JPH0673383U - Oil seal device - Google Patents

Abstract

(57) [Summary] [Purpose] Fix the oil seal ring without using the stopper ring. [Configuration] Crankshaft 1 in crankcase 17
6 is housed, both ends of the crankshaft 16 are rotatably supported by ball bearings 22, the connecting rod 15 is connected in the middle of the crankshaft 16, and the journal portion 24 of the crankshaft 16 and the shaft insertion hole of the crankcase 17 are inserted. Oil seal ring 40 between 46
Is installed. Shaft insertion hole 46 of the crankcase 17
The fixing groove 47 is annularly recessed in the inner peripheral surface of the, and the bulging deformation portion 45 of the outer peripheral surface 44 of the oil seal ring body 41 made of an elastic material is bulged in the fixing groove 47. [Effect] Since the bulging deformation portion 45 of the oil seal ring is engaged with the fixing groove 47, the oil seal ring 40 can be fixed to the shaft insertion portion 46 without a dedicated stopper ring.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil seal device, and more particularly, to an improvement in a fixing structure of an oil seal ring, and more particularly, to an effective device used as a crank device for driving an air compressor.

[0002]

[Prior art]

 Compressed air (hereinafter referred to as air) is generally used as a working energy source in braking devices for large vehicles such as buses and trucks. In order to obtain this air, in a brake system of a large vehicle, an air compressor is connected to the engine, and the air generated by this air compressor is applied to a wheel brake device via an air brake device or an air over hydraulic brake device. Is supplied to the brakes, so that the wheel brakes are activated.

In such an air compressor, a reciprocating piston type positive displacement pump is adopted, and as a driving device thereof, the piston is connected to a crankshaft via a connecting rod, and the piston is reciprocated by the rotational movement of the crankshaft. A crank device is used.

In the crank device used in this air compressor, the pressure in the crankcase fluctuates due to the action of the air conditioner, so that the oil in the crankcase between the crankcase and the end of the crankshaft is changed. An oil seal device is installed to prevent the outflow of oil. That is, the oil seal ring is sandwiched between the crankcase and the end of the crankshaft, and a stepped stopper is provided on the crankcase to fix the oil seal ring.

[0005]

[Problems to be solved by the device]

 However, in the conventional oil seal device used in such a crank device, the process for attaching the stopper to the crankcase is troublesome, and the space for the stopper may vary depending on the structure of the crankcase. Occasionally, it may not be possible to secure enough.

An object of the present invention is to provide an oil seal device capable of preventing the oil seal ring from coming off with a simple structure without requiring space and complicated processing.

[0007]

[Means for Solving the Problems]

 In the oil seal device according to the present invention, the shaft is inserted in the shaft inserting portion opened in the case, and the oil seal ring is provided between the inner peripheral surface of the shaft inserting portion and the outer peripheral surface of the shaft. In the oil seal device, a fixing groove is annularly recessed in the inner peripheral surface of the shaft insertion portion, while the outer peripheral surface of the oil seal ring is formed of an elastic material. A part of the outer peripheral surface made of the elastic material itself bulges into the fixing groove in a state of being inserted in the portion.

[0008]

[Action]

 According to the above-mentioned means, a part of the oil seal ring is bulged and deformed in the fixed groove that is sunk in the inner peripheral surface of the shaft insertion portion, so that the oil seal ring is protected from the case outside or the case. Even if an axial force is applied from the inside of the case, the oil seal ring can be prevented from coming off the shaft insertion part. That is, the oil seal ring can be fixed to the shaft insertion portion without the need for a dedicated stopper ring.

[0009]

【Example】

 FIG. 1 is a longitudinal sectional view showing a state in which an oil seal device according to an embodiment of the present invention is used in a crank device of an air compressor. 2A is an enlarged partial sectional view showing a II portion of FIG. 1, and FIG. 2B is an enlarged partial sectional view showing a portion corresponding to a II portion of an oil seal device according to another embodiment.

In this embodiment, the oil seal device according to the present invention is configured as an oil seal device in the crank device of the air compressor 11. The air conditioner press 11 includes a cylinder body 12. A cylinder chamber 13 is formed in the main body 12, and a piston 14 is reciprocally slidably fitted in the cylinder chamber 13.

The piston 14 is connected to a crankshaft 16 via a connecting rod 15. The rotational movement of the crankshaft 16 is converted into a linear movement by the connecting rod 15, and this linear movement is transmitted to the piston 14. Then, the pumping action of the air conditioner press is executed by the reciprocating linear movement of the piston 14.

A crankcase 17 is continuously provided below the cylinder body 12, and an internal chamber 18 is provided in the crankcase 17 so as to be continuously connected to the cylinder chamber 13. An oil pan 19 is formed at the bottom of the internal chamber 18. Bearing holders 20 and 21 are formed on side walls on both sides (hereinafter, left side and right side) of the crankcase 17, and ball bearings 22 and 22 are held on the left and right bearing holders 20 and 21, respectively. There is. The bearing holder 21 on the right side is provided with an oil return passage 23 at its lower portion and is opened so that the oil pan 19 is communicated with the outside.

In the inner chamber 18 of the crankcase 17, the crankshaft 16 is rotatably supported by the journal portions 24 and 25 at the left and right ends of the crankshaft 16 by the left and right bearings 22 and 22, respectively. There is. A boss 27 at the lower end of the connecting rod 15 is attached to the crank pin 26 of the crankshaft 16 while two left and right end surfaces 28, 29 are in sliding contact with the crank arms 30, 31 on both sides, respectively, and two bosses 27 are provided. It is rotatably connected in a split and aligned state. The piston 14 is rotatably connected to the boss portion 32 at the upper end of the connecting rod 15 by a pin 33.

Further, the left end of the crankshaft 16 is projected to the outside from the bearing holder 20 on the left side of the crankcase 17, and the left protruding end 34A of the crankshaft 16 is driven by another driven device such as an injection pump. A device (not shown) is configured to be coupled. On the other hand, the right protruding end portion 34B is adapted to be connected to an engine (not shown) via a transmission device such as a gear or directly.

Further, an oil seal ring 40 of the oil seal device according to this embodiment is fitted to the left side journal portion 24 of the crankshaft 16 at the outer side of the ball bearing 22. The oil seal ring 40 includes a body 41 formed of a circular ring shape by using an elastic material such as rubber or resin. A rib member 42 is embedded inside the main body 41. The rib member 42 is formed into a circular ring shape by using a material having appropriate elasticity such as stainless steel, and is formed concentrically with the main body 41. It is arranged.

A lip portion 43 is integrally formed on the inner peripheral side of the oil seal ring body 41, and the lip portion 43 has an appropriate elastic force on the outer peripheral surface of the left journal portion 24 of the crankshaft 16. It is always in sliding contact. The sliding contact of the lip portion 43 with the journal portion 24 ensures the desired oil seal performance.

On the other hand, a convex curved surface 44 is integrally formed on the outer surface side of the oil seal ring body 41. That is, the curved surface 44 has a cross-sectional shape of a substantially right and left symmetrical symmetrical arc shape in which the central portion in the axial direction projects outward in the radial direction and both left and right ends thereof reced inward in the radial direction. Has been formed. The central portion of the curved surface 44 forms a bulging deformation portion 45 described later.

In the present embodiment, a fixing groove 47 is disposed on the inner peripheral surface of the left shaft insertion hole 46 as a shaft insertion portion of the crankcase 17 so as to face the oil seal ring 40, and is recessed in a circular ring shape. It is set up. The fixed groove 47 is formed in a series of annular groove shapes having a constant width and a constant depth, and its axial width is approximately one third of the axial width of the curved surface 44 of the oil seal ring body 41. It is set.

When the oil seal ring 40 having the above structure is press-fitted into the shaft insertion hole 46 of the crankcase 17, the central portion of the curved surface 44 on the outer periphery of the oil seal ring body 41 has the fixing groove 47. The bulging deformation portion 45 is formed by bulging inward with the elastic deformation force of the main body 41 itself.

When the oil seal ring 40 is press-fitted into the shaft insertion hole 46, the curved surface 44 on the outer periphery of the oil seal ring main body 41 forms an angle of acceptance relative to the entrance of the shaft insertion hole 46, so that the curve is curved. The surface 44 serves as a guide to smoothly press the oil seal ring 40 into the shaft insertion hole 46.

When the bulging deformation portion 45 bulges into the fixed groove 47, a part of the oil seal ring main body 41 is engaged with the left and right edges of the fixed groove 47. 40 is fixed to the shaft insertion hole 46 of the crankcase 17 by the bulging deformation portion 45 of the oil seal ring body 41 itself and the fixing groove 47. That is, the oil seal ring 40 is fixed to the shaft insertion hole 46 of the crankcase 17 without using a dedicated stopper ring or the like.

In FIG. 1, 35 is a cylinder head, 36 is a discharge valve, 37 is a suction valve, and 38 is an unloading device.

Next, the operation will be described. When the crankshaft 16 is rotationally driven by the engine, the rotational movement of the crankshaft 16 is converted into a reciprocating linear movement by the connecting rod 15, and this reciprocating linear movement is transmitted to the piston 14. When the piston 14 reciprocates in the cylinder chamber 13, the reciprocating motion of the piston 14 causes the discharge valve 36 and the suction valve 37 to be opened and closed to supply air to the reservoir. Also, during this operation, oil from the engine lubricating oil supply system is supplied into the oil pan 19.

During such an air compressor action, the pressure in the internal chamber 18 of the crankcase 17 also fluctuates, so an axial force acts on the oil seal ring 40, causing the oil seal ring 40 to pass through the shaft insertion hole 46. Attempts to move axially within.

However, in this embodiment, since the bulging deformation portion 45 of the oil seal ring 40 bulges into the fixing groove 47, the oil seal ring 40 can be securely fixed and the crankcase 17 It is possible to prevent the oil seal ring 40 from floating in the shaft insertion hole 46 due to the fluctuation of the internal pressure.

According to the present embodiment described above, since the bulging deformation portion 45 of the oil seal ring 40 is engaged with the fixed groove 47 that is recessed in the shaft insertion hole 46, The pressure in the internal chamber 18 of the crankcase 17 fluctuates to prevent the oil seal ring 40 from moving in the shaft insertion hole 46 in the axial direction even if an axial force acts on the oil seal ring 40. Therefore, it is possible to reliably prevent the oil seal ring 40 from coming off.

Since the oil seal ring 40 is fixed by the oil seal ring body 41 and the fixing groove 47, it is not necessary to use a dedicated stopper ring, and complicated processing can be omitted. Further, since the fixing groove 47 fits within the width of the oil seal ring 40, it is not necessary to increase the space.

Further, since the curved surface 44 is formed on the outer peripheral surface which is the press-fitting surface side of the oil seal ring body 41 into the shaft insertion hole 46, when the oil seal ring 40 is press-fitted into the shaft insertion hole 46. The oil seal ring 40 can be easily pressed into the shaft insertion hole 46.

It is needless to say that the present invention is not limited to the above-mentioned embodiment, and various modifications can be made without departing from the scope of the invention.

For example, as shown in FIG. 2B, when the protrusion 48 is provided in the fixing groove 47, the bulging deformation portion 45 formed on the outer peripheral surface of the oil seal ring main body 41 is protruded. 8 is locked, the movement of the oil seal ring 40 in the axial direction of the shaft insertion hole 46 can be regulated more reliably, and the oil seal ring 40 can be more reliably prevented from coming off. it can.

Further, the fixed groove is not limited to being formed as a series of annular grooves in the circumferential direction, but may be formed in an annular shape that is intermittent in the circumferential direction.

In the above embodiment, the case of being used in the crank device of the air compressor has been described, but the present invention is applied to all oil seal devices for bearings that are lubricated by lubricating oil in other crank devices and the like. be able to.

[0033]

[Effect of device]

 As described above, according to the present invention, the oil seal ring is fixed to the shaft insertion hole by bulging and deforming a part of the oil seal ring in the fixing groove that is recessed in the inner peripheral surface of the shaft insertion hole. With this configuration, the oil seal ring can be prevented from coming off without providing a dedicated stopper ring for fixing the oil seal ring to the crankcase.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing a state in which an oil seal device according to an embodiment of the present invention is used in a crank device of an air compressor.

2A is an enlarged partial sectional view showing a II portion of FIG. 1, and FIG. 2B is an enlarged partial sectional view showing another embodiment.

[Explanation of symbols]

11 ... Air compressor, 12 ... Cylinder body, 13 ...
Cylinder chamber, 14 ... Piston, 15 ... Connecting rod, 16 ... Crank shaft, 17 ... Crank case, 18 ... Inner chamber, 19 ... Oil pan, 20, 21 ... Bearing holder, 22 ... Ball bearing, 23 ... Oil return path, 24, 25 ... Journal part, 26 ... Crank pin, 27 ... Boss part, 28, 29 ... End face, 30, 31 ... Crank arm, 32 ... Boss part, 33 ... Pin, 34A, 34B
... projection end, 35 ... cylinder head, 36 ... discharge valve, 3
7 ... Suction valve, 38 ... Unloading device, 40 ... Oil seal ring, 41 ... Oil seal ring body, 42
... rib member, 43 ... lip portion, 44 ... curved surface, 45 ... bulging deformation portion, 46 ... shaft insertion hole (shaft insertion portion), 47 ... fixing groove, 48 ... protrusion.

Claims (1)

[Scope of utility model registration request] 1. An oil seal device in which a shaft is inserted into a shaft insertion portion opened in a case, and an oil seal ring is provided between an inner peripheral surface of the shaft insertion portion and an outer peripheral surface of the shaft. A fixed groove is annularly recessed in the inner peripheral surface of the shaft insertion portion, while the outer peripheral surface of the oil seal ring is formed of an elastic material, and the oil seal ring is inserted in the shaft insertion portion. A part of the outer peripheral surface of the elastic material itself bulges into the fixed groove.