JP4493025B2 - Structure of radiator hose - Google Patents

Description

  The present invention relates to a structure of a radiator hose including a coil spring for preventing a recess for connecting a cooling water discharge port of a radiator and a cooling water suction port of an engine.

FIG. 4 exemplifies a general truck engine in which the radiator hose of the present invention is used, and shows a cooling system of the engine 30 having the radiator 2 in which a supercharger intercooler 40 is arranged. is there.
Cooling water heated by the engine 30 is controlled by a thermostat 32 so as to maintain an appropriate temperature of the engine. For example, the entire circulation flow rate flows into the upper tank 3 of the radiator 2 at full load. The air is cooled by the outside air and reaches the lower tank 4.

The cooling water reaching the lower tank 4 is guided from the cooling water discharge port 5 to the cooling water suction port 20a of the engine 30 via the radiator hose 10, and from the suction port of the water pump 20 to the cooling water system 30c via the discharge port. Pumped.
In FIG. 4, Cf indicates a vehicle frame (frame), a symbol Ke is an elastic material for suspending the engine 30, and a symbol Kr is an elastic material for suspending the radiator 2.

A radiator hose 10 as an object of the present invention includes a hose 12 formed in a layer shape with a knitted fabric and rubber, and a coiled spring 18 inserted into the hose 12.
5 and 6 show the hose 12, a straight tubular end portion 12a fitted to the radiator cooling water discharge port 5, a straight tubular end portion 12c fitted to the engine intake port 20a, and a gap therebetween. And a central portion 12b having a curved portion.

  The hose 12 is made of a layer that can be bent flexibly with cloth and rubber, and the central portion having the bent portion has a low bending rigidity, so that the radiator hose 10 can be easily attached and detached. And the relative displacement of the radiator 2 and the engine 30 when the engine is operating and when the vehicle is running is absorbed in the vertical and horizontal directions.

  Because of such flexible characteristics, the hose 12 alone cannot easily withstand the dent shrinkage due to the suction negative pressure of the water pump 20, and the coil spring 18 holds the inner diameter.

FIG. 7 shows the free state of the coiled spring 18 inserted into the hose 12.
One end portion 18a and the other end portion 18c are formed by close winding, and a central portion 18b formed in a spiral shape at a predetermined pitch is integrated with the end portion 18a to support almost the entire length of the hose 12 from the inside. Is configured to do.

8 and 9 are explanatory views showing the state of the coiled spring 18 inserted into the hose 12.
In FIG. 8 in which the hose 12 is shown as a straight tube, the cooling water discharge port 5 of the radiator and the suction port 20a of the engine are connected by the hose 12, and the radiator end 12a of the hose 12 and the engine side A coiled spring 18 is fitted between the end 12c. The form of the coiled spring 18 in FIG. 8 is in a normal state.

FIG. 9 shows a state where the coiled spring 18 is compressed to the engine side due to expansion and contraction of the radiator hose 10 due to vibration caused by engine operation and vehicle running, pulsation of cooling water, suction negative pressure of a water pump, and the like. .
Once in such a state, for example, the hose 12 on the cooling water discharge port side in FIG. 9 has no effect of preventing the diameter reduction, and as indicated by reference numeral S, the diameter of the recess is reduced to reduce the flow channel area, and the circulation Cooling water volume decreases. As a result, there is a risk of problems such as cavitation due to an increase in cooling water temperature or an increase in the suction negative pressure of the water pump.

  Conventionally, as a means for preventing the dent diameter reduction of the radiator hose due to the suction negative pressure, it has been generally performed to increase the wire diameter of the coil spring or to reduce the helical pitch. Regarding the movement of the spring, a method has been adopted in which the outer diameter of the coiled spring is pushed slightly larger than the inner diameter of the hose. However, this method has a drawback that it is difficult to insert a coiled spring and it is difficult to make it free.

As another technique, a technique has been proposed in which a hose heading toward the engine side of the radiator is simply attached to reduce the piping space (for example, see Patent Document 1).
However, this technique relates to the configuration of the radiator itself, and cannot solve the above-described problems.
JP 2001-310640 A

  The present invention has been proposed in view of the above-described problems of the prior art, and prevents the movement of the coiled spring in the radiator hose and prevents the hose dent from shrinking due to the suction negative pressure of the water pump. The purpose is to provide a hose structure.

The structure of the radiator hose according to the present invention includes a radiator including a coil spring (28) for preventing depression to connect the cooling water discharge port (5) of the radiator (2) and the suction port (20a) of the engine (30). In the structure of the hose (1), the hose portion (22) of the radiator hose (1) is configured by providing a reduced diameter portion (22b) smaller in diameter than the inner diameter of the radiator side in the vicinity of the cooling water discharge port (5). The coiled spring (28) is characterized in that the radiator-side outer diameter (d1) is formed larger than the inner diameter (D2) of the reduced diameter portion (22b) of the hose portion (22). (Claim 1).
In the above, the vicinity where the reduced diameter portion is provided is the vicinity of the end portion of the coil spring for preventing dents, and in the specific implementation of the reduced diameter portion, a reduced diameter shape corresponding to the shape of the coiled spring is used. Is preferred.

It is preferable that the hose portion (22) is gradually reduced in diameter from the inner diameter (D1) on the radiator side to the engine side (Claim 2).
In the above, the gradual reduction in diameter means, for example, a reduction diameter of about 1 to 5 mm with respect to a length of 10 mm, and a shape that can be manufactured by current manufacturing means manufactured by knitting with cloth and rubber is preferable.

It is preferable that the coiled spring (28) is gradually reduced in diameter from the radiator-side outer diameter (d1) to the engine-side outer diameter (d2).
In the above, the gradual diameter reduction means, for example, a diameter reduction dimension of about 1 to 5 mm with respect to a length of 10 mm. The specific shape of the coil spring is preferably a two-stage diameter in which the outer diameter on the radiator side is larger than the outer diameter on the engine side, and the step is gently connected to correspond to the reduced diameter shape of the hose portion. .

The coiled spring (28) has a radiator-side end (28a) and an engine-side end (28d) formed by a plurality of closely wound windings, the center (28c) is formed at an equal pitch, and the radiator It is preferable that the diameter is gradually reduced from the end portion (28a) of the close contact winding to the center portion (28c).
In the above, the gradual diameter reduction means, for example, a diameter reduction dimension of about 1 to 5 mm with respect to a length of 10 mm.
The close winding in the above means that the coil wires are wound in an overlapped state. Accordingly, both end portions formed by tight winding have a configuration in which the radial compression rigidity is high and no dent is generated. In order to keep the bending rigidity low, the central pitch may be determined according to the shape of the hose and the negative pressure resistance. In this embodiment, the pitch is 20 mm.

The coiled spring (28) preferably has a reduced diameter central portion (28c) and the end portion of the tight winding on the engine side having the same diameter (Claim 5).
Since the outer diameter is a two-stage shape having a large and small outer diameter, the coil spring can be easily attached to and detached from the hose portion.

According to the present invention having the configuration as described above,
(A) The hose portion of the radiator hose is configured by providing a reduced diameter portion that is smaller in diameter than the inner diameter on the radiator side in the vicinity of the cooling water discharge port. Since it is formed in a large diameter (Claim 1), the coiled spring moves to the engine side, so that there is an advantage that the trouble that the hose is dented by the negative suction pressure and the diameter of the circulating cooling water is reduced is prevented. .

(B) If the hose part is gradually reduced in diameter from the inner diameter on the radiator side to the engine side (Claim 2), it can be manufactured by the current manufacturing means, there is no new equipment, and there is no increase in manufacturing cost. is there.

(C) If the coiled spring is gradually reduced in diameter from the radiator-side outer diameter to the engine-side outer diameter (claim 3), there is an advantage that the manufacturing of the coiled spring is not different from the conventional method.

(D) The coiled spring has both ends on the radiator side and the engine side formed by a plurality of tightly wound windings, the central part is formed at an equal pitch, and is a connecting part between the end of the closely wound windings on the radiator side and the central part. If the diameter is reduced (Claim 4), there is an advantage that it can be fixed to both ends of the hose with tightly wound windings at both ends, bent at the center, and given elasticity, and has good detachability and dent-reducing resistance. There are benefits to be gained.

(E) If the coiled spring has the same diameter at the reduced central portion and the end of the close-contact winding on the engine side (Claim 5), the outer shape is a two-stage shape with a large and small outer diameter. There is an advantage that the mounting is easy because the small diameter side of the coiled spring is mounted on the hose portion because it is simple and less expensive.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
FIG. 1 is a side view showing a first embodiment of the structure of the radiator hose of the present invention. The actual shape of the radiator hose is a bend shape having a curved portion shown in FIGS. 5 and 6 of the conventional drawings, but the essence of the invention will be described with a straight pipe diagram.

  In FIG. 1, the radiator hose 1 includes a hose portion 22 mainly composed of an elastic material and a coil spring 28 fitted in the hose portion 22.

  The hose portion 22 is connected to a large-diameter first straight pipe portion 22a, a reduced diameter portion 22b connected to an end portion of the first straight pipe portion 22a, and a small diameter end of the reduced diameter portion 22b. A small diameter portion 22c, a large diameter portion 22d connected to the end of the small diameter portion 22c, a large diameter portion 22e connected to the end of the large diameter portion 22d, and a connection to the large diameter portion 22e The second straight pipe portion 22f is integrally formed.

  In the present embodiment, the first straight pipe portion 22a is fitted with a radiator discharge port 5 of about 60 mm on an inner diameter D1 of 74 mm, and accommodates a closely wound portion 28a on the radiator side of a coil spring 28 described later. It is configured.

The diameter-reduced portion 22b is formed into a truncated conical cylindrical shape whose diameter is gradually reduced from the end of the first straight pipe portion 22a in the vicinity of the coolant discharge port 5 of the radiator. Is formed.
The degree of diameter reduction is about 1 mm to 5 mm with respect to the diameter reduction length B1 = 10 mm.

  The small-diameter portion 22c is formed with an inner diameter D2 that fits a small-diameter portion 28c of a coiled spring 28, which will be described later, with a light interference fit, and its end is connected to the enlarged-diameter portion 22d.

  The enlarged diameter portion 22d is formed in a truncated cone-shaped cylindrical shape that is gradually expanded in diameter from the small diameter portion 22c to the large diameter portion 22e. The degree of diameter expansion may be the same as or more gradual than the diameter reduction of the reduced diameter portion.

  The large diameter portion 22e and the second straight pipe portion 22f have the same inner diameter D3, and the inner diameter D3 is formed to be the same diameter as the first straight pipe portion 22a in this embodiment. 22e usually has a curved portion because of the arrangement of the radiator hose 1.

  The second straight pipe portion 22f is configured so that the suction port 20a of the engine 30 is fitted to the inner diameter thereof by about 60 mm in this embodiment, and an engine-side end portion 28d of a coiled spring 28 described later is accommodated. ing.

  The coil spring 28 includes a first end portion 28a having a large diameter, a reduced diameter portion 28b connected to the end portion of the first end portion 28a, and a small diameter connected to the small diameter end of the reduced diameter portion 28b. The small-diameter portion 28c and the small-diameter second end portion 28d connected to the end portion of the small-diameter portion 28c are integrally formed linearly.

  In this embodiment, the first end portion 28a has an outer diameter d1 that is inserted into the first straight pipe portion 22a of the radiator hose 1 with a loose interference fit and that does not pass through the reduced diameter portion 22b. It is formed in a five-fold tight winding.

The reduced diameter portion 28b is reduced in diameter to a truncated cone shape corresponding to the reduced diameter portion 22b of the hose portion 22, and the end portion on the small diameter side is connected to the small diameter portion 28c.
The reduced-diameter portion 28b and the small-diameter portion 28c are formed at an equal pitch, which is 20 mm in this embodiment.

The second end portion 28d has an outer diameter d2 inserted into the second straight pipe portion 22f of the radiator hose 1 by a loose fit, and is formed in a five-fold tight winding in this embodiment.
The second end portion 28d and the small diameter portion 28c are formed to have the same diameter d2, and are formed to have substantially the same diameter as the inner diameter D2 of the small diameter portion 22c of the hose portion 22.

  The fitting of the coiled spring 28 into the hose part 22 is inserted into the first straight pipe part 22a of the hose part 22 from the second end 28d of the coiled spring 28 with reference to FIG. The second end portion 28d is inserted into the second straight tube portion 22f, and the first end portion 28a is pushed in until it comes into contact with the reduced diameter portion 22b. In this state, the coiled spring 28 has a free length. Adjust as follows.

  The coiled spring 28 in FIG. 1 is in the above-described fitting state, and there is a gap between the first end 28a and the cooling water discharge port 5, and the second end 28d and the cooling water suction port 20a It is fitted so that there is a gap between them.

  When the radiator hose 1 is mounted between the cooling water discharge port 5 and the cooling water suction port 20a, the coil spring 28 is easily attached by the bending flexibility of the hose portion 22 which does not increase the bending rigidity. it can.

  Further, the first end portion 28a prevents the coiled spring 28 from being drawn into the suction flow water having a negative pressure of the water pump 20 generated when the engine and the vehicle are operated, and the engine 30 and the radiator 2 due to the engine and vehicle vibrations. The movement of the coiled spring 28 due to the relative displacement is prevented and the engine 30 is not displaced. Therefore, the generation of the dent shrinkage of the hose portion 22 due to the negative suction pressure, the decrease in the circulating cooling water flow rate, and the cooling water temperature rise does not occur.

  FIG. 3 shows a second embodiment of the present invention. In this embodiment, the shape of the reduced diameter of the hose part is not gradual, and it is difficult to produce a conventional hose formed in layers with a knitted fabric and rubber, but another means that can produce an arbitrary shape is costly In the case where the problem is solved, the simple shape of the hose and the ease of winding the spring are advantageous.

  In FIG. 3, the radiator hose 1Z is composed of a hose portion 22Z mainly composed of an elastic material and a coil spring 28Z fitted inside the hose portion 22Z.

  The hose part 22Z is connected to a large-diameter first straight pipe part 22A, a reduced diameter part 22B connected to an end part of the first straight pipe part 22A, and an end part of the reduced diameter part 22B. An intermediate portion 22E having the same diameter as the first straight pipe portion 22A and a second straight pipe portion 22F connected to the intermediate portion 22E are integrally formed.

  The first straight pipe portion 22A is configured to fit the discharge port 5 of the radiator on the inner diameter, about 60 mm in the present embodiment, and to accommodate the close winding portion 28A on the radiator side of the coiled spring 28Z described later. Has been.

The reduced diameter portion 22B is formed by reducing the diameter in a stepped manner from the end of the first straight pipe portion 22A, which is in the vicinity of the coolant discharge port 5 of the radiator.
The degree of diameter reduction is about 1 mm to 5 mm.

  An intermediate portion 22E having a stepped diameter is connected to the end of the reduced diameter portion 22B, and a second straight pipe portion 22F is connected to the end of the intermediate portion 22E. The intermediate portion 22E usually has a curved portion.

  The second straight pipe portion 22F is configured to fit the water inlet 20a of the engine 30 on its inner diameter, about 60 mm in this embodiment, and to accommodate an end portion 28D on the engine side of a coiled spring 28Z described later. Has been.

  The coiled spring 28Z is connected to the first end portion 28A having a large diameter, a small diameter portion 28B connected to the end portion of the first end portion 28A in a stepped manner, and an end portion of the small diameter portion 28B. And a second end portion 28D having the same diameter.

  In the present embodiment, the first end portion 28A has an outer diameter d1A that is inserted into the first straight pipe portion 22A of the radiator hose 1Z with a loose interference fit and that does not pass through the small diameter portion 22B. It is formed in a heavy tight winding.

The small-diameter portion 28B is reduced in outer diameter so as to be loosely fitted into the reduced-diameter portion 22B of the hose portion 22Z, and is configured not to strike the hose portion 22Z from the inside during operation.
The small-diameter portions 28B are formed at an equal pitch and are 20 mm in this embodiment.

  In the present embodiment, the second end portion 28D is formed in a five-fold tight winding and has a high compression rigidity so as to prevent the small-diameter portion 28B from collapsing.

  The fitting of the coiled spring 28Z into the hose portion 22Z is the same as that in the first embodiment, and the operation and effect during operation of the engine and the vehicle are substantially the same.

  Although the above embodiment is directed to the lower hose, the negative pressure resistant structure of the present invention can also be applied to, for example, the upper hose, and the upper hose that has been in a pressurized state during operation in the cold season is stopped and the volume of cooling water is increased. It can also be applied to measures to reduce the negative pressure, reduce the diameter, and reduce the circulating cooling water in the engine. Thus, it is noted that the scope of the technology is not limited to radiator lower hoses.

The side sectional view of a 1st embodiment which shows the structure of the radiator hose of the present invention. The side view of the coiled spring currently fitted by the radiator hose of FIG. The sectional side view which shows the structure of the radiator hose of 2nd Embodiment. The block diagram which shows the cooling system of the engine with which the radiator hose of this invention is mounted | worn. The side view of the hose part of the conventional radiator hose. FIG. 6 is a top view of FIG. 5. The side view of the spring of the conventional radiator hose. The side view which shows the normal mounting state of the conventional radiator hose. The side view which shows the abnormal state which the spring in a hose moved to the engine side.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,10 ... Radiator hose 2 ... Radiator 3 ... Upper tank 4 ... Lower tank 5 ... Cooling water discharge port 20 ... Water pump 20a ... Water intake port 22, 22Z ... Hose part 22a ... 1st straight pipe part 22b ... Diameter reduction part 22c ... Small diameter part 22d ... Diameter expansion part 22e ... Large diameter part 22f ... 2nd straight pipe part 28 , 28Z: coiled spring 28a: end of the coiled spring on the radiator side (first end)
28b: Reduced diameter portion of the coiled spring 28c: Reduced diameter reduced portion of the coiled spring 28d: End of the coiled spring on the engine side (second end)
30 ... Engine D1 ... Inner diameter of the hose part on the radiator side D2 ... Inner diameter of the small diameter part of the hose part D3 ... Inner diameter of the hose part on the engine side

Claims (5)

In the structure of a radiator hose with a coil spring for preventing dents to connect the cooling water discharge port of the radiator and the intake port of the engine, the hose portion of the radiator hose has an inner diameter on the radiator side in the vicinity of the cooling water discharge port. A structure of a radiator hose comprising a smaller diameter reduced portion, wherein the coiled spring is formed such that the outer diameter on the radiator side is larger than the inner diameter of the reduced diameter portion of the hose portion. . The structure of the radiator hose according to claim 1, wherein the hose portion is gradually reduced in diameter from the inner diameter on the radiator side to the inner diameter on the engine side. The structure of the radiator hose according to claim 1, wherein the coiled spring is gradually reduced in diameter from the outer diameter on the radiator side to the outer diameter on the engine side. The coiled spring has a radiator-side end and an engine-side end formed by a plurality of tightly wound windings, the center portion is formed at an equal pitch, and the diameter is gradually reduced from the radiator-side end portion to the center portion. The structure of the radiator hose according to any one of claims 1 to 3. The structure of the radiator hose according to any one of claims 1 to 4, wherein the coiled spring has the same diameter at a reduced central portion and an end portion of the tight winding on the engine side.

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