotor (14) also begins to rotate as the crank (4) revolves.

When the rotor (14) moves to the position shown in FIG.
) (21c). Therefore, as shown in FIG. 4(f), compressed air is continuously supplied to the expansion chamber (lla), and the other two expansion chambers (11b) (11c)
) (llc) compressed air is being discharged.

At this time, the crank (4) can continue to revolve due to the expansion of the expansion chamber (lla).

When the rotor (14) moves to the position shown in FIG. 4(C), the communication state between the arcuate groove (21a) and the fan-shaped through hole (22a) does not change, as in the case of FIG. 4(b). 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. 4(g), the expansion chamber (lla) continues to be supplied with compressed air and continues to expand, while the compressed air in the expansion chamber (llc) is discharged and continues to contract. ing. Expansion chamber (llb
) are sealed.

In this case as well, the crank (4) can continue to revolve due to the expansion of the expansion chamber (lla).

When the rotor (14) further rotates and moves to the position shown in FIG.
a) (21b), and the fan-shaped through hole (22b) communicates only with the arcuate groove (21c). In this case, Figure 4 (h
) as shown in the expansion chambers (11a) (11b)
Since compressed air is supplied to (llb), the expansion chamber (
lla) continues to expand, and the expansion chamber (lla) continues to expand.
b) also begins to expand. The expansion chamber (llc) continues to contract. In this case, the crank (4) is pushed almost horizontally to the left by the expansion of the two expansion chambers (11a011b) (llb), so it continues to revolve further. The rotor (14) that can rotate further rotates to open the fan-shaped through hole (
22a) comes into communication only with the arcuate groove (21b), a state similar to that shown in FIG. 4(a) is reached, 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 manner, the crank (4) revolves, and during this revolution, a force acts on the crank (4) in the direction opposite to the direction of revolution due to friction with the bag-shaped member (7). To cope with this force, the crank (4) has a crank sleeve (6).
is rotatably installed, and the crank sleeve (6
) rotates on its own axis to minimize 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, by making the contact surfaces of the rotor (14), base (13), and rotor holder (15) as flat and smooth as possible, the amount of leakage can be suppressed to a level that does not cause any practical problems.

Furthermore, although conventionally known materials can be used for the bag-like member (7), natural rubber, synthetic rubber,
It is preferable to use a thermoplastic elastomer, a thermoplastic resin, etc., or a composite thereof with a tensile material. Of course, it is also possible to use four or more bag-like members (7).

Since the crank sleeve (6) is attached to the crank (4) so as to revolve while rotating, the bag-shaped member (7)
) and the crank sleeve (6), almost no friction occurs. 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, it is preferable to attach a low-friction material such as a fluorine sheet to the contact surface of the bag-shaped member (7) with the crank sleeve (6).

Further, in this embodiment, the center of gravity of the crank (4) is not particularly corrected, but the center of gravity may be corrected by attaching a balancer to the crank (4) or providing two or more cranks (4). preferable.

〔Effect of the invention〕

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

(a) An expansion chamber (lla) is created by a pressure medium such as compressed air.
) (11b) Since the direction of the pressing force generated by the expansion of (lie) and the direction of revolution of the crank sleeve (6) almost match, this pressing force directly and effectively acts on the crank sleeve (6). do.

Therefore, high torque can be easily generated by increasing the pressure of the pressure medium, and in combination with the fact that 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-like member (7), the casing (1)
There is no need for airtightness, cylinders, valves, etc., and there is no need for fitting members or sliding members that require high-precision machining. Therefore,
It is easy to process and assemble, and has a simple structure.

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

[Brief explanation of the drawing]

FIG. 1 is an explanatory longitudinal cross-sectional view showing one embodiment of a motor according to the present invention. FIG. 2 is a sectional view taken along A-AyA in FIG. 1. 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, where (al to (dl) indicate a state in which the distribution of pressure medium to each expansion chamber changes according to a change in the position of the rotor,
(e) to (hl indicate the state in which each bag-like member expands or contracts according to the change in the position of the rotor in (al to (d) above) and rotational movement occurs (1)...Casing (3 )
...Rotating shaft (4)...Crank (6)...
Crank sleeve (7)...bag-shaped member (10)...
...Pressure medium distribution device (11a) (11b) (lIC)
...Expansion chamber Figure 2 Figure 3

Claims (1)

[Claims] 1. A casing (1), a rotating shaft (3) rotatably supported by the casing (1) and having a crank (4) therein, and a rotating shaft (3) rotatably attached to the outer periphery of the crank (4). a crank sleeve (6) and at least three inflatable bladder-like members (7) arranged between said crank sleeve (6) and a side wall of said casing (1) facing said crank sleeve (6); and each expansion chamber (11a) (11b) (11c) of the bag-like member (7).
), and the bag-like member (7) comprises a pressure medium distribution device (10) for distributing pressure medium to the crank sleeve (
6) The above casing (1) in parallel along the orbit of
The pressure medium distribution device (10
) rotates the crank sleeve (6) and crank (4) by sequentially supplying or discharging pressure medium to each of the expansion chambers (11a, 11b, and 11c) at different timings, thereby rotating the rotation shaft (3). ), which generates rotational motion using a pressure medium.