JP2521347Y2 - Floating joint - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION "Industrial field of application" The present invention relates to an improvement of a floating joint that is connected between a driven body and a propulsion body to absorb tilt misalignment and parallel misalignment.

“Prior art” Conventionally, when a slide table or a slide base of a press, which is a driven body, is operated by a cylinder or the like that is a propelling body, it takes time for centering, processing accuracy adjustment, and assembly adjustment. I was having a hard time. Therefore, a floating joint that absorbs misalignment has been considered, and for example, in cylinders, attempts have been made to solve problems such as being unable to be pushed all the way to the stroke end, the rod bending, and the rod metal slipping.

Therefore, this conventional floating joint will be described with reference to FIGS. First, in a conventional example shown in FIG.
A stud 101 is formed by projecting a shaft portion 101b on the 101a and providing a stud-side connecting portion 101c of a male screw on the shaft portion 101b. Then, the sphere 101a is held between two sliding rings 102, 102 having surfaces concentric with the center of the sphere 101a, and.
The rear surface 102a, 102a of each sliding ring 102, 102 is held between the case 104 and the socket 105 with a minute gap, and the stud 10
The male screw stud-side connecting portion 101c provided in 1 is connected to the female screw outer shell-side connecting portion 103 provided in the case 104.
Spherical rocking and eccentric slide with respect to a. Further, the dust cover 106 is inverted from one end of the cylindrical holding portion 106a while conically expanding, further extends in the direction perpendicular to the axis, and further has a fixing portion 106d at the end extending in the axial direction. This dust cover 106 has this shape when it is manufactured as a single item. Then, the root portion 101e of the shaft portion 101b is seal-fixed by the holding portion 106a, and the fixing portion 106d is fixed in the groove of the case 104. Then, the grease filled in the case 104 is prevented from leaking to the outside and intrusion of dust from the outside. Next, in another conventional example shown in FIG. 10, the dust cover 106 is a seal plate 106b whose diameter is conically expanded from one end of a ring-shaped holding portion 106a. The seal plate 106b is in contact with the flat surface of the side wall 103b of the case 104.

"Problems to be solved by the invention" By the way, such a conventional floating joint had the following problems.

In one conventional example shown in FIG. 9, the outer diameter of the case 104 on the stud 101 side cannot be the outer shell side tool hooking portion 104b, or the dust cover 106 is fixed at two places,
If the material was made quite soft, and the slack and the elongation when pulled were not sufficient, the grease might protrude from the shaft portion 101b. Further, in another conventional example shown in FIG. 10, the seal plate 10 is used at the time of spherical swing and eccentric slide.
6b may come off or collide with the side wall 103b of the case 104, or the contact surface pressing force of the seal plate 106b may be weakened so that the grease may stick out.Therefore, it is necessary to increase the length of the seal plate 106b. was there. Therefore, the length of the shaft portion 101b of the stud 101 is long.
And, it has not been able to cope with the recent downsizing of devices.

This invention was created in view of the above circumstances.

"Means for Solving the Problems" Means for solving the above problems will be described below with reference to FIGS. 1 to 8 corresponding to the embodiments.

The sphere of the stud 1 in which the sphere 1a is attached to one end of the shaft portion 1b
1a is held between two sliding rings 2 and 2 having surfaces concentric with the center of the spherical body 1a, and the sliding rings 2 and 2 are sandwiched.
Each of the back surfaces is held by an outer shell portion 3 including a case 4 and a socket 5 with a small gap, and a stud-side connecting portion 1c provided on the shaft portion 1b is provided on the outer shell portion 3. In a floating joint that swings spherically and eccentrically slides with respect to the outer shell side connecting portion 3a, the side wall 3b of the outer shell portion 3 on the shaft 1b side is formed into a smooth conical concave wall without uneven grooves. 3c, having a cylindrical holding portion 6a for sealing the root portion 1e of the shaft portion 1b, and conically expanding from one end, when performing maximum spherical swing and eccentric slide,
In addition to having a length in contact with the conical concave wall 3c, the conical concave wall 3c and the enlarged-diameter side are closely opposed to each other, and the conical concave wall 3c is slid while pressing the conical concave wall 3c with the seal plate 6b being inverted. An elastic dust cover 6 having the movable seal plate 6b is mounted.

"Operation" A propelling body 9 such as a cylinder is connected to one of the outer shell side connecting portion 3a and the stud side connecting portion 1c, and an operated body 8 such as a slide base is connected to the other. Then, the outer shell side connecting portion 3a
When there is a tilt misalignment or a parallel misalignment between the stud-side connecting portion 1c and the stud-side connecting portion 1c, the width between the back surfaces of the sliding rings 2 and 2 does not change due to the concentric pivot structure having the minute gaps.
The spherical rocking and the eccentric slide can be performed individually or in a composite state.

Then, the holding portion 6a of the dust cover 6 fitted from the end of the shaft portion 1b is attached to the root portion 1e, and the seal plate 6b is opened to contact the conical concave wall 3c of the outer shell portion 3. Therefore, since the end portion of the seal plate 6b of the dust cover 6 is not fixed to the outer shell portion 3, the conical concave wall 3c of the outer shell portion 3 is suitable for spherical rocking and eccentric slide. The pressing force allows it to freely slide on the contact surface and maintain a long service life. Then, the grease in the storage chamber 4a does not leak to the outside and dust does not enter from the outside. Then, it is easy to attach to the narrow portion of the shaft portion 1b and is compact. Further, since the seal plate 6b pushes the conical concave wall 3c, a reaction force is exerted, and the holding portion 6a is pushed by the root portion 1e, so that a stable and difficult displacement is added.

[Embodiment] The present invention will be described in more detail with reference to the drawings.

1 to 3 show an embodiment of the present invention. FIG. 1 shows a state without spherical swing and eccentric slide, FIG. 2 shows a maximum spherical swing and eccentric slide state, and FIG. 3 shows a dust cover. Reference numeral 1 denotes a stud-side connecting portion that has a shaft portion 1b integrally formed and protrudes in a substantially spherical sphere 1a, has a hole penetrating from the end face of the shaft portion 1b into the sphere 1a, and has a female screw halfway. It is a stud with 1c. The outer diameter of the spherical body 1a is larger than that of the shaft portion 1b. Further, the shaft portion 1b has a smaller diameter than the inner diameter of the sliding ring 2 on the loose insertion side of the shaft portion 1b at the time of assembly, and has a two-way, four-way, or six-way stud side on the outer diameter portion. A tool hook 1d is provided. 2 is
A washer-shaped sliding ring that is concentric with the spherical body 1a and has a surface for holding and sliding the spherical body 1a. Reference numeral 4 is a case in which a male-screw outer shell side connecting portion 3a is provided at one end, and a flat bottom storage chamber 4a in which the back surfaces 2a of the sliding rings 2 and 2a slide is provided at the other end. An outer shell side tool hooking portion 4b, such as a two-way, four-way, or six-way tool, is provided on the outer diameter portion. Further, the inner diameter of the storage chamber 4a is larger than the outer diameters of the sliding rings 2 and 2 by the eccentric slide amplitude. Reference numeral 5 is a washer-shaped socket having a hole into which the shaft portion 1b of the stud 1 is loosely inserted and a surface on which the back surfaces 2a, 2a of the sliding rings 2, 2 slide. Then, the sphere 1a of the stud 1 is held between two facing sliding rings 2 and 2, and the rear surfaces 2 of the sliding rings 2 and 2 are held.
A and 2a are held and screwed between the case 4 and the socket 5 with a minute gap. The case 4 and the socket 5 have a similar shape depending on the combination method and it is difficult to separate them. Therefore, the case 4 and the socket 5 are combined to form the outer shell 3. Reference numeral 6 is an elastic dust cover which has a cylindrical holding portion 6a having an inner diameter slightly smaller than that of the root portion 1e of the shaft portion 1b and which is conically expanded from one end. The outer diameter of the connecting portion between the holding portion 6a and the seal plate 6b is an annular concave surface 6c. Then, the side wall 3b of the outer shell portion 3 on the side of the shaft portion 1b is made into a conical concave wall 3c, and the stepped root portion 1e of the shaft portion 1b is sealed by the holding portion 6a, and at the inner surface side of the seal plate 6b, the cone is formed. The concave surface 3c is slidable on the contact surface with an appropriate pressing force. It should be noted that the length of the seal plate 6b may be as long as the conical concave wall 3c in the state of the dust cover 6 in the lower half of FIG. Second
The state of the dust cover 6 in the upper half of the figure is the state where the seal plate 6b and the holding portion 6a are closest to each other, but the presence of the annular concave surface 6c allows the seal plate 6b and the holding portion 6a to be closer to each other. It has the effect of being acceptable. Therefore, the dust cover 6 can be made narrower. Further, in order to further facilitate smooth sliding, the storage chamber 4a is filled with grease. Reference numeral 7 is a pin for locking the case 4 and the socket 5 together.

Then, the operated body 8 such as a slide base is screwed into the outer shell side connecting portion 3a of the male screw, and the outer shell side tool hook 4b of the floating joint is held and fixed by tightening with a monkey, a wrench or the like. .
Further, the male screw of the propelling body 9 such as a cylinder or a press is screwed into the stud-side connecting portion 1c of the female screw, the longitudinal direction is adjusted, and the nut 10 is fixed. At this time, the stud-side tool hook 1d is held by a monkey, a spanner, etc., and the nut 10 is held by another monkey, a spanner, etc. and tightened and fixed.

The outer diameter of the sliding rings 2 and 2 is equal to the storage chamber of the case 4.
The sphere 1a concentrically held by the sliding rings 2 and 2 moves in parallel until it hits the inner diameter of 4a.
It swings at an angle with respect to 2. Therefore, the stud side connection part 1c
The propelling body 9 attached to the outer shell side connecting portion 3a and the driven body 8 attached to the outer shell side connecting portion 3a perform power transmission smoothly even if there is a misalignment or a misalignment.

FIG. 4 shows another embodiment of the present invention. In this embodiment, the conical concave wall 3c of the first embodiment shown in FIG.
Instead, the outer shell 3 on the side of the shaft 1b may be provided on the case 4. Other configurations are the same as those of the above-described embodiment, and have the same operation and effect as those of the above-mentioned embodiment.

FIG. 5 shows still another embodiment of the present invention. In this embodiment, a male-screw outer shell side connection portion 3a is provided on the large-diameter outer diameter portion of the case 4 outside the storage chamber 4a. The outer shell portion 3 on the side of the shaft portion 1b is provided with a two-sided, four-sided, or six-sided outer shell side tool hooking portion 4b.
The other points are the same as in the first embodiment. Since the floating joint having this shape cannot be realized by the dust cover 106 of the conventional example shown in FIG. 9, the effect of the structure of the dust cover portion of the present invention is particularly great.

FIG. 6 shows still another embodiment of the present invention. In this embodiment, a stud 1 having a male screw is used in place of the stud 1 having a male screw shown in FIG. 1, and a propelling body 9 having a female screw like a thin cylinder is screwed. You can also

FIG. 7 shows a dust cover according to another embodiment of the present invention. Although there is no annular concave surface 6c having the outer diameter of the connecting portion between the holding portion 6a of the second dust cover and the seal plate 6b, the basic effect is the same.

FIG. 8 shows a dust cover according to another embodiment of the present invention. Second conical seal plate 6b of the dust cover shown in the figure
Is a curved cone like a morning glory flower. Then, there are the same operational effects as those of the above-mentioned embodiment.

In the above embodiment, the propelling body 9 and the driven body 8 are
And can be connected to either side of the stud side connecting portion 1c or the outer shell side connecting portion 3a.

Further, synthetic rubber can be generally used for the elastic dust cover 6. A Shore hardness of 60 to 80 degrees is suitable, but a Shore hardness of about 50 to 90 degrees can be used.

"Effect of device" The advantages of the device are as follows.

The dust cover 6 has a narrow width and can be mounted compactly on the base portion 1e of the shaft portion 1b, and is a shortened floating joint. Further, unlike the conventional example shown in FIG. 9, a complicated and expensive mold is not required, and when attaching the dust cover, it is difficult to attach and does not require man-hours, and the holding portion 106a and the fixing portion 106d are provided. Due to the two fixing points, especially in the case of a small size, the holding portion 106a is not pulled and grease leaks when the spherical surface is swung or eccentric slides, and further, the fixing portion 106d is provided. For the case
It must be fixed to the outer diameter, and there is no possibility that a floating joint having the shape as in the fifth embodiment of the present invention shown in FIG. 5 cannot be formed. Further, as in another conventional example shown in FIG. 10, the seal plate 106b is attached to the case 10 during spherical rocking and eccentric sliding.
4 has a poor followability with respect to the side wall 103b, and is dislocated from or bumped against the side wall 103b, and the seal plate 106b
Since the pressing force of the contact surface of the stud 101 is weak and the grease may squeeze out, the length of the seal plate 106b must be lengthened, and therefore the length of the shaft portion 101b of the stud 101 becomes long and the floating joint. There is no such thing as that it cannot be shortened.

In this way, in addition to solving various conventional drawbacks, the maximum effect, the axial length, has been greatly shortened, and it was shocking to be competing for a reduction of several millimeters. .
Further, since the case does not protrude to the outside and the outer diameter of the case, the case can be easily dealt with even if it is a flat flange type or a foot type.

[Brief description of drawings]

1 is a sectional view showing an embodiment of the present invention, FIG. 2 is a sectional view showing the same embodiment of the present invention at the time of maximum spherical rocking and eccentric sliding, and FIG. 3 is the same embodiment of the present invention. Sectional view showing an example dust cover, FIGS. 4 to 6 are sectional views showing another embodiment of the present invention, and FIGS. 7 to 8 are sectional views showing a dust cover of another embodiment of the present invention. 9 to 10 are sectional views showing a conventional floating joint. 1 stud, 1a sphere, 1b shaft, 1c stud side connection, 1d stud side tool hook, 1e root, 2 slide ring, 2a back 3 ... Outer shell, 3a
...... Outer shell side connection part, 3b ...... Side wall, 3c ...... Conical concave wall, 4
…… Case, 4a …… Storing room, 4b …… Outer shell side tool hook,
5 ... Socket, 6 ... Dust cover, 6a ... Holding part,
6b …… Seal plate, 6c …… annular concave surface, 7 …… pin, 8 ……
Operated body, 9 ... Propulsion body, 10 ... Nut.

Claims (1)

(57) [Scope of utility model registration request] 1. A stud (1) having a sphere (1a) attached to one end of a shaft (1b), the sphere (1a) having two surfaces having a surface concentric with the center of the sphere (1a). Sliding ring (2),
The outer shell part (3), which is held by (2) and has a small gap on the back surface of each of the sliding rings (2) and (2), is composed of a case (4) and a socket (5). Hold the shaft (1b)
The stud side connection part (1c) provided on the outer shell part (3)
In a floating joint that swings spherically and eccentrically slides with respect to the outer shell side connection portion (3a) provided in the shaft portion (1b)
The side wall (3b) of the outer shell portion (3) on the side is a smooth conical concave wall (3c) having no concave and convex grooves, and a cylindrical holding portion (1e) for sealing the root portion (1e) of the shaft portion (1b) ( 6a) and has a diameter that conically expands from one end and has a length that is in contact with the conical concave wall (3c) when performing maximum spherical rocking and eccentric slide, Make the wall (3c) and the expanded side closely face each other,
Floating characterized by mounting an elastic dust cover (6) having the seal plate (6b) slidable while pressing the conical concave wall (3c) with the belly surface which is the inverted seal plate (6b) Sex fittings.