JPH03103603A - Key device - Google Patents

Abstract

PURPOSE:To secure smooth sliding even with a large shearing stress applied by forming a cut for directly escaping is formed on an outer periphery surrounding a position contacting a border face of a cylinder and an inner cylinder and providing an engaging part for preventing a rotation with the cylinder center axis of a cylindrical key groove as a center. CONSTITUTION:An engaging groove 2f and an engaging piece 2g of an engaging part are formed at the end of a cylindrical key 2 formed by arcs 2c, 2d and a plane 2b. The key 2 is fixed together with an engaging jig 4 inside a key groove 1a of a cylinder 1 housed in a key groove 3a of an inner cylindrical body 3. Therefore, the key 2 can be longer with durability and reliability increased while the key grooves 1a, 3a can be processed with a drill so that fitting can be highly precise.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a key device interposed between two rotating and mutually slidable members.

For example, the present invention relates to a key device that can be applied as an alternative to a conventional spline shaft or serration shaft.

[Prior art]

Conventional spline shafts or serration shafts are capable of both rotating and sliding operations at the same time, but they have a drawback in that they have a lubricating structure and require regular lubricating.

In response, the applicant filed Japanese Patent Application No. 62-19137.
We have presented the technical idea of a cylindrical key as shown in No. 0.

FIGS. 1(A) and 1(B) show the outline thereof, FIG. 1(A) is a key structure diagram, and FIG. 1(B) is an operation explanatory diagram.

In the figure, 2 is a key, 21 is a locking part, 25 is a slit,! 3 is a cylindrical body, 3 is an inner cylindrical body, and la and 3a are cylindrical keyways with semicircular cross sections.

As shown in Figure (B), the key 2 is interposed between the cylinder body 1 and the inner cylinder body 3,
The paper rotates the paper and slides in a direction perpendicular to the plane of the paper.

〔problem〕

However, during startup or rotation, the keyway 1 of the cylindrical body 1
The groove end A of the key groove 3a of the inner cylinder body 3 and the groove end B of the key groove 3a of the inner cylinder 3 mutually act as a knife edge with respect to the key 2.
Rotate while pressing.

However, at this time, the inner cylindrical body 3 is moved in the axial direction (
Even if you try to slide it in the direction perpendicular to the page, the groove end A
Since the keys 1 and 2 are deeply embedded in the key 2, there is a drawback that mutual sliding operations are prevented.

In particular, if the length of the key 2 in the axial direction is increased for stable rotation of the cylindrical body 1 and the inner cylinder 3, the contact distance between the key 2 and the groove ends A, B is also increased, and both groove ends A, Since key 2 is pinched with great force at B, smooth operation may be completely prevented.

[Purpose of the invention]

This invention was made to solve these drawbacks, and it is an object of the present invention to provide a key device for a rotating sliding body that guarantees smooth sliding even when a large shear stress is applied to the key itself. The purpose is

[Technical means for solving the problem] The key device of the present invention has a cylindrical keyway that spans the cylindrical body and the inner cylindrical body with their sliding surfaces as boundaries, and a cylindrical keyway is provided in the keyway. In addition to arranging the key, the cylindrical key is provided with a notch for contact and escape on the outer peripheral surface around the position where it abuts the sliding surfaces of the cylindrical body and the inner cylindrical body, and the cylindrical key It has a structure in which a locking portion is formed to prevent the groove from rotating about its cylindrical axis.

(Function) According to this configuration, the key device itself is provided with a notch, and the groove end of the cylindrical keyway does not come into direct contact with the outer peripheral surface of the key due to the presence of the notch. The two groove ends act as knife edges, preventing the key from getting wedged.
The rotating sliding body always operates smoothly in both rotational and sliding motions.

(Embodiment) Figures 2 (A), (B), (C) and (D) show a key device according to an embodiment of the present invention, where Figure (A) is a perspective view and Figure (B)
is a front view, Figure (C) is a sectional view taken along the line C-C of Figure (B), Figure (
D) is a cross-sectional view taken along line D-D.

In the figure, 2 is an octal key that is approximately octagonal in shape. 2a is a cutout, 2b is a flat surface, and 2c and 2d are arcuate portions of a circle centered on the central glaze OI. 2f and 2g
forms a locking portion, 2f is a locking groove, and 2g is a locking side.

Figures 3 (^) and (B) show the state of the same embodiment of the key device applied to an actual rotating and sliding device, Figure (A) is a cross-sectional configuration diagram, and Figure (B) is its state. It is an operation explanatory diagram.

In the figure, 1 is a cylindrical body, 1a is a substantially semicircular keyway, 1b is an oil passage, and 1c is an oil reservoir. 2 is the key,
3 is an inner cylindrical body. The inner cylindrical body 3 is provided with a keyway 3a having a substantially semicircular cross section. As shown by arrows X and Y, the cylindrical body 1 rotates in the direction of arrow Z, while the inner cylinder 3 slides in the direction of arrow X with respect to the cylindrical body 1. However, in this embodiment, since the key 2 is supported and fixed on the cylindrical body 1 side, the key groove 3a on the inner cylindrical body 3 side is extended and an extension portion 3b is provided. In this embodiment, the inner cylindrical body 3 is slid, but the cylindrical body 1 may be slid relative to the inner cylindrical body 3 in the direction indicated by the arrow Y.

Numeral 4 is a locking tool for preventing the key 2 from falling off, and is fixed to the cylindrical body 1 with screws 6. On the other hand, 7 is a sealing lid that seals the free end side of the cylindrical body 1 and prevents the lubricating oil 8 from leaking.

Next, the operation of the key device of this embodiment will be explained with reference to FIG. 3(B). Assuming that the cylindrical body 1 and the inner cylindrical body 3 are rotating in the direction of arrows V to U in the figure while being subjected to an eccentric force, the outer diameter of the key 2 and the key grooves 1a to 3 are
The inner cylindrical body 3 is slightly displaced to the position indicated by the broken line with respect to the cylindrical body 1 according to the fitting tolerance of the inner diameter of a.

However, in this state, both the groove end A of the cylindrical body 1 and the groove end B of the inner cylinder 3 cannot directly contact the key 2 due to the notch 2a provided on the outer peripheral surface of the key 2. do not have.

This means that the two groove ends A and B do not act as knife edges. Therefore, since the key 2 itself is not pinched from both sides, the inner cylindrical body 3 receives the acting force from the outside without d1, and the key 2 @O
Even if you move the key 2 up and down parallel to t (arrow O or P),
is subjected to an even-odd force in the diagonal direction of the arrow N, and the arc portion 2
The abutment at d ensures smooth operation.

When starting or accelerating from the cylindrical body 1 side, an even-odd force acts in the direction of the diagonal line N mentioned above, but conversely, when a load with large inertia is stopped or decelerated, it acts in the direction of the diagonal line M, contrary to the above. As shown in FIG. 3(A), the key 2 is rotated around the central axis 01 of the key 2 as a result of the end of the ring-shaped locking tool 4 being placed at the position of the locking groove 2f. The key 2 itself is prevented from rotating.

Furthermore, in this example, as is clear from FIG. 3(A),
The cylindrical keyways 1a and 3a are drilled at the same time as indicated by the arrow W. For this reason, when using an end mill, it is difficult to improve the accuracy of the inner diameter due to misalignment in the longitudinal direction (axial direction), whereas when using a drill, the inner diameter has extremely high precision, making it difficult to fit the cylindrical key 2. Gold precision can be significantly improved. Moreover, as a result, it is possible to manufacture keys that are extremely long in the longitudinal direction, so there is no damage caused by aiming caused by fitting errors, and stable rotation and sliding motion that lasts for a long period of time is ensured.

[Other Examples]

The key device of the present invention is not limited to the case where the key groove is machined with a drill as described above, but may be one that is machined with an end mill.

However, the locking portion may be processed. It is clear to those skilled in the art that the locking part may be of any other type.

Further, in all of the above embodiments, the material of the key 2 is solid wood, but like the fourth d vertical, a slit 25 is added to the material to give it elasticity and momentum, or it is formed into a cylindrical shape. Those skilled in the art can easily absorb shock during startup or take measures to improve lubricity around the keyway.

〔Effect of the invention〕

According to the key device of the present invention, not only does the key itself not get caught at the end of the keyway due to even-odd force during rotation, but also various derivative effects are achieved. First of all, it allows keys to be made longer.

In other words, when the key is short, even if the end of the keyway acts as a knife edge, if the force that causes the sliding movement is large, the sliding movement can be performed, but if the knife edge heals over a long distance, the sliding movement cannot be performed reliably. However, the present invention ensures proper operation even for long keys. The realization of a long key means that the durability and reliability of the rotary sliding body to which it is applied will be significantly increased even if the rotating sliding body undergoes frequent sliding operations. Furthermore, the fitting accuracy between the Company 2 key and the key groove can be significantly improved. That is, by machining the keyway by drilling, the tolerance of the inner diameter of the keyway and the outer shape of the cylindrical key can be improved as desired, and durability and reliability are also increased in this respect.

[Brief explanation of drawings]

1A and 1B show a conventional key device, FIG. 1A is a perspective view thereof, and FIG. 1B is an explanatory diagram of its operation. (B). (C) and (D) show the key device of the present invention, the same figure (A) is a perspective view, the same figure (B) is a front view, and the same figure (C) is a line CC in figure (B). The cross-sectional view and FIG. ^) is a sectional view thereof, FIG. 4(B) is an explanatory diagram of its operation, and FIG. 4 is a sectional view of an application example of a key device according to another embodiment of the present invention. In the figure, 1... Cylindrical body, 2... Key device, 2a... Notch, 2c, 2d... Arc part, 2f... Locking groove, 2g...
...Latching edge, 3...Inner cylinder body, 10...Rotating sliding body Fig. 2 (A) Fig. 4 (A) Fig. (B) Fig. 3 (B) Fig. 3 (A)

Claims (5)

[Claims] (1) In a key device applied to a rotary sliding device in which a cylindrical keyway is provided on the boundary surface between the cylindrical body and the inner cylindrical body, the area around the position that abuts the boundary surface between the cylindrical body and the inner cylindrical body is A key device having a notch formed on the outer circumferential surface for contact and rotation, and further provided with a locking portion that prevents the cylindrical keyway from rotating about the cylindrical central axis. (2) The key device according to claim 1, wherein the cutout portion of the key device is formed by forming arcuate portions at the four corners of a square piece with a square cross section, thereby forming a flat portion between the two arcuate portions as the cutout portion. . (3) The key device according to claim 2, wherein the cutout portion of the key device is formed by providing a D-cut surface to a round rod having a circular cross section. (4) The cylindrical keyway formed between the cylindrical body and the inner cylindrical body is opened at one end in the axial direction, and a closing device is provided at this open end to prevent the key device from falling off, and the closing device is The key device according to claim 1, wherein the key device is prevented from rotating by engaging with the locking portion. (5) The key device has a circular or C-shaped cross section in a plane perpendicular to the axis, and is provided with elasticity to absorb shear stress between the cylindrical body and the inner cylinder. A key device according to claim 1.