JPH11108185A - Divided boot and assembling method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve flexibility of a divided boot, strengthen coupling force, facilitate the supply of lubricating oil and assembly of the divided boot, and facilitate the injection of the lubricating oil. SOLUTION: An outer boot 21 is fitted to an inner boot 1, and when a lubricating oil is injected from a lubricating oil injection hole 35 provided on the inner boot 1 to fit the outer boot 21, a sealing part is fitted to the lubricating oil injection hole 35. Further, the sealing part is fitted to the lubricating oil injection hole 35 together with a fitting of the inner boot 1 to a coupling, an injection from the lubricating oil injection hole 35, and a fitting of the outer boot 21 to the inner boot 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a split boot for assembling a universal joint such as a driving device with an axial space between split surfaces, and a method for assembling the split boot.

[0002]

2. Description of the Related Art In the prior art relating to the present invention, there is provided a split boot shown in FIGS. FIG. 20 is a perspective view of the split boot. FIG. 21 is a cross-sectional view showing a state where the divided surfaces are combined. Further, FIG.
FIG. 6 is a cross-sectional view of a boot cut along a connecting portion of a divided portion in which only the divided portion is improved by improving the divided boot.

In FIG. 20, a bellows-like boot 51 is
An annular concave portion is formed at one location in the axial direction, and one of the divided surfaces is formed on the insertion piece 52 so that it can be connected to the other, and the other divided surface is connected to the insertion piece 52. 55.

FIG. 21 shows that the insertion piece 52
In a press-fitted state. In this FIG.
The insertion piece 52 provided on one of the divided surfaces is formed in an arrowhead shape from the divided surface, and is provided with a locking step portion 53 bulging on both sides.
The locking step 53 is formed on an inclined surface 54 that is squeezed from both sides toward the tip. This insertion piece 52
It is formed over the entire length in the axial direction along the bellows-like divided surface.

[0005] Next, an annular concave portion 55 is formed on the other divided surface so that the insertion piece 52 can be inserted. The annular concave portion 55 is opened with a projecting piece 56 on the dividing surface side, and the inside thereof is formed in a space having a triangular cross section so that the distal end side of the inserting piece 52 can be engaged with a gap. . In order to form the annular concave portion 55, the boot 51 is formed to have an unnecessarily thick wall thickness, or as shown in FIG.

When the insertion piece 52 is press-fitted into the annular recess 55, the insertion piece 52 is fitted in a state as shown in FIG. 21, the locking step 53 is locked to the overhanging piece 56, and the two divided surfaces are connected to each other. Try to keep.

[0007] When the boot 51 is mounted on the universal joint 70 and operates, the flexibility of the boot 51 is deteriorated when the entire boot 51 is thick.
As the drive shaft 72 moves, an excessive force acts on the connecting portion. If only the connecting portion is thick, excessive force acts on the thin portion and only the thin portion is greatly deformed.

A boot 61 shown in FIG. 23 exists as another conventional technique which is an improvement of the conventional technique. FIG.
It is sectional drawing of the connection part in the state which combined the division part of this boot 61.

The boot 61 is a boot 5 shown in FIG.
The molded portion made of rubber material other than 1 and the connecting portion is formed in substantially the same shape. However, on the outer peripheral side of the annular concave portion 55 that is the connecting portion, a wire is bent into a U shape, and a large number of the U shape wires are continuously formed in a row to form a reinforcing member 62, which is embedded. Also, a plate-like material 63 in which a large number of wires are folded to a predetermined length and arranged in a row is embedded in the insertion piece 52.

[0010] By inserting the insertion piece 52 into the annular concave portion 55, the divided portions of the boot 61 are connected.

The operation of the boot 51 shown in FIG. 23 when the universal joint 70 is operated also decreases the flexibility of the connecting portion due to the reinforcing member 62 and the plate-shaped member 63, so that a force is applied only to the thin portion. In this case, stress is concentrated on the thin-walled portion and the film is greatly deformed.

When the above-mentioned three conventional boots 51 are assembled to a universal joint, the boot 51 is connected to the universal joint 70.
Grease is applied to the sliding part of the universal joint before assembling the fitting part, and the fitting part 58 and the mounting part 59 on both ends of the boot 51 are attached.
Are fitted to the shaft 71 and the outer shaft 72 of the universal joint 70 and fastened by the band 57.

[0013]

However, the boot 51 shown in FIG. 20 is formed in a bellows shape and is made of a rubber material so as to be flexible. For this reason, one insertion piece 52 is connected to the other annular recess 5.
At the time of insertion and fixation to 5, the rubber material has a large friction, so it is difficult to insert. In addition, since it is bent in a bellows shape, insertion becomes more difficult, and the working efficiency is reduced.

Also, due to the structure of the connecting portion of the boot 51, if the thickness of the boot 51 is thick, the flexibility of the entire boot 51 deteriorates, and the boot 51 is bent with the operation of the universal joint. If there is, there is a possibility that the connecting portion may come off. Then, the grease on the sliding portion side flows out.

Further, when only the connecting portion is formed to be thick, the thin portion is greatly deformed when bent together with the universal joint 70. Become. Then, the grease flows out from the damaged portion.
Further, if the boot 51 is composed of the thick portion of the connecting portion and the other thin portion, the deformation state of the entire boot becomes abnormal, and it is difficult to push the grease to a specific location and to interpose it on the sliding portion side. become.

Further, the boot 61 shown in FIG. 23 is made of wire in order to make the reinforcing member 62 and the plate-shaped member 63 flexible, but the reinforcing member embedded in the annular recess 55 is provided. The material 62 makes insertion difficult when inserting the insertion piece 52 into the annular recess 55 due to uneven deformation. This is because when the reinforcing member 62 and the plate-like member 63 are inserted into each other,
This is because abnormal deformation accompanies in the axial direction of the above.

Further, a reinforcing member 62 and a plate-like member 63 are provided at the joint.
However, since it is buried, the flexibility of the connecting portion is deteriorated with respect to other thick portions, so that only the other thick portions are deformed and damaged. Further, grease flows out from the damaged portion, and the sliding portion of the universal joint 70 is worn away at an early stage.

When the boot 51 is assembled to the universal joint, grease must be applied to the sliding portion of the universal joint 70 before the boot 51 is assembled.
When the fitting portion 58 is fastened to the shaft 71 via the band 57, or when the fitting portion 59 is fastened to the outer ring 72 via the band 57, the lubricating action is applied. Insufficient tightening will result in grease leakage during use.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and has as its object to facilitate the joining of the split surfaces of the split boot, to increase the joining force, and to operate the split boot. The object is to improve the inside flexibility.

It is another object of the present invention to prevent the lubricating oil from flowing out of the split boot and to allow the grease in the split boot to uniformly intervene on the sliding portion side. Another object of the present invention is to facilitate a method of injecting lubricating oil and an assembling method in assembling the split boot.

[0021]

Means for Solving the Problems The present invention has been made to solve the above-mentioned problems, and the technical means thereof are configured as follows.

According to the first aspect of the present invention, a flexible portion (9) is formed in the middle of an annular shape, and the fitting portion (4) at one end of the flexible portion (9) is one of a shaft joint. And a mounting portion (5) on the other end side fitted to the other outer ring of the shaft coupling, the first boot divided in the axial direction inserted into the shaft coupling from between divided surfaces. The inner boot (1) having the divided surfaces (2, 2) and the second divided surfaces (2) axially divided so as to be insertable into the outer peripheral surface (10) of the inner boot (1) from the divided surfaces. And an outer boot (21) having an inner peripheral surface (30) fitted to the outer peripheral surface (10) of the inner boot (1), the first of the inner boot (1). The flexible part (9a) has a lubricating oil injection hole (35) penetrating therethrough, and the second part of the outer boot (21).
The flexible portion (9b) has a sealing fitting portion (36) which is sealingly fitted to the lubricating oil injection hole (35).

According to a second aspect of the present invention, a plurality of lubricating oil injection holes (35) of the inner boot (1) are formed in the axial direction along the first divisional surfaces (2, 2), and a sealing fit is provided. The split boot according to claim 1, wherein the joint (36) is arranged corresponding to the lubricating oil injection hole (35).

According to a third aspect of the present invention, the second dividing plane (2
2, 22) and a second divided surface (22, 22)
3. The divided boot according to claim 1, wherein an inner peripheral surface of the divided portion is bonded to an outer peripheral surface of the inner boot with an adhesive. 4. .

According to a fourth aspect of the present invention, there is provided a lubricating oil injection hole (3).
4. The method according to claim 1, wherein the flexible portion has a mounting portion on the side of the mounting portion, and the sealing portion is disposed at a position corresponding to the lubricating oil injection hole. Split boots as described.

According to a fifth aspect of the present invention, an outer boot (2) is provided.
The thickness of the second flexible portion (9b) of (1) is formed to be thinner than the thickness of the first flexible portion (9a) of the inner boot (1). 2. The split boot according to item 1.

According to a sixth aspect of the present invention, an inner boot (1) is provided.
Open between the first divided surfaces (2, 2) and inserted from the side of the shaft coupling to fit the first fitting portion (4a) to the shaft (45) of the shaft coupling and perform the first mounting. The portion (5a) is fitted to the outer ring (46a) of the shaft coupling, lubricating oil is injected into the inner boot (1) from the lubricating oil injection hole (35), and then the second of the outer boot (21). The inner peripheral surface (30) is fitted to the outer peripheral surface (10) of the inner boot (1), and the sealing portion (36) is inserted into the lubricating oil injection hole (3).
5), and the fitting portion (4) in which the first fitting portion (4a) and the second fitting portion (4b) are fitted is fastened to the fastener (1).
Attach to the shaft of the shaft coupling in 4) and the first attaching portion (5
a) A mounting portion (5) in which the second mounting portion (5b) is fitted.
Is a method of assembling a split boot in which is attached to an outer ring of a shaft coupling with a fastener (14).

[0028]

Since the inner boot 1 and the outer boot 21 are fitted in two layers, the thickness of the entire circumference of both can be made substantially uniform. Therefore, the shaft joint can be uniformly deformed in accordance with the bending angle. Further, the lubricating oil in the split boot is not separated from the sliding portion of the shaft coupling because the split boot does not deform abnormally. Further, since the lubricating oil injection hole is provided in the inner boot 1, the lubricating oil can be injected from the lubricating oil injection hole 35 after the inner boot is assembled to the shaft coupling. After that, the sealing portion 36 of the outer boot 21 is
At the same time, the inner peripheral surface 30 of the outer boot 21 is fitted to the outer peripheral surface 10 of the inner boot 1. For this reason, in assembling the split boot 40, it is possible to prevent the lubricating oil from adhering to the mounting surface and causing the mounting failure.

[0029]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A split boot according to an embodiment of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a sectional view showing a split boot according to a first embodiment of the present invention attached to a shaft coupling 45.

In FIG. 1, reference numeral 40 denotes a split boot.
In the split boot 40, the outer peripheral surface 10 of the inner boot 1 and the inner peripheral surface 30 of the outer boot 21 are fitted and integrally formed, and the fitting portion 4 at one end is fitted to the shaft 45. At the same time, the mounting portion 5 at the other end is mounted on the outer ring 46 a of the shaft coupling 46. The fitting portion 4 and the mounting portion 5 are fastened by a band 14 provided in a mounting groove 15 formed on the outer peripheral side.

FIG. 2 is a sectional view of the inner boot 1.
In FIG. 2, an inner boot 1 is made of a rubber material, and a portion including first divided surfaces 2, 2 divided in an axial direction is formed in first divided portions 3, 3.

The inner boot 1 has a small-diameter first fitting portion 4a fitted to the shaft 45 of the shaft coupling 46 at one end in the axial direction.
Are formed. In addition, the other end of the outer ring 4 of the shaft coupling 46 is provided at the other end.
A first attachment portion 5a to be fitted with 6a is formed.

Further, the first fitting portion 4a and the first mounting portion 5
The middle part of the first flexible part 9a is formed by a peak part 6, a valley part 7, and an inclined part 8 connecting the both parts. The first flexible portions 9a include the first divided portions 3 and 3 including the first divided surface 2 on the first mounting portion 5a side and the first divided portions 3 and 3 on the first fitting portion 4a side. Lubricating oil injection holes 35 penetrating inside and outside are formed in the first divided portions 3 and 3 including the divided surface 2. From the lubricating oil injection hole 35 to the shaft coupling 45
The lubricating oil is injected into the sliding portion of the.

The inner boot 1 is provided with first divided surfaces 2, 2 divided in the axial direction, and a certain width including the first divided surface 2 is equal to the first divided portion 3. , 3. The first divided portions 3 are bonded to the inner peripheral surface 30 of the outer boot 21 via the adhesive 16. Note that the first divisions 3, 3 are formed by first division surfaces 2,
2 are bonded to each other with the adhesive 16 and also to the outer boot 21. This adhesive uses rubber paste of substantially the same quality as the material to be bonded. However, it is recognized that the use of other rubber adhesives is effective.

FIG. 3 shows a cross section of the outer boot 21. In FIG. 1 and FIG.
Similarly to the inner boot 1, a bellows-like second flexible portion 9b is formed, and a second fitting portion 4b and a second mounting portion 5b are provided on both sides of the flexible portion 9b. ing. And
Second fitting portion 4 of second flexible portion 9b of outer boot 21
As shown in FIG. 5, the lubricating oil injection holes 35 of the inner boot 1 are fitted to the inner peripheral surfaces 30 of the second divided portions 23 on the b side and the second mounting portion 5b side. Sealed part 3 protruding from
6 are formed. The sealing portion 36 is fitted into the lubricating oil injection hole 35 to prevent the lubricating oil in the inner boot 1 from flowing out from the lubricating oil injection hole 35 to the outside.
It serves to position the inner boot 1 and the outer boot 21 for fitting. At the same time, the bonding force between the inner boot 1 and the outer boot 21 is strengthened.

The second fitting portion 4b and the second mounting portion 5b
An annular band mounting groove 15 is formed on the outer periphery of the. The inner peripheral surface 30 of the outer boot 21 is formed to have the same diameter as the outer peripheral surface 10 of the inner boot 1 so as to adhere or adhere thereto. The fitting portion 4 is formed by fitting the second fitting portion 4b to the first fitting portion 4a.
Further, the second mounting portion 5b is fitted to the first mounting portion 5a to form the mounting portion 5.

The second divisions 23, 2 of the outer boot 21
3 is an adhesive 16 between the inner peripheral surface 10 of the boot 1
Glued through. The width of the second divided portion 23 varies depending on the size of the boot 40, but is in the range of 15 to 20 mm from the second divided surface 22 in the present embodiment.

The bonding force of the second divided portions 23, 23 due to the adhesion is excellent even at 15 to 20 mm.
This is because the ridges 6 and the valleys 7 of the inner boot 1 are fitted to the ridges 26 and the valleys 27 of the outer boot 21, thereby reinforcing the coupling force of the second divided portions 23, 23. . For this reason, both can be integrated without bonding the second divided portions 23, 23.

The outer boot 21 is also made of a rubber material having substantially the same thickness. The second division 2 of the outer boot 21
The same adhesives 16 used for the inner boot 1 are also used for the adhesives 3 and 23.

FIG. 4 is a front view of the split boot 40 excluding the shaft coupling 46 shown in FIG. In FIG. 4, as described above, the inner boot 1 has the first divided surfaces 2 and 2 joined, and the first divided portions 3 and 3 are formed on both sides of the joined first divided surface. I have.

Further, the outer boot 21 is fitted on the inner boot 1, and the split surfaces 2 and 22 thereof are 180 °
It is arranged at a phased position. Then, the second divided portions 23, 23 are bonded to the outer peripheral surface 10 of the inner boot 1 by an adhesive.
And is glued.

The circumferential deviation between the first and second divided surfaces 2 and 22 is not limited to 180 °, but may be 30 °, 45 °, 90 °.
° should just be off. However, it is most preferable that the angle is shifted by 180 °.

FIG. 5 is a sectional view taken along the line AA of FIG.
In FIG. 5, the first flexible portion 9a of the inner boot 1
As described above, the lubricating oil injection hole 35 is formed in the first divided portions 3 and 3 on the side of the mounting portion 5a. After lubricating oil is injected from the lubricating oil injection hole 35, the sealing portion 36 of the outer boot 21 is fitted into the lubricating oil injection hole 35 of the inner boot 1 as shown in FIG.

The sealing portion 36 is formed in a columnar shape, and is formed on a locking portion 36a having a mounting cone on the tip end side. The locking portion 36a serves as a stopper.
Although the cross section taken along the line BB in FIG. 4 is omitted, the configuration is the same as the shape shown in the cross section taken along the line AA.

Next, the assembly of the present invention will be described. In FIG. 1, the split boot 40 according to the present invention
Is opened between the first divided surfaces 2 and 2 and inserted into the shaft coupling 46 in a direction perpendicular to the axial direction (side). Then, the first divided surfaces 2 and 2 are bonded to each other via the adhesive 16. At this time, the first fitting portion 4a is fitted on the shaft 45, and the first fitting portion 5a is fitted on the outer ring 46a of the shaft coupling 46. Then, lubricating oil is injected into the boot 1 inside the lubricating oil injection hole 35.

Next, the second divided surface 2 of the outer boot 21
Open between 2, 22 and the outer peripheral surface 1 from the side of the inner boot 1
0 and the sealing portion 36 of the outer boot 21
Into the lubricating oil injection hole 35 of the boot 1 on the inside. Then, the inner peripheral surface 30 of the second divided portions 23, 23 is
Is adhered to the outer peripheral surface 10 of the boot 1 on the inside. At the same time, the second divided surfaces 22, 22 are also bonded to each other with an adhesive. Then, the fitting portion 4 and the mounting portion 5 are fastened with the fastener (band) 14.

FIG. 6 is a perspective view of a split boot according to a second embodiment of the present invention. FIG. 7 is a perspective view of the inner boot 1 of FIG. FIG. 8 is a perspective view of the outer boot 21 of FIG.

In FIG. 6, the split boot 40 is a perspective view in which a shaft coupling is omitted and the outer boot 21 is connected to the inner boot 1. As shown in FIG. 7, the inner boot 1 forms first divided surfaces 2, which are divided at one point in the axial direction. Then, a bellows-like first formed substantially in the same shape
At both ends of the flexible portion 9a, a first fitting portion 4a fitted to the shaft 45 and a first mounting portion 5a fitted to the outer ring 46a of the shaft coupling 46 are provided.

In the boot 1 on the inside, the thickness of the first flexible portion 9a is formed to be substantially the same. A lubricating oil injection hole 35 is formed in the first flexible portion 9a on the side of the first mounting portion 5a.
Are formed.

Next, FIG. 8 is a perspective view of the outer boot 21. In FIG. 8, the inner peripheral surface 30 of the outer boot 21 is shown.
Is formed to have substantially the same diameter as the outer peripheral surface 10 of the inner boot 1. Also, the second divided surfaces 22, 22 divided in the axial direction
Are formed. Furthermore, the second fitting portion 4b and the second fitting portion 5b that fit with the first fitting portion 4a of the inner boot 1 and the outer peripheral surface 10 of the first fitting portion 5 are formed of the second flexible portion. 9b are formed at both ends. An inner boot 1 is provided on the inner peripheral surface 30 of the second flexible portion 9b on the side of the second mounting portion 5b.
A sealing portion 36 that fits into the lubricating oil injection hole 35 is formed in a columnar shape.

The inner boot 1 and the outer boot 21 formed as described above are connected as shown in FIG. That is, the outer race 46a of the shaft coupling 46 (not shown) and the shaft 4
First, the first split surfaces 2 and 2 of the boot 1 inside the side with the side 5 are opened and inserted, and the first mounting portion 5a is
6a. At the same time, the first fitting portion 4a also fits on the shaft 45.

Next, the first divided surfaces 2 and 2 are bonded to each other with an adhesive 16 therebetween. Then, the lubricating oil is injected into the inner boot 1 from the lubricating oil injection hole 35.

When the mounting of the inner boot 1 is completed, the second divided surfaces 22 of the outer boot 21 are opened from each other and fitted to the outer peripheral surface 10 of the inner boot 1 from the side. At this time, the sealing portion 36 of the outer boot 21 is fitted into the lubricating oil injection hole 35 of the inner boot 1 to prevent the lubricating oil in the inner boot 1 from flowing out.

Before fitting the outer boot 21 to the inner boot 1, the adhesive 1 is applied to the outer peripheral surface 10 of the inner boot 1.
6 is applied, and the outer peripheral surface 10 of the inner boot 1 and the inner peripheral surface 30 of the outer boot 21 are bonded via the adhesive 16.

FIG. 9 is a sectional view taken along the line CC shown in FIG. In FIG. 9, the sealing portion 36 provided on the inner peripheral surface 30 of the outer boot 21 protrudes in a cylindrical shape. Then, it is fitted into the lubricating oil injection hole 35 formed in the inner boot 1. The sealing portion 36 seals the lubricating oil injection hole 35 and can position the inner and outer boots 1 and 21 at the time of bonding. Furthermore, both boots 1, 21
Can be prevented from peeling during operation.

FIG. 10 is a sectional view taken along the line DD shown in FIG. In FIG. 10, the lubricating oil injection hole 35 is preferably formed as a circular through hole. This is because they are excellent in workability and fit.

FIG. 11 is a sectional view taken along the line EE in FIG. In FIG. 11, the sealing portion 36 protrudes from the inner peripheral surface 30 of the outer boot 21 in a cylindrical shape. This sealing part 36
The protruding length of the cylindrical portion is the same as the depth of the lubricating oil injection hole 35, and a conical locking portion 36a is formed at the tip of the cylindrical portion. Further, the fitting surface of the sealing portion 36 may be bonded with the adhesive 16.

FIG. 12 shows another embodiment of the sealing portion 36. In FIG. 12, the length of the sealing portion 36 is substantially the same as the depth of the lubricating oil injection hole 35. However, a groove 36b is formed at the tip end instead of the locking portion 36a. With this groove 36b, the outflow of the lubricating oil from the lubricating oil injection hole 35 can be reliably sealed at the tip end.

FIG. 13 is a sectional view of a split boot 40 according to a third embodiment of the present invention. FIG. 14 shows FIG.
It is a front view of No. 3. FIG. 15 is a sectional view taken along the line AA of FIG. FIG. 16 is a side view of the inside boot 1 of FIG. FIG. 17 is a front view of FIG. FIG. 18 is a side view of the outer boot.

In FIG. 13, the split boot 40 is assembled without the shaft coupling 46.

The inner boot 1 shown in FIG. 13 is formed in the shape shown in FIG. In FIG. 16, the inner boot 1 is provided with a bellows-shaped first flexible portion 9a in which a peak portion 6 is formed in five lines, and a first fitting portion 4a and a first fitting portion 4a on both sides. One attachment portion 5a is formed. In addition, first divided surfaces 2, 2 divided in the axial direction are provided. Furthermore,
A portion having a width of 10 to 20 mm including the first divided surfaces 2 and 2 is configured as the first divided portions 3 and 3. In addition, trough 7
The recess 19, which is the outer periphery of, is formed to have a larger cross-sectional radius than the peak 6 so that the outer boot 21 can be easily fitted.

The material of the inner boot 1 is made of rubber material, but may be made of resin material. The first divided portions 3 are provided with two rows of lubricating oil injection holes 3 along the axial direction.
5 are formed. FIG. 17 is a front view of the inside boot 1 of FIG. The first of this inner boot 1
Are opened so that the split surfaces 2 can be opened and inserted into the shaft coupling 46 from the side.

FIG. 18 is a side view of the outer boot 21. The shape of the outer boot 21 is formed so as to be able to closely fit the outer diameter of the inner boot 1 in FIG. The material of the outer boot 21 is a resin material. However, it is also possible to use a rubber material. A sealing member 36 made of a rubber material is attached to the attachment hole 13 provided at a position corresponding to the lubricating oil injection hole 35 of the inner boot 1.

The inner boot 1 and the outer boot 21 configured as described above are assembled to the shaft joint 46 from the side of the shaft joint 46 by opening the first divided surfaces 2 and 2 of the inner boot 1. wear. Then, the first fitting portion 4a is fitted to the shaft 45, and the first mounting portion 5a is fitted to the outer ring 46a of the shaft coupling 46. Then, the lubricating oil is injected into the boot 1 inside through the lubricating oil injection hole 35.

Next, the second divided surface 2 of the outer boot 21
2 and 22, the inner peripheral surface 30 of the outer boot 21 is fitted to the outer peripheral surface 10 of the boot 1 inside the side. At this time, the sealing portion 36 provided on the outer boot 21 is fitted tightly into the lubricating oil injection hole 35. Then, the adhesive 16 is applied to the inner peripheral surface 30 and the second divided surfaces 22, 22 of the second divided portions 23, 23 of the outer boot 21 and adhered to the outer peripheral surface 10 of the inner boot 1.

FIG. 13 is a side view showing a state in which the inner and outer boots 1 and 21 are assembled. At the stage when the outer boot 21 is completely bonded, the lubricating oil may be uniformly injected into the inner boot 1 through the mounting hole 13 and the lubricating oil injection hole 35 by removing the sealing portion 36. Then, the sealing portion 36 is fitted into the lubricating oil injection hole 35. Since a large number of the lubricating oil injection holes 35 are provided, the lubricating oil can be uniformly supplied to the sliding surface of the shaft coupling 46. Further, the sealing portion 36 can be made of a resin material other than the rubber material, and can be screwed into the lubricating oil injection hole 35 like a bolt at the tip end.

The split boot 40 of the third embodiment
The first divided surfaces 2 and 2 of the inner boot 1 are
As a result, the second divided portions 23, 23 of the outer boot 21 are adhered to the inner boot 1 by the adhesive 16, so that they are firmly connected. At the same time, the oil-resistant inner boot 1 and the durable outer boot 21 can be made of different materials, so that the oil resistance and the durability can be improved. Further, since the inner and outer boots 1 and 21 can be formed to be thin, flexibility corresponding to the movement of the shaft coupling 46 can be exhibited. When the lubricating oil of the split boot 40 is insufficient, the lubricating oil is removed from the sealing portion 36 and removed.
Lubricating oil can be injected from

FIG. 19 is a partial sectional view of a split boot showing a fourth embodiment of the present invention.

In FIG. 19, the overall structure is substantially the same as the split boot shown in FIG. The difference is that the thickness of the outer boot 21 is configured to be thinner than the thickness of the inner boot 1 to facilitate the mounting of the outer boot 21. Also, a breather-type sealing portion 36 is provided in the lubricating oil injection hole 35.
Is fitted. A hole 36d having a conical tip is formed in the sealing portion 36, and a slit 36c is formed at the tip of the hole 36d to communicate with the inside of the split boot 40. Since the slit 36c is elastically tightened from the outer peripheral side by the lubricating oil injection hole 35, it cannot be easily opened. When the lubricating oil in the split boot 40 is insufficient, the lubricating oil can be injected by inserting an injector into the slit 36c.

As is clear from the above-described first to fourth embodiments of the present invention, various other forms of the sealing portion 36 are conceivable. For example, one in which the sealing portion 36 is made of a different material from the outer boot 21 and one end thereof is adhered to the inner periphery of the outer boot 21 with an adhesive. Alternatively, ten slits are provided in the locking part 36a of the sealing part 36 shown in FIG. 11 to facilitate insertion. Further, in the present invention, a screw is provided at the tip of the sealing portion 36 in FIG. 15, and the sealing portion 36 is screwed into the lubricating oil injection hole 35 to tighten the inner and outer boots 1 and 21 to seal. Belong to.

In the case where the flexible portion 9 is formed in a bellows shape, when the inner boot 1 and the outer boot 21 are fitted to each other, the bellows of the bellows are connected to each other. Therefore, the inner boot 1 and the outer boot 21 can be joined without being bonded by an adhesive. Therefore, in the above-described embodiment, the embodiment in which both are bonded via the adhesive 16 has been described. However, the entire bonding surface of both may be bonded with the adhesive 16, or the adhesive may be used. Instead, they can be integrally formed with the split boot 40 by closely fitting the two.

[0073]

Since the split boot of the present invention has a laminated structure, the connecting portion including the split surface can be formed in a thin structure.
The effect of exhibiting flexibility corresponding to the movement of the shaft coupling can be expected. In addition, since the lubricating oil is supplied into the split boot from the lubricating oil injection hole after the inner boot is assembled to the shaft coupling, the lubricating oil may deteriorate the mounting work of the split boot or cause improper mounting. Thus, leakage of lubricating oil during operation can be prevented. Further, the supply of the lubricating oil into the split boot is extremely easy. Further, since the split boot has a laminated structure and is excellent in flexibility and is not abnormally deformed during operation, it is possible to effectively prevent a problem that lubricating oil is not supplied to the sliding surface of the shaft coupling. At the same time, abnormal deformation can be prevented, so that damage to the split boot can also be effectively prevented.

According to the second aspect of the present invention, since the lubricating oil injection hole is provided on the dividing surface side, it is possible to effectively prevent the lubricating oil from flowing out of the dividing surface when injecting. at the same time,
Since the lubricating oil injection hole is formed along the axial direction of the split surface, it is possible to uniformly inject the lubricant into the split boot. Further, by fitting the sealing portion into the lubricating oil injection hole, the split surface of the inner boot can be strongly prevented from opening, and the leakage of the lubricating oil can be effectively prevented,
It becomes possible to strongly hold the connection of the outer boot.

According to the third aspect of the present invention, the inner peripheral surface of the divided portion having a certain width from the space between the divided surfaces of the outer boots is bonded to the outer peripheral surface of the inner boot with an adhesive. Since it only has to be applied to the divided portion, it is possible to effectively prevent the adhesive from adhering to the other surface and causing a problem, and at the same time,
Handling for applying the adhesive becomes extremely easy.

According to the fourth aspect of the present invention, since the injection hole for lubricating oil is provided in the flexible portion on the mounting portion close to the sliding surface of the shaft joint of the split boot, the sliding surface of the shaft joint is directly provided. It is possible to inject lubricating oil into the oil. Therefore, injection of lubricating oil is extremely effective.

According to the fifth aspect of the present invention, since the outer boot is formed to be thinner than the inner boot, it is extremely easy to fit the outer boot to the inner boot. In addition, an effect can be expected in which the outer boot makes close contact with the inner boot without using an adhesive.

According to a sixth aspect of the present invention, in the configuration in which at least two layers of inner and outer boots are fitted to each other, the lubricating oil is injected from the lubricating oil injection hole at the stage when the inner boot is attached to the shaft coupling. When the outer boot is fitted to the inner boot at the same time, the sealing portion is also fitted to the lubricating oil injection hole, so that the supply of the lubricating oil is performed effectively during the assembly. be able to. Further, the assembling work of the split boots can be efficiently performed.

[Brief description of the drawings]

FIG. 1 is a sectional view of a split boot according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of the inner boot of FIG.

FIG. 3 is a sectional view of the outer boot of FIG. 1;

FIG. 4 is a front view of the split boot of FIG. 1;

FIG. 5 is a sectional view taken along the line AA of FIG. 4;

FIG. 6 is a perspective view of a split boot according to a second embodiment of the present invention.

FIG. 7 is a perspective view of the inner boot of FIG. 6;

FIG. 8 is a perspective view of the outer boot of FIG. 6;

FIG. 9 is a sectional view taken along the line CC of FIG. 6;

FIG. 10 is a sectional view taken along the line DD in FIG. 7;

11 is a sectional view taken along the line EE in FIG. 8;

FIG. 12 is a sectional view of another embodiment of FIG. 8;

FIG. 13 is a side view of a split boot according to the third embodiment of the present invention.

FIG. 14 is a front view of FIG.

FIG. 15 is a sectional view taken along the line AA of FIG. 13;

FIG. 16 is a side view of the inner boot of FIG. 13;

FIG. 17 is a front view of the inside boot of FIG. 16;

FIG. 18 is a side view of the outer boot of FIG.

FIG. 19 is a sectional view of a main part of a split boot according to a fourth embodiment of the present invention.

FIG. 20 is a perspective view of a conventional split boot.

FIG. 21 is a cross-sectional view of a coupling portion of the split boot of FIG. 20;

FIG. 22 is a sectional view of another split boot according to the conventional example.

FIG. 23 is a cross-sectional view of a joint portion of still another split boot of the conventional example.

[Explanation of symbols]

 1 ··· Inside boot 2 ··· First split surface 3 ··· First split portion 4 ··· Fitting portion 4a ··· First fitting portion 4b ··· Second fitting portion 5 ··· Mounting portion 5a ··· First mounting portion 5b ···· Second mounting portion 6 ··· Crest portion 7 ··· Valley portion 8 ···· Inclined part 9 Flexible part 9a First flexible part 9b Second flexible part 10 Outer peripheral surface 13 Mounting hole 14 Fastener 15 ... Mounting groove 16 ... Adhesive 19 ... Concave part 21 ... Outside boot 22 ... Second division surface 23 ... Second division part 26 ... Crest part 27・ ・ Valley part 28 ・ ・ ・ Slope part 30 ・ ・ ・ Inner peripheral surface 35 ・ ・ ・ Injection hole for lubricating oil 36 ・ ・ ・ Sealing part 36a ・ ・ Locking part 36b ・ ・ Groove 36c ・ ・ Slit 36d ・ ・ Hole 40: Split boot 45: Shaft 4 ... Shaft coupling 46a ... Outer ring 51 ... Boot 52 ... Insertion piece 53 ... Locking step 54 ... Slope surface 55 ... Circular recess 56 ... Extension piece 57 ··· Band 58 ··· Fitting part 59 ··· Mounting part 61 ··· Boot 70 ··· Universal joint 71 ··· Shaft 72 ··· Outer ring

Claims (6)

[Claims] A flexible portion (9) is formed in the middle of an annular shape, and a fitting portion (4) at one end of the flexible portion (9) is fitted to one shaft of a shaft coupling. And a mounting portion (5) on the other end side is a split boot that is fitted to the other outer ring of the shaft coupling, and is a first split surface (first split surface) that is axially split and inserted into the shaft coupling from between the split surfaces. An inner boot (1) having 2, 2) and an outer peripheral surface (10) of the inner boot (1).
An inner peripheral surface (30) having a second divided surface (22, 22) divided in the axial direction so as to be insertable from between the divided surfaces and fitted to the outer peripheral surface (10) of the inner boot (1). An outer boot (21) having a lubricating oil injection hole (35) penetrating the first flexible portion (9a) of the inner boot (1); The lubricating oil injection hole (35) is provided in the second flexible portion (9b) of (21).
A split boot having a sealing portion (36) hermetically fitted to the boot. 2. A plurality of the lubricating oil injection holes (35) are formed in the axial direction along the first divided surface (2, 2), and the sealing portion (36) is formed by the lubricating oil injection holes. (3
The split boot according to claim 1, wherein the split boot is arranged corresponding to (5). 3. A second divided portion (23, 23) provided with a second divided surface (22, 22) of the outer boot (21) and the second divided surface (22, 22). 3. The split boot according to claim 1, wherein an outer peripheral surface of the inner boot is bonded to an outer peripheral surface of the inner boot with an adhesive. 4. 4. The lubricating oil injection hole (35) is provided on the mounting portion (5a) side of the flexible portion (9a), and the sealing portion (36) is also provided in the lubricating oil injection hole (35). The split boot according to claim 1, wherein the split boots are arranged at corresponding positions. 5. The thickness of the second flexible portion (9b) of the outer boot (21) is greater than the thickness of the first flexible portion (9a) of the inner boot (1). The split boot according to claim 1, wherein the split boot is formed to be thin. 6. The inner boot (1) is opened from the side of the shaft coupling while opening between the first division surfaces (2, 2) of the inner boot (1), and the first fitting portion (4a) is inserted into the shaft coupling. Fitting the first mounting portion (5a) to the outer ring of the shaft coupling while injecting the lubricating oil into the inner boot (1) from the lubricating oil injection hole (35); Next, the second divided surface (22, 22) of the outer boot (21) is opened to open the inner peripheral surface (3).
0) is fitted to the outer peripheral surface (10) of the inner boot (1), and the sealing portion (36) is hermetically fitted to the lubricating oil injection hole (35), and the first fitting is performed. Part (4a)
The fitting portion (4) in which the first fitting portion (5a) and the second fitting portion (4b) are fitted to each other is attached to the shaft of the shaft joint with the fastener (14). A method for assembling a split boot, comprising: attaching a mounting portion (5) fitted with a mounting portion (5b) to an outer ring of a shaft coupling with a fastener (14).