JPH0141556B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a new assembly pin tool that can fill lubricating oil into a connecting pin at the same time as the links are press-fitted in the process of connecting and assembling each link of a track chain mounted on a bulldozer or the like.

The assembly of the track chain is described, for example, in Japanese Patent Application Laid-Open No.
This is done using a track press with an assembly jig as disclosed in US Pat. No. 1,280,059 attached to the ram head via a tool bar. (Fig. 1) By the way, in lubricant-filled type track chains, lubricant is filled and sealed into the track pins (connecting pins) after assembly, but prior to this filling, it is necessary to conduct an airtight test by maintaining the vacuum level. For this purpose, a seal testing device as disclosed in Japanese Patent Application Laid-Open No. 59-46531 is used.

Further, an oil exchange or oil supply device such as the one disclosed in Japanese Utility Model Publication No. 58-50160 is used to supply oil to the connecting pins that have passed the seal test, and the assembly of the track chain is completed.

As described above, the conventional assembly process requires a variety of devices, resulting in large-sized equipment, complicated operations, and a long turnaround time, resulting in inefficiency.

The present invention provides a refueling nozzle at the center of the tip of the pin tool of one of the assembly jigs (butching tool and pin tool) attached to the tool bar (on the refueling port side), and connects the refueling nozzle to the vacuum pump device and the refueling tool. By being switchably connected to the pump, centering is automatically performed when the track link is inserted into the pin and bushing, allowing seal checking and lubricating oil to be performed at the same time.

In the pin tool according to the present invention, a flow path extending from the outer circumferential part to the inner circumferential surface is formed in the inner cylinder, the outer circumferential port is connected to the airtightness test device and the lubricating oil supply device, and the inner circumferential port is connected to the airtightness test device and the lubricating oil supply device. It is configured to be constantly connected to the central opening of a spindle that is slidably held at the center of the shaft on the distal end side of the inner cylinder, and the tapered distal end of the spindle is connected to the opening edge of the lubricating oil sealing hole of the connecting pin when press fitting of the link is completed. It is configured to be pressed into contact.

The present invention will be explained below with reference to the embodiments shown in the drawings.

In FIG. 1, a pair of left and right ram heads 2a, 2b of the track press 1 have tool bars 3a, 3b.
The pin tools 4a, 4b and bushing tools 5a, 5b are attached to the jyo insert 6.
Left and right links 9a and 9b are press-fitted into the pin 7 and bushing 8 placed above.

The structure of the connecting portions of adjacent track links is as shown in FIG. 2, and both ends of the connecting pins are press-fitted into the boss portions 10 of the links with a predetermined fitting pressure.

At the center of the axis of the connecting pin, there is a oil supply opening 1 on one end side.
An oil sealing hole 12 with an opening number 1 is formed, and a small hole 13 for oil seepage is opened in the center to supply lubricating oil to the inner surface of the bushing 8.

The structure of the assembly pin tool 4 of the present invention is as shown in FIG. 3, and includes a bottomed outer cylinder 14 fixed to the tool bar 3, a retractable inner cylinder 16 that slides in the axial direction within this outer cylinder, It consists of a spindle 17 that is slidably fitted and held in the center of the tip side of the inner cylinder.

18 is a bolt that fixes the bottom part 15 of the outer cylinder body;
19 is a coil spring that always urges the inner cylinder forward; 20 is an annular insert or holding member for slidably supporting the spindle 17 inside the inner cylinder and securing a flow path; and 20 is a snap spring. 2
1 and airtightly sealed inside and outside by an O-ring 22 to reach the inner surface.
It is equipped with

The spindle 17 has a central opening 24 at the tip and a passage 25 that communicates with the flow path 23 in the holding member, and is always projected toward the tip by a coil spring 26 disposed on the outer periphery of the tip. It is energized as follows. The passage 25 and the flow path 23 are formed so as to communicate with each other at all times within the movable range of the spindle 17.

27 is a spring stopper, 28 is a spindle tip position adjustment/rear end stopper, 29 is a nozzle portion, and 30 is a tapered portion.

The rotation of the inner cylinder 16 is restricted by a guide groove 31 and a pin 32, and a flow passage 33 that connects to the flow passage 23 in the spindle sliding holding member is formed along the inner cylinder side wall 34. 35.

That is, the flow path 33 provided within the inner cylinder is provided within the wall portion 34 and is connected to the inner peripheral port 3.
8 is opened corresponding to the flow path 23 of the spindle sliding holding member, and the outer peripheral side port 37 is connected to the external connection pipe 3.
It is opened so as to be connected to 5.

36 is a slit that ensures movement of the connecting pipe.

A link to be inserted is mounted on the inner cylinder protrusion of the pin tool (same as the bushing tool), and each insertion hole of the link is inserted into both ends of the pin 7 and the bushing 8 by the operation of the ram. The boss portion 10 of the abutting link is pressed and fitted into the distal end surface 14a of the outer cylinder. On the other hand, as described above, a rubber sleeve 40 having an insertion opening 41 in the center is fitted on the oil filler opening side of the pin, and the nozzle 29 of the spindle is automatically aligned with the insertion opening 41 when the link is press-fitted. The tapered portion 30 is then inserted (FIG. 4) and tightly pressed against the edge of the rubber sleeve, which essentially becomes the opening edge of the sealing port.

A vacuum test and lubricating oil supply device as shown in FIG. After a pass/fail judgment is made according to an instruction, lubricating oil is supplied by switching the bubble 52. In an actual field, this operation is repeated several times to supply sufficient lubricating oil into the pin's sealing hole 12.

53 is an oil pump, 54 is a vacuum tank, 55
is a vacuum pump. When the lubricating oil is supplied, the ram is moved back and the stopper 42 is press-fitted into the insertion port 41 to complete the process.

In the present invention, the above-mentioned operations are performed at approximately the same place or within the same process, and it is extremely efficient because it does not require centering operations or equipment as in the past, and does not require a large work area or expensive dedicated equipment. It has the advantage of being economical.

Note that even if the position of the rubber sleeve in the lubricating oil filling hole 12 is slightly different, the nozzle 29 can be easily adapted to it by the action of the spring.

FIG. 6 shows an embodiment of the device that is applied to a type of connecting pin that does not have a rubber sleeve in the lubricating oil filling hole 12, in which an umbrella-shaped elastic member is attached to the tip nozzle portion of the spindle and comes into contact with the opening edge of the filling port. 43 is fixedly installed.

In the present invention, the path of the flow path formed inside the inner cylinder is arbitrary as long as the inner peripheral port always communicates with the central opening 24 of the spindle regardless of the position of the spindle, and the outer peripheral port is Therefore, the attachment position of the connection pipe 35 is also arbitrary.

Furthermore, the structure and position of the spindle sliding holding member are also free as design matters.

(Effects of the Invention) Since the present invention has the above configuration, when the insertion hole of the track link is press-fitted to the track pin by the forward movement of the tool bar, the tip of the spindle is automatically aligned with the lubricating oil sealing hole on the same axis. The oil supply nozzle and the lubricant sealing hole are reliably connected, and subsequent leakage tests and oil supply operations can be performed via the oil supply passage and nozzle in the same state.

[Brief explanation of drawings]

Fig. 1 is a plan view of the track press, Fig. 2 is a partial sectional view of the link connecting portion, Fig. 3 is a partially enlarged sectional view of the pin tool of the present invention before the link is press-fitted, and Fig. 4 is a cross-section of the press-fitted state. 5 is a piping system diagram of a vacuum leak test and lubricating oil supply device connected to the pin tool, and FIG. 6 is a sectional view of the pin tool according to another embodiment. 14... Bottomed outer cylinder for press-fitting, 16... Recessed inner cylinder, 17... Spindle, 29... Nozzle portion.

Claims (1)

[Scope of Claims] 1. A retractable inner cylinder that houses links to be connected and has the same diameter as the connecting pin and that can move forward and backward, and a link pressing outer cylinder that accommodates and holds the inner cylinder and is fixed to a tool bar. In the pin tool, the inner cylinder has a flow path extending from the outer peripheral surface of the inner cylinder to the inner peripheral surface, and the flow path on the outer peripheral surface side is formed through a slit provided in the peripheral wall of the outer cylinder. The pipe line connecting to the vacuum degree airtightness test device and the lubricating oil supply device is connected, and the inner peripheral surface side flow path is located at the axial center of the inner cylinder and has a spring-loaded sliding member that protrudes toward the tip side of the inner cylinder. A lubricating oil sealing device configured to constantly communicate with a central opening of a moving spindle, and a tip end of the spindle having a tapered portion that presses against an opening edge of a lubricating oil sealing hole of a connecting pin. Pin tool for assembling mold connecting pins. 2. The assembly pin tool according to claim 1, wherein the spindle is installed at the center of the inner cylinder shaft via a sliding holding member.