JPS6216769B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of the Invention] The present invention relates to an improvement in a gear chuck device provided with a gear pin.

[Conventional technology and its problems]

A diaphragm chuck type gear chuck device has a plurality of gear pins that are loaded into a gear case and mesh with tooth grooves on the outer periphery of the gear as the diaphragm moves in and out. It is positioned and fixed inside.

These gear pins are made of hard metal such as high-speed steel, cemented carbide, or highly wear-resistant nitrided steel, and are held in pin insertion holes formed in the gear case so that they can move forward and backward in the radial direction. Conventionally, the tip of the gear was wedge-shaped or tapered depending on the pitch of the tooth profile of the gear.

However, for a gear pin with such a shape, the tip shape must match the tooth groove shape and pitch spacing of the tooth profile and be aligned with the center axis of the pin, so that it is accurately formed into a wedge or tapered shape. However, machining is extremely troublesome, and even if the tip shape is finished with high precision, slight differences in the tooth profile and tooth groove may occur due to pitch error etc. when meshing with the gear loaded in the gear case. As a result, only one surface of the tip comes into contact with the other, causing a decrease in positioning accuracy.

[Purpose of the invention]

This invention was made in view of the above-mentioned drawbacks of the conventional gear chuck device, and its purpose is to be able to easily manufacture the device without requiring high machining precision, and to compensate for differences due to pitch errors, etc. It is an object of the present invention to provide a gear chuck device which constantly meshes with the tooth grooves with high precision and which does not cause deformation of the contact surface.

[Structure and effects of the invention]

The present invention includes a diaphragm provided integrally with a diaphragm casing, a spacer inserted and fixed between the diaphragm casing and the diaphragm, a gear casing detachably attached to a screw hole of the spacer via a bolt, and the above-mentioned gear casing. A claw part is supported in the insertion hole of the gear casing via a clip, and has its tip opposed to the tooth groove of the gear to which the gear casing is fitted, while the other end is provided integrally with the diaphragm. a plurality of gear pins that engage with the diaphragm and protrude into the tooth grooves of the gear to position and clamp the outer periphery of the gear as the diaphragm moves in and out, the gear pin having a cylindrical shaft portion inserted into the insertion hole; It is characterized in that it is provided with a ball that is movably and rotatably provided at the tip of the shaft portion and that contacts the tooth groove of the gear.

As described above, this invention is configured so that the ball, which is loosely fitted in the tip of the shaft so that it can be moved minutely and rotatably, is brought into contact with the tooth groove to perform positioning clamping, so that the tip of the conventional shaft is formed into a tapered or wedge shape. Compared to conventional gear pins, the spherical surface contacts the tooth groove, which allows for highly accurate positioning even if the ball is not formed precisely according to the pitch of the tooth profile, and the ball is fixed to the tip of the shaft of the gear pin. Since the ball is movable, it is able to respond to minute deviations between the tooth profile and the tooth groove to ensure pitch line contact.The ball also makes contact while rotating, so it is not possible to use conventional tapered or wedge-shaped balls. Compared to conventional products, there is no wear such as uneven wear and there is no accompanying decrease in positioning accuracy.

Further, according to this invention, the gear casing is removably attached via bolts using a spacer inserted and fixed between the diaphragm casing and the diaphragm, so the diameter or pitch spacing of the gear that is the workpiece can be changed. Even in the event of a change in gear W, the gear casing can be easily removed by loosening the bolts, and the gear pin corresponding to the changed gear W can be appropriately selected and replaced, making tooling extremely easy to replace. has.

[Explanation of Examples]

FIG. 1 shows the main parts of a gear chuck device according to the present invention. A main shaft 2 formed with a main shaft 2, a central shaft 3 for clamp operation that slidably passes through the center of the main shaft 2, a diaphragm casing 5 attached to the end surface of the flange portion 2 via a mounting plate 4, A diaphragm 6 integrated into the tip surface of the diaphragm casing 5
A gear casing 8 is attached to the diaphragm 6 with a predetermined gap therebetween via a spacer 7 that protrudes through the diaphragm 6. The gear casing 8 has a screw hole 7a in the spacer 7.
It is removably attached therein via bolts 20.

A concave gear storage hole 8a is formed in the center of the gear casing 8, and three pin insertion holes 9 (not shown in the figure) are arranged at equal third intervals on the side of the hole 8a to match the tooth grooves of the gear. (Only one location shown)
are drilled in the radial direction, gear pins 10 are inserted into these pin insertion holes 9, and clips 11 made of piano wire or the like are passed through perpendicularly to the insertion direction.
It is held within the insertion hole 9.

The gear pin 10 has its tip protruding into the tooth groove of the gear W, and the protruding end from the gear casing 8 has a plurality of claws integrated with the tip surface of the diaphragm 6, that is, a clamp block 12. The center of the diaphragm 6 is in contact with the diaphragm casing 5.
It is opposed to the central shaft 3 which protrudes through the center of the shaft.

FIG. 1 shows a state in which the center shaft 3 is spaced apart from the diaphragm 6. In this state, the diaphragm 6 is flat, and therefore the clamp blocks 12 are urged toward the center, and as a result, the gear pin 10 is clipped. 11 is made to protrude into the gear casing 8 while being elastically deformed, its tip is engaged with the tooth groove of the gear W, and its outer periphery is positioned and clamped.

Further, by protruding the center shaft 3 from this state and bringing it into contact with the inner surface of the diaphragm 6, the center of the diaphragm 6 bulges out, and as a result, each clamp block 12 moves outward, and the clips 11
The gear pin 10 is configured to move due to the elastic return force and release the clamp on the outer periphery of the gear W.

In the figure, reference numeral 13 denotes an oil feed pipe whose one end is connected to the end surface of the main shaft 2 and whose other end is connected to the gear casing 8 through the diaphragm case 5 and the diaphragm 6, and which is connected to the bearing block 1. A part of the lubricating oil supplied between the main shaft 2 and the main shaft 2 is supplied to the spiral groove 14 carved in the inner circumferential surface of the insertion hole 9 through the oil pipe 13. By spouting from between the outer opening and the gear pin 10, the gear pin 10 of chips accompanying cutting or cutting of the gear W is removed.
This prevents intrusion into the sliding surface.

The gear pin 10 in the gear chucking device configured as described above influences the positioning accuracy of the gear W, and as shown in FIGS. 2 and 3, the gear pin 10 is inserted into the insertion hole 9. A cylindrical shaft 101 that is inserted through the shaft, a projection 102 with a smaller diameter than this projecting from the tip of the shaft 101, a pair of support plates 103, 103 erected around the outer circumference of the projection 102, and Support plate 10
3 and a ball 104 loosely fitted in a small chamber surrounded by a protrusion 102 so as to be rotatable and movable.
The balls 104 are made of hard metal such as cemented carbide, and have their outer peripheral parts protruding from the peripheral edges of each support plate 103. The distal end of the portion 101 is held with a predetermined backing so that it can be moved minutely in the axial direction and in the direction perpendicular to the axis.

Note that 101a in the figure is a clip insertion hole.
Therefore, with the gear pin 10 configured as described above, when the tip of the gear pin 10 is projected into the tooth groove of the gear W as shown in FIG. If there is a misalignment, the ball 104 rotates and comes into contact with one of the tooth grooves and moves in a direction perpendicular to the axial direction due to the taper, and in the final clamped state, the ball 104 touches both sides of the tooth groove. The gear W is clamped while being located between the three points at the tip of the protrusion 102.

As is clear from the above description, the gear chuck device according to the present invention can achieve highly accurate positioning even if the tip is not formed with high precision, compared to the conventional gear pin whose tip is formed into a tapered or wedge shape. In addition, there is no wear such as uneven wear and the resulting decrease in positioning accuracy, and since the gear casing is detachably attached via bolts, tooling is extremely easy to replace. have an effect.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a gear chucking device according to the present invention, Fig. 2 is a front view of a gear pin, and Fig. 3 is a sectional view of a gear chucking device according to the present invention.
The figure is a sectional view taken along the line -- in FIG. 5...Diaphragm casing, 6...Diaphragm, 7...Spacer, 9...Pin insertion hole, 1
0...Gear pin, 12...Claw part (clamp block), 20...Bolt, 101...Shaft part, 10
4...Ball, W...Gear.

Claims (1)

[Scope of Claims] 1. A diaphragm provided integrally with a diaphragm casing, a spacer inserted and fixed between the diaphragm casing and the diaphragm, and a gear detachably attached to a screw hole of the spacer via a bolt. a casing, which is supported in the insertion hole of the gear casing via a clip, and has its tip facing the tooth groove of the gear that is fitted and installed in the gear casing, while the other end is integrally formed with the diaphragm. It is comprised of a plurality of gear pins that engage with provided pawls and protrude into the tooth grooves of the gear as the diaphragm moves in and out to position and clamp the outer periphery of the gear, and the gear pin has a cylindrical shape that is inserted into the insertion hole. 1. A gear chucking device comprising: a shaft portion; and a ball that is movably and rotatably provided at the tip of the shaft portion and comes into contact with a tooth groove of a gear.