JPH0639795B2 - Lubrication device for link connecting bucket and arm in construction machine - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a lubricating device for a link connecting a bucket and an arm in a construction machine in order to control the movement of the bucket.

[Conventional technology]

In a construction machine, for example, a shovel, a bucket is connected to an arm forming a front by a pin and is also connected to the arm via a link mechanism. This link mechanism is composed of two links, the first link is connected to the arm, the second link is connected to the bucket by a pin, and the two links are connected by a pin. The hydraulic cylinder has rods attached to the pins connecting the links, and the case is connected to the arms by the pins.

[Problems to be Solved by the Invention]

In such a link mechanism, the lubrication for the pin is
Greasing that connects the pin end surface and the contact surface of the pin and the link to the pin that connects the bucket and the arm, the pin that connects the first link and the arm, and the pin that connects the links Passages are provided, these greasing passages are connected to a greasing device incorporated in the shovel, and the greasing device can be automatically operated by operating the greasing device. However, under the present circumstances, the lubrication of the pin connecting the second link and the bucket in the link mechanism is performed by the operator manually relubrication each time.

SUMMARY OF THE INVENTION The present invention provides an improved lubrication system in which all link and pin contact surfaces can be lubricated by a greasing device built into the construction machine.

[Means for Solving the Problems]

In order to achieve the above object, the present invention provides an arm constituting a front, a first link connected to the arm by a pin, and a second link connected to the first link by a pin. A bucket connected to the arm and the second link by a pin, respectively, and a hydraulic cylinder connected to the case and the pin to connect the rod to the first link and the second link. In the construction machine, a pipe from a greasing device incorporated in the construction machine is connected to a bearing of a pin connecting the first link and the second link, and at both ends of the second link, A greasing passage connected to a bearing of a pin coupled to one link and a greasing passage connected to a bearing of a pin coupled to the bucket are provided, and the side surface of the second link is provided with the above One of the features that it has secured disposed tubular member connecting the lubrication passage.

[Action]

Since the lubricating device of the present invention is configured as described above,
When you operate the greasing device built into the construction machine,
The grease is supplied to the bearing of the pin that connects the first link and the second link, and the greasing passage connected to the bearing of the pin that is connected to the first link and the side surface of the second link. Grease can be supplied to the bearing of the pin connecting the bucket and the link via the arranged pipe member and the greasing passage connected to the bearing of the pin connecting to the bucket. Moreover, the greasing route can be performed by simple and easy processing.

〔Example〕

An embodiment of the lubricating device of the present invention will be described below with reference to the accompanying drawings.

In FIG. 1, reference numeral 11 is an arm forming the front of the shovel, 12 is a bucket, 13 is a hydraulic cylinder for rotating the bucket, and 14 and 15 are arms,
Figure 3 shows first and second links respectively connected by pins to the bucket and rods of the hydraulic cylinder.

The arm 11 is composed of a closed cross-section member obtained by welding and assembling plate materials. Pins 16 and 17 are attached to the side wall of the arm. The pins 16 and 17 are arranged so as to penetrate through both side walls of the arm and are held by bearings on the side wall of the arm.

The bucket 12 has a known structure. As will be described later, the support plate 18 on the back surface of the bucket body is directly connected to the arm 11 by the pin 16, and the arms 14 are connected via the links 14 and 15. It is connected to 11.

As shown in FIG. 2, the links 14 and 15 have other links 14 'and 15' having the same structure. The links 14 and 15 are arranged on the front side of the arm 11, and the links 14 'and 15' are arranged on the rear side of the arm. The links 14 and 14 'are plate-shaped and are arranged in parallel to both side surfaces of the arm 11, one end of which is fitted to the pin 17 of the arm 11 and fixed to the pin 17. The links 15, 15 'consist of a welded assembly. Bearings 21 and 22 are press-fitted into the pin holes at both ends of the link 15, and bearings 21 'and 22' are press-fitted into the pin holes of the link 15 '. These links are links 15, 15 '
Are arranged in parallel inside the links 14 and 14 ', and
By inserting the pin 24 into the bearings 21 and 21 ',
It is connected to each other.

The support plate 18 is attached to the back surface of the bucket 12 as described above. Another support plate 18 'having the same structure is attached to the back surface of the bucket at a distance from the support plate 18. The bucket is arranged such that the support plates 18, 18 'are located outside the arms 11 and the links 15, 15' to fit and secure each of the support plates to the pins 16 and the bearings on the support plates. 25,25 '
It is attached to the arm by inserting the pin 26 into the bearings 22 and 22 'on the links 15 and 15'.

In addition, the hydraulic cylinder 13 has an end (not shown) of the case connected to the arm 11 by a pin,
A rod 28 is arranged inside the links 15 and 15 ', and a pin 24 is inserted into a bearing 29 on the rod.

In the present invention, not only the pins 16, 17 and 24 but also the pin 26 can be greased by a greasing device incorporated in the shovel.

In the greasing device, only the distributor 31, the pipe 32 connecting the grease pump and the distributor, and the pipes 33, 34, 35 connecting the distributor and the pins are shown in FIG. The distributor 31 is fixed to the arm 11. Among the pipes, the pipes 33 and 34 are fixed pipes, and the pipe 35 is a flexible pipe. Another set of these is also disposed on the opposite side of the arm and will be described with a reference numeral followed by a dash as with links and the like.

Although not shown, the pin 16 connecting the arm 11 and the bucket 12 is provided with a greasing passage having openings at both end faces of the pin and a contact face for bearings on the arm. , 33 'are connected to the openings on the pin end face side in the greasing passage. Similarly, the pin 17 connecting the arm 11 and the links 14, 14 ′ is provided with a greasing passage having openings in both end surfaces of the pin and a contact surface for bearings on the arm, and the pipes 34, 34 ′ Is connected to the opening on the pin end face side of these greasing passages.

As shown in FIG. 2, the pin 24 connecting the links 14 and 14 ′ to the links 15 and 15 ′ has openings in the pin end surface and the contact surface with the bearing 21, and the greasing passages 36 and 3 have openings.
6'is provided. Flexible piping 35,3
5'is connected to the openings on the pin end face side in these greasing passages.

The ends of the links 15, 15 'connected to the links 14, 14' are provided with greasing passages 37, 37 'having openings in the side surfaces of the links and the contact surfaces for the bearings 21, 21', and The greasing passages 38, 38 'having openings in the side surfaces of the links and the contact surfaces for the bearings 22, 22' are provided on the end portions connected to each other. Link 15,
Pipes 39, 39 'are fixed to the side surfaces of 15', both ends of the fixed pipe 39 are the link side openings of the greasing passages 37, 38, and both ends of the fixed pipe 39 'are the greasing passages 37', 3 '.
8'are respectively connected to the link side surface openings.

Further, as shown in the enlarged view of FIG. 3, a recess 41 is provided on the peripheral surface of the pin 24 in a portion in contact with the bearing 21, and the bearing and the greasing passages 36 and 37 are connected to the bearing 21. A hole 42 is formed, and oil seals 43, 44 are arranged at both ends of the bearing 21. These oil seals have a plurality of lips, for example two, so that they can withstand the high grease pressure supplied thereto. The bearing 21 'that holds the pin 24 is similarly configured. The pin 26 also has a recess, and the bearings 22 and 22 'also have greasing passages 38,
The oil seals 45, 45 'are provided with a lip, although they are provided with holes for connection to 38'.

The grease from the distributor is fixed pipes 33, 33 'and 3
The pins 16 and 1 connecting the arm 11 and the bucket 12 and the link 15 and the arm 11 through 4, 34 '.
It is possible to enter the greasing passage from the end surface of 7 and supply it to the contact surface between the pins 16 and 17 and the bearing on the arm holding them. At the same time, the grease discharged from the distributor 31
Through the pipes 35, 35 ', the greasing passage 36 of the pin 24,
36 'and can be supplied to the contact surface between the bearings 21 and 21' and the pin 24, passing through the recess 41 in the pin 24, the hole in the bearings 21 and 21 'and the greasing passages 37 and 37'. Enters the fixed pipes 39, 39 'on the side of the link, and is led to the greasing passages 38, 38' via these,
The holes in the bearings 22 and 22 'and the recesses in the pins 26 can be inserted into the contact surfaces between the bearings 22 and 22' and the pins 26.

In this lubricating device, as shown by a chain line in FIG. 2, the pin 24 connecting the links 14 and 14 'to the links 15 and 15' is connected to both or one of the greasing passages 36 and 36 'and the hydraulic cylinder. It is also possible to provide a greasing passage 46, which is connected to the contact surface of the rod 28 on the bearing 29, so that this part can be greased at the same time.

The greasing passage according to the present invention includes the link 14 and the link 1.
5, a greasing passage 37, 37 'for the pin 24 connecting
And a pipe 39 for connecting the greasing passages 38, 38 'to the pin 26 connecting the link 15 and the bucket 12 and the openings located on the side surfaces of the link in these holes.
39 ', the greasing passage can be easily processed.

〔The invention's effect〕

As described above, the lubrication apparatus of the present invention can lubricate all of the link mechanisms that control the movement of the bucket during lubrication with the lubrication apparatus incorporated in the construction machine. Since there is no need for manual greasing as described above, there is an effect that the inspection work can be performed easily and quickly, and the greasing passage can be easily processed.

[Brief description of drawings]

The drawings show an embodiment of the lubrication apparatus of the present invention.
The figure is a side view of the tip of the arm, FIG. 2 is an enlarged cross-sectional view of a main part taken along line II-II of FIG. 1, and FIG. 3 is an enlarged cross-sectional view of a part of FIG.

Claims (1)

[Claims] 1. An arm constituting a front, a first link connected to the arm by a pin, a second link connected to the first link by a pin, an arm and a second link. A construction machine comprising a bucket connected to each of the links by a pin, and a hydraulic cylinder connected to a pin connecting the case to the arm and connecting the rod to the first link and the second link,
The pipe from the greasing device incorporated in the construction machine is connected to the bearing of the pin that connects the first link and the second link, and both ends of the second link are connected with the first link. A greasing passage connected to the bearing of the connecting pin,
A pin connecting to the bucket and a greasing passage connected to the bearing, and a pipe member connecting the two greasing passages to the side surface of the second link. Lubrication device for links that connect buckets and arms in construction machinery.