JPH0321862Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a press-fitting device for parts, and more particularly, to a press-fitting device that can simultaneously assemble a press-fitting part and a C-ring for preventing slippage. This is used, for example, in the field of assembly work where bearings and the like are press-fitted into workpieces.

[Prior art]

In a knuckle that transmits steering force to the steering wheels of an automobile, a ring groove is formed at the entrance of a hole into which a bearing for supporting a spindle is installed. A snap ring is fitted into such a ring groove to prevent the bearing from falling off after being press-fitted.
The snap spring is a C-shaped spring ring whose diameter can be contracted freely, and when force is applied inward from the outer periphery, the diameter contracts.
When the force is removed, the diameter expands. When assembling two things that require applying force in different directions, such as radial diameter reduction and axial press-fitting, into a single hole in a workpiece, conventionally they were typically worked on separately. be. Using the above example, first the bearing is press-fitted into the hole to a predetermined position. After that, for example, JP-A-59-
It is separately held in a reduced diameter state using a C-ring assembly device such as that shown in Japanese Patent No. 196133, and is inserted into the hole up to the position of the ring groove. Even if there is a change in the press-fitting condition of the bearing, the inner periphery of the hole protrudes inward with the C-ring biting into the ring groove, so the bearing will be blocked by the C-ring and will not slip out of the hole. do not have.

As mentioned above, the work of assembling two items such as bearings and C-rings into holes is performed independently, which poses the problem of requiring time and effort. In particular, when the bearing is incorporated into a car's nut, the bearing itself is relatively large and the C-ring used therein is also large. Therefore, there are problems in that a large force is required to reduce the diameter of the C-ring, a special tool must be prepared separately, and it is not easy to adapt it to assembly operations in an automobile manufacturing factory.

[Purpose of invention]

The present invention was created in view of the above-mentioned problems, and its purpose is to greatly reduce the time and effort required when assembling two items in one hole by applying force in different directions, and to reduce the amount of work required for the work. It is an object of the present invention to provide a parts press-fitting device that can perform the following operations in one continuous operation and facilitate and speed up assembly.

[Structure of the idea]

The features of the parts press-fitting device of the present invention are as follows. A component holding member is elastically installed to hold and press-fit the component to be press-fitted into the hole of the workpiece and the C-ring assembled in the ring groove at the entrance of the hole. A tapered guide member is elastically provided on the outer periphery of the component holding member to reduce the diameter of the C-ring when the component holding member retreats due to a press-fitting reaction force when the component is press-fitted. A diameter reduction maintaining member is elastically installed to maintain the reduced diameter state of the C-ring whose diameter has been reduced by the taper guide member, and to come into contact with the workpiece during press-fitting and guide and deliver the C-ring into the hole of the workpiece. ing.

〔Example〕

Hereinafter, the present invention will be described in detail based on examples thereof. FIG. 1 is a sectional view including the parts press-fitting device of the present invention, in which the device is placed facing a bearing hole 2 formed in a knuckle, which is a workpiece 1.
In this example, the pedestal 3 to which the knuckle 1 is fixed is
, a component press-in device advances toward the hole of the nutcle 1 and press-fits the component 4, a bearing. Reference numeral 5 denotes a press-fitting machine to which this device is installed, and a base body 9 of the device is attached to the tip 6 of the press-fitting machine with bolts 7 or the like.

At the tip of this base body 9, there is a cylindrical part 11 that has a spring 10 interposed therein and guides the movement of a component holding member 13, which will be described next, and a rear end surface 1 of the component holding member.
A pressing surface 12 is formed on the outer periphery of the cylindrical portion 11 to press the cylindrical portion 3a. The component holding member 13 includes a bearing 4 that is press-fitted into the hole 2 of the nutcle 1, and a ring groove 14 at the entrance of the hole.
The C-ring 15 incorporated in the C-ring 15 is held and press-fitted into the C-ring 15, and the spring 10 mentioned above has a weaker spring force than the other springs 17 and 19 described later. Note that the component holding member 13 has a holding portion 13b inserted into the inner race 4a of the bearing 4 at the tip thereof, and a hook mechanism 13c for preventing the held bearing 4 from falling off is provided at the tip.

On the outer periphery of the component holding member 13, when the spring 10 contracts due to the press-fitting reaction force when the bearing 4 is press-fitted and the component holding member 13 retreats, a tapered guide member 16 that reduces the diameter of the C-ring 15 is formed.
It is resiliently installed by a spring 17. This taper guide member forms one cylindrical body as shown in FIG. 2 together with the diameter reduction maintaining member 18 described below.
For example, three positions can be mutually displaced. Note that the length of the inclined inner surface 16a formed in the tapered guide member 16 in the pressing direction is approximately equal to the stroke of the component holding member 13.

The diameter reduction maintaining member 18 maintains the reduced diameter state of the C-ring 15 whose diameter has been reduced by the taper guide member 16, and also contacts the end surface of the knuckle 1 during press-fitting to keep the C-ring 15 in the bearing hole of the knuckle 1. 2
It is guided inside and delivered, and is elastically installed by a spring 19 with the strongest elastic force. In addition,
The inner diameter of the diameter reduction maintaining member 18 is equal to or less than the diameter of the bearing hole 2, and the taper guide member 16 and the diameter reduction maintaining member 17 are both guided by the outer peripheral surface of the base body 9 described above and are concentric. There is.

Incidentally, a pin body 20 for preventing rotation is provided to protrude from the diameter reduction maintaining member 18 toward the base body 9 so as not to rotate relative to the base body 9. On the other hand, a long groove 21 is formed in the base body 9 in the press-fitting direction, so that the pin body 20 can be displaced only in the press-fitting direction. In addition, 22 are the cylindrical portion 11 of the base body 9 and the component holding member 13 as such a pin body.
23 is also provided between the taper guide member 16 and the diameter reduction maintaining member 18. moreover,
The base body 9 has a cylindrical diameter reduction maintaining member 18.
An outer cylindrical body 24 for holding the tapered guide member 16 and the tapered guide member 16 is attached via a screw 25. Note that there is a hole 2 on the back of this outer cylinder for a bolt that adjusts the elastic force of the spring 17 mentioned above.
6 is drilled.

According to such an embodiment, the bearing 4 and the C-ring 15 can be assembled in the bearing hole 2 of the knuckle 1 in one continuous operation as follows. First, the C-ring 15 and the bearing 4 are inserted into the holding part 13b of the component holding member 13, and as shown in FIG. A C-ring 15 is held in between so as to be substantially concentric.

When the press-fitting machine presses the base body 9 in the direction of arrow 27 against the knuckle 1 fixed to the pedestal 3, the component holding member 13 approaches the knuckle 1, and the bearing 4 is press-fitted into the bearing hole 2 of the knuckle 1. begins to be Since the outer race 4b of the bearing 4 hits the end of the bearing hole 2, the spring 10 supporting the component holding member 13 contracts as shown in FIG. 3 due to the press-fitting reaction force, and the advancement of the component holding member 13 is stopped. Since the springs 17 and 19 have a large elastic force, the taper guide member 16 and the diameter reduction maintaining member 18 move forward toward the knuckle 1 at this time. Since the tapered surface of the inner surface 16a of the tapered guide member 16 acts to press the outer periphery of the C-ring 15 toward the center, the diameter of the C-ring 15 is reduced while being held by the component holding member 13. When the C-ring 15 is reduced to the minimum diameter by advancing the taper guide member 16, the reduced diameter state is maintained by the reduced diameter maintaining member 18.

In this state, the stroke that was previously reached becomes zero, and the rear end surface 13a of the component holding member 13
Since the bearing 4 is in contact with the pressing surface 12 on the outer periphery of the base member 9, the bearing 4 is press-fitted into the bearing hole 2 by the pressure of the base member 9. As the component holding member 13 moves, the tip of the tapered guide member 16 comes into contact with the knuckle 1;
Since the spring that resiliently supports the tapered guide member 16 contracts, the tapered guide member 16 moves backward relative to the diameter reduction maintaining member 18. At this time,
C- by the taper guide member 16 as shown in FIG.
Although the diameter reduction action of the ring 15 is canceled, the diameter reduction action of the diameter reduction maintaining member 18 is maintained. When the tip of the diameter reduction maintaining member 18 comes into contact with the end surface of the workpiece, the spring 19 supporting the diameter reduction maintaining member contracts and the bearing 4 is press-fitted, and the C-ring 15 is also inserted into the bearing hole 2. be done.

When the C-ring reaches the ring groove 14, the C-ring 15 fitted into the groove is released from the reduced diameter state, expands in diameter, and is fixed as shown in FIG. When the component holding member 13 is pulled, the hook mechanism fixing the bearing 4 is released, and the assembly of the nut 1 as shown in FIG. 6 is completed. Since the bearing 4 is press-fitted inward from the C-ring 15, the bearing 4 will not slip out or fall off due to the C-ring.

In the above-described embodiment, an example was described in which the press-fitting machine 5 equipped with a component press-fitting device moves in the direction of the workpiece 1 fixed to the pedestal 3. Since this can be performed by relative displacement with the workpiece, the same function can be achieved even if the workpiece is attached to a presser and the component press-in device is fixed to a pedestal.

[Effect of idea]

As can be seen from the description of the embodiments above, the present invention has the following features:
a component holding member that holds the component and the C-ring;
A tapered guide member that reduces the diameter of the C-ring when the component holding member retreats due to press-fit reaction force, and a diameter reduction maintaining member that maintains the reduced diameter state of the C-ring and guides it into the hole of the workpiece and transfers it. Therefore, the time and effort required for the work can be greatly reduced, and the operations required for the work can be performed in one continuous motion. Therefore, it is possible to realize smooth and speedy assembly, and it is possible to adapt it to the assembly line work at the production site.

[Brief explanation of drawings]

Fig. 1 is a sectional view including an embodiment of the parts press-fitting device of the present invention, showing an initial state of press-fitting work, Fig. 2 is an end view of a cylindrical body consisting of a taper guide member and a diameter reduction maintaining member, and Fig. 3 5 to 5 are sectional views illustrating the displacement state of each member during a press-fitting operation, and FIG. 6 is a sectional view of an example of a workpiece in which parts are assembled. 1... Work (knuckle), 2... Hole (bearing hole), 4... Part (bearing), 13... Part holding member, 14... Ring groove, 15... C-ring, 16... Taper guide Member, 18... Diameter reduction maintenance member.

Claims (1)

[Claims for Utility Model Registration] A component holding member is elastically installed to hold and press-fit a component to be press-fitted into a hole in a workpiece and a C-ring to be incorporated into a ring groove at the entrance of the hole. When the component holding member retreats due to a press-fitting reaction force when the component is press-fitted to the outer periphery of the component holding member, a tapered guide member is elastically installed to reduce the diameter of the C-ring, and the diameter is reduced by the tapered guide member. A part characterized in that a diameter reduction maintaining member is elastically installed to maintain the reduced diameter state of the C-ring and to guide and deliver the C-ring into the hole of the workpiece by contacting the workpiece during press-fitting. Press-fit device.