JPS5830773Y2 - Dust seal device for endless track belt - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a dust seal device for a track belt.

A conventional dust seal device for a track band is explained with reference to Fig. 1.2.3. In Figs. 1 and 2, a indicates a large number of plates constituting the track band, and b indicates two plates fixed to each plate a. bl is one end of the same link b, b2 is the same link b
The other end, C, is each end b1 of the link b of the adjacent plate a. b
2 is inserted into the pushbutton, d is the same pushbutton C and link b
When the above-mentioned endless track belt is sidetracked and a bulldozer or power shovel runs, the above-mentioned bushing C and the above-mentioned pin d are connected, although not continuously, by the link connecting pin fitted into the one end b1. They also rotate and slide relative to each other, although mainly in one direction.

At this time, sealing between the bushing C and the pin d from the outside is done by the crown washer-shaped sealing members e and f shown in FIG. The inner circumferential edge of the seal member f and the outer circumferential edge of each of the seal members e and f are in contact with the end surface of the bushing C and the inner hole surface of one end b1 of the link b with strong surface pressure. Even if it runs on sandy muddy ground, etc., the seal members e and f will slide as the bush C and pin d rotate relative to each other, and the link ends b1. Intrusion from between b2 to between bush e and pin d is prevented.

The dust seal device for the endless track belt must be installed between the seal member e, one end b1 of the fffi link b, and the bushing C when connecting the links b. It is difficult to set the surface pressure to a predetermined value, and if it becomes excessive, the seal members e and f'i will wear out prematurely.

Moreover, there is no seal member e s f L/ between one end b1 of the link b and the bushing C, and the seal member is worn out or damaged for other reasons, resulting in a gap in the part that should be sealed. When this occurs, there is a defect that muddy water G or the like immediately enters between the ends b1 and b2 of the link bb and between the bushing C and the pin d, damaging these parts c and d.

The parts to be sealed are the sealing member e and the bushing C.
S21 between seal members e and f, and S1' between seal member f and end b1 of link b, each of which has sliding movement that is a severe condition for a seal, and all of these parts satisfy the seal metal. Without it, the sealing effect cannot be achieved.

In addition, the conventional sealing mechanism seals with a sealing surface, and
The sealing surface also receives thrust force.

Therefore, since the sealing surface receives the thrust force directly, a considerable extra force (more than 200 kg of thrust force) is applied to the sealing surface compared to the force required to seal the muddy water (5 to 6 kg is enough). The problem was that the seal surface became severely worn and the seal surface became rough, impairing the sealing effect.

Furthermore, as shown in Fig. 4, in order to further reduce the wear of pin d and bushing C, as well as to reduce the contact noise generated between the pin and bushing, and to move towards lower noise, we will improve the oil passage hole in the pin. It has been considered to supply lubricating oil between the pin and the bush through the hole t, but with conventional lubricating oil seals, it is difficult to take into account the above-mentioned problems.

The present invention eliminates the above drawbacks, separates the member receiving the sealing action and the thrust, reduces the excess thrust force applied to the sealing part, prevents wear of the sealing member as much as possible, and prevents the sealing action from occurring between the ends of the link. It is an object of the present invention to provide a dust seal device for a track belt which has a high sealing effect and completely prevents muddy water from entering between the bushing and the pin.

The feature of this invention is that the sealing action and the member receiving the thrust force are separate, and the sealing member is made of an elastic body such as resin or rubber in the shape of a fishhook, and the sealing surface is formed by the elastic force. However, a resin or metal with good wear resistance and friction characteristics is embedded and bonded only on one side of the seal member (lower height), and the seal member slides against the end surface of the bushing to perform a dynamic seal.

However, the other side is made of only an elastic body, and when the seal member is compressed and set, it comes into pressure contact with the pin button and the end face of the link, and seals the stationary part.

Therefore, there is only one moving seal portion, which increases the sealing effect.

The member that receives large thrusts is made of compressive strength and wear-resistant resin and metal, and has a concave shape on the inner circumference, and is fitted and bonded to prevent the protrusion of the seal member from coming off. be done.

Setting the dust cooler made of such a member makes positioning easy by press-fitting the link with the width 1 of the member that receives the thrust, and has excellent effects in terms of maintenance.

Embodiments of the present invention will be described in detail below with reference to the drawings.

Fig. 5 shows the state in which the dust seal of the present invention is positioned on the link 1, the pin 2 with the lubricating oil passage 2a formed inside, and the bush 3, and Fig. 6 shows the state in which the dust seal of the present invention is press-fitted into the gold pin 2 of the link 1 and the seal is installed. Shows the presser foot setting.

This dust seal is shaped like a stick and has a sealing member 4 made of elastic crosswind rubber, etc., and a sealing ring 5 that is fitted into the sealing member 4 and fixed by adhesive or the like and makes sliding contact with the end surface 3a of the bushing 3 for sealing, and a thrust force. The spacer 6 is made of resin, metal, etc. and has high wear resistance and compression strength.

The spacer 6 loosely fitted to the inner surface of the link has a concave portion 6ak between its inner peripheries, and a top portion 4c'j formed into a convex portion by the sealing member 4.
It is fitted into the r recess 6a and integrally forms a dust seal, and the oil sent from the lubricating oil passage 2a formed in the pin 2 or the sealed oil is used as lubricating oil between the earth and sand intrusion button, the pin 2, and the bushing 3 to the outside. Seal to prevent leakage.

The sealing member 4 is tightened with an appropriate tightening force, that is, in a state shown in FIG.
b, the end surface 1a which is the inner hole of the link, and the pin outer peripheral surface 2
The seal member 4 is pressed against b so that the surface pressure can be maintained.
The width H [of the spacer 6 is 1.2-1.5 with respect to the width H2 of the spacer 6.
Formed twice.

Further, the first arm portion 4a of the sealing member 4 that contacts the bushing 3 has a height Lxi that does not contact the pin outer circumferential surface 2b when set, and the second arm portion 4b that contacts the link end 1a has a height Lxi when set. , is set at a height L2 that allows the pin to be pressed against the outer peripheral surface 2b of the pin with an appropriate surface pressure.

In this way, the diameter of the second arm portion is smaller than the diameter of the first arm portion.

Therefore, when set, it will be as shown in Figure 6,
The rotary seal surface S1 and stationary seal surfaces S2 and 83 are formed to seal while sliding, completely sealing muddy water entering from the outside.

Note that the sealing surface S1 is affected by the elastic force of the sealing member 4 and the pin 2.
, the lubricating oil pressure P supplied between the bushings 3 acts, and a force F = P - A + Ps (Ps: elastic force) multiplied by the action area A acts, and the self-tightening effect of the oil pressure changes depending on the magnitude of the oil pressure force. While holding and obtaining appropriate surface pressure, seal the muddy water from the outside and complete the seal to prevent lubricating oil from leaking to the outside.

Next, the function and effect of the dust seal device configured as described above will be explained.
The thrust force is received by the seal member 4, which is made of an elastic body fitted into the recess 6a of the spacer 6, and performs a sealing action, thereby reducing the excessive thrust force applied to the seal portion and preventing wear of the seal member as much as possible.

Moreover, the abrasion-resistant seal ring 5 fitted to the seal member 4 also reduces wear caused by contact sliding.

First, the height LIL2 of the first arm portion 4a that contacts the bush 3 of the sealing member 4 and the second arm portion 4b that contacts the link 1 are different, so that the first arm 4a moves relative to the bush 3. The second arm 4b contacts only the end surface 3a and forms a sealing surface S1e, and the second arm 4b contacts the pin outer peripheral hole surface 2b.
and is pressed against the link end face 1a with an appropriate surface pressure to form a sealing surface S2S3.

Therefore, the surface pressure of the moving seal surface 52S3 is pressed against the link on two surfaces, and the friction coefficient of S2183 is the seal ring 5 fixed to the first arm 4a, which has a low friction coefficient.
Since the seal surface 52S3 is higher than the seal surface S1 having raise money.

Further, by forming the sealing member as a member having elastic force and making the width H1 of the sealing member 1.2 to 1.5 times the width H2 of the spacer, an appropriate pressing force can be obtained.

The setting is made by press-fitting the link metal with the width H21 of the spacer, which is a member for connecting the thrust metal pipe, to facilitate positioning and to have an excellent effect on maintenance.

Furthermore, the seal member is constructed in the shape of a stick, and its elastic force forms a sealing surface, and the force pressed against the sealing surface is suppressed by the self-tightening effect of the lubricating oil pressure that acts as a lubricating oil between the pin and bushing, so that the sealing surface can be properly adjusted. This prevents muddy water from entering between the pins and bushings, reduces noise, and prevents lubricating oil from leaking out to extend the life of the pins and bushings.

Another embodiment of the present invention is shown in FIG. 7, and FIG. 8 shows the state after setting.

In contrast to FIG. 5 explained in the above embodiment, in order to apply a sealing action to the spacer 6 of the member, the thrust metal receiver has an elastic force at a position opposite to the end surface of the bushing 3 on the sliding side, and has wear resistance. A synthetic rubber, resin, etc. with good frictional properties is bonded and integrally molded to prevent muddy water from directly acting on the rotating seal surface Sl.

-It is effective as the next muddy water seal.

As described above, according to the present invention, the pin has a lubricating oil passage formed inside, the spacer is fitted loosely into the inner surface of the link and has a recess between the inner peripheries, and the first arm has a diameter that is smaller than that of the first arm. and a highly wear-resistant seal ring fixed to the first arm, and a sealing member made of an elastic body whose top part is fitted into the recess, and the spacer interposed between the seal ring and the inner hole of the link, the seal ring is brought into contact with the end surface of the bush, and the second arm is brought into contact with the pin and the inner hole surface of the link, respectively, by the elastic force of the seal member;
By supplying lubricating oil from within the pin into the recess formed by each arm of the seal member, the following effects are achieved.

Since the member receiving the sealing action and thrust is separated from the sealing member and the spacing, the excess thrust force applied to the sealing portion is reduced and wear of the sealing member is prevented as much as possible.

Further, by providing a seal ring made of a wear-resistant material and fixed to the first arm portion of the seal member, wear caused by contact sliding is reduced.

Since the sealing member is made of an elastic material, an appropriate pressing force can be obtained, and the pressing force is preferably set so that the width of the sealing member is 1.2 to 1.5 times the width of the spacer.

The sealing member is made of an elastic body such as resin or rubber in the shape of a stick, and the elastic force forms the sealing surface, and the force that presses the sealing surface is provided by lubricating oil pressure between the pins and bushes.
Uses elastic force to maintain appropriate sealing surface pressure, preventing muddy water from entering between the pin and bush and lubricating oil leaking.

A sealing member has a first arm and a second arm with a dog-shaped diameter.
Only the first arm side to which the seal ring metal is fixed acts as a moving sealing surface, and the second arm side is not a moving sealing surface, so the moving sealing surface can be performed at only one location, improving the reliability of the sealing effect. .

Furthermore, the setting of this dust seal is facilitated by press-fitting the link into the spacer, which is a thrust metal fitting member, with a width of 1, which makes positioning easy and has an excellent effect on maintenance.

[Brief explanation of drawings]

Fig. 1 is a perspective view schematically showing a conventional dust seal device for endless track belts, Fig. 2 is a cross-sectional plan view taken along the arrow [-[ line in Fig. 1], and Fig. 3 is an enlarged view of the arrow ■ section in Fig. 2. FIG. 4 is a cross-sectional plan view when a lubricating oil passage is formed in a conventional device; FIG. 5 is a cross-sectional plan view showing an embodiment of the dust seal device for a track belt according to the present invention; FIG. 7 is a cross-sectional plan view showing the setting state, FIG. 7 is a cross-sectional plan view showing the second embodiment, and FIG. 8 is a cross-sectional plan view showing the setting state. 1...Link, 1a...Inner hole end surface of link, 2...
・Pin, 2a... Lubricating oil path, 3... Bush 3a
...Link end face, 4...Seal member, 4a...First arm, 4b...Second arm, 5...Seal ring, 6...Spacer, 6a...Recess.

Claims (1)

[Scope of utility model registration request] It has a pin with a lubricating oil passage formed inside, a spacer that is loosely fitted into the inner surface of the link and has a recess formed on the inner circumferential surface, a first arm and a second arm having a diameter smaller than that of the first arm, consisting of a seal member made of an elastic body whose top part is fitted into the recess, and a seal ring fixed to the first arm,
The spacer is interposed between the bushing and the link inner hole, the seal ring is brought into contact with the end surface of the bushing, the second arm is brought into contact with the pin and the link inner hole surface by the elastic force of the sealing member, and each arm of the sealing member makes contact with the inner hole of the link. A dust seal device for a continuous track belt, characterized in that lubricating oil is supplied from within the pin into the formed recess.