Oil seal chain

Abstract

An oil seal chain includes a plurality of inner link units, a plurality of outer link units, a chain shaft unit, and at least one oil seal ring. Each inner link unit includes two oppositely arranged inner links, each having two inner perforations and at least one inner groove with a V-shaped cross section. Each outer link unit includes two oppositely arranged outer links, each having two outer perforations and at least one outer groove with a V-shaped cross section. The at least one outer groove and the at least one inner groove of an adjacent inner link define a ring-shaped accommodating space for accommodating the at least one oil seal ring. By providing the at least one accommodating space, the friction between the oil seal ring and the inner link units and the outer link units can be reduced, and the oil seal ring can be prevented from being squeezed and deformed, thereby improving the smoothness of chain operation.

Description

Technical Field

[0001] This invention relates to a chain for transmission, and more particularly to an oil-sealed chain. Background Technology

[0002] A conventional oil-sealed chain includes a plurality of inner plate units and a plurality of outer plate units spaced apart along a transmission direction, a plurality of pins inserted between the inner plate units and the outer plate units, and a plurality of oil seal rings. The outer plate units are located outside the inner plate units. Each oil seal ring is disposed on the outer periphery of one of the pins and is sandwiched therebetween by the corresponding inner plate unit and the corresponding outer plate unit, thereby sealing lubricating oil in the corresponding pin, the inner plate unit, the outer plate unit, and the oil seal ring, to achieve the effects of lubricating the chain, reducing vibration and noise, and preventing dust or rainwater from entering.

[0003] However, the oil seal chain fixes the oil seal ring by applying pressure to the inner plate unit and the outer plate unit. Therefore, there will be a large resistance between the inner plate unit, the outer plate unit and the oil seal ring, and under long-term pressure, the oil seal ring is prone to deformation or damage. Summary of the Invention

[0004] The object of the present invention is to provide an oil seal chain that can at least overcome the disadvantages of the prior art.

[0005] The oil seal chain of the present invention comprises multiple inner chain piece units, multiple outer chain piece units, a chain shaft unit, and at least one oil seal ring.

[0006] The inner chain plate units are arranged at intervals along a running direction. Each inner chain plate unit includes two opposing inner plates. Each inner plate has two inner holes and is provided with at least one inner groove surrounding one of the inner holes and located on the outer side of the inner plate. The cross-section of the at least one inner groove is V-shaped.

[0007] The outer chain plate units are arranged at intervals along the direction of operation. Each outer chain plate unit is located outside two adjacent inner chain plate units and includes two oppositely arranged outer plates. Each outer plate has two external perforations and is provided with at least one external groove surrounding one of the external perforations and located on the inner side of the outer plate. The cross-section of the at least one external groove is V-shaped and together with the at least one internal groove of the adjacent inner plate, they define an annular accommodating space.

[0008] The chain shaft unit has multiple pins passing through the inner holes of the inner sheet and the outer holes of the outer sheet. At least one oil seal ring is disposed in the at least one accommodating space and surrounds the corresponding pin.

[0009] Further, the at least one inner groove has a first inner bevel and a second inner bevel corresponding to each other, the first inner bevel and the second inner bevel are clamped at an inner included angle, the inner included angle is between 90° and 170°, the at least one outer groove has a first outer bevel and a second outer bevel corresponding to each other, the first outer bevel and the second outer bevel are clamped at an outer included angle, the outer included angle is between 90° and 170°.

[0010] Further, the inner included angle is between 120° and 146°, and the outer included angle is between 120° and 146°.

[0011] Further, the cross section of the at least one oil seal ring is circular, and is in contact with the first inner bevel and the second inner bevel corresponding to the inner groove, and the first outer bevel and the second outer bevel corresponding to the outer groove.

[0012] Further, the junction of the first inner bevel and the second inner bevel corresponding to the inner groove forms an inner top corner, the junction of the first outer bevel and the second outer bevel corresponding to the outer groove forms an outer top corner, and the oil seal ring arranged in the corresponding accommodation space does not contact the inner top corner and the outer top corner.

[0013] Further, the cross section of each inner top corner and each outer top corner is rounded.

[0014] Further, the cross section of each inner top corner and each outer top corner is sharp.

[0015] Further, the depth of the at least one inner groove is 10% to 25% of the thickness of each inner piece, and the depth of the at least one outer groove is 10% to 25% of the thickness of each outer piece.

[0016] Further, the depth of the at least one inner groove is 13% to 21.5% of the thickness of each inner piece, and the depth of the at least one outer groove is 13% to 21.5% of the thickness of each outer piece.

[0017] Further, the sprocket unit further comprises a plurality of bushings arranged on the outer periphery of the pin shaft, and each bushing is fixed in the inner perforation of two oppositely arranged inner pieces, and the at least one oil seal ring surrounds the outer periphery of the bushing.

[0018] The effect of the present application is that by arranging the at least one oil seal ring in the at least one accommodation space, not only can the friction between the oil seal ring and the inner chain piece unit and the outer chain piece unit be reduced, and the oil seal ring can be prevented from being extruded to deform, but also the space for accommodating lubricating oil can be increased, so as to improve the smoothness of the chain operation. BRIEF DESCRIPTION OF DRAWINGS

[0019] Other features and effects of the present application will be clearly presented in the embodiments with reference to the drawings.

[0020] Figure 1 is a sectional view of an embodiment of the oil seal chain of the present application;

[0021] Figure 2 is a perspective view of an inner plate of the embodiment;

[0022] Figure 3 is a perspective view of an outer plate of the embodiment;

[0023] Figure 4 is a partial enlarged view of the embodiment, illustrating a ring-shaped accommodating space of the embodiment; and Figure 2

[0024] Figure 5 is another implementation of the ring-shaped accommodating space of the embodiment. DETAILED DESCRIPTION

[0025] Referring to Figures 1-4 , an embodiment of the oil seal chain of the present application comprises a plurality of inner chain plate units 2, a plurality of outer chain plate units 3, a chain shaft unit 4, and a plurality of oil seal rings 5.

[0026] The inner chain plate units 2 are arranged at intervals along a running direction R, and each inner chain plate unit 2 comprises two oppositely arranged inner plates 21. Each inner plate 21 has two inner perforations 201, and is provided with two inner grooves 202 respectively surrounding the inner perforations 201 and located on the outer side surface 215 of the inner plate 21, the depth of the inner grooves 202 being 10% to 25% of the thickness of the inner plate 21. Preferably, the depth of the inner grooves 202 is 13% to 21.5% of the thickness of the inner plate 21. Each inner groove 202 has a V-shaped cross section, and has a first inner inclined surface 211 and a second inner inclined surface 212, the junction of the first inner inclined surface 211 and the second inner inclined surface 212 forming an inner top corner portion 214, the cross section of the inner top corner portion 214 being a sharp corner. The first inner inclined surface 211 and the second inner inclined surface 212 form an inner included angle 213 therebetween, the inner included angle 213 being 90° to 170°. Preferably, the inner included angle 213 is 120° to 146°.

[0027] ​The outer link plate units 3 are arranged at intervals along the running direction R, and each outer link plate unit 3 comprises two oppositely arranged outer plates 31. Each outer plate 31 has two outer holes 301, and is provided with two outer grooves 302 respectively surrounding the outer holes 301 and located at the inner side 315 of the outer plate 31, the depth of the outer grooves 302 being 10% to 25% of the thickness of the outer plate 31. Preferably, the depth of the outer grooves 302 is 13% to 21.5% of the thickness of the outer plate 31. The cross section of each inner groove 202 is V-shaped, and has a first outer inclined surface 311 and a second outer inclined surface 312, the junction of the first outer inclined surface 311 and the second outer inclined surface 312 forming an outer top corner 314, the cross section of the outer top corner 314 being a sharp corner. The first outer inclined surface 311 and the second outer inclined surface 312 form an outer included angle 313 therebetween, the outer included angle 313 being 90° to 170°. Preferably, the outer included angle 313 is 120° to 146°.

[0028] Each outer groove 302 of each outer plate 31 and one of the inner grooves 202 of the adjacent inner plate 21 jointly define a ring-shaped containing space 101, the containing space 101 being used to contain the oil seal ring 5. Each oil seal ring 5 is in fit contact with the first inner inclined surface 211 and the second inner inclined surface 212 forming the corresponding inner groove 202, and does not contact the corresponding inner top corner 214. Each oil seal ring 5 is in fit contact with the first outer inclined surface 311 and the second outer inclined surface 312 forming the corresponding outer groove 302, and does not contact the corresponding outer top corner 314. The fit contact means that each oil seal ring 5 is in fit contact with the first inner inclined surface 211 and the second inner inclined surface 212 forming the corresponding inner groove 202, and the first outer inclined surface 311 and the second outer inclined surface 312 forming the corresponding outer groove 302.

[0029] The chain shaft unit 4 comprises a plurality of pin shafts 41, a plurality of bushings 42, and a plurality of rollers 43. The pin shafts 41 are rotatably provided in the inner holes 201 of the inner plates 21, and are tightly fitted and fixed to the outer holes 301 of the outer plates 31. The bushings 42 are respectively arranged at the outer periphery of the pin shafts 41, and are fixed in the inner holes 201 of the two oppositely arranged inner plates 21, and the rollers 43 are respectively sleeved at the outer periphery of the bushings 42, and are located between the two oppositely arranged inner plates 21.

[0030] Each oil seal ring 5 surrounds the outer periphery of the corresponding bushing 42 and defines an oil seal space 102 with the corresponding bushing 42, the pin shaft 41, and the outer plate 31 for accommodating lubricating oil (not shown in the figure). Under the action of the oil seal ring 5, the lubricating oil can be confined between the inner plate 21 and the outer plate 31, and between the pin shaft 41 and the bushing 42, and cannot leak out. By arranging the oil seal ring 5 in the ring-shaped accommodating space 101 respectively, and allowing the oil seal ring 5 to be in contact with the inner plate 21 and the outer plate 31 without contacting the inner top corner portion 214 and the outer top corner portion 314, not only can the friction between the oil seal ring 5 and the inner chain plate unit 2 and the outer chain plate unit 3 be reduced, and the oil seal ring 5 can be prevented from being extruded and deformed, but also the oil seal space 102 for accommodating the lubricating oil can be increased, so as to improve the smoothness of the chain operation.

[0031] It should be noted that the cross section of each inner top corner portion 214 and the cross section of each outer top corner portion 314 are sharp corners in the embodiment, but in other embodiments of the application, this is not limited, as long as the oil seal ring 5 does not contact the inner top corner portion 214 and the outer top corner portion 314, see Figure 5 , for example, the cross section of each inner top corner portion 214 and the cross section of each outer top corner portion 314 are rounded corners.

[0032] In the embodiment, each inner plate 21 is provided with two inner grooves 202 respectively surrounding the inner perforations 201, and each outer plate 31 is provided with two outer grooves 302 respectively surrounding the outer perforations 301, but in other embodiments of the application, this is not limited, for example, each inner plate 21 can also be provided with only one inner groove 202 surrounding one of the inner perforations 201, or each outer plate 31 can also be provided with only one outer groove 302 surrounding one of the outer perforations 301.

[0033] In summary, the oil seal chain can confine the lubricating oil between the inner plate 21 and the outer plate 31 without leaking out by arranging the oil seal ring 5 in the ring-shaped accommodating space 101 respectively, and allowing the oil seal ring 5 to be in contact with the inner plate 21 and the outer plate 31 without contacting the inner top corner portion 214 and the outer top corner portion 314, not only can the friction during the operation of the chain be reduced, but also the oil seal ring 5 can be prevented from being extruded and deformed, and the oil seal space 102 for accommodating the lubricating oil can be increased, which is an oil seal chain with multiple advantages.

[0034] The above is only an embodiment of the application, which cannot limit the scope of the application, and any simple equivalent changes and modifications made according to the scope and content of the patent application and the patent specification are still within the scope of the application.

Claims

1. An oil seal chain characterized by, The chain comprises: a plurality of inner link plate units arranged in series along a running direction, each of the inner link plate units comprising two oppositely arranged inner plates, each of the inner plates having two inner holes and being provided with at least one inner groove encircling one of the inner holes and located on an outer side surface of the inner plate, the at least one inner groove having a V-shaped cross section; a plurality of outer link plate units arranged in series along the running direction, each of the outer link plate units being arranged on outer side surfaces of two adjacent inner link plate units and comprising two oppositely arranged outer plates, each of the outer plates having two outer holes and being provided with at least one outer groove encircling one of the outer holes and located on an inner side surface of the outer plate, the at least one outer groove having a V-shaped cross section and jointly defining a ring-shaped accommodating space with the at least one inner groove of the adjacent inner plate; a plurality of pin shafts arranged through the inner holes of the inner plates and the outer holes of the outer plates; and at least one oil seal ring arranged in the accommodating space and encircling an outer periphery of the corresponding pin shaft, the at least one inner groove has a first inner inclined surface and a second inner inclined surface corresponding thereto, the first inner inclined surface and the second inner inclined surface are arranged to form an inner included angle therebetween, the inner included angle is between 90° and 170°, the at least one outer groove has a first outer inclined surface and a second outer inclined surface corresponding thereto, the first outer inclined surface and the second outer inclined surface are arranged to form an outer included angle therebetween, the outer included angle is between 90° and 170°, a cross section of the at least one oil seal ring is circular and is in abutting contact with the first inner inclined surface and the second inner inclined surface of the corresponding inner groove and the first outer inclined surface and the second outer inclined surface of the corresponding outer groove, an inner top corner is formed at a joint of the first inner inclined surface and the second inner inclined surface of the corresponding inner groove, an outer top corner is formed at a joint of the first outer inclined surface and the second outer inclined surface of the corresponding outer groove, and the oil seal ring arranged in the corresponding accommodating space does not contact the inner top corner and the outer top corner.

2. The oil-encapsulating chain of claim 1, wherein, The inner included angle is between 120° and 146°, and the outer included angle is between 120° and 146°.

3. The oil-encapsulating chain of claim 1, wherein, Each of the inner top corner and the outer top corner has a rounded corner in a cross section.

4. The oil-encapsulating chain of claim 1, wherein Each of the inner top corner and the outer top corner has a sharp corner in a cross section.

5. The oil-encapsulating chain of claim 1, wherein A depth of the at least one inner groove is 10% to 25% of a thickness of each of the inner plates, and a depth of the at least one outer groove is 10% to 25% of a thickness of each of the outer plates.

6. The oil-encapsulating chain of claim 5, wherein, The depth of the at least one inner groove is 13% to 21.5% of the thickness of each of the inner plates, and the depth of the at least one outer groove is 13% to 21.5% of the thickness of each of the outer plates.

7. The oil-encapsulating chain of claim 1, wherein The chain shaft unit further comprises a plurality of bushings arranged on outer peripheries of the pin shafts respectively, each of the bushings is fixed in the inner holes of two oppositely arranged inner plates, and the at least one oil seal ring encircles an outer periphery of the bushing.

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