JPH0868324A - Seal structure of water pump - Google Patents

Abstract

PURPOSE: To prevent falling down of the projecting part of a liquid gasket interposed between installing faces. CONSTITUTION: In the seal structure of a water pump in which a water pump 3 is installed by interposing a liquid gasket 12 in a cylinder block 1, a space 6 is provided so as to store the projecting part of the liquid gasket 12 inside of the installing faces 1b and 3b of the cylinder block 1 and the water pump 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water pump seal structure, and more particularly to a water pump seal structure using a liquid gasket.

[0002]

2. Description of the Related Art When a water pump is mounted on a cylinder block of an engine, an impeller 4 of a water pump 2 is inserted into a water pump mounting hole 1a of a cylinder block 1 as shown in FIG. Between the mounting surface 1b of the water pump 2 and the mounting surface 3b of the flange 3a formed on the casing 3 of the water pump 2.
2, the rubber ring or the O-ring 11 as shown in FIG. 2, or the liquid gasket 12 as shown in FIG. 3A, the mounting surface 1b of the cylinder block 1 and the water pump 2. And 3b are kept liquid-tight.

[0003]

However, when the sheet gasket 10 is used, the cost of parts is high, the number of assembling steps is large, the torque is reduced due to the fatigue of the gasket, and water leakage easily occurs. There is. Moreover, when the rubber ring or the O-ring 11 is used, the cost of the parts is higher than that of the sheet gasket,
There are problems such as a large number of assembly steps.

Further, when the liquid gasket 12 is used, as shown in FIG. 3 (b), the liquid gasket 12 is protruded from the flange 3a to the inside and the outside of the mounting surface over substantially the entire circumference and is solidified by tightening. This protruding portion 12a
Is an extremely thin film-like portion at the root portion, that is, a portion connected to the crimped portion between the mounting surfaces 1b and 3b,
The peripheral edge becomes thicker. Therefore, the inside, that is, the pump chamber 1c
The portion 12a protruding inside (FIG. 1) easily receives the water flow of the cooling water discharged from the pump chamber 1c during operation of the engine and is easily cut off from the root portion and falls off like a string. If the protruding portion 12a that has fallen out like a string bites into the mechanical seal 5 of the water pump 2, water leakage occurs, or if the thermostat valve (not shown) is flowed into the cooling water and bites, the valve does not seal. It may cause a malfunction.

The present invention has been made in view of the above points, and it is an object of the present invention to provide a seal structure for a water pump, which prevents the portion of the liquid gasket protruding from the mounting surface from falling off.

[0006]

To achieve the above object, according to the present invention, in a water pump seal structure for mounting a water pump with a liquid gasket interposed in a cylinder block, the mounting of the cylinder block and the water pump is performed. A space for accommodating the protruding portion of the liquid gasket is provided inside the surface.

According to a second aspect of the present invention, there is provided a seal structure in which a gap is formed inside the mounting surface of the water pump so as to be spaced apart from and face the inner peripheral surface of the water pump mounting hole of the cylinder block. According to the seal structure of claim 3,
It is formed by providing a convex shape slightly inward from the inner peripheral surface of the mounting hole of the water pump of the cylinder block so as to face the inner peripheral edge of the flange of the water pump.

In the seal structure according to the fourth aspect, the gap is formed continuously over the entire circumference of the mounting surface. Claim 5
The sealing structure of (1) is a partially formed convex shape.
In the seal structure according to the sixth aspect, the void of the convex root portion is wider than the tip.

[0009]

The liquid gasket, which is interposed between the mounting surface of the cylinder block and the mounting surface of the water pump, protrudes with the tightening and is accommodated in the space. This prevents the protruding portion from dropping off like a cord. In the second and third aspects, the protruding portion of the liquid gasket is housed in the space formed between the convex shape and the mounting hole portion.

In the fourth aspect, the protruding portion of the liquid gasket is accommodated in the annular space between the convex shape formed over the entire circumference and the mounting hole portion. In the fifth aspect, the protruding portion of the liquid gasket is housed in the space between the partially formed convex shape and the mounting hole portion. According to the sixth aspect, the void of the convex root portion is wider than that of the tip, and the protruding portion of the liquid gasket is reliably accommodated.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the accompanying drawings. The same members as those in FIG. 1 will be described with the same reference numerals. In FIG. 4, the casing 3 of the water pump 2
Is provided with a flange 3a on the mounting side to the cylinder block 1 over the entire circumference, and a plurality of bolt insertion holes 3c are formed along the circumferential direction. An end surface 3b of the flange 3a facing the mounting surface 1b of the cylinder block 1 is a mounting surface to the cylinder block 1 as shown in FIG.
An annular groove 3d is formed at substantially the center of the entire circumference.
The annular groove 3d is for enclosing a liquid gasket.

On the inner peripheral edge of the mounting surface 3b of the flange 3a, a convex shape 3e is formed in an annular shape over the entire circumference at an inward position with a slight gap d from the water pump mounting hole 1a of the cylinder block 1. A gap 6 is formed between the inner peripheral surface and the inner peripheral surface. This convex shape 3e is the flange 3
It can be easily formed by slightly extending inward and widening.

The operation will be described below. When mounting the water pump 2 on the cylinder block 1, first, the liquid gasket 12 is uniformly applied to the mounting surface 3b of the flange 3a of the water pump 2 or the mounting surface 1b on the cylinder block side over the entire circumference. Next, the water pump 2 is attached to the cylinder block 1, the attachment surface 3b of the casing 3 is brought into contact with the attachment surface 1b of the cylinder block 1, and the bolt 7
Tighten and fix at multiple points by.

As the bolt 7 is tightened, the liquid gasket 12 spreads uniformly from the annular groove 3d between the mounting surfaces 1b and 3b as shown in FIG. 5, and protrudes inward and outward from these mounting surfaces. The liquid gasket 12 that protrudes inside the mounting surface is
It is blocked by the convex shape 3e formed on the flange 3a and fills the space 6 formed between the convex shape 3e and the hole 1a of the cylinder block 1 to be solidified. As a result, the liquid gasket 12 is prevented from protruding into the pump chamber 1c (FIG. 4). As a result, the protruding portion of the liquid gasket 12 does not fall off, and it is possible to prevent the mechanical seal 5 from being caught and the thermostat from being caught in the valve.

FIG. 6 shows a second embodiment of a convex shape formed on the flange 3a of the casing 3, and the convex shape 3f is formed on the lower portion of the outer peripheral surface facing the inner peripheral surface of the hole 1a of the cylinder block 1. A groove 8 having a depth D (> d) is formed to form a void 8. That is, the void 8 is formed such that the root portion of the convex 3e is wider (larger) than the void at the tip of the void 6 (FIG. 5). As a result, the liquid gasket 12
The accommodation space of the protruding portion is increased, and the protruding portion can be more reliably closed.

Further, the convex shape 3e of the flange 3a of the casing 3 does not necessarily have to be provided over the entire circumference, but may be provided partially at appropriate intervals as shown in FIG. Further, as shown in FIG. 8, a convex shape 3e may be provided concentrically with the impeller 4 of the water pump 2 on the circumference to partially enlarge the gap 9 on the hole 1a side of the cylinder block 1. .

[0017]

As described above, according to the present invention, a space for accommodating the protruding portion of the liquid gasket is provided inside the mounting surface of the cylinder block and the water pump, so that the protruding portion of the liquid gasket is formed. It is possible to eliminate the harmful effects of falling off like a cord, and prevent water leaks, equipment malfunctions, and the like.

The seal structure according to claims 2 and 3 is simple because the gap is formed inside the mounting surface of the water pump so as to face the inner peripheral surface of the water pump mounting hole of the cylinder block in a spaced-apart relationship. With such a structure, the protruding portion of the liquid gasket can be accommodated. In the seal structure according to the fourth aspect, since the void is continuously formed over the entire circumference of the mounting surface, the protruding portion of the liquid gasket can be accommodated over the entire circumference, and the protruding portion is surely prevented from falling off. You can

In the seal structure according to the fifth aspect, the convex shape is partially formed over the entire circumference of the mounting surface, so that the structure can be simplified and the weight can be reduced. In the seal structure according to the sixth aspect, since the void in the convex root portion is wider than the tip end, the accommodation space of the protruding portion of the liquid gasket is wide, and the protruding portion of the liquid gasket can be accommodated more reliably.

[Brief description of drawings]

FIG. 1 is a sectional view of relevant parts showing a state in which a water pump to which a conventional seal structure is applied is mounted on a cylinder block.

FIG. 2 is a sectional view of an essential part when an O-ring is used as a seal member.

FIG. 3 is an explanatory diagram showing states before and after tightening when a liquid gasket is used as a seal member.

FIG. 4 is a cross-sectional view of an essential part showing a mounting state of a water pump to which a seal structure according to the present invention is applied to a cylinder block.

FIG. 5 is an enlarged view of a main part of FIG.

6 is an enlarged view showing a convex second embodiment formed on the flange of the water pump of FIG. 4. FIG.

FIG. 7 is an end view showing a convex third embodiment formed on the flange of the water pump of FIG.

8 is an end view showing a convex-shaped fourth embodiment formed on the flange of the water pump of FIG.

[Explanation of symbols]

 1 Cylinder Block 1a Water Pump Mounting Hole 1b Water Pump Mounting Surface 1c Pump Chamber 2 Water Pump 3 Casing 3a Flange 3b Mounting Surface 3e Convex 3c Annular Groove 6, 8 Void 12 Liquid Gasket

Claims (6)

[Claims] 1. A seal structure of a water pump for mounting a water pump with a liquid gasket interposed in a cylinder block, wherein a gap for accommodating a protruding portion of the liquid gasket is provided inside a mounting surface of the cylinder block and the water pump. This is a water pump seal structure. 2. The water pump according to claim 1, wherein the gap is formed inside the mounting surface of the water pump by providing a convex shape spaced apart from and facing the inner peripheral surface of the water pump mounting hole of the cylinder block. Seal structure. 3. The cavity is formed by providing a convex shape slightly inward from an inner peripheral surface of a mounting hole of a water pump of the cylinder block so as to face an inner peripheral edge of a flange of the water pump. Water pump seal structure. 4. The seal structure for a water pump according to claim 1, wherein the convex shape is formed continuously over the entire circumference of the mounting surface. 5. The seal structure for a water pump according to claim 1, wherein the convex shape is partially formed over the entire circumference of the mounting surface. 6. The seal structure for a water pump according to claim 3, 4 or 5, wherein the void is wider at the convex root portion than at the tip.