JPH08152004A - Rotary actuator - Google Patents

Abstract

PURPOSE: To reduce a machining cost for a rotary blade and a rotary drive shaft. CONSTITUTION: A rotary drive shaft 4 is extended through the axis of a casing 6 and a rotary blade 5 is provided to be rotatable integrally with the rotary drive shaft 4 in such a state that a seal member 13 is adhered on the inner peripheral surface and the upper and lower inner peripheral surfaces of a casing 6. A seal member 13 for the outer peripheral part of the rotary drive shaft 4 is provided and a pressure fixed wall 7 is provided to partition a space in a casing 6 so that oil chambers 14 and 15 independent from each other are formed on both sides of the rotary blade 5, Working oil feed and discharge ports 19 and 22 communicated to the oil chambers 14 and 15 are provided and the rotary drive shaft 4 is constituted oscillatively rotatably by means of feed oil to one oil chamber 14 and discharge oil from the other oil chamber 15. The rotary blade 5 is formed separately from the rotary drive shaft 4. A seal member 13 is mounted throughout a whole periphery, the base end part of the rotary blade 5 is fitted in a first fit-in groove 24 formed in the rotary drive shaft 4 side and extending along an axis, and the rotary blade 5 is attached on the rotary drive shaft 4 in a state to be fixed to a position in a peripheral direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention comprises a casing having a circular inner peripheral surface, which extends radially outward from a rotary drive shaft penetrating the axial center of the casing in a posture along the axial center and is provided on the entire circumference. A rotary blade that is integrally rotatable with the rotary drive shaft while closely contacting a seal member with the inner peripheral surface and the upper and lower inner surfaces of the casing is provided, and a seal member for the rotary drive shaft is provided at a peripheral portion to form a space in the casing. A pressure-resistant fixed wall for partitioning so as to form independent oil chambers on both sides of the rotary vane is provided in the casing, and a hydraulic oil supply / discharge port communicating with each oil chamber is provided near the fixed wall. And a hydraulic actuator that is configured to provide oil pressure to the rotary blades by oil supply to one oil chamber and oil discharge from the other oil chamber so that the rotary drive shaft can oscillate and rotate.

[0002]

2. Description of the Related Art Conventionally, in the above rotary actuator, a rotary blade is integrally formed with a rotary drive shaft, and a sealing member is attached to grooves of the peripheral portion of the rotary blade facing the inner peripheral surface and the upper and lower inner surfaces of the casing. I was there.

[0003]

However, according to the above construction, since the rotary blade is formed integrally with the rotary drive shaft, it is difficult to process them, and the sealing member is provided in the groove of the peripheral portion of the rotary blade. Even when installing, for example, it has been troublesome to install the free end of the seal member and the base end of the rotary blade so that there is no oil leakage. .

An object of the present invention is to provide a rotary actuator which can reduce the manufacturing cost of the rotary blade and the rotary drive shaft and can easily attach the seal member to the rotary blade.

[0005]

According to a characteristic structure of the present invention, the rotary blade is formed separately from the rotary drive shaft, and a seal member is attached over the entire circumference, and the rotary blade is formed on the rotary drive shaft side. The base end portion of the rotary blade is fitted into the first fitting groove along the shaft center, and the rotary blade is attached to the rotary drive shaft in a circumferentially fixed position.

The base end portions of the pair of fixing members are individually fitted into the pair of second fitting grooves formed along the shaft core of the rotary drive shaft, and the first fitting is provided between the fixing members. You may comprise so that a joint groove may be formed, the base end part of the said rotary blade may be fitted in this 1st fitting groove, and the said rotary blade may be attached to the said rotation drive shaft in a circumferential position fixed state.

[0007]

Since the rotary blade and the rotary drive shaft are formed separately from each other, the rotary blade and the rotary drive shaft can each have a simpler shape than when they are integrated, which simplifies machining. It can be carried out. Since the seal member is mounted over the entire circumference of the rotary blade, when the seal member is mounted on the rotary blade, the seal member only needs to be fitted on the rotary blade, and the seal member can be easily mounted on the rotary blade. Moreover, even though the rotary blade is formed separately from the rotary drive shaft, it is possible to reliably prevent the hydraulic oil from leaking from around the rotary blade. Further, since the base end portion of the rotary blade is fitted in the first fitting groove formed along the shaft core formed on the rotary drive shaft side, the rotary blade is circumferentially fixed to the rotary drive shaft and rotated. The rotary drive shaft can be oscillated by the hydraulic pressure acting on the blades.

In the case of the second aspect, since the pair of fixing members can also be formed in a simple shape such as a square plate shape, the fixing members can be easily processed.

[0009]

As a result, it is possible to prevent the hydraulic oil from leaking around the rotary blades and prevent the deterioration of the sealing performance, and it is possible to easily process the rotary blades and the rotary drive shafts, respectively. It is possible to provide a rotary actuator that can be manufactured at low cost, can easily attach the seal member to the rotary blades, and has good workability in assembling work.

[0010]

Embodiments of the present invention will now be described with reference to the drawings. As shown in FIG. 1, a steering mechanism 2 provided between left and right wheels 1 of a tractor is provided with a rotary actuator according to the present invention.

As shown in FIGS. 1, 2 and 3, in the rotary actuator, a rotary drive shaft 4 having one end connected to a pitman arm 3 of a steering mechanism 2 is passed through the axis of a casing 6, A pair of rotary vanes 5 extending radially outward from the rotary drive shaft 4 along the axis is provided, and a pair of pressure resistant fixed walls 7 are provided on the inner peripheral portion of the casing 6.
Is fixed and configured.

The casing 6 is constructed by sandwiching and fixing a cylindrical side plate 8 between a ceiling plate 9 and a bottom plate 10 through a plurality of connecting bolts 11. The ceiling plate 9 / bottom plate 10 and the cylindrical side plate 8 are formed. A seal member 12 is interposed between the side walls of the side plate 8 and the side plate 8.

The rotary vane 5 is provided with a seal member 13 on the entire circumference, and the rotary drive shaft 4 is brought into close contact with the seal member 13 on the inner surfaces of the ceiling plate 9 and the bottom plate 10 and the inner peripheral surfaces of the side plates 8. The vertical and horizontal dimensions are set so that it can rotate together with. As shown in FIG. 4, the rotary blades 5 are formed separately from the rotary drive shaft 4, and more specifically, two square outer plate members 5a and a pair of outer plate members 5a that are slightly smaller than the outer plate members 5a.
It is configured by stacking a sheet of a rectangular intermediate plate member 5b with their cores aligned and superposing the seal member 13 on the intermediate plate member 5b. Then, the base end portions of the pair of plate-shaped fixing members 16 are individually fitted into the pair of second fitting grooves 17 formed along the shaft core formed on the rotary drive shaft 4, so that both fixing members 16 are inserted.
A first fitting groove 24 is formed between them, and in this first fitting groove 24,
The base end portion of the rotary blade 5 is fitted and the rotary blade 5 is attached to the rotary drive shaft 4 in a circumferentially fixed state.

As shown in FIG. 2, the pressure resistant fixed wall 7 is
A seal member 1 is provided around the peripheral portion of the rotary drive shaft 4 at the peripheral portion.
3, the space inside the casing 6 is partitioned so that oil chambers 14 and 15 independent from each other are formed on both sides of the rotary blade 5. This pressure-proof fixed wall 7 also has two quadrangular outer plate members 5a, like the rotary vane 5.
And a rectangular intermediate plate member 5b, which is slightly smaller than both outer plate members 5a, and their cores are superposed on each other.
The seal member 13 is externally fitted to the intermediate plate member 5b. Since the rotary blade 5 and the pressure resistant fixed wall 7 have the same structure in this manner, the manufacturing cost can be reduced. The pressure-proof fixed wall 7 is clamped and fixed by a pair of fixing rods 18, one end of which is pierced by the ceiling plate 9 and the other end of which is pierced by the bottom plate 10.

As shown in FIG. 3, the central portions of the rotary drive shaft 4 on the side of the ceiling plate 9 and the bottom plate 10 extend outward in the axial direction to form boss portions 26, which rotate with the boss portions 26. A bearing 23 and a packing 24 are interposed between the free end portion of the drive shaft 4. Further, ring-shaped shoulder seals 25 are provided on the inner surfaces of the ceiling plate 9 and the bottom plate 10 around the rotary drive shaft 4.
Is attached to the seal member 13 in the radial direction to prevent the hydraulic oil from leaking.

The hydraulic oil supply / discharge ports 19 and 22 communicating with the respective oil chambers 14 and 15 for supplying / discharging the hydraulic oil are provided in the vicinity of the fixed wall 7, and one of the oil chambers 14 (specifically, the peripheral chamber) Supply of hydraulic oil to two oil chambers located every other direction), and discharge of hydraulic oil from the other oil chamber (two oil chambers circumferentially adjacent to the one oil chamber 14). Thus, a hydraulic pressure in the circumferential direction is applied to the rotary blades 5 so that the rotary drive shaft 4 can be oscillated and rotated.

According to the above construction, since the rotary blade 5 is formed separately from the rotary drive shaft 4, the rotary blade 5 and the rotary drive shaft 4 are respectively provided more than when they are integrated. It has a simple shape and can be easily processed. Then, the seal member 1 covers the entire circumference of the rotary blade 5.
3 is mounted, therefore, when mounting the seal member 13 on the rotary vane 5, it is only necessary to fit the seal member 13 on the outside,
The seal member 13 can be easily attached to the rotary blade 5, and even though the rotary blade 5 is formed separately from the rotary drive shaft 4, leakage of hydraulic oil from around the rotary blade 5 Can be reliably prevented.

[Other Embodiments] As shown in FIG. 5, the two outer plate members 5a and one square intermediate plate member 5b are
You may fix with the bolt 20 from those thickness directions.

As shown in FIG. 6, a stepped outer plate member 5c and a flat plate-shaped outer plate member 5d are stacked so that the reduced diameter portion of the stepped outer plate member 5c faces the outer plate member 5d. The sealing member 13 is fitted onto a groove formed over the entire circumference of the central portion in the thickness direction, and the rotary blade 5 and the fixed wall 7 are attached.
May be configured respectively.

As shown in FIG. 7, a groove is formed around the entire circumference of one plate 5e, and the sealing member 13 is attached to this groove to form the rotary blade 5 and the fixed wall 7, respectively. Good.

The fixing member 16 may be fixed to the rotary drive shaft 4 with a bolt.

The ceiling plate 9 and the bottom plate 10 may be constructed by superposing a large-diameter disk and a small-diameter disk and welding and fixing them. In this case, the boss portion 26 is constituted by a disc having a small diameter.

According to the present invention, the rotary blade 5 and the pressure resistant fixed wall 7 are provided.
The present invention can also be applied to a rotary actuator provided with and.

It should be noted that reference numerals are added to the claims for convenience of comparison with the drawings, but the present invention is not limited to the configurations of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 is a plan view showing a steering mechanism of a tractor.

FIG. 2 is a cross-sectional plan view of a rotary actuator.

FIG. 3 is a vertical sectional front view of a rotary actuator.

FIG. 4 is an exploded perspective view of a rotary drive shaft, rotary blades, and a fixed member.

FIG. 5 is a cross-sectional plan view of another embodiment.

FIG. 6 is a vertical sectional side view of another embodiment.

FIG. 7 is a vertical sectional side view of another embodiment.

[Explanation of symbols]

 4 Rotational Drive Shaft 5 Rotating Blade 6 Casing 7 Pressure Resistant Fixed Wall 13 Seal Member 14 Oil Chamber 15 Oil Chamber 16 Fixing Member 17 Second Fitting Groove 24 First Fitting Groove

Claims (2)

[Claims] 1. A casing (6) having a circular inner peripheral surface, which extends from a rotary drive shaft (4) penetrating on the axis of the casing (6) to the outside in the radial direction in a posture along the axis, and is provided on the entire circumference. A rotary blade (5) which is integrally rotatable with the rotary drive shaft (4) is provided while the seal member (13) is in close contact with the inner peripheral surface and the upper and lower inner surfaces of the casing (6), and the rotary drive shaft ( 4)
A pressure-resistant fixing partitioning the space in the casing (6) so that oil chambers (14), (15) independent from each other are formed on both sides of the rotary blade (5) by providing a seal member (13) for A wall (7) is provided in the casing (6), and hydraulic oil supply / discharge ports (19) and (22) communicating with the oil chambers (14) and (15) are provided at the fixed wall (7). Is provided in the vicinity of the rotary drive shaft (4) by supplying oil to one oil chamber (14) and draining oil from the other oil chamber (15) to apply hydraulic pressure to the rotary blades (5). A rotary actuator configured to oscillate and rotate, wherein the rotary blade (5) is formed separately from the rotary drive shaft (4), and the seal member (13) is provided over the entire circumference. The first fitting groove (24) mounted on the rotary drive shaft (4) and extending along the shaft core. A rotary actuator in which the base end portion of the rotary blade (5) is fitted and the rotary blade (5) is attached to the rotary drive shaft (4) in a circumferentially fixed position. 2. The pair of second fitting grooves (17) formed on the rotary drive shaft (4) and extending along the shaft core are respectively fitted with the base end portions of the pair of fixing members (16), Both fixing members (1
6) The first fitting groove (24) is formed between them, and the base end portion of the rotary blade (5) is fitted into the first fitting groove (24) to attach the rotary blade (5). The rotary actuator according to claim 1, wherein the rotary drive shaft (4) is fixedly mounted in the circumferential direction.