JP2010247297A - Oil seal press-in device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an oil seal press-in device which can seal a clearance between an output shaft and a casing in a differential gear of various types of vehicles. <P>SOLUTION: The oil seal press-in device includes a pair of positioning jigs 5a and 5b which press the differential gear in the direction of width of a vehicle to determine the position of the differential gear in the direction of width of the vehicle and have positioning fittings 16a and 16b to which an oil seal pressed-in to the differential gear is externally fitted to guide the oil seal to a part between the output shaft of the differential gear and the casing, a pair of press-in jigs 6a and 6b for pressing-in the oil seal to the differential gear positioned by the positioning jigs, a pair of first moving means 4a and 4b for moving the positioning jigs to the differential gear in the direction of width of the vehicle and pressing the differential gear by the positioning jigs to hold a positioning state for positioning the differential gear to the pressing-in operating position of the oil seal and a pair of second moving means 3a and 3b for moving the press-in jigs to the differential gear in the direction of width of the vehicle. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an oil seal press-fitting device that seals a gap between a pair of output shafts of a differential device that absorbs a rotation difference between left and right drive wheels that occurs when a vehicle turns, and a casing of the differential device.

  In general, a driving wheel of an automobile is driven with a driving force from a propeller shaft distributed to the left and right by a differential device (differential device), and is driven in a state where the differential between the left and right driving wheels generated during turning is absorbed. It has become so. As disclosed in Patent Document 1 (Japanese Patent Laid-Open No. 2007-30671), the differential device is configured such that an oil seal is press-fitted between a pair of output shafts of the differential device and the casing, and the oil in the casing is externally supplied. It is provided not to leak.

  The press-fitting of an oil seal provided between the output shaft of the differential device and the casing will be described with reference to FIG. Conventionally, in order to press-fit the oil seal 57 into the workpiece 51 conveyed by the conveyor, the air cylinder 53 positions and fixes the center position 52 of the workpiece 51. Specifically, the air cylinder 53 is advanced with respect to the work 51 conveyed by a conveyor and supported by a pallet (not shown), and the advancement of the positioning pin 55 pressed by the air cylinder 53 is caused by the stopper 59 in FIG. While stopping at the position of the two-dot chain line, the workpiece 51 is fixed with the positioning pin 55, and the oil seal 57 is press-fitted in a state where the workpiece is fixed.

  As an oil seal press-fitting device, Patent Document 2 (Japanese Patent Laid-Open No. 2000-84752) has been proposed by the present applicant. Patent Document 2 discloses a pair of press-fit actuators that are opposed to openings at both ends of a work to which an oil seal is to be inserted and that can move in synchronization with each other, and can be attached to and detached from the press-fit actuators. A press fitting that is attached to the stocker, a stocker that holds the press fitting that has been removed from the press fitting actuator, and the press fitting that has been removed from the stocker is moved to a predetermined oil seal holder, and the oil seal is A loader that fits into the press-fitting fitting and attaches the press-fitting fitting to the press-fitting actuator is provided to automate the press-fitting operation of the oil seal.

JP 2007-30671 A JP 2000-84752 A

However, Patent Document 2 discloses a press-fitting device that automates the press-fitting work of an oil seal that is press-fitted into both ends of an axle housing. In the oil seal that is press-fitted between an output shaft of a differential and a casing, Not applicable.
Further, Patent Document 1 shows a structure in which an oil seal is press-fitted between an output shaft of a differential device and a casing, but does not describe the press-fitting work of the oil seal.

  Further, in the conventional method using the air cylinder shown in FIG. 11, the work center position of the work set on the pallet is different depending on the vehicle type, so that it cannot be press-fitted. Even if the work center positions are the same, the oil seal press-fit end position differs depending on the vehicle type, so that the press-fit end position is shifted and cannot be press-fitted. Furthermore, although it is necessary to select three types of press-fitting methods, that is, press-fitting on both sides, press-fitting only on the right side, and press-fitting only on the left side, the conventional press-fitting method only requires press-fitting from both the left and right sides. Can not cope with.

  Accordingly, an object of the present invention is to provide an oil seal press-fitting device capable of sealing a gap between an output shaft and a casing of various types of differential gears in view of the problems of the related art.

  In order to solve such a problem, an oil seal that seals a gap between a pair of output shafts of a differential device that absorbs a rotation difference between left and right drive wheels that occurs when a vehicle turns and a casing of the differential device is provided in the casing. In the oil seal press-fitting device that press-fits into the vehicle, the differential device is pressed in the vehicle width direction to determine the position of the differential device in the vehicle width direction, and the oil seal that is press-fitted into the differential device is fitted externally. A pair of positioning jigs having positioning fittings for guiding between the output shaft of the differential device and the casing, and a pair of press fitting treatments for press-fitting an oil seal into the differential device positioned by the positioning jig A pair of first moving means for moving the positioning jig relative to the differential device in the vehicle width direction, and a pair of first moving means for moving the press-fitting jig relative to the differential device in the vehicle width direction. 2 The first moving means holds a positioning state in which the differential device is pressed by the positioning jig to position the differential device at an oil seal press-fitting work position in the vehicle width direction. It is composed of a cylinder with a brake.

According to this invention, even if the position in the vehicle width direction of the differential gear of the vehicle set on the pallet or the position where the oil seal is press-fitted varies depending on the vehicle type, the press-fitting stroke can be changed along the position. Therefore, if the same shape of the positioning jig can be applied, the oil seal can be press-fitted regardless of the vehicle type. Therefore, an oil seal press-fitting device that can be applied to various vehicle types can be provided.
The first moving means is a cylinder with a brake that holds a positioning state in which the differential device is pressed by the positioning jig to position the differential device at an oil seal press-fitting work position in a vehicle width direction. Since it is comprised, it can hold | maintain and hold | maintain in the state which pressed the differential device from the right and left both sides, and applied the pressure. Furthermore, the oil seal can be press-fitted while the positioning state is maintained by pressing the differential device with a cylinder with a brake, and the oil seal can be securely press-fitted, so that the problem that the oil seal is turned up can be prevented.

In addition, there is provided a connection means for switching between connection and non-connection between the positioning jig and the press-fitting jig.
Thus, by providing a connecting means for switching between connection and non-connection between the positioning jig and the press-fitting jig, the positioning jig and the press-fitting jig can be operated together or separately. Therefore, even if the position of the differential gear or the position where the oil seal is press-fitted varies depending on the vehicle type, it is possible to press-fit the oil seal by changing the press-fitting stroke along the position. In particular, it is easy to cope with one-side press-fitting such as only the left side and only the right side.

Further, the connecting means moves the positioning jig together with the press-fitting jig with respect to the differential device at the time of connection to position the differential device in the vehicle width direction, and positions the press-fit jig at the time of non-connection. It is characterized in that, independently of the tool, the oil seal is advanced independently and an oil seal is press-fitted into the differential device by the second moving means.
In this way, it is possible to provide an oil seal press-fitting device that can seal the gap between the output shaft and the casing of the differential device of various types of vehicles by switching between connection and non-connection of the connection means. Also, it is easy to cope with both-side press-fitting, press-fitting only on the right side, and press-fitting only on the left side.

  Furthermore, the connecting means is configured to be installed in the press-fitting jig. Since the connecting means is housed in the press-fitting jig, the space can be used effectively, and there is no intrusion of dust and the durability is improved.

  According to the present invention, it is possible to provide an oil seal press-fitting device capable of sealing a gap between an output shaft and a casing of a differential device of various vehicle types.

1 is an overall view of an oil seal press-fitting device according to an embodiment of the present invention. It is a figure explaining the press-fit jig | tool which concerns on embodiment of this invention. It is a figure explaining the press injection process using the oil seal press-fitting device concerning Embodiment 1, and has shown the delivery state of an oil seal. It is a figure explaining the press injection process using the oil seal press-fitting device concerning Embodiment 1, and has shown a work conveyance state. It is a figure explaining the press-fit process using the oil seal press-fitting device concerning Embodiment 1, and shows the state where the work center and press-fit metal fittings were connected. It is a figure explaining the press injection process using the oil seal press-fitting device concerning Embodiment 1, and has shown the advance state of a servo press. It is a figure explaining the press-fit process using the oil seal press-fitting device concerning Embodiment 1, and shows the state where the work center and press-fit metal fittings were disconnected. It is a figure explaining the press injection process using the oil seal press-fitting device concerning Embodiment 1, and shows the state where an oil seal is press-fitted. It is a figure explaining the press injection process using the oil seal press-fitting device concerning Embodiment 1, and shows the state after oil seal press-fitting. It is a figure explaining the press injection process using the oil seal press-fitting device concerning Embodiment 2, and shows the state where an oil seal is press-fitted. It is a figure explaining the conventional oil seal press-fitting apparatus.

  Hereinafter, the present invention will be described in detail with reference to the embodiments shown in the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the components described in this embodiment are not intended to limit the scope of the present invention only to specific examples unless otherwise specified. Only.

An oil seal press-fitting device according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2. An oil seal press-fitting device shown in FIG. 1 includes a press-fitting jig 6 for press-fitting an oil seal 7 into a work 1, a servo press (second moving means) 3 for moving the press-fitting jig 6, and a work center (described later) And a cylinder with brake (first moving means) 4 for moving a positioning jig).
Here, a differential device that absorbs the rotation difference between the left and right drive wheels generated when the vehicle turns and a casing that accommodates the workpiece 1 are used as the workpiece 1. The workpiece 1 is conveyed by a conveyor and supported by a pallet 8. . An oil seal press-fitting device according to an embodiment of the present invention is an oil seal press-fitting device that press-fits an oil seal that seals a gap between an output shaft of a differential and a casing of the differential into the casing.

  2 is an enlarged view of FIG. 1 for explaining the press-fitting jig 6. The press-fitting jig 6 presses the workpiece in the vehicle width direction and positions the workpiece in the vehicle width direction by pressing the workpiece in the vehicle width direction. In addition, a pair of work centers (positioning jigs) 5 having positioning metal fittings 16 for externally fitting an oil seal press-fitted into the work and guiding them between the work output shaft and the casing are provided. Composed.

The connecting means 10 having an L shape switches between connection and non-connection between the work center 5 and the press-fitting jig 6. At the time of connection, since the L-shaped bottom surface of the connecting means 10 is located on the back surface of the work center 5, the work center 5 moves forward via the connecting means 10 together with the press-fitting jig 6 moved by the servo press 3. The center 5 and the press-fitting jig 6 can move together (see FIG. 5).
On the other hand, at the time of non-connection, the work center 5 and the press-fitting jig 6 move independently independently because the L-shaped bottom surface of the connection means 10 becomes free. FIG. 2 shows a state where the work center 5 and the press-fitting jig 6 are not connected.

The work center 5 is arranged coaxially with the servo press 3 and is moved back and forth toward the work 1 by the cylinder 4 with a brake.
Further, the press-fitting jig 6 is provided with a press-fitting metal fitting 15 at the tip, and the press-fitting metal fitting 15 is disposed on the outer periphery of the pressing metal fitting 16 provided at the tip of the work center 5 to form a double structure. The jig 6 is moved with respect to the workpiece, and an oil seal fitted in advance to a positioning fitting 16 provided at the tip of the workpiece center 5 is press-fitted. Thereby, it press-fits straight with respect to the position which an oil seal press-fits. Therefore, the oil seal that seals the gap between the output shaft of the differential and the casing can be reliably press-fitted into the casing.

Specifically, after the oil seal is fitted to the positioning fitting 16, the tip end surface 14 positioned at the forefront of the press fitting 15 is brought into contact with the casing of the workpiece, and the press fitting jig 6 is moved by the servo press 3. Press-fitted by moving forward. Details will be described with reference to FIGS.
The oil seal press-fitting device of the present invention is configured by providing the above-described constituent members in pairs on the left and right sides with the workpiece sandwiched in the vehicle width direction.

(Embodiment 1)
Next, an oil seal press-fitting process using the oil seal press-fitting device according to the first embodiment will be described with reference to FIGS. Embodiment 1 shows the case where an oil seal is press-fitted from both the left and right sides of a workpiece.

  The oil seal press-fitting device shown in FIG. 3 includes press-fitting jigs 6a and 6b for press-fitting oil seals 7a and 7b to a work, servo presses 3a and 3b for moving the press-fitting jigs 6a and 6b, respectively, Positioning brackets 16a, which determine the position of the workpiece in the vehicle width direction by pressing in the direction and guide the oil seals 7a, 7b press-fitted into the workpiece between the output shaft of the workpiece and the casing, A pair of work centers (positioning jigs) 5a, 5b having a 16b, cylinders 4a, 4b with brakes for moving the work centers 5a, 5b, respectively, and connecting means 10a, 10b provided in the press-fitting jig It is configured. Since these components are the same as those in FIGS. 1 and 2, the description thereof is omitted. Moreover, the same code | symbol is shown in order to abbreviate | omit description to the part of the same structure as FIG. 3 shown in FIGS.

  First, as shown in FIG. 3, the brake-equipped cylinders 4a and 4b are moved to advance the work centers 5a and 5b, respectively, and the oil seals 7a and 7b are transferred to the work centers 5a and 5b. At this time, the oil seals 7a and 7b are removably fitted to the outer periphery of the positioning fittings 16a and 16b of the work centers 5a and 5b.

When the oil seals 7a and 7b are transferred to the work centers 5a and 5b, as shown in FIG. 4, the work 1 is conveyed by a conveying means such as a conveyor. The workpiece 1 is supported by a pallet 8.
Next, as shown in FIG. 5, the connecting means 10a is raised to connect the work center 5a and the press-fitting jig 6a. At this time, the L-shaped bottom surface of the connecting means 10a is located on the back surface of the work center 5a. Similarly, the connecting means 10b is also raised to connect the work center 5b and the press-fitting jig 6b. The pallet that supports the workpiece 1 is not shown.

Thereafter, as shown in FIG. 6, the servo presses 3 a and 3 b are respectively advanced with respect to the workpiece 1. At this time, the work center 5a and the press-fitting jig 6a, and the work center 5b and the press-fitting jig 6b are connected to each other by the connecting means 10a and 10b, and a mechanism capable of operating together is provided. That is, the work centers 5a and 5b and the press-fitting jigs 6a and 6b are moved forward with respect to the work 1 by moving the servo presses 3a and 3b forward in the connected state.
The work centers 5a and 5b determine the position of the work 1 in the vehicle width direction by pressing the work 1 in the vehicle width direction, and externally fit oil seals 7a and 7b that are press-fitted into the work. Positioning brackets 16a and 16b for guiding between the output shaft and the casing, and presses and holds the workpiece 1 in the vehicle width direction. Thereby, the work 1 is pressed by both the work centers 5a and 5b, and the press-fitting work position of the oil seal is determined. Reference numerals 4a and 4b are brake cylinders.

  After being positioned by the work centers 5a and 5b, as shown in FIG. 7, the brake cylinders 4a and 4b are braked and the positioning brackets 16a and 16b are pressed against the work 1 in the vehicle width direction. The press fittings 6a and 6b are retracted several millimeters, the L-shaped bottom surfaces of the connecting means 10a and 10b are separated from the back surfaces of the work centers 5a and 5b, and the connecting means 10a and 10b are lowered, and the work center and press fitting jig And are not connected.

  In this way, by connecting the work center 5a and the press-fitting jig 6a to each other by the connecting means 10a, the work center 5a and the press-fitting jig 6a can be operated independently. As shown, the servo press 3a is advanced to bring the press-fit jig 6a into contact with the casing of the work 1, and the servo press 3a is further moved to advance the press-fit jig 6a to fit the positioning fitting 16a of the work center 5a. The oil seal 7a to be pressed is press-fitted into the work 1. Similarly, the oil seal 7b is also press-fitted.

After the press-fitting of the oil seals 7a and 7b is completed, as shown in FIG. 9, the press-fitting fittings 6a and 6b are retracted from the work 1 by the servo presses 3a and 3b, the work centers 5a and 5b are retracted from the work 1 by the cylinders 4a and 4b with brakes. Then, each component constituting the oil seal press-fitting device returns to the position before press-fitting.
In this way, the aforementioned oil seal press-fitting process is repeated. This oil seal press-fitting work depends on the equipment width, but even if the work center position and work width are different, the difference can be absorbed by the stroke of movement by the servo press. It is possible to seal the gap between the output shaft and the casing.

(Embodiment 2)
Next, an oil seal press-fitting process using the oil seal press-fitting device according to the second embodiment will be described with reference to FIG. Embodiment 2 shows a case where an oil seal is press-fitted from one side of a workpiece.

  The oil seal press-fitting device shown in FIG. 10 includes press-fitting jigs 6a and 6b, servo presses (second moving means) 3a and 3b for moving the press-fitting jigs 6a and 6b, and a work center (positioning jig). 5a, 5b, cylinders with brakes (first moving means) 4a, 4b for moving the work centers 5a, 5b, respectively, and connecting means 10a, 10b provided in the press-fitting jig. Since these components are the same as those in FIGS. 1 and 2 as in the first embodiment, description thereof is omitted.

This embodiment is different from the press-fitting from both the left and right sides described in the first embodiment in that the left and right operations are different when the servo press is advanced to press-fit the oil seal.
That is, on the left side where the oil seal 7a is press-fitted, the cylinder 4a with brake is braked after being positioned by the work center 5a, and the press-fitting bracket 6a is pressed against the workpiece 1 in the vehicle width direction. Is retracted several mm, the L-shaped bottom surface of the connecting means 10a is separated from the back surface of the work center 5a, the connecting means 10a is lowered, and the work center 5a and the press-fitting jig 6a are disconnected.

  In this way, by connecting the work center 5a and the press-fitting jig 6a to each other by the connecting means 10a, the work center 5a and the press-fitting jig 6a can be operated independently. As shown in the figure, the servo press 3a is advanced to bring the press-fitting jig 6a into contact with the casing of the workpiece 1, and the servo press 3a is further moved to advance the press-fitting jig 6a to be fitted to the press fitting 16a. Is pressed into work 1.

On the other hand, on the right side where the oil seal is not press-fitted, the brake-equipped cylinder 4b is braked after being positioned by the work center 5b, and the positioning bracket 16b is fixed in a state of being pressed against the work 1 in the vehicle width direction. On the right side where the oil seal is not press-fitted, the work center 5b and the press-fitting jig 6b are maintained in a connected state. Therefore, the work center 5a and the press-fitting jig 6a cannot be operated independently, and even if the servo press 3b is advanced, press-fitting treatment is performed. The tool 6b does not move forward.
The work center 5b is held in a state where the work 1 is pressed in the vehicle width direction in the same manner as the left work center 5a. Therefore, the work 1 is pressed by both the work centers 5a and 5b, and the press-fitting work position of the oil seal is determined.

After the press-fitting of the oil seal 7a is completed, the press-fitting metal fitting 6b is retracted several mm, the L-shaped bottom surface of the connecting means 10b is separated from the back surface of the work center 5b, the connecting means 10b is lowered, and the press-fit with the work center 5b is performed. The jig 6b is disconnected. After that, as in the first embodiment, the press fittings 6a and 6b are retracted from the workpiece 1 by the servo presses 3a and 3b, and the work centers 5a and 5b are retracted from the workpiece 1 by the brake cylinders 4a and 4b. The component returns to the position before press-fitting.
In this way, the oil seal press-fitting operation is performed even with one-side press-fitting, and the oil seal press-fitting process is repeated. Although FIG. 10 shows the left side press-fitting of the workpiece 1, the right side press-fitting can be performed in the same manner.

Therefore, not only both-side press-fitting but also press-fitting only on the right side and press-fitting only on the left side can be performed, so that it is possible to seal the gap between the output shaft and the casing of the differential device of various vehicle types.
Although not shown, the oil seal press-fitting device according to the embodiment of the present invention has a control unit for controlling the movement of the servo press and the cylinder with brake, and the procedure described in the first and second embodiments is controlled by the control unit. Is done.

  According to the present invention, it is possible to seal the gap between the output shaft and the casing of various types of differential gears, which is advantageous when applied to an oil seal press-fitting device that can be automated.

1 Workpiece 3, 3a, 3b Servo press (second moving means)
4, 4a, 4b Cylinder with brake (first moving means)
5, 5a, 5b Work center (positioning jig)
6, 6a, 6b Press fitting jig 7, 7a, 7b Oil seal 10, 10a, 10b Connecting means 15 Press fitting 16 Positioning bracket

Claims (4)

An oil seal press-fitting device that press-fits an oil seal that seals a gap between a pair of output shafts of a differential device that absorbs a rotation difference between right and left drive wheels generated when the vehicle turns and a casing of the differential device into the casing. In
The differential device is pressed in the vehicle width direction to determine the position of the differential device in the vehicle width direction, and an oil seal that is press-fitted into the differential device is fitted over the output shaft and casing of the differential device A pair of positioning jigs having positioning brackets for guiding them, a pair of press-fitting jigs for press-fitting an oil seal into the differential device positioned by the positioning jig, and the positioning jig A pair of first moving means for moving the differential device in the vehicle width direction; and a pair of second moving means for moving the press-fitting jig in the vehicle width direction with respect to the differential device;
The first moving means is constituted by a cylinder with a brake that holds a positioning state in which the differential device is pressed by the positioning jig to position the differential device at an oil seal press-fitting work position in the vehicle width direction. An oil seal press-fitting device.   The oil seal press-fitting device according to claim 1, further comprising a connecting unit that switches between connection and non-connection between the positioning jig and the press-fitting jig.   The connecting means moves the positioning jig forward with respect to the differential device together with the press-fitting jig at the time of connection to position the differential device in the vehicle width direction. 3. The oil seal press-fitting device according to claim 2, wherein the oil seal is press-fitted separately and the oil seal is press-fitted into the differential device by the second moving means.   The oil seal press-fitting device according to claim 2 or 3, wherein the connecting means is provided in the press-fitting jig.

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