JPH04341664A - Sealing device - Google Patents

Abstract

PURPOSE:To keep off any possible wear between a seal ring and a counter- member by forming a groove member for installing the seal ring, forming a cooling groove and an interconnecting groove, with a ferrous member, and attaching this ferrous member to an aluminum die-casting member such as a shaft or the like by means of a press-in or inserting process. CONSTITUTION:A groove member 3 in which a ring groove 2 for installing a seal ring 1 consisting of plastics is formed by a ferrous member. This groove member 3 is attached to a counter-member 4 being formed by an aluminum die-casting base material, for example, a shaft by means of a press-in or inserting process. On the other hand, the seal ring 1 is made up of forming a ring cooling groove 9 extending in the circumferential direction of one side or both sides, while it forms an interconnecting groove extending up to the cooling groove 9 from the inner circumferential end in the radial direction. In addition, the seal ring 1 is made contact with a casing clamped to a counter- member 5 consisting of a ferrous member, for example, a power transmission shaft 6. Moreover, lubricating oil out of an oil passage 8 of the counter-member 4 is fed to a recess 7 formed in space between the ring grooves 2 and 2 of the groove member 3.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealing device, and more particularly to a resin seal ring and a structure of a seal ring groove in which side surfaces of the seal ring are improved.

0002

[Prior Art] The construction of hydraulic seal members for rotating sliding parts of rotary hydraulic equipment such as automatic transmissions for automobiles (hereinafter referred to as AT) and transmissions for construction machinery has traditionally been based on material wear and seal characteristics. From this point on, the materials for the seal ring include tetrafluoroethylene resin, carbon powder to improve wear resistance, copper powder,
It has been the mainstream to use synthetic resin filled with glass fibers, carbon fibers, etc. (hereinafter referred to as filled PTFE), and to use cast iron, steel, etc. as the mating casing material or shaft material.

[0003] However, in order to reduce the weight of the AT, resulting in lower combustion and lower rotational inertia, aluminum die-cast materials with low specific gravity are used for the mating casing material and shaft material. In this case, if filled PTFE is used as a seal ring, the sliding surface with the aluminum die-cast material will be unlubricated due to the flexibility of the seal ring material, resulting in wear of one or both of the aluminum die-cast material and the seal ring material. , the sealing function is lost. Therefore, it has been proposed to provide a lubrication groove on the side surface of the seal ring to reduce wear between the two. However, in this conventional sealing device, although the portion of the aluminum die-cast material facing the groove portion of the seal ring does not wear out, it cannot prevent wear of other portions of the aluminum die-cast material.

0004

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned conventional problems and to provide a sealing device that does not cause wear on the seal ring and the mating member.

[0005]

[Means for Solving the Problems] The present invention solves the above problem by providing a cooling groove formed on at least one side surface of a synthetic resin seal ring and penetrating in the circumferential direction, and a cooling groove extending radially from the inner peripheral side to the cooling groove. A groove for mounting a seal ring having a communication groove extending in the direction is formed of an iron-based member, and the iron-based member is mounted to the aluminum die-cast member by either press-fitting or casting. The problem was solved by a sealing device for hydraulic equipment.

[0006]

[Operation] According to the present invention, the groove member in which the annular groove for mounting the seal ring is formed is formed from a ferrous material such as cast iron or steel, and the groove member is cast or press-fitted into the aluminum base material to form the casing. Form a mating member such as a shaft. Since the seal ring is in contact with the iron-based groove member, the wear resistance of the mating member is improved, and since the base material is aluminum die-casting, weight reduction was achieved. The seal ring has a cooling groove that penetrates in the circumferential direction and a communication groove that extends in the radial direction from the inner circumferential side to the cooling groove, so it is flexible, but it is not possible to maintain a sufficiently lubricated state. be.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be explained based on the embodiments shown in the drawings.

In FIG. 1, for example, carbon powder is 25%
The groove member 3 in which the annular groove 2 for mounting the seal ring 1 made of filled PTFE resin is formed is made of iron-based material, for example, steel material (JIS SPHC material) or cast iron material. The groove member 3 is an aluminum die-casting base material (JIS
A mating member 4 made of ADC12 material, for example, in the figure, is attached to the shaft by press fitting or casting. The seal ring 1 is made of iron-based material, for example, steel (JIS S45
C material) seal mating member 5, for example, the casing 5 in the figure
come into contact with. The casing 5 is fixed to a transmission shaft 6 and rotated. A recess 7 is formed between the annular grooves 1 of the groove member 3, and an oil passage 8 formed inside the mating member 4 is formed in the recess 7.
Lubricating oil is supplied by

The seal ring 1 is formed with an annular cooling groove 8 extending in the circumferential direction on one or both side surfaces, and further has a communication groove extending radially from the inner circumferential end of the seal ring 1 to the cooling groove 8. A plurality of 9 are provided at intervals in the circumferential direction. The seal ring 1 having such a shape can be press-molded or injection-molded using a mold in which convex grooves are formed in portions corresponding to the cooling grooves 8 and the communication grooves 9.

[0010] The cut end shape of the seal ring 1 is formed into a straight abutment, and the size of the seal ring 1 can be, for example, an outer diameter of 30 mm, an inner diameter of 26 mm, and a width of 2.5 mm. The communication groove 9 is formed at a position of 28 mm with dimensions of 0.5 mm in width and 0.1 mm in depth.
Four can be provided at 0° intervals. The cut shape of seal ring 1 is not limited to straight abutment, but also angle abutment,
A step abutment can also be used, and an endless shape without a cut can also be used.

In FIG. 1, a transmission shaft 6 is driven at a rotational speed of 7000 revolutions per minute, lubricating oil (automatic transmission fluid) (referred to as ATF) heated to 140° C. is supplied through an oil passage 8, and the pressure of the ATF is increased. 10k
Wear and leakage tests were conducted by starting at 20 kg/cm2 and increasing the pressure by 20 kg/cm2 every 50 hours, and the results shown in FIGS. 2 and 3 were obtained.

In FIG. 2, curve A shows the amount of wear on the side surface of the seal ring in the conventional sealing device, and curve B shows the amount of wear on the side surface of the seal ring in the sealing device according to the present invention. Conventionally, abnormal wear occurs on the side surface of the seal ring at an oil pressure of 14 kg/cm2 immediately after 100 hours, and oil leaks rapidly, but with the sealing device according to the present invention, even after 300 hours and an oil pressure of 20 kg/cm2, the seal ring side surface wears out. It was found that the amount was small and that there was very little oil leakage. According to the present invention, the sealing device maintains its initial sealing performance even after 300 hours have passed.

[0013]

[Effects of the Invention] According to the present invention, a sealing device which has less wear, less oil leakage, and is lighter in weight has been obtained.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a sealing device according to the present invention.

FIG. 2 is a diagram showing seal ring side wear characteristics.

FIG. 3 is a diagram showing oil leakage characteristics.

[Explanation of symbols]

1 Seal ring 2 Groove 3 Groove member 4 Mating part 6 Mating part 9 Cooling groove 10 Communication groove

Claims (1)

[Claims] 1. A seal ring having a cooling groove formed on at least one side surface of the synthetic resin seal ring and penetrating in the circumferential direction, and a communication groove extending radially from the inner circumferential side to the cooling groove. 1. A sealing device for hydraulic equipment, characterized in that a mounting groove is formed of an iron-based member, and the iron-based member is mounted to an aluminum die-cast member by either press-fitting or casting.