JPH0645649Y2 - gasket - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Purpose of Invention] (Field of Industrial Application) The present invention relates to a gasket provided in, for example, an automobile engine to seal between a cylinder head and a cylinder block.

(Prior Art) For example, an automobile engine 1 may include a plate-shaped cylinder head gasket (hereinafter referred to as a gasket) 2 as shown in FIG. In other words, the gasket 2 is sandwiched between the cylinder head 3 and the cylinder block 4 which form the main body of the engine 1, and seals the joint between these two members 3 and 4 to prevent gas leakage from this joint. Is to prevent. The plate surface of the gasket 2 is provided with a plurality of holes 6, etc. such as a cylinder hole for communicating the inside of the cylinder 5, ..., a bolt hole for passing a coupling bolt (not shown), and a water hole for circulating engine cooling water. It is provided.

In addition, such an automobile engine 1 includes an engine 1
There is one that uses the heat of the cooling water, which has become high temperature by exchanging heat, for the car heater for heating the passenger compartment. That is, the cooling water flows through the inside of the car heater bypass (not shown) and is fed into the engine 1 by the water pump 7 as indicated by arrows A to D in FIG. Then, the cooling water A sent to the engine 1 is once split into the cylinder head 3 side and the cylinder block 4 side to cool both members 3 and 4, and then merges and flows out of the engine. . The rocker cover is shown at 3a in FIG.

By the way, in the engine 1 as described above, in general, during the warm-up operation, the cylinder head 3 rather than the cylinder block 4
Becomes hotter first. The cooling water B that has flowed through the cylinder head 3 and exchanged heat with the cylinder block 4
On the side of the cylinder head 3 and exchanges heat with the cooling water C on the side of the cylinder head 3 to generate a temperature difference.
Furthermore, the water temperature of the cooling water D which is merged and returned to the car heater bypass is balanced and becomes lower than the water temperature of the cooling water B flowing through the cylinder head 3 side.

(Problems to be solved by the invention) In other words, during the warm-up operation in which the temperature of the engine 1 itself is not too high, when the cooling water C flowing through the cylinder block 4 merges with the cooling water B flowing through the cylinder head 3, the car heater・ Because the engine cooling water D returned to the bypass has a low temperature, the car heater is not effective and heating cannot be performed efficiently.

An object of the present invention is to make it possible to sufficiently raise the temperature of engine cooling water sent to the outside of the engine during warm-up operation.

[Constitution of device]

(Means and Actions for Solving the Problems) In order to achieve the above object, the present invention provides a gasket provided in an engine having a cylinder head and a cylinder block coupled to each other and having a water hole through which engine cooling water passes. On the surface of the cylinder block side, made of shape memory alloy,
A spiral control valve is provided which contracts in the winding diameter direction when deformed to close the water hole and expands in the winding diameter direction when recovering the shape to open the water hole.

By doing so, the present invention aims to sufficiently raise the temperature of the engine cooling water sent to the outside of the engine during warm-up operation.

(Embodiment) An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. The same parts as those described in the section of the prior art are designated by the same reference numerals, and the description thereof will be omitted.

FIG. 1 shows a main part of an embodiment of a cylinder head gasket (hereinafter referred to as a gasket) 2 according to the present invention. This gasket 2 is provided in, for example, an automobile engine 1, and 6a is a cylinder 5 in the figure.
Cylinder holes for communicating the inside of the cylinder, and 6b, 6b are bolt holes for allowing bolts (not shown) for connecting the cylinder head 3 and the cylinder block 4 to pass therethrough. Although only one cylinder hole 6a is shown in the figure, a plurality of cylinder holes 6a are formed corresponding to the number of cylinders 5 ... The bolt holes 6b, 6b are also provided so as to correspond to the number and arrangement of bolts (not shown) that connect the cylinder head 3 and the cylinder block 4.

Further, 6c and 6c shown in the figure are circular water holes having the same diameter. The water holes 6c, 6c communicate with a water jacket or the like formed around the cylinders 5 inside the engine 1, and are supplied from a radiator (not shown) via the water pump 7 and circulate inside the engine 1. The engine cooling water passes through. Although only two water holes 6c, 6c are shown in the figure, the number and arrangement are such that a sufficient amount of cooling water necessary for cooling the engine 1 can be circulated.

Further, on the mating surface 8 of the gasket 2 with the cylinder block 4, there are provided control valves 9 ... Which regulate the opening area of the water holes 6c. That is, the control valves 9 ... Are made of a wire rod made of a shape memory alloy, and are formed in a spiral shape as shown in FIGS. The control valve 9 ... Stores the shape gently wound while forming a gap like the one control valve 9a in the figure. Further, the control valves 9 ... Are deformed into a tightly wound shape without a gap like the other control valve 9b in the figure. The control valves 9 ... Are fixed to the vicinity of the water holes 6c. The control valves 9 ... Are arranged so as to face the water holes 6c. In addition,
The control valves 9 ... Are attached to other water holes 6c of the water holes 6d provided at a position near the water pump 7, as schematically shown in FIG. It should be noted that there may be a plurality of water holes 6d provided near the water pump 7.

Further, when the cooling water is at a low temperature, that is, when the engine 1 is not started or when warming up, etc., the control valves 9 ... Are tightly wound like the other control valve 9b. It is in a deformed state. And the control valve 9b is a water hole
The entire area of 6c is closed to reduce the opening area of the water hole 6c. As shown in FIG. 1, each control valve 9 ... May be deformed so as to block the water hole 6c while leaving a part thereof, or may be deformed so as to block the entire water hole 6c. Good. Further, when the cooling water reaches a high temperature after the warm-up operation of the engine 1 is finished, the control valves 9 ... Extend like the above-mentioned one control valve 9a to recover the memory shape. The control valve 9a opens the water hole 6c to increase the opening area of the water hole 6c.

That is, the cooling water A sent to the engine 1 during warm-up operation
Since the water temperature is low, the control valves 9 ... Close the water holes 6c. Then, the flow rate of the cooling water C that flows from the cylinder block 4 to the cylinder head 3 is regulated, and only the cooling water B that has passed through some of the water holes 6d near the water pump 7 is supplied to the cylinder head 3. Inflow. Therefore, the flow rate of the cooling water D sent from the cylinder head 3 to the car heater bypass (not shown) is reduced, and the water temperature of the cooling water D is increased. Therefore, the effect of the car heater is improved even during warm-up operation of the engine 1, and heating can be performed efficiently.

When the cylinder block 4 becomes hot and the warm-up operation ends, the temperature of the cooling water inside the cylinder block 4 rises, and the control valves 9 ... And the water hole 6d
Other water holes 6c ... Are also opened, and the cooling water inside the cylinder block 4 has the above-mentioned water holes as shown by the chain double-dashed line C ...
It passes through 6c and flows into the cylinder head 3. further,
The cooling water C that has flowed into the cylinder head 3 merges with the cooling water B that has flowed through the cylinder head 3 and is sent to the car heater bypass at a temperature sufficient to be used for heating the vehicle interior. Therefore, when the warm-up operation ends, the flow rate of the cooling water flowing through the inside of the engine 1 increases, and the engine 1 can be sufficiently cooled.

Further, since the control valves 9 ... Are attached to the mating surface 8 of the gasket 2 with the cylinder block 3, they are always pushed to the mating surface 8 side by the water pressure of the cooling water C on the cylinder block 3 side. There is.

In this embodiment, the temperature at which the control valves 9 operate is set so that the cooling water inside the cylinder block 4 does not excessively reduce the temperature of the cooling water B on the cylinder head 3 side. . However, the operating temperature of the control valves 9 ... Is not limited to this, and may be freely set to another temperature. That is, if the operating temperature of the control valves 9 is set lower than the operating temperature in the present embodiment, the flow rate of the cooling water B flowing through the cylinder head 3 increases and the cylinder head 3
The temperature will drop. And the combustion chamber of cylinder 5 ...
It is possible to prevent excessive temperature rise in the intake pipe (not shown), prevent knocking, and improve charging efficiency. If the operating temperature is set higher than the operating temperature in this embodiment, the flow rate of the cooling water C flowing through the cylinder block 4 decreases and the temperature of the cylinder block 4 rises. Then, the main moving, that is, the friction of the main moving system parts such as the piston and the cylinder 4 can be reduced.

The operating temperature of each control valve 9 may be set equal to all the control valves 9 ... Or may be set individually or plurally.

[Effect of device]

As described above, according to the present invention, the gasket, which has the water hole through which the engine cooling water passes, is made of a shape memory alloy on the surface of the cylinder block side, and when deformed, it contracts in the winding radial direction to close the water hole. A spiral control valve is provided which expands in the winding diameter direction to open the water hole at the time of recovery.

Therefore, the present invention has the effect that the temperature of the engine cooling water sent to the outside of the engine during warm-up operation can be sufficiently increased.

[Brief description of drawings]

1 to 3 show an embodiment of the present invention.
The drawing is a plan view showing the main part, FIG. 2 is a side sectional view taken along line IV-IV in FIG. 1, and FIG. 3 is a schematic side sectional view showing a flow path of engine cooling water. FIG. 5 and FIG. 5 show a conventional example, FIG. 4 is a perspective view showing an assembled state of a cylinder head and a cylinder block, and FIG. 5 is a schematic side sectional view showing a flow path of engine cooling water. . 1 ... Engine, 2 ... Gasket, 3 ... Cylinder head, 4 ... Cylinder block, 6c ... Water hole, 9 ... Control valve.

Claims (1)

[Scope of utility model registration request] 1. A gasket, which is provided in an engine in which a cylinder head and a cylinder block are coupled to each other and has a water hole through which engine cooling water passes, wherein a cylinder block side surface is made of a shape memory alloy and is wound when deformed. A gasket having a spiral control valve that contracts in the radial direction to close the water hole and expands in the winding diameter direction when the shape recovers to open the water hole.