JPH09329246A - Oil seal mounting structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve reliability of holding of the slip-off protection member of an oil seal. SOLUTION: An oil seal 10 is press fitted into the oil seal containing part 6 of the bearing part 2 of an oil pump cover 1. A slip-off protection ring 20 is arranged such that the annular part 21 thereof is brought into contact with the tip surface of a bearing part 2. A plurality of mounting pieces 22 are formed on the outer peripheral edge of the annular part 21 and bent approximately at right angles in a direction extending along the outer peripheral wall 7 of the oil seal containing part 6. A pin 30 for fixing is driven through the hole 23 for a pin of the mounting piece 22 in the pin hole 8 of the outer peripheral wall. This constitution reliably holds an oil pump cover 1 by the slip-off protection ring 20.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary shaft oil seal mounting structure for an automatic transmission or the like.

[0002]

2. Description of the Related Art In many mechanisms, such as an automatic transmission, having a rotary element, an oil seal is attached to its rotary shaft. For example, Hydra-m installed in a general motor car
An oil seal 101 is attached to the end of the oil pump cover of the atic4L60E type automatic transmission as shown in FIG. 10 in order to prevent leakage of pressure oil generated in the oil pump. This oil seal is press-fitted and attached to the shaft hole 109 of the oil pump cover 100, and a retaining ring 102 having an annular portion 103 is provided on the end surface of the shaft hole as a retaining member.

An inwardly directed projection 104 is provided on the inner edge of the annular portion 103 of the retaining ring 102. The retaining ring 102 includes a plurality of bent pieces 105 extending from the annular portion 103 along the outer wall of the end portion of the oil pump cover.
Is provided, and a claw 106 that is cut and raised inward is formed at an intermediate portion of each bent piece 105. The tip of the claw 106 faces the direction of the annular portion 103, and the inner diameter formed at the tip has an oil pump cover 1 at the mounting position.
00 is set smaller than the diameter of the outer wall. By pushing the retaining ring 102 into the end portion of the oil pump cover and externally inserting the retaining ring 102, the claw 106 is engaged with the outer wall of the cover end portion in a wedge shape. The protrusion 104 is the oil seal 10.
1 projects inward from the inner wall of the shaft hole 109 into which the oil is press-fitted, so that the oil seal is prevented from coming off.

[0004]

However, in such a conventional oil seal mounting structure, the retaining ring is held at the end of the oil pump cover by the friction and wedge effect of the claw formed on the bent piece. However, on the other hand, when a large pressure is generated by the oil pump, the oil seal cannot be reliably prevented from coming off, and the reliability is poor. On the other hand, there is also a problem that the outer wall of the end portion of the oil pump cover is scraped off with a claw at the time of pushing in at the time of mounting to generate metal debris that easily gets mixed inside the rotating mechanism.
Therefore, in view of the conventional problems described above, it is an object of the present invention to provide an oil seal mounting structure having a highly reliable retaining structure that does not generate metal scraps or the like when the retaining member is mounted. .

[0005]

Therefore, the present invention according to claim 1 is an oil seal mounting structure in a bearing portion of a rotary shaft, in which the oil seal is press-fitted and mounted from an end face opening of the oil seal accommodating portion. , A retaining ring having an annular portion engageable with the end surface of the oil seal is provided with the annular portion facing the end surface of the oil seal accommodating portion, and a plurality of holes provided on the outer peripheral edge of the annular portion. The attachment piece is formed, and the fastening member is engaged with the engagement hole formed in the bearing portion through the hole of the attachment piece, and the retaining ring is held by the bearing portion.

The engagement hole may be formed in the outer peripheral wall of the oil seal accommodating portion, and the mounting piece may be bent in the outer peripheral wall of the oil seal accommodating portion in the same direction. Alternatively, the engagement hole is formed in a rib formed on the outer wall of the oil seal accommodating portion, and the attachment piece is a base portion bent toward the top side of the rib in such a direction, and extends from the base portion to sandwich the rib. And with a side piece that holds both side walls,
The hole may be formed in the side piece.

The fastening member may be a fixing pin and the engagement hole may be a pin hole, or the fastening member may be a male screw member and the engagement hole may be a screw hole. Furthermore, the fastening member may be a rivet.

According to a fourth aspect of the present invention, an oil seal having a metal inner ring is press-fitted into the oil seal accommodating portion, a through hole is formed in the inner ring of the oil seal, and the fastening member is the oil seal. The oil seal is prevented from coming off by engaging with the engaging hole formed in the housing portion and the through hole of the inner ring. Again, the fastening member may be a fixing pin and the engagement hole may be a pin hole, or
The fastening member may be a male screw member and the engagement hole may be a screw hole.

Further, according to the invention of claim 8, an oil seal having a metal inner ring is press-fitted and mounted in an oil seal accommodating portion, and a rear end of the inner ring is locked outward in the radial direction. A piece is formed, and a ring-shaped groove is formed at the rear end of the oil seal accommodating portion, and the locking piece is engaged with the ring-shaped groove to prevent the oil seal from coming off.

[0010]

According to the first aspect of the present invention, the retaining ring is securely held on the bearing portion by penetrating the hole of the attachment piece of the retaining ring and engaging the fastening member with the engaging hole of the bearing portion. It When the oil seal is displaced in the removing direction, the annular portion of the retaining ring comes into contact with and blocks it.

By forming the engagement hole in the outer peripheral wall of the oil seal accommodating portion or in the rib of the outer wall, the retaining ring can be easily fixed outside the oil seal accommodating portion.

In the invention of claim 4, the fastening member penetrates from the engagement hole formed in the oil seal accommodating portion to the through hole formed in the metal inner ring of the oil seal, and the oil seal accommodating portion and the oil seal. Are integrated and the oil seal is prevented from coming off.

According to the eighth aspect of the invention, the engagement piece formed at the rear end of the metal inner ring engages with the ring-shaped groove of the oil seal accommodating portion to prevent the oil seal from coming off.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to examples. 1 to 3 show a first embodiment applied to an end portion of an oil pump cover. 1 is a front view, FIG. 2 is an enlarged cross-sectional view of a portion AA of FIG. 1, and FIG.
It is a figure which shows the arrow B in. Oil pump cover 1
An oil seal 10 is attached to the bearing portion 2 at a tip end opposite to the oil pump 5 chamber with a bearing 4 supporting the rotating shaft 3 interposed therebetween. The oil seal 10 has a cross section L
The inner ring 11 made of a V-shaped metal is covered with a packing 12 made of a rubber material, and a lip portion 13 that surrounds the rotating shaft 3 of the packing 12 and slides is backed up by an annular spring 15.

An oil seal accommodating portion 6 is formed at the tip of the bearing portion 2 of the oil pump cover 1, and the outer periphery of the oil seal 10 covered with the packing 12 is inside the cylindrical inner wall surface of the oil seal accommodating portion 6. It is press-fitted and installed. End surface 16 of the oil seal 10 excluding the lip portion 13
Is substantially flush with the tip surface of the oil pump cover 1. A retaining ring 20 having an annular portion 21 is provided by bringing the annular portion 21 into contact with the tip surface of the oil pump cover 1. A plurality of mounting pieces 22 are formed on the outer peripheral edge of the annular portion 21 at substantially equal intervals on the circumference, and each mounting piece 22 is attached to the outer peripheral wall 7 of the oil seal accommodating portion 6 of the tip end of the oil pump cover 1 in such a direction. It is bent at a right angle.

A pin hole 23 is formed in the mounting piece 22,
Oil pump cover 1 corresponding to the pin hole 23 of the mounting piece
A pin hole 8 is formed in the outer peripheral wall 7 at the tip of the. The pin hole 8 has a depth that does not penetrate the outer peripheral wall 7. Then, the fixing pin 3 is penetrated through the pin hole 23 of the mounting piece 22.
0 is driven into the pin hole 8 on the outer peripheral wall.

The inner diameter of the annular portion 21 is larger than the inner diameter of the lip of the oil seal 10, but is set sufficiently smaller than the diameter of the inner wall of the cylinder of the oil seal accommodating portion 6. Therefore, when the oil seal 10 is displaced in the axial direction, it is always blocked by the abutting annular portion 21, and even in that case, the lip portion 13 is not deformed, so that the sealing function is not adversely affected.

This embodiment is constructed as described above, and has a plurality of mounting pieces 2 extending from the annular portion 21 of the retaining ring 20.
Since the fixing pin 30 that is driven into the pin hole 8 provided in the outer peripheral wall 7 of the oil pump cover 1 is passed through 2, the retaining ring 20 is held.
There is an effect that metal chips are not generated at the time of mounting as in the conventional mounting and the reliability is remarkably improved as compared with the holding by frictional force.

In the illustrated embodiment, the end surface of the oil seal 10 and the end surface of the oil pump cover (bearing portion 2) are substantially flush with each other, but the oil seal is installed further on the back side. There may be a gap between the end surface of the lever and the annular portion 21 of the retaining ring 20. Or, conversely, when the end surface of the oil seal 10 is slightly projected from the end surface of the oil pump cover, the annular portion 21 of the retaining ring is brought into contact with the end surface of the oil seal 10,
With a gap between the tip end surface of the oil pump cover and the pin hole 23 of the mounting piece 22 and the pin hole 8 of the outer peripheral wall 7.
It is sufficient to set the correspondence of. Further, this may be a screw hole instead of the pin hole 8 on the outer peripheral wall, and a screw or a bolt may be screwed in instead of the fixing pin 30 as a fastening member.

4 to 6 show a second embodiment similarly applied to the end portion of the oil pump cover. 4 is a front view,
5 is an enlarged cross-sectional view showing a CC portion of FIG. 4, and FIG. 6 is a view showing an arrow D in FIG. In this embodiment, the retaining ring is fixed by a rib portion formed on the outer wall of the oil pump cover.

That is, in the retaining ring 40, a plurality of mounting pieces 42 are formed on the outer peripheral edge of the annular portion 41 corresponding to the ribs 50 formed on the outer wall of the oil pump cover 1A. 42 has a base portion 45 which is obliquely bent in the direction of the top of the rib 50. When a large number of ribs 50 are formed, the ribs are selected so that they have a substantially equal circumferential interval.

The mounting piece 42 is provided with side piece portions 46 which extend further from the base portion 45 and which sandwich the ribs 50 and hold both side walls thereof. Pin holes 43 are formed in each side piece 46 of the mounting piece 42, and pin holes 8A are formed through the ribs 50 of the oil pump cover 1A corresponding to the pin holes 43. Then, the pin hole 4 of the side piece portion 46 of the mounting piece
3 and the pin 50 for fixing through the pin hole 8A of the rib 50
1 is driven in. The other structure is similar to that of the first embodiment.

This embodiment is constructed as described above, and has a plurality of mounting pieces 4 extending from the annular portion 41 of the retaining ring 40.
2 is a rib 5 formed on the outer wall of the oil pump cover 1A
The side piece portion 46 sandwiching 0 is provided, and the rib 50 and the side piece portion 46 are provided.
Since both are fixed by the fixing pin 31 penetrating through, the same effect as the first embodiment can be obtained. Furthermore, since the ribs 50 on the outer wall of the oil pump cover are used for holding and fixing the retaining ring 40, there is a great advantage when it is difficult to form a pin hole because the oil seal housing portion of the oil pump cover 1A is thin. Again, the fixing pin 3
Screws or bolts or rivets can be used in place of 1, and pin holes 8 for screws or bolts
Fix bolts and nuts with A as screw holes or pin holes as simple holes. When riveting, the pin hole 8A is used as a rivet hole.

FIG. 7 is a sectional view showing a third embodiment applied to the end portion of the oil pump cover. This example is
It is designed to prevent the oil seal from coming off while removing the retaining ring. The oil seal 60 includes a metal inner ring 61 having an L-shaped cross section and a rubber material packing 62.
The lip portion 63, which is formed by being covered with, and slides around the rotating shaft 3 of the packing 62, is backed up by the annular spring 15. An oil seal housing 6 is formed at the tip of the oil pump cover 1B.
No. 0 is mounted by pressing its outer periphery covered with the packing 62 into the inner wall surface of the cylinder of the oil seal accommodating portion 6. An end surface 66 of the oil seal 60 excluding the lip portion 63 is substantially flush with the tip surface of the oil pump cover 1B.

The oil seal housing portion 6 of the oil pump cover 1B is formed with a pin hole 8B penetrating from the outer peripheral wall 7B to the inner wall surface of the cylinder. Corresponding to this pin hole 8B, a through hole 67 is formed in the packing 62 on the outer periphery of the oil seal 60 and the metal inner ring 61. Then, the fixing pin 32 is driven from the pin hole 8B of the oil seal housing portion 6 through the packing of the oil seal 60 to the through hole 67 up to the inner ring. No retaining ring is provided. Other configurations are the same as those of the first embodiment.

The present embodiment is constructed as described above, and the oil seal accommodating portion 6 is provided from the outer wall side of the oil pump cover 1B.
Since the fixing pin 32 is driven up to the through hole 67 of the inner ring 61 of the oil seal, no metal scrap is generated, and the oil seal can be removed while eliminating the retaining ring as a separate member. It has the effect of being reliably blocked. In this embodiment, a plurality of fixing pins 32 may be provided. However, since only one peripheral pin 32 can sufficiently prevent the retaining pin 32, the number of components including the retaining ring is not required. There is an advantage. Further, since it is not necessary to dispose the retaining ring near the end surface of the oil seal, the present invention can be applied to the case where the oil seal is installed in a deep part of the bearing portion. The pin hole 8B of the oil seal accommodating portion is a screw hole, and the fixing pin 3
Instead of 2, screws or bolts may be screwed in.

FIG. 8 shows a fourth embodiment. This is also designed to prevent the oil seal from coming off while eliminating the retaining ring. The oil seal 70 is
A metal inner ring 71 having a substantially L-shaped cross section is formed by covering with a packing 72 made of a rubber material, and a lip portion 73 of the packing 72 that slides around the rotating shaft 3 is backed up by an annular spring 15. .

An oil seal accommodating portion 6C is formed at the tip of the oil pump cover 1C, and the outer periphery of the oil seal 70, which is partially covered with packing 72, is inserted into the cylindrical inner wall surface of the oil seal accommodating portion 6C. It is installed. An end surface 76 of the oil seal 70 excluding the lip portion 73 is substantially flush with the tip surface of the oil pump cover 1C. In the inner ring 71 of the oil seal 70, a step is formed on the outer peripheral wall in the cross section, and the small diameter portion 81 in the first half is covered with the packing 72 so as to form a press-fitting margin when inserted into the oil seal housing portion 6C. Has become.

The large diameter portion 82 in the latter half is in direct contact with the inner wall surface of the cylinder of the oil seal accommodating portion 6C, and as shown in FIG. A slit 83 is formed. Further, at the rear end of the inner ring large diameter portion 82, a plurality of locking pieces 84 which are divided by the opening and are directed outward in the radial direction are formed. The locking piece support portion provided with the locking piece 84 and sandwiched between the adjacent slits is made slender, and is provided with a spring function of easily bending. A ring-shaped groove 9 is formed on the inner wall surface of the cylinder at the rear end of the oil seal housing portion 6C of the oil pump cover 1C, that is, at the back side.

In assembling, the locking piece 84 of the oil seal 70 is reduced in diameter from the open end of the oil seal accommodating portion 6C, and is inserted and pushed. When the locking piece 84 reaches the rear end of the oil seal housing portion 6C, the large diameter portion 82 of the inner ring 71 expands and the locking piece 84 engages with the ring-shaped groove 9. As a result, the oil seal 70 is positioned at the predetermined setting position. No retaining ring is provided. Other configurations are the same as those of the first embodiment.

This embodiment is constructed as described above, and the engaging piece 84 formed at the rear end of the oil seal inner ring 71 is engaged with the ring-shaped groove 9 provided in the oil seal accommodating portion of the oil pump cover 1C. Since this is done, this has the effect of reliably preventing the oil seal from coming off while eliminating the need for a retaining ring as a separate member. Further, since frictional force is not required for holding as in the conventional case, metal scraps are not generated even when the locking piece is reduced in diameter and pushed in. Although a plurality of locking pieces 84 are provided in this embodiment, at least one locking piece may be formed. In each of the above-mentioned embodiments, the one applied to the oil seal attachment to the oil pump cover of the automatic transmission is shown, but the present invention is not limited to this, and it can be applied to the oil seal attachment in various bearing portions.

[0032]

As described above, according to the present invention, in the oil seal mounting structure for the rotary shaft, the retaining ring having the annular portion engageable with the end surface of the oil seal press-fitted into the oil seal accommodating portion of the bearing portion. Is provided, the annular portion is opposed to the end surface of the oil seal accommodating portion, and a plurality of mounting pieces formed on the outer peripheral edge of the annular portion are penetrated to form a fastening member such as a pin or a screw member on the bearing portion. Since the engagement hole is engaged with the oil seal, even if pressure is applied to the oil seal, the retaining ring securely held by the bearing portion prevents the oil seal from coming off.

The engaging hole is formed in the outer peripheral wall of the oil seal accommodating portion, and the mounting piece is formed by bending the outer peripheral wall in that direction, or the engaging hole is formed in the rib of the outer wall to mount the engaging hole. Since the piece is provided with the side piece portion that holds both side walls of the rib, the work of fixing the retaining ring can be easily performed outside the oil seal accommodating portion.

Further, a through hole is formed in the metal inner ring of the oil seal press-fitted into the oil seal accommodating portion, and the fastening member is engaged with the through hole of the inner ring from the engaging hole formed in the oil seal accommodating portion. By doing so, the retaining of the oil seal is secured while eliminating the retaining ring.

Further, a locking piece facing outward in the radial direction is formed at the rear end of the metal inner ring of the oil seal, and a ring-shaped groove is formed at the rear end of the oil seal accommodating portion, and the locking is performed. By engaging the piece with the ring-shaped groove, the retaining lock of the oil seal is secured while the retaining ring is not required.

[Brief description of drawings]

FIG. 1 is a front view showing a first embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view showing a portion AA of FIG.

FIG. 3 is a diagram showing an arrow B in FIG.

FIG. 4 is a front view showing a second embodiment.

5 is a cross-sectional view showing an enlarged portion C-C in FIG. 4.

6 is a diagram showing a view D in FIG.

FIG. 7 is a sectional view showing a third embodiment.

FIG. 8 is a sectional view showing a fourth embodiment.

FIG. 9 is a side view showing an oil seal according to a fourth embodiment.

FIG. 10 is a perspective view showing a conventional example.

[Explanation of symbols]

 1, 1A, 1B, 1C Oil pump cover 2 Bearing part 3 Rotating shaft 4 Bearing 5 Oil pump 6, 6C Oil seal accommodating part 7, 7B Outer peripheral wall 8, 8A, 8B Pin hole 9 Groove 10, 60, 70 Oil seal 11 , 61, 71 inner ring 12, 62, 72 packing 13, 63, 73 lip portion 15 spring 20, 40 retaining ring 21, 41 ring portion 22, 42 mounting piece 23, 43 pin hole 30, 31, 32 fixing Pin 45 Base portion 46 Side piece portion 50 Rib 67 Through hole 81 Small diameter portion 82 Large diameter portion 83 Slit 84 Locking piece 100 Oil pump cover 101 Oil seal 102 Detent ring 103 Ring portion 104 Projection 105 Bending piece 106 Claw 109 Shaft hole

Claims (8)

[Claims] 1. An oil seal mounting structure for a bearing portion of a rotary shaft, wherein an oil seal is press-fitted from an end face opening of an oil seal accommodating portion, and an annular portion is engageable with the end face of the oil seal. The retaining ring is provided with its annular portion facing the end surface of the oil seal accommodating portion, and a plurality of attachment pieces having holes are formed on the outer peripheral edge of the annular portion. An oil seal mounting structure, characterized in that the retaining ring is held by the bearing part by engaging with an engaging hole formed in the bearing part through the hole. 2. The engagement hole is formed in an outer peripheral wall of the oil seal accommodating portion, and the attachment piece is bent in the outer peripheral wall of the oil seal accommodating portion in the same direction. The oil seal mounting structure according to claim 1. 3. The engaging hole is formed in a rib formed on an outer wall of the oil seal accommodating portion, and the attachment piece has a base portion bent toward the top side of the rib in such a direction, and extends from the base portion. The oil seal mounting structure according to claim 1, further comprising: a side piece portion that sandwiches the rib and holds both side walls thereof, and the hole is formed in the side piece portion. 4. An oil seal mounting structure in a bearing portion of a rotary shaft, wherein an oil seal having a metal inner ring is press-fitted and mounted in an oil seal accommodating portion, and a through hole is formed in the inner ring of the oil seal. An oil seal mounting structure, characterized in that the fastening member is engaged with an engagement hole formed in the oil seal accommodating portion and a through hole of the inner ring to prevent the oil seal from coming off. 5. The fastening member is a fixing pin, and the engagement hole is a pin hole.
The oil seal mounting structure described in 3 or 4. 6. The fastening member is a male screw member, and the engagement hole is a screw hole.
The oil seal mounting structure described in 3 or 4. 7. The oil seal mounting structure according to claim 3, wherein the fastening member is a rivet, and the engagement hole is a rivet hole. 8. An oil seal mounting structure in a bearing portion of a rotary shaft, wherein an oil seal having a metal inner ring is press-fitted and mounted in an oil seal accommodating portion, and a radial direction is provided at a rear end of the inner ring. An outwardly facing locking piece is formed, and a ring-shaped groove is formed at the rear end of the oil seal accommodating portion, and the locking piece engages with the ring-shaped groove, so that the oil seal is Oil seal mounting structure characterized by retaining.