JPH0614558U - Seal cover for fittings - Google Patents

Abstract

(57) [Abstract] [Purpose] In a seal cover for a joint for sealing a universal joint having an outer ring and an inner ring, deterioration of the sealing performance can be prevented even if the seal member is worn, and the durability is high. To provide a seal cover for fittings. [Structure] An inner spherical shell 14 fixed to the input shaft 13 on the inner ring side, an outer spherical shell 15 covering the outer ring 12, and first and second inner peripheral surface end portions on both sides of the outer spherical shell 15. The first sealing device 16 including the sealing devices 16 and 17.
Includes a seal member 20 inside the retainer 18 in which the lip portion 20a at the tip contacts the inner spherical shell 14, and a coil spring 21 for pressing the seal member 20 toward the large diameter side of the inner spherical shell 14.
Similarly, the second sealing device 17 includes a seal member 24 inside the retainer 22 in which the lip portion 24 a at the tip of the outer ring 12 contacts, and a coil spring 25 that presses the seal member 24 toward the large diameter side of the outer ring 12. . A single spherical shell may be used instead of the spherical shells 14 and 15.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a joint seal cover for sealing a universal joint having an outer ring and an inner ring used in automobiles and various industrial machines.

[0002]

[Prior art]

 It has been proposed to use a spherical shell made of a non-flexible material as a seal cover for this type of joint. FIG. 3 shows an example of a conventional seal cover for a joint using such a spherical shell. This joint seal cover 1 covers a universal joint composed of an outer ring 2 and an inner ring that is held inside the outer ring 2 so as to be bendable, and is a funnel-shaped spherical surface fixed to an input shaft 3 connected to the inner ring. The shell 4 is provided with a sliding member 5 and a sealing member 6 which are fixed to the inside of the open end of the spherical shell 4 and come into contact with the outer peripheral surface of the outer ring 2. The rotational force applied to the input shaft 3 is transmitted to the output shaft 7 connected to the outer ring 2, and even if the input shaft 3 is angled, the rotational force can be correctly transmitted by the connection between the outer ring 2 and the inner ring. It is like this. Lubricating oil such as grease is filled inside the spherical shell 4 to lubricate the joint between the outer ring 2 and the inner ring, and the sealing member 6 leaks this lubricating oil to the outside and dust from the outside. To prevent intrusion.

[0003]

[Problems to be solved by the device]

 However, the conventional seal cover for a joint has a problem that when the seal member 6 is worn, a gap is generated between the seal member 6 and the outer peripheral surface of the outer ring 2 to deteriorate the sealing performance. Further, since the seal member 6 is made of a flexible material, there is a problem in durability such as abrasion resistance and strength.

Therefore, an object of the present invention is to provide a highly durable seal cover for a joint, in which the sealing performance does not deteriorate even if the seal member is worn.

[0005]

A joint seal cover according to the present invention includes a spherical shell fixed to an inner ring side to cover an outer ring, and a spherical shell provided on the spherical shell or the outer ring to seal between the spherical shell and the outer ring. A seal member and spring means for axially pressing the seal member to increase the pressure contact force with respect to the spherical shell or the outer ring are provided. In addition, at least the lip portion that comes into contact with the spherical shell or the outer ring of the seal member has high wear resistance.

[0006]

[Action]

 Therefore, according to the present invention, even if the seal member provided between the spherical shell and the outer ring is worn, this seal member is always pressed against the spherical shell or the outer ring by the spring means, so There is no gap between the shell and the outer ring, and the sealing performance does not deteriorate. Further, since at least the lip portion of the seal member that comes into contact with the spherical shell or the outer ring is made highly wear resistant, the durability of the seal member can be enhanced.

[0007]

【Example】

 FIG. 1 shows a first embodiment of the present invention. FIG. 1 (a) shows the overall structure of the joint seal cover. The joint seal cover 11 is for sealing the joint between the outer ring 12 and the inner ring that is held inside the outer ring 12 so as to be bendable, and is fixed to the input shaft 13 that is joined to the inner ring, A funnel-shaped inner spherical shell 14 having an inner diameter slightly larger than the outer diameter of 12, a cylindrical outer surface shell 15 that covers the outer peripheral surface of the inner spherical shell 14 and the outer peripheral surface of the outer ring 12, and the outer spherical shell 15 , And first and second sealing devices 16 and 17 respectively provided at both ends of the inner peripheral surface of the. As shown in FIG. 1B, the first sealing device 16 includes a retainer 18, which is fixed to one end of the inner peripheral surface of the outer spherical shell 15 and has a substantially U-shaped cross section and is formed in a ring shape. A seal member 20 arranged inside the retainer 18 via an O-ring 19, and a coil spring 21 for axially pressing the seal member 20 toward the large diameter side of the outer peripheral surface of the inner spherical shell 14. It is equipped with. The lip portion 20a that contacts the inner spherical shell 14 of the seal member 20 should be formed in a wedge-shaped cross-section with a large outside angle and a small inside angle with respect to the contact surface, and dust and the like from the outside may enter. Good for preventing Similarly, in the second sealing device 17, as shown in FIG. 1C, a retainer 22 formed in a ring shape with a substantially U-shaped cross section is fixed to the other end of the inner peripheral surface of the outer spherical shell 15. A seal member 24 is provided inside the retainer 22 via an O-ring 23, and a coil spring 25 that axially presses the seal member 24 toward the large diameter side of the outer peripheral surface of the outer ring 12. The lip portion 24a that contacts the outer ring 12 of the seal member 24 is also designed to have a wedge-shaped cross section with a large outside angle and a small inside angle with respect to the contact surface. Good for preventing intrusion. Each of the sealing members 20 and 24 is made of a material such as carbon resin, synthetic resin, rubber or the like having high wear resistance and high strength, heat resistance and impact resistance, but at least only the lip portions 20a and 24a thereof are made of this material. It may be formed of such a material, attached, or coated. Further, as the coil springs 21 and 25, other spring means such as a disc spring may be used.

Next, the operation of the above embodiment will be described. When the angle of the input shaft 13 with respect to the outer ring 12 is changed while rotating, the inner spherical shell 14 fixed to the input shaft 13 also changes the angle following this movement, and the sealing member 20 of the first sealing device 16 is changed. The lip portion 20a slides on the outer peripheral surface of the inner spherical shell 14. Further, since the lip portion 24a of the seal member 24 of the second seal device 17 also slides on the outer peripheral surface of the outer ring 12, it is possible to prevent the lubricating oil filled in the seal cover 11 for the joint from flowing out. can do. When the spherical shell is doubled in this way, the interference on the open end side of the spherical shell can be ignored, so that there is an advantage that the working angle of the input shaft 13 can be made larger than that in the case of a single spherical shell. Even if the lip portions 20a 1 and 24a 2 of the seal members 20 and 24 wear due to long-term use, the seal member 20 is pressed by the coil spring 21 toward the large diameter side of the inner spherical shell 14, and the seal member 24 is rotated. Since the outer ring 12 is pressed against the large diameter side by 25, the tightening margins for the inner spherical shell 14 and the outer ring 12 can be secured, respectively, and the deterioration of the sealing performance can be prevented.

FIG. 2 shows a second embodiment of the present invention, in which the mating members to which the first and second sealing devices are attached are different from the first embodiment. In FIG. 2 (a), the joint seal cover 31 seals the joint between the outer ring 32 and the inner ring which is held inside the outer ring 32 so as to be bendable, and is attached to the input shaft 33 connected to the inner ring. Input of the fixed funnel-shaped outer spherical shell 34, a cylindrical inner spherical shell 35 fitted to the inner peripheral surface of the outer spherical shell 34 to cover the outer peripheral surface of the outer ring 32, and the inner spherical shell 35. A first sealing device 36 provided on the outer peripheral surface end portion on the shaft 33 side and a second sealing device 37 provided on the outer peripheral surface end portion on the input shaft 33 side of the outer ring 32 are provided. As shown in FIG. 2 (b), the first seal device 36 includes a retainer 38 fixed to the outer peripheral surface end of the inner spherical shell 35 and formed in a ring shape with a substantially U-shaped cross section, and the retainer 38. And a coil spring 41 for axially pressing the seal member 40 toward the smaller diameter side of the inner peripheral surface of the outer spherical shell 34. is there. The lip portion 40a that contacts the outer spherical shell 34 of the seal member 40 is formed in a wedge-shaped cross section with a large outer angle and a small inner angle with respect to the contact surface to prevent dust and the like from entering from the outside. Is preferable. Similarly, as shown in FIG. 2 (c), the second sealing device 37 also has a retainer 42 formed in a ring shape with a substantially U-shaped cross section, which is fixed to the outer peripheral surface end of the outer ring 32. The seal member 44 is disposed on the inner side through the O-ring 43, and the coil spring 45 that axially presses the seal member 44 toward the smaller diameter side of the inner peripheral surface of the inner spherical shell 35. is there. The lip portion 44a that contacts the inner spherical shell 35 of the seal member 44 also has a wedge-shaped cross section in which the outside angle is large and the inside angle is small with respect to the contact surface to prevent dust and the like from entering from the outside. Is preferable. Each seal member 40, 44 is made of a material such as carbon resin, synthetic resin, rubber or the like having high wear resistance and high strength, heat resistance and impact resistance, but at least only the lip portions 40a, 44a are It may be formed of such a material, attached, or coated. Further, the coil springs 41 and 45 may use other spring means such as a disc spring.

Next, the operation of the above embodiment will be described. When the angle with respect to the outer ring 32 is changed while the input shaft 33 rotates, the outer spherical shell 34 fixed to the input shaft 33 also changes the angle following this movement, and the sealing member 40 of the first sealing device 36 The lip portion 40a slides on the inner peripheral surface of the outer spherical shell 34. Further, since the lip portion 44a of the seal member 44 of the second sealing device 37 also slides on the inner peripheral surface of the inner spherical shell 35, the lubricating oil filled in the joint seal cover 31 flows out. Can be prevented. Even if the lip portions 40a, 44a of the seal members 40, 44 wear due to long-term use, the seal member 40 is pressed against the small diameter side of the outer spherical shell 34 by the coil spring 41, and the seal member 44 is Since the coil spring 45 presses the inner spherical shell 35 toward the smaller diameter side, it is possible to secure a tight margin for the outer spherical shell 34 and the inner spherical shell 35, respectively, and prevent deterioration of the sealing performance.

Although each of the above-described embodiments has been described by taking a seal cover for a joint having a double spherical shell as an example, the present invention provides a seal cover for a joint using a single spherical shell. The same can be applied to the same, and the same effect can be obtained. Alternatively, the seal device may be directly attached by providing a groove in the spherical shell or the outer ring without providing a retainer.

[0012]

[Effect of device]

 As is apparent from the above-described embodiments, the present invention provides a spherical shell fixed to the inner ring side to cover the outer ring, and a seal member provided on the spherical shell or the outer ring to seal between the spherical shell and the outer ring. And a spring means that presses the seal member in the axial direction to increase the contact force against the spherical shell or the outer ring, and even if the seal member wears, the seal member always uses the spring means to form the spherical surface. Since it is pressed against the shell or outer ring, a proper tightening margin can always be obtained and deterioration of the sealing performance can be prevented. Further, since at least the lip portion that comes into contact with the spherical shell or the outer ring of the seal member has high wear resistance, the durability of the seal member can be enhanced.

[Brief description of drawings]

FIG. 1A is an assembled partial sectional view of a seal cover for a joint and a universal joint showing a first embodiment of the present invention. (B) Partial sectional view of the first sealing device in the first embodiment of the present invention. (C) Partial sectional view of the second sealing device in the first embodiment of the present invention.

FIG. 2 (a) is an assembled partial sectional view of a seal cover for a joint and a universal joint showing a second embodiment of the present invention. (B) Partial sectional view of the first sealing device in the second embodiment of the present invention. (C) Partial sectional view of the second sealing device in the second embodiment of the present invention.

FIG. 3 is an assembled partial sectional view of a conventional seal cover for a joint and a universal joint.

[Explanation of symbols]

 11,31 Joint seal cover 12,32 Outer ring 13,33 Input shaft 14,35 Inner spherical shell 15,34 Outer spherical shell 16,36 First sealing device 17,37 Second sealing device 18,22,38, 42 retainer 19,23,39,43 O-ring 20,24,40,44 Seal member 20a, 24a, 40a, 44a Lip part 21,25,41,45 Coil spring

Claims (2)

[Scope of utility model registration request] 1. A seal cover for a joint covering a universal joint having an outer ring and an inner ring, the spherical shell being fixed to the inner ring side and covering the outer ring, and the spherical shell provided on the spherical shell or the outer ring. And a seal member for sealing between the outer ring and the outer ring,
A seal cover for a joint, comprising: spring means for axially pressing the seal member to increase a pressure contact force with respect to the spherical shell or the outer ring. 2. The seal cover for a joint according to claim 1, wherein at least a lip portion of the seal member which comes into contact with the spherical shell or the outer ring has high wear resistance.