JP3048309U - Ultra-thin seal for chains - Google Patents

Abstract

(57) [Summary] [Problem] To provide an ultra-thin seal for a chain using a lightweight and thin seal chain that does not cause settling. SOLUTION: At the inner peripheral side portion 1a facing the bushing position of a flat ring-shaped seal main body 1, a concave portion 4 is formed at the base portion thereof along the protruding portion shape of a bush 3 protruding from an inner plate surface at the base thereof. The inner plate 2 and the outer plate 11 at a narrow interval are
The oil lip portion 5 and the dust lip portion 6 which are crushed by the protrusion are provided on both sides to make the seal crushing uniform.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to an ultra-thin seal for chains used in motorcycle chains and the like, for which light weight and small size are required.

[0002]

[Prior art]

 Generally, in a motorcycle chain requiring severe operation such as a motorcycle race, a light and thin seal chain with a small span is emerging in view of a problem of sound and a problem of weight. In this case, the ultra-thin seal of the conventional seal chain configuration is, for example, a simple flat ring-shaped seal a in the current product as shown in FIGS. 7A and 7B, for example. The seal a is interposed in the seal gap d formed between the inner plate (roller link plate) b and the outer plate (pin link plate) c, and the seal a is crushed with a predetermined compression and impregnated between the bush e and the pin f. A configuration in which the grease g is sealed is known.

[0003] However, in this type of lightweight and thin seal chain, the seal gap d between the inner plate b and the outer plate c with the seal a interposed therebetween is about 2 mm in a normal standard chain, and is about 0.6 mm. The position of the bush e with respect to the inner plate b is set so that the tip of the bush protrudes slightly from the plate surface of the inner plate b due to the prevention of the displacement of the inner plate b and the stability of the strength. (The tip of the bush protrudes about 0.3 mm from the inner plate surface).

[0004]

[Problems to be solved by the invention]

 However, when the flat ring-shaped seal a is set in the seal gap d at a narrow interval as described above, a part of the inner peripheral side portion of the seal a necessarily projects from the inner plate surface. e 'is placed on top of e', so that it is subjected to a predetermined compression applied to the outer plate c overlying the upper surface thereof, so that the seal crushing is not uniform and the inner peripheral side part a 'of the seal a is more than necessary. This causes the so-called settling phenomenon, which causes the settling to be fast in long-term use, leaving a problem in seal durability. Further, if the seal is simply a flat ring shape (flat object), there is a problem in dust prevention.

Further, as a type for reducing the settling, the inner peripheral side portion a ′ of the flat link is reduced to an acute end shape (V-shaped section) h to reduce the compression portion, and the outer peripheral side portion has a slightly concave portion j. A grease reservoir is also considered to be provided (see FIGS. 8A and 8B). In this way, even when the inner peripheral end is a V-shaped portion, the bush a is provided on the protrusion e 'of the bush e. When the sharp end shape (V-shaped cross section) h runs on, it is still not evenly crushed and receives excessive compression, so it is difficult to prevent settling for a long time.

The present invention has been made in view of the above circumstances, and provides an ultra-thin seal for a chain that solves the above-mentioned problem by forming in advance a concave portion corresponding to a protruding portion protruding from an inner plate surface in a seal.

[0007]

[Means for Solving the Problems]

 The present invention relates to a lightweight and thin seal chain in which impregnated grease is sealed between the bush on which the roller is mounted and the pin at the end of the bush, and the tip of the seal is provided on the inner peripheral side of the flat ring-shaped seal body facing the bush position. A concave portion is formed at the base of the bush so as to protrude from the inner plate surface in accordance with the shape of the bushing. The outer peripheral portion of the seal body connected to the concave portion has an inner plate and an outer plate at a narrow interval. An oil lip portion and a dust lip portion which are crushed by a plate are sequentially provided on both surfaces.

Further, in a light and thin seal chain in which impregnated grease is sealed between a bush on which a roller is mounted and a pin at a bush end, a thick seal tip is provided on an inner peripheral portion facing a bush position of a flat ring-shaped seal body. At the base, a recess is formed along the shape of the projection of the bush that protrudes from the inner plate surface, and the outer peripheral side of the seal body that is continuous with the recess is crushed by the inner plate and the outer plate at a narrow interval. An oil lip portion, a dust lip portion, and a second oil lip portion in the middle thereof are sequentially provided on both surfaces.

As described above, the concave portion along the protrusion of the bush, which is located between the inner plate and the outer plate at a narrow interval and protrudes from the inner plate surface, is provided in the inner peripheral portion of the ultra-thin seal used for the light and thin seal chain. When mounting on the inner plate, the ultra-thin seal fits the bush end protruding from the inner plate surface into the recess on the inner peripheral side, and the oil lip and dust lip on the outer peripheral side Located on the inner plate surface. If a predetermined compression is applied by covering the outer plate in this state, each lip is bent and crushed to a predetermined width, but at this time, since the concave portion on the inner peripheral side faces the bush end, it does not receive more compression than necessary, The so-called settling is minimized.

[0010] Furthermore, since a thick portion is provided at the tip of the inner peripheral side portion, the thick portion abuts on the pin wall surface due to the extension of the concave portion, thereby sealing the grease outlet. Further, a grease pool is formed between the oil lip portion and the dust lip portion on the outer peripheral side by bending deformation, so that dust can be prevented from entering.

[0011]

[Embodiment of the invention]

 DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described with reference to the drawings showing an embodiment of an ultra-thin seal used for a lightweight thin seal chain in the form of a motorcycle chain.

FIGS. 1 to 3 show an embodiment of an ultra-thin seal in which two lip ridges are arranged, and 1 is a flat link-shaped seal main body formed of an elastic member made of nitrile rubber or the like. A curved concave portion 4 is formed on at least one surface (both surfaces in the drawing) of the inner peripheral side portion 1a of the cylindrical bush 3 along the outer shape of the protruding portion 3a of the cylindrical bush 3 protruding from the inner plate 2 and the concave portion. An oil lip 5 and a dust lip 6 are sequentially arranged on the upper and lower surfaces of an outer peripheral side portion 1b of the seal body 1 continuous with the seal body 4, and an oil reservoir 7 is provided between the oil lip 5 and the dust lip 6. In addition, the seal tip 1c of the inner peripheral side portion 1a is a thick portion 8 which is thicker than the thickness at the position of the concave portion 4, and an X-type (X-shaped cross section) ultra-thin seal 9 is formed by the entire structure. In this case, the seal width s of the ultra-thin seal 9 is smaller than the press-contact width t of the outer plate 11 fitted to the pin 10 inserted into the center of the bush 3, and the thickness u of the ultra-thin seal 9 is The space between the inner plate 2 fitted to the bush 3 and the outer plate 11 fitted to the pin 10 is set to be slightly larger than the narrow space to obtain a predetermined crushing allowance (for example, a crushing amount of 20 to 30%). . Reference numeral 12 denotes grease impregnated in a gap 13 formed between the bush 3 and the pin 10.

If the member of the ultra-thin seal 9 is molded with a color member such as a color rubber, it becomes a color ultra-thin seal, and even if the seal gap v between the inner plate 2 and the outer plate 11 is a narrow space, It is easy to confirm that the seal has been installed and that even if the seal is broken.

Now, the operation will be described. First, when assembling the chain, the same operation as that of a conventional ordinary chain is performed (not shown). In this case, the shape of the ultra-thin seal 9 is such that the lower ultra-thin seal 9 or the upper ultra-thin seal 9 is set with respect to the vertical position (both sides) of the bush 3 so that the workability (direction) is not limited. With a recess 4 facing both sides of the projection 3a.

Here, as shown in FIG. 3, if the ultra-thin seal 9 is set and fitted to the bush 3 through a predetermined chain assembling process, the bush receiving is placed on the inner peripheral side portion 1 a of the ultra-thin seal 9. Is provided, the recess 4 fits into the protruding portion 3a protruding from the inner plate surface of the bush 3, and the oil lip portion 5 of the outer peripheral side portion 1b and the dust lip portion are formed. 6 is placed on the inner plate 2. Thereafter, the outer plate 11 to be inserted into the pin 10 is put on the ultra-thin seal 9, and the ultra-thin seal 9 is appropriately compressed by assembling the pin 10 to be inserted into the outer plate 11. The rlip portion 5 and the dust lip portion 6 are bent and deformed by the inner and outer plates 2 and 11 to obtain a predetermined crushing amount. On the other hand, on the inner peripheral side portion 1a side, the concave portion 4 is received by the projection 3a of the bush 3, so that the inner peripheral side portion 1a is not compressed more than necessary by the concave portion. ) Extends into the space 13a above the bush and comes into pressure contact with the pin 10, thereby completely sealing the grease outlet (see the cross section in FIG. 3).

At this time, since the valleys of the oil lip 5 and the dust lip 6 of the ultra-thin seal 9 sandwiched between the inner plate 2 and the outer plate 11 form a kind of oil reservoir 7, Leakage and dust intrusion are prevented, which leads to improved seal durability.

FIGS. 4 and 5 show another embodiment of the ultra-thin seal. In this case, three lip ridges provided on the outer peripheral side are arranged. That is, a recess 4 similar to the above is formed in the inner peripheral side portion 1a of the seal body 1, and an oil lip portion 5 and a dust lip portion 6 are disposed on the upper and lower surfaces of the outer peripheral side portion 1b. The XW type ultra-thin seal 9 is formed as a whole by disposing a second oil lip portion 14.

At this time, the recess 4 of the inner peripheral side portion 1a of the ultra-thin seal 9 faces the protrusion 3a of the bush 3, basically similar to the above embodiment, so that the protrusion 3a is recessed during compression. Because of the escape at the part 4, a uniform crush is obtained as a whole. However, since the oil lip portion 5, the second oil lip portion 14, and the dust lip portion 6 are sequentially arranged on the outer peripheral side portion 1b side, the oil lip portion 5, the second oil lip portion 14, and the dust lip portion 6 are bent and deformed by the inner and outer plates 2 and 11 so that the oil lip portion 5 and the dust lip portion 11 are located in two places. An oil sump is formed. That is, the oil pool 7 and the oil pool 15 are formed at the positions of the oil lip 5, the second oil lip 14, and the intermediate valleys of the dust lip 6, so that a two-stage sealing effect is obtained.

Incidentally, the ultra-thin seal chain having the X-type and XW-type ultra-thin seals and the ultra-thin seal chain having only a flat ring-shaped ultra-thin seal according to the above two embodiments, and no seal in the standard chain form The wear resistance test data of the chain shown in FIG. 6 was as shown in the graph of FIG. However, the vertical axis is the elongation (%) and the horizontal axis is the test time. In this case, the replacement period is currently 0.5% for the seal chain, and according to this graph, without the seal, the test time reaches 0.5% elongation in about 20 hours, and the flat ring-shaped pole With the use of the thin seal, the test time reached 0.5% elongation in about 78 hours, but in the ultra-thin seal with the concave portion of the present invention, the elongation did not reach 0.5% even after 100 hours. That is, it is understood that the abrasion resistance is large.

[0020]

[Effect of the invention]

 As described above, the ultra-thin seal for a chain according to the present invention is provided with a recessed portion along the bushing protruding shape on the inner peripheral side facing the bushing position of the seal main body, and the oil lip portion is formed on the outer peripheral side of the seal main body. Since the strip portion protrudes and the seal tip of the inner peripheral side portion is a thick portion, even if the bush tip generated in the chain configuration of the light and thin seal chain protrudes from the inner plate surface, the bush protrusion is formed. The recessed part is exposed, and even if the entire ultra-thin seal is crushed at a predetermined compression, the bushing protruding part does not receive excessive compression and can be uniformly crushed without causing settling.

That is, in the ultra-thin seal of the present application type, the durability is improved by sealing by bending deformation of the lip and the friction is reduced as compared with the conventional seal and the current seal.

Improvement in seal durability due to accumulation of grease.

[0023] Since it has a shape along the protrusion of the bush, by reducing the number of compressed parts, uneven wear of the seal is prevented, and at the same time, friction is reduced.

By increasing the thickness of the seal tip, the seal enters the space formed by processing the bush and seals the grease outlet.

Of course, the XW type ultra-thin seal is basically the same as the X type ultra-thin seal, and aims at further sealing effect by increasing the number of lips by one.

Of course, if the ultra-thin seal itself of the present invention is formed of a color member (rubber member) such as orange or green, the seal gap between the inner plate and the outer plate is narrow with a lightweight thin seal chain. Even if there is, the presence of the seal can be visually recognized, and the effect of facilitating the check of the broken or missing seal can be obtained.

[Brief description of the drawings]

FIG. 1 is a partially cutaway front view showing an embodiment of a chain using an ultra-thin seal for a chain according to the present invention.

FIG. 2 is an ultra-thin seal for the chain, wherein (A) is a sectional view and (B) is an enlarged sectional view of a main part.

FIG. 3 is an explanatory view in which the ultra-thin seal for the chain is crushed.

FIG. 4 is an ultra-thin seal for a chain according to another embodiment (A).
Is a sectional view, and (B) is an enlarged sectional view of a main part.

FIG. 5 is an explanatory view in which the ultra-thin seal for the chain is crushed.

FIG. 6 is a graph showing a wear resistance test result of a seal chain using the ultra-thin seal of the present invention and a conventional chain and a conventional chain.

FIG. 7 shows a flat ring-shaped seal of an existing product,
(A) It is a side view, (B) is the explanatory view which crushed the seal.

8A and 8B show the V-type seal, and FIG. 8A is a side view and FIG. 8B is an explanatory view in which the seal is crushed.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Seal main body 1a Inner peripheral part 1b Outer peripheral part 2 Inner plate 3 Bush 3a Projection 4 Depression 5 Oil lip 6 Dust lip 7 Oil reservoir 8 Thick part 10 Pin 11 Outer plate 12 Grease

Claims (2)

[Utility model registration claims] 1. A light and thin seal chain in which impregnated grease is sealed at a bush end between a bush on which a roller is mounted and a pin, a seal tip is thickened on an inner peripheral portion facing a bush position of a flat ring-shaped seal body. The base has a recess formed along the shape of the projecting portion of the bush protruding from the inner plate surface, and an oil crushed by the inner plate and the outer plate at a narrow interval in the outer peripheral portion of the seal body that is continuous with the recess. Ultra-thin seal for chains with a lip and a dust lip protruding sequentially on both sides. 2. A light and thin seal chain in which impregnated grease is sealed at a bush end between a bush on which a roller is mounted and a pin, the seal tip is thickened on an inner peripheral portion facing the bush position of the flat ring-shaped seal body. The base has a recess formed along the shape of the projecting portion of the bush protruding from the inner plate surface, and an oil crushed by the inner plate and the outer plate at a narrow interval in the outer peripheral portion of the seal body that is continuous with the recess. An ultra-thin seal for a chain in which a lip portion, a dust lip portion, and a second oil lip portion in the middle of the lip portion are sequentially provided on both surfaces.