JPS6215523Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rotation device capable of fixing and holding an operating shaft rotated by fluid at a stop position.

In general, this type of rotation device is designed to fix and hold the operating shaft by tightening the outer peripheral surface of the operating shaft with a plurality of friction members. The actuating shaft must be centered and fixed in place, which is troublesome to manufacture, and in order to securely hold it in place, the actuating shaft must be lengthened in the axial direction or the shaft diameter should be set to an inappropriate value regardless of the operating load. However, there were drawbacks such as the need for large-sized devices.

In view of these drawbacks, the present invention provides a rotating device that is easy to manufacture, with an operating shaft that is provided with an optimal dimension according to the operating load, securely fixed and held.

Therefore, in the present invention, an operating shaft is provided that is rotatably mounted on the main body member and provided with external teeth, and a rack tooth is provided that intersects the operating shaft and slidably fits and meshes with the external teeth. The cylindrical member is provided with a rod that protrudes from the end of the piston and projects out of the main body member, and the cylindrical member is integrally disposed with the main body member by being fitted onto the protruding rod with an interference fit. , the outer fit between the rod and the cylindrical member so that the cylindrical member fitted onto the outer part of the tight fit expands in the radial direction and loosens the tightness.
A fluid introducing means for introducing pressure fluid is provided to fix and hold the operating shaft.

Hereinafter, one embodiment of the present invention will be described based on the drawings.

In FIGS. 1 and 2, 1 is a main body member of a rotating device, which has an operating shaft 2 and two pistons 3 and 4 inside, and the operating shaft 2 is provided with external teeth 5, and its both ends are The main body member 1 is rotatably mounted on the main body member 1 via bearings 6 and 7, with one end protruding to the outside. The two pistons 3 and 4 intersect with the operating shaft 2, are slidably fitted into fitting holes 8 and 9, and are provided with lock teeth 10 and 11 so as to mesh with external teeth 5.
12, 13, 14, 15 are lid members that close both open ends of the fitting holes 8, 9, and are fixed to the main body member 1 and have working chambers 16, 17, 1 between them and the ends of the pistons 3, 4.
8 and 19 are formed. 20, 21, 22, 2
3 is provided in each lid member 12, 13... for each action chamber 1.
6, 17, . . . to introduce and discharge pressure fluid. Reference numeral 24 denotes a rod protruding from one end of one piston 3, which passes through the lid member 12 and projects out of the main body member 1. 25 is a prominent rod 2
4 is a cylindrical member that is externally fitted with an interference fit and is integrally disposed on the main body member 1, and has holding members 26, 27 at both ends.
is fixed using multiple tie rods 28,
The cylindrical member 25 is formed between the rods 24 and the outer fitting space 2
When pressure fluid is introduced into the rod 9, the rod 24 expands in the radial direction and loosens the tightness of the rod 24. Reference numeral 30 denotes a flow path provided in the holding member 27 for introducing pressure fluid into the outer fitting space 29.

Next, the operation of this configuration will be explained.

In FIG. 1, the rod 24 is tightly fitted into the cylindrical member 25, and the operating shaft 2 is held fixed by the frictional force of contact between the rod 24 and the cylindrical member 24. To rotate the operating shaft 2 from this state, the flow path 3
When pressure fluid is introduced into the outer fitting gap 29 from 0, the cylindrical member 25 is expanded in the radial direction by the force of the pressure fluid acting on the inner circumferential surface, loosening the rod 24, and causing each flow 20, 22 and When pressure fluid is alternately introduced into each working chamber from 21 and 23, the two pistons 3 and 4 reciprocate in the axial direction, and the working shaft 2 moves left and right through the meshing of the external teeth 4 and the rack teeth 10 and 11. Rotated. Furthermore, in order to fix and hold the operating shaft 2, a fluid control valve or the like (not shown) is installed to prevent pressure fluid from flowing through each flow path 20, 21... communicating with each action chamber 16, 17, 18, 19. When the flow path 30 is opened to the low pressure side after stopping the two pistons 3 and 4, the cylindrical member 25 contracts by its own elastic force and tightly fits the rod 24, and the actuating shaft 2
is securely held in the stopped position.

With this operation, the piston 3 holds the operating shaft 2 fixedly.
Since the rod 24 protruding from the end is tightly fitted with the cylindrical member 25 by its own elastic force, a large fixing force is obtained, and the operating shaft 2 can be provided with the optimum dimensions according to the operating load. Accurate centering can be easily obtained and manufacturing is easier than in the conventional method which uses a plurality of friction members. In addition, by replacing the rod 24 and the cylindrical member 25 or installing them on the other piston 4, the fixing holding force can be easily changed, and a compact rotating device suitable for the purpose can be obtained.

In this way, the present invention has an operating shaft that is rotatably mounted on the main body member and provided with external teeth, and a rack tooth that intersects with the operating shaft and is slidably fitted and engaged with the external teeth. The cylindrical member is provided with a rod that protrudes from the end of the piston and projects out of the main body member, and the cylindrical member is integrally disposed with the main body member by being fitted onto the protruding rod with an interference fit. A large fixation holding force is achieved by providing a fluid introduction means for introducing pressure fluid into the outer fit between the rod and the cylindrical member so as to radially expand the cylindrical member fitted externally into the tight fit and loosen the tight fit. can be obtained, and the operating shaft can be set to the optimum dimensions according to the operating load.
Further, it can be easily manufactured, and has the advantage of being able to provide a small-sized rotating device that is most suitable for the purpose.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a rotating device showing an embodiment of the present invention, and FIG. 2 is a sectional view taken along the line - in FIG. DESCRIPTION OF SYMBOLS 1... Main body member, 2... Operating shaft, 3, 4... Piston, 24... Rod, 25... Cylindrical member.

Claims (1)

[Scope of utility model registration request] An operating shaft is rotatably mounted on the main body member and provided with external teeth, and a fluid-operated piston is provided with easy teeth so as to intersect with the operating shaft and slidably fit in and mesh with the external teeth. A rod is provided at the end of the piston and protrudes out of the main body member, and the cylindrical member is integrally disposed on the main body member by being externally fitted onto the protruding rod with an interference fit, and the cylindrical member is externally fitted with an interference fit. A rotating device comprising a fluid introduction means for introducing pressure fluid into an outer fitting between a rod and a cylindrical member so as to expand the cylindrical member in the radial direction and loosen the tightness.