JP3537997B2 - Oil seal press-fitting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil seal press-fitting device, and more particularly, to an oil seal press-fitting device in which an oil seal is press-fitted between a crankshaft and a flywheel housing.

[0002]

2. Description of the Related Art In order to prevent oil from leaking between a crankshaft and a flywheel housing, an oil seal is conventionally attached to the crankshaft by using a press-fitting device as disclosed in Japanese Patent Application Laid-Open No. 6-159518. It is press-fitted and mounted between the flywheel housing.

FIGS. 2 and 3 show an oil seal press-fitting device disclosed in Japanese Patent Application Laid-Open No. 6-159518. In the drawings, reference numeral 1 denotes a flywheel housing fixed to a cylinder block 3a of an engine 3, and 5 denotes a crank. One end of the crankshaft 5 protrudes from the center of the flywheel housing 1 to the outside of the engine 3, and a positioning hole 7 of a press-fitting device described later is formed at the center of the protruding end surface 5 a. A plurality of set screw holes 9 are formed concentrically around the periphery.

[0004] In order to prevent oil leakage from the engine 3, an oil seal 15 is incorporated in a gap 11 between the flywheel housing 1 and the crankshaft 5 using a press-fitting device 13. The press fitting device 13 is shown in FIG.
As shown in the figure, a cylindrical sliding holder 19 for moving the oil seal 15 is slidably attached to an outer peripheral portion of a cylindrical fixed holder 17 for holding the oil seal 15, and attached to a front surface 17 a of the fixed holder 17. A positioning pin 21 that engages with the positioning hole 7 is mounted, and a plurality of set bolts 23 that are screwed into the set screw hole 9 are provided on the outer periphery of the positioning pin 21 through the sliding holder 19. Rear surface portion 17b of fixed holder 17 and sliding holder 1
9, a hydraulic cylinder 25 for moving the slide holder 19 is provided between the fixed holder 17 and the rear wall 19a.
Has the same diameter as the outer diameter of the crankshaft 1.

[0005] A seating confirmation sensor 27 and an oil seal direction sensor 29 are attached to the front face 17a of the fixed holder 17 and the front face 19b of the sliding holder 19, respectively. 13 is confirmed by the seating confirmation sensor 27, and the oil seal 15 is set.
When the oil seal direction sensor 29 detects that has been set in the correct direction, the control means (not shown) which has received the detection signal enables the hydraulic cylinder 25 to operate.

[0006] In order to mount the oil seal 15 in the gap 11 between the flywheel housing 1 and the crankshaft 5 using the press-fitting device 13, as shown in FIG. After the holding, the positioning pin 21 of the fixed holder 17 is engaged with the positioning hole 7 of the crankshaft 5 and the set bolt 23 of the fixed holder 17 is screwed into the set screw hole 9 as shown in FIG. The press fitting device 13 is positioned and fixed to the crankshaft 5.

After that, the operator turns on an operation button (not shown) to operate the hydraulic cylinder 25 and move the slide holder 19 by a predetermined amount.
Is press-fitted into the gap 11 between the flywheel housing 1 and the crankshaft 5 by the sliding holder 19 and mounted. A pressing spring 31 is mounted between the hydraulic cylinder 25 and the slide holder 19 as shown in FIG.
When the oil pressure in the inside is reduced, the slide holder 19 is separated from the oil seal 15 and the flywheel housing 1 by the restoring force of the pressing spring 31.

[0008]

However, the press-fitting device 13 is used for an oil seal having an inner diameter different from the outer diameter of the fixed holder 17 because of the structure for holding the oil seal 15 on the outer periphery of the fixed holder 17. Could not.
For this reason, conventionally, in a factory production line, a plurality of press-fitting devices are prepared for each oil seal having a different inner diameter, and the actual situation is that a worker uses a press-fitting device for each oil seal.

The present invention has been devised in view of the above circumstances, and provides a press-fitting device for an oil seal capable of press-fitting two types of oil seals having different inner diameters into a predetermined mounting position. Aim.

[0010]

In order to achieve the above object, an invention according to claim 1 is to provide an oil seal on an outer peripheral portion of a cylindrical fixed holder for holding an oil seal in a direction of a front surface of the fixed holder. Slidably mount a cylindrical sliding holder to be moved to the fixed holder, and a positioning pin that can be engaged with a positioning hole provided in the crankshaft is mounted on the front part of the fixed holder, and the crankshaft side is positioned around the positioning pin. A plurality of set bolts to be screwed into set screw holes provided in the slide holder are arranged to penetrate the slide holder, and the fluid for moving the slide holder between the rear surface of the fixed holder and the inner wall surface of the slide holder. In an oil seal press-fitting device provided with a cylinder, a pressing spring is urged on the outer peripheral portion on the tip side of the sliding holder so that the tip always projects forward from the front portion of the sliding holder. Slidably attached to the slider, holding an oil seal with a larger inside diameter than the oil seal on the inner periphery of the slider protruding from the front of the fixed holder, and fixing it to the front of the sliding holder. An oil seal direction sensor for an oil seal held by the holder and the slider is provided.

According to the first aspect of the invention, the oil seal is set in the correct direction on the inner peripheral portion of the slider, and the positioning pin of the fixed holder is engaged with the positioning hole of the crankshaft. After screwing the set bolt on the fixed holder side into the hole and positioning and fixing the press-fitting device to the crankshaft, when the fluid cylinder is operated, the sliding holder moves the oil seal forward, and this is connected to the crankshaft. It is press-fitted and mounted in a predetermined mounting portion between the flywheel housings.

At this time, the slider moves rearward against the spring force of the pressing spring. or,
When an engine with a different specification flows into the production line and an oil seal smaller in inside diameter than the above oil seal is installed, the operator sets the oil seal on the outer periphery of the fixed holder in the correct direction and press-fits it as before. When the fluid cylinder is operated after positioning and fixing the device to the crankshaft, the sliding holder moves the oil seal forward, and press-fits and mounts it on a predetermined mounting portion between the crankshaft and the flywheel housing. Will be done. At this time, the slider moves rearward against the spring force of the pressing spring.

[0013]

Embodiments of the present invention will be described below in detail with reference to the drawings. Although not shown, the structures of the crankshaft and the flywheel housing on the engine side are the same as those of the conventional example shown in FIG. FIG. 1 is a sectional view of a press-fitting device according to an embodiment of the present invention.
3 is also suspended near a worker via a suspending member on a production line of a factory similarly to the conventional press-fitting device 13 shown in FIG. 2, and can be used by the worker while holding it by hand. It is.

Thus, as shown in FIG.
Has a structure in which a cylindrical sliding holder 37 for moving the oil seal 15 is slidably attached to an outer peripheral portion of a cylindrical fixed holder 35 for holding the oil seal 15 as in the case of the conventional press-fitting device 13 described above. The fixed holder 35 has the same diameter as the protruding end of the crankshaft.

A positioning pin 39 for engaging with a positioning hole provided on the protruding end face of the crankshaft is mounted on the front face 35a of the fixed holder 35, and a set screw hole formed on the protruding end face is screwed. A plurality of set bolts 41 are provided around the positioning pin 21 so as to pass through the slide holder 37. Then, the fixed holder 35
A hydraulic cylinder 43 for moving the slide holder 37 is provided on the rear side of the hydraulic cylinder 43.

On the other hand, a piston 43b slidable in the cylinder 43a of the hydraulic cylinder 43 is inserted into the rear wall 37a of the slide holder 37, and the rear wall 37a and the cylinder 43a are centered on the piston 43b. And a pressing spring 45 is stretched between them. An oil seal presence / absence confirmation sensor 47 for confirming the presence / absence of the oil seal 15 and an oil seal direction sensor 49 are mounted on the front surface 37b of the sliding holder 37. When the oil seal 15 is set and the oil seal presence / absence confirmation sensor 47 confirms this,
When the oil seal direction sensor 49 confirms the direction of the oil seal 15 and confirms that the oil seal 15 is set in the correct direction, the hydraulic cylinder 43 can be operated by a command from a control unit (not shown) that has input this signal. It is configured so that

Thus, the press-fitting device 33 according to the present embodiment
Has the following features in addition to the same configuration as the conventional one as described above. That is, in FIG. 1, reference numeral 51 denotes a protrusion protruding from the outer periphery of the slide holder 37, and the protrusion 51 is provided on the slide holder 3.
A cylindrical guide cover 53 is bolted so as to cover the distal end side of the cable 7.

A cylindrical slider 57 slidable along the outer periphery of the slide holder 37 is inserted into a gap 55 formed between the guide cover 53 and the slide holder 37. Is the guide cover 53
Screw plug 5 mounted between the slide holder 37
By a plurality of pressing springs 59 supported by 8,
The tip is the front cover 37 of the guide cover 53 and the slide holder 37.
b is urged to always protrude forward. As shown in FIG. 1, an oil seal 61 having an inner diameter larger than that of the oil seal 15 is held on an inner peripheral portion of a slider 57 protruding from a front portion 37b of the slide holder 37.

Also, on the front surface 37b of the sliding holder 37,
In addition to the oil seal presence / absence confirmation sensor 47 and the oil seal direction sensor 49 described above, an oil seal presence / absence confirmation sensor 63 and an oil seal direction sensor 65 of the oil seal 61 are provided.
When the operator sets the oil seal 61 on the inner periphery of the slider 57 and the oil seal presence / absence confirmation sensor 63 confirms this, the oil seal direction sensor 65 confirms the direction of the oil seal 61, When it is confirmed that the oil seal 61 is set in the correct direction, the hydraulic cylinder 43 is made operable in accordance with a command from the control means that inputs this signal.

The oil seal direction sensors 49, 65
Has the same structure as the oil seal direction sensor 29 mounted on the press-fitting device 13 in FIG.
1 is set in the opposite direction, the oil seals 15 and 61 are not pressed by the openings 15a and 61a,
When the oil seals 15, 61 are correctly set,
To detect that the oil seals 15, 61 have been set in the correct direction.

When the operator presses the oil seal 61 under pressure, the operator sets the oil seal 61 on the inner periphery of the slider 57 in the correct direction, and then engages the positioning pin 39 with the positioning hole of the crankshaft. If the set bolt 41 is screwed into the set screw hole, the press-in device 33
Is positioned and fixed to the crankshaft. At this time, the tip of the slider 57 comes into contact with the flywheel housing.

Thereafter, when the operator turns on an operation button (not shown), oil O is sent from the hydraulic system to the cylinder chamber 69 through the oil passage 67 provided in the piston 43b, and the piston 43b Moves in the direction of arrow A,
Along with this, the sliding holder 37 moves in the same direction against the spring force of the pressing spring 45, and moves the oil seal 61 held on the inner peripheral portion of the slider 57 forward, so that the crankshaft and the flywheel housing are moved. Is press-fitted and mounted in a predetermined mounting portion between them.

When the oil seal 15 is to be mounted on an engine having a different specification, an operator replaces the oil seal 61 with an oil seal 15 on the outer peripheral portion of the fixed holder 35.
Is set in the correct direction, the press-fitting device 33 is positioned and fixed on the crankshaft, and the operation button is turned on. Similarly, as the piston 43b moves in the direction of arrow A, the slide holder 37 moves in the same direction. The oil seal 15 is moved forward so as to be press-fitted into a predetermined mounting portion between the crankshaft and the flywheel housing.

With the movement of the slide holder 37 in the direction of arrow A, the slider 57 in contact with the flywheel housing moves in the direction of arrow B against the spring force of the pressing spring 59. The stroke amount of the slide holder 37 in the direction of arrow A required for press-fitting of 15, 15 is the same, and the slider 57 does not hinder the movement of the slide holder 37 in the direction of arrow A. ing.

Then, press-fitting of the oil seals 15, 61,
When the hydraulic pressure of the hydraulic cylinder 43 increases to a predetermined value sufficient for mounting, the control means stops the hydraulic cylinder 43, opens a discharge valve of a hydraulic system (not shown), and controls the oil O in the cylinder chamber 69.
Is discharged from the oil passage 67. As the oil O is discharged and the hydraulic pressure of the hydraulic cylinder 43 decreases, the sliding holder 37 is sequentially moved in the direction of arrow B by the restoring force of the pressing spring 45. Move to oil seal 15,6
It is separated from 1.

In the drawing, reference numeral 71 denotes a support guide for the set bolt 41 inserted into the rear wall 37a of the slide holder 37. Since the press-fitting device 33 according to the present embodiment is configured as described above, when the engine to which the oil seal 61 is attached flows into the production line, the operator attaches the oil seal to the inner periphery of the slider 57 as described above. After setting 61 in the correct direction, the positioning pin 39 of the fixed holder 35 is engaged with the positioning hole of the crankshaft, the set bolt 41 of the fixed holder 35 is screwed into the set screw hole, and the press-fitting device 33 is connected to the crankshaft. Position and fix.

Thereafter, when the operator turns on the operation button to operate the hydraulic cylinder 43, the oil O is sent from the hydraulic system to the cylinder chamber 69 via the oil passage 67 in the piston 43b, and the piston 43b Moves in the direction of arrow A, whereby the sliding holder 37 moves in the same direction against the spring force of the pressing spring 45, and moves the oil seal 61 held on the inner peripheral portion of the slider 57 forward. And press-fit into a predetermined mounting portion between the crankshaft and the flywheel housing. At this time, the slider 57 in contact with the flywheel housing moves in the direction of arrow B against the spring force of the pressing spring 59.

When the oil seal 61 is mounted and the hydraulic pressure of the hydraulic cylinder 43 increases to a predetermined value, the control means stops the hydraulic cylinder 43 and opens a discharge valve of a hydraulic system (not shown) to open the cylinder chamber 69. Since the oil O is discharged from the oil passage 67, the oil pressure in the cylinder 43a is reduced, and the sliding holder 37 is sequentially moved in the direction of arrow B by the restoring force of the pressing spring 45, and is separated from the oil seal 61. Then, the operator only has to remove the set bolt 41 from the crankshaft, and thereafter, the oil seal 61 may be attached to the engine by the same operation.

When an engine having a different specification flows into the production line and an oil seal 15 having an inner diameter smaller than that of the oil seal 61 is attached, the operator must use the fixed holder 3.
After the oil seal 15 is set in the correct direction on the outer periphery of the cylinder 5, the press-fitting device 33 may be positioned and fixed to the crankshaft, and the operation button may be turned on. Thus, when the operation button is turned on in this manner, the oil O is again sent from the hydraulic system to the cylinder chamber 69 via the oil passage 67, so that the piston 43b moves in the direction of arrow A, and The sliding holder 37 moves in the same direction and the oil seal 15
Is moved forward, and press-fitted and mounted on a predetermined mounting portion between the crankshaft and the flywheel housing.

When the oil seal 15 is attached and the hydraulic pressure of the hydraulic cylinder 43 rises to a predetermined value, the control means stops the hydraulic cylinder 43, opens the discharge valve of the hydraulic system, and opens the oil O in the cylinder chamber 69. Is discharged from the oil passage 67, the hydraulic pressure in the cylinder 43 a is reduced, and the sliding holder 37 is sequentially moved in the direction of arrow B by the restoring force of the pressing spring 45 and separated from the oil seal 61. And
The operator only needs to remove the set bolt 41 from the crankshaft, and thereafter, in the same manner, attach the oil seals 15 and 61 to predetermined positions of the press-fitting device 33 according to the engine, and attach them to the crankshaft and the flywheel. It should be attached between housings.

As described above, according to the present embodiment, two types of oil seals 15, 61 having different inner diameters can be press-fitted and mounted at a predetermined mounting position by one press-fitting device 33. As described above, it is not necessary to separately prepare a press-fitting device for each of the oil seals 15 and 61 having different inner diameters on the production line, and as a result, workability is improved and a line space can be secured.

In the above embodiment, the oil seal 1
The completion of the press-fitting of the pressure cylinders 5 and 61 is detected by an increase in the hydraulic pressure of the hydraulic cylinder 43. However, the movement of the slider 57 moving in the direction of arrow B against the spring force of the pressing spring 59 is detected by the proximity sensor, and May move by a predetermined amount and when the proximity sensor detects this, the hydraulic cylinder 43 may be stopped.

[0033]

As described above, according to the press-fitting device according to the first aspect, two types of oil seals having different inner diameters can be press-fitted and mounted at a predetermined mounting position by one press-fitting device. Therefore, it is not necessary to separately prepare a press-fitting device for each oil seal having a different inner diameter on the production line as in the related art, and as a result, it is possible to improve workability and secure a line space.

[Brief description of the drawings]

FIG. 1 is a sectional view of an oil seal press-fitting device according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a rear part of an engine in which a conventional oil seal press-fitting device and an oil seal are mounted.

FIG. 3 is a cross-sectional view of a conventional press-fitting device and a rear portion of an engine showing an attached state of an oil seal.

[Explanation of symbols]

15,61 oil seal 33 Press-in device 35 Fixed holder 37 Sliding holder 39 Positioning pin 41 set bolt 43 Hydraulic cylinder 43a cylinder 43b piston 45,59 Press spring 47, 65 Oil seal presence sensor 49, 63 Oil seal direction sensor 53 Information cover 57 Slider

Claims (1)

(57) [Claims] 1. A cylindrical slide holder for moving the oil seal toward the front of the fixed holder is slidably mounted on an outer peripheral portion of a cylindrical fixed holder for holding the oil seal. A positioning pin that can be engaged with a positioning hole provided in the crankshaft is mounted, and around the positioning pin, a plurality of set bolts screwed into set screw holes provided on the crankshaft side are used as a sliding holder. In the oil seal press-fitting device, which is disposed so as to penetrate and has a fluid cylinder for moving the sliding holder between the rear surface portion of the fixed holder and the inner wall surface of the sliding holder, the tip side of the sliding holder A cylindrical slider urged by a pressing spring is slidably attached to the outer peripheral portion so that the tip always projects forward from the front surface of the sliding holder. An oil seal having an inner diameter larger than the oil seal is held on the inner periphery of the slider protruding from the surface, and an oil seal direction sensor of the oil seal held by the fixed holder and the slider is provided on the front surface of the sliding holder. A press-fitting device for an oil seal, wherein the device is provided.