JP3037719B2 - Rotary actuator - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a rotary actuator, and more particularly, to an output shaft which is provided so as to be separable and penetrates a rotor unit having vanes.
The present invention relates to a technology that is effective when applied to a rotary actuator that generates torque by fluid pressure.

[Conventional technology]

Examples of this type of rotary actuator include, for example, the following.

That is, the rotary actuator is of a vane type and has an actuator body. In this actuator body, a pair of cup-shaped body members are connected in the axial direction via bolts, and a swing chamber is formed inside.

Output shafts are rotatably provided on both side walls of the swing chamber,
The output shaft is provided to be separable and penetrates the rotor unit with vanes.

One of the key grooves is formed on the outer peripheral surface of the shaft transmission portion and the inner peripheral surface of the rotor transmission portion, and the key is inserted into a key hole formed by fitting the two key grooves. And movement in the rotation direction is restricted. As another means, there is one provided with a spline.

[Problems to be solved by the invention]

By the way, in the structure of the conventional rotary actuator described above, the shaft transmission unit and the rotor transmission unit are configured such that the movement in the axial direction and the rotation direction is restricted via a key or a spline.

However, in the case of the key, there is a disadvantage that backlash between the output shaft and the rotor part increases during repeated swinging.

In the case of a spline, the cost is increased.

In addition, there has been a lack of consideration for the axial seal and lubrication between the output shaft and the rotor.

The present invention has been made in view of the above problems, the purpose of which is to improve the lubrication between the shaft transmission portion and the rotor transmission portion, sufficiently supply the lubricant to the axial seal portion, An object is to provide a rotary actuator with improved performance.

Another object of the present invention is that even when an external force in the axial direction is applied to the output shaft, all the external force is received by the bearing fitted into the actuator body. An object of the present invention is to provide a durable rotary actuator with reduced wear of a seal.

[Means for solving the problem]

The outline of a typical invention among the inventions disclosed in the present application will be briefly described as follows.

The rotary actuator of the present invention has a main body member on which an output shaft is rotatably mounted, and a rotor with vanes provided on the output shaft and capable of swinging in a swing chamber formed in the main body member. A rotary actuator for generating a oscillating torque on the output shaft by a fluid pressure applied to the oscillating chamber, wherein a deformed hole is formed in a rotor transmission portion of the vane-equipped rotor portion, Forming a deformed shaft body that fits slidably in the axial direction in the deformed hole in the moving part,
A space filled with the lubricant supplied to the sliding surface is formed between the shaft transmission portion and the rotor transmission portion, and an axial external force applied to the output shaft is not transmitted to the vaned rotor portion. In addition, the lubricant in the space is supplied to the sliding surface by sliding the output shaft.

In this case, it is effective that the deformed shaft and the deformed hole have a structure having a regular square or regular hexagonal cross-sectional shape.

[Action]

According to the rotary actuator of the present invention, the output shaft is provided so as to be separable through the rotor portion with vanes, and is a rotary actuator that generates torque by fluid pressure, wherein the shaft transmission portion of the output shaft is a deformed shaft body. The rotor transmission portion of the vane-equipped rotor portion has a structure in which a deformed hole that fits into the deformed shaft body and is slidable in the axial direction is used. In some cases, the swing base point can be easily changed by the combination of the output shaft and the inverting combination of the rotor.

Therefore, regardless of the piping position or the key position of the output shaft, the mounting of the actuator body is facilitated to improve the mountability, and it is not necessary to manufacture an actuator for each pivot base point, which is convenient for management. Cost can be reduced.

Further, when an external force acts on the output shaft in the axial direction, the external force acts directly on the bearing and does not directly act on the axial seal, so that wear can be reduced and durability can be improved.

Further, in the above case, if the shaft transmission portion and the rotor transmission portion are configured to have a length having sufficient strength for transmitting torque and a structure is formed in which both sides are filled with a lubricant by fitting, the shaft transmission portion is provided. The lubrication between the section and the rotor transmission section and the lubrication of the axial seal can be improved to improve the lubricity.

Still further, in the above case, if the modified shaft body and the modified hole have a structure having a regular square or hexagonal cross-sectional shape, the shaft transmission unit and the rotor transmission unit can be used by using a normal square rod or hexagonal rod. Can be easily processed, the processability can be improved, and the cost can be reduced.

The above and other objects and novel features of the present invention are as follows.
It will be apparent from the description of this specification and the accompanying drawings.

Embodiment 1 FIG. 1 is a sectional view showing a rotary actuator according to Embodiment 1 of the present invention, FIG. 2 is a sectional view taken along line AOA of FIG. 1, and FIGS. 3 (a) and 3 (b). 4) is a front view and a side view showing an output shaft, and FIGS. 4 (a) and 4 (b) are a partial sectional view and a side view showing a rotor unit with vanes.

The rotary actuator according to the first embodiment has an actuator body 2. The actuator body 2 has a pair of cup-shaped body members 2a and 2b connected via bolts 13, and a swing chamber 14 is formed therein.

An O-ring 16 and a bearing 17 are fitted on the inner peripheral surfaces of the shaft holes 15 formed in the main body members 2a and 2b, respectively, and the output shaft 1 is rotatably supported by the bearings 17. It is provided so as to be separable from the rotor unit 3 with vanes and penetrates. The axial movement of the rotor unit 3 with the vane is restricted by the inner wall of the swing chamber 14.

Specifically, the shaft transmission portion 18 of the output shaft 1 is a deformed shaft, and the rotor transmission portion 4 of the vane-equipped rotor portion 3 is a deformed hole that fits into the deformed shaft and can slide in the axial direction. It has a structure.

The shaft transmission portion 18 and the rotor transmission portion 4 have a length having sufficient strength for transmitting torque, and are formed with spaces 9 on both sides filled with lubricant by fitting.

Each of the deformed shaft and the deformed hole has a structure having a square cross section.

A key groove 5 is formed on an outer peripheral surface of an end portion of the output shaft 1, and a key 7 is fitted in the key groove 5.

The shoe seal 6 is fitted to the shoe 19, the axial seal 10 is baked on the axial side of the vane-mounted rotor section 3, and the vane seal 11 is baked on the vane section 8.

 Next, the operation of the first embodiment will be described.

When transmitting the torque generated to the rotor unit 3 with the vane due to the supply and discharge of air pressure, the shaft transmission unit 18 and the rotor transmission unit 4 move in the rotational direction by fitting a deformed shaft having a square cross section and a deformed hole. Because it is a structure that is constrained,
The torque generated in the rotor unit 3 with the vane is transmitted to the output shaft 1 and further transmitted to the driven body via the key 7.

When the swing origin is changed as required, the shaft transmission portion 18 and the rotor transmission portion 4 can slide in the axial direction with each other by fitting a deformed shaft having a square cross section and a deformed hole. Therefore, the swing base point can be easily changed by the installation position of the output shaft 1 and the inverted combination of the rotor unit 3 with the vane.

Therefore, regardless of the piping position or the key position of the output shaft, the mounting of the actuator main body 2 is facilitated to improve the mounting property, and it is not necessary to manufacture an actuator for each swing base point, which is convenient for management. Instead, the cost can be reduced.

Further, the shaft transmission portion 18 and the rotor transmission portion 4 have a length having sufficient strength for transmitting torque, and the space 9 for filling a lubricant such as grease is formed on both sides by fitting. If the space 9 is filled with a lubricant such as grease, the lubrication between the shaft transmission portion 18 and the rotor transmission portion 4 can be improved to improve the lubricity.
The supply of lubricant to the axial seal can also be guaranteed.

Therefore, incorporation of the output shaft 1 for changing the swing origin or reversal of the vane-equipped rotor portion 3 can be performed smoothly, and wear of the axial seal 10 can be reduced.
Durability can be improved.

When an external force acts on the output shaft 1 in the axial direction, the shaft transmission unit 18 moves the inner peripheral surface of the rotor transmission unit 4 along the axial direction by fitting the deformed shaft having a square cross section and the deformed hole. To slide and receive with the bearing, so the axial seal 10
Is not pressed against the inner wall of the swing chamber 14 and is not worn.

Furthermore, since both the shaft transmission portion 18 and the rotor transmission portion 4 have a structure having a square cross-section, a normal square rod can be used to facilitate processing, improve workability, and reduce cost. Can be planned.

Furthermore, from the viewpoint of the functions of the shaft transmission unit 18 and the rotor transmission unit 4, a gap is required between the transmission units 18 and 4 so that the transmission units 18 and 4 can be moved. This causes backlash at the swing end. If the gap between the opposite sides of the deformed shaft body and the deformed hole is the same, the backlash increases as the polygon becomes more polygonal due to the relationship between the length of the side and the gap. A regular hexagon and a regular hexagon generate approximately 1.6 times the backlash of the regular hexagon.

In addition, the circle inscribed in the regular polygon (the opposite side dimension with respect to the diagonal) becomes smaller as the angle becomes smaller. That is, it is necessary to make the diameter of the rotor transmission part 4 larger than the diameter of the shaft transmission part 18. In the case of a regular square, the diagonal dimension is about 1.2 times that of a regular hexagon.

Therefore, in consideration of such a point, it can be said that a regular square and a regular hexagon are desirable.

Second Embodiment FIGS. 5A and 5B are a front view and a side view showing an output shaft of a rotary actuator according to a second embodiment of the present invention, and FIGS. 6A and 6B are with vanes. It is the fragmentary sectional view and side view which show a rotor part.

The rotary actuator according to the second embodiment has the same structure as that of the first embodiment, except that a so-called hexagon having a deformed shaft and a deformed hole both having a regular hexagonal cross-sectional shape is formed as the shaft transmission portion 18 and the rotor transmission portion 4. It differs in that it is applied to shaft transmission.

The operation of the second embodiment is almost the same as that of the first embodiment. However, the different point will be described. In the case where the oscillation base point is changed as necessary, the oscillation base point is different from that of the first embodiment. Thus, the number can be increased from eight to twelve.

As described above, the invention made by the inventor has been specifically described based on the embodiment. However, the present invention is not limited to the embodiment, and various modifications can be made without departing from the gist of the invention. Not even.

For example, in the first and second embodiments, the case where the deformed hole as the rotor transmission portion has a cross section of a regular square or a regular hexagon has been described.
The present invention can be applied to a case where the regular pentagonal or irregular hole has a saw blade shape as shown in FIGS. 7 (a) and 7 (b).

That is, the saw blade shape of the modified hole shown in FIG.
The saw-tooth shape is formed by overlapping a square and a square rotated by 45 ° with respect to the square.

About an operation effect, in addition to the thing of said Example 1,
When the shaft transmission 18 having a square cross section is fitted to the rotor transmission 4 having the saw blade shape, every other space 12 having a triangular cross section is formed.
12 can be filled with lubricant such as grease, so the shaft transmission
The lubrication between the rotor 18 and the rotor transmission portion 4 can be further improved, and the lubricity can be further improved.

The shape of the saw blade of the modified hole shown in FIG. 7 (b) is substantially the same as that shown in FIG. 7 (a), and a description thereof will be omitted.

In the above description, the invention made mainly by the inventor has been described with respect to a vane type rotary actuator which operates by air pressure, which is a field of application, but the invention can also be applied to a vane type rotary actuator which operates by hydraulic pressure.

〔The invention's effect〕

The effects obtained by typical aspects of the invention disclosed in the present application will be briefly described as follows.

(1). A rotary actuator, wherein an output shaft is provided so as to be separable and penetrates a rotor portion with vanes, and a torque is generated by fluid pressure, wherein a shaft transmission portion of the output shaft is a deformed shaft body, The part has a structure with a deformed hole that fits into the deformed shaft body and can slide in the axial direction. Therefore, the swing base point can be easily changed by installing the output shaft and inverting the rotor. Can be.

Therefore, regardless of the piping position or the key position of the output shaft, the mounting of the actuator body is facilitated to improve the mountability, and it is not necessary to manufacture an actuator for each pivot base point, which is convenient for management. Cost can be reduced.

(2). Also, when an axial external force acts on the output shaft,
Since the shaft transmission portion slides on the inner peripheral surface of the rotor transmission portion and is received by the bearing, the axial seal is not strongly pressed against the inner wall of the swing chamber and is not worn.

(3). In the case of the above (1), the shaft transmission portion and the rotor transmission portion may have a length having sufficient strength for transmitting torque, and may have a structure in which spaces for filling lubricant are formed on both sides by fitting. The lubrication between the shaft transmission portion and the rotor transmission portion and the lubrication of the axial seal can be improved to improve lubricity.

(4). Further, in the case of the above (1), if the deformed shaft and the deformed hole have a structure having a regular square or hexagonal cross-sectional shape, the shaft transmission portion and the rotor transmission can be used by using a normal square rod or hexagonal rod. The processing of the part can be facilitated, the workability can be improved, and the cost can be reduced.

[Brief description of the drawings]

1 is a sectional view showing a rotary actuator according to a first embodiment of the present invention, FIG. 2 is a sectional view taken along line AOA of FIG. 1, and FIGS. 3 (a) and 3 (b) show output shafts. 4 (a) and 4 (b) are a partial sectional view and a side view showing a rotor unit with vanes, and FIGS. 5 (a) and 5 (b) show a second embodiment of the present invention. FIGS. 6 (a) and 6 (b) are partial cross-sectional views and side views showing a rotor unit with vanes, and FIGS. 7 (a) and 7 (b) are rotor transmissions. It is a side view which shows the modification of a part. DESCRIPTION OF SYMBOLS 1 ... Output shaft, 2 ... Actuator main body, 2a ... Main body member, 2b ... Main body member, 3 ... Rotor part with vane, 4 ... Rotor transmission part, 5 ... Keyway, 6 ... Shoe seal , 7 ... key, 8 ... vane part, 9 ... space, 10 ... axial seal, 11 ... vane seal, 12 ... space, 13 ... bolt, 14 ... swing chamber, 15 ... shaft Hole, 16 O-ring, 17 Bearing, 18 Shaft transmission, 19 Shoe.

Claims (2)

(57) [Claims] An output shaft includes a main body member rotatably mounted thereon, and a rotor portion provided with a vane provided on the output shaft and swingable in a swing chamber formed in the main body member. A rotary actuator for generating a swing torque on the output shaft by a fluid pressure applied to the swing chamber, wherein a shaped hole is formed in a rotor transmission portion of the vane-equipped rotor portion, and a shaft rolling portion of the output shaft. And a space in which the lubricant supplied to the sliding surface is filled between the shaft transmission portion and the rotor transmission portion. So that the external force in the axial direction applied to the output shaft is not transmitted to the rotor with vanes, and the lubricant in the space is supplied to the sliding surface by sliding the output shaft. A rotary actuator characterized in that: 2. The rotary actuator according to claim 1, wherein the deformed shaft and the deformed hole have a regular square or hexagonal cross section.