JP2003129845A - Cooling structure for water cooled v engine and assembling method of flexible connecting pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve workability of flexible connecting pipe assembly, and to stably and easily mount a flexible connecting pipe in a V bank space with a high level of positioning accuracy. SOLUTION: A water cooled V engine 26 is disposed in such a manner that front and rear engine cylinders are formed in a V-shape by the vehicle side view. The flexible connecting pipe 34 connects a water jacket 50F of an engine front cylinder 35 and a water jacket 50R of a rear engine cylinder 33 to a V bank space 41 formed by the front and rear engine cylinders 35 and 33. The flexible connecting pipe 34 is contained in a reinforcing structure in which a reinforcing member is buried, wherein a holding part 64 also employed as a handle is protrusively provided on the outer peripheral part integrally.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a water-cooled V for motorcycles.
More particularly, the present invention relates to a cooling structure for a water-cooled V-type engine and a method for assembling a flexible connecting pipe in which the assembling property of a cooling water hose connecting between water jackets of front and rear engine cylinders is improved.

[0002]

2. Description of the Related Art Some motorcycles are equipped with a water-cooled V-type engine. In this water-cooled V-type engine, V
Type V engine with a radiator installed in front of the engine, water cooled by the radiator is forcibly circulated to the front and rear engine cylinders by a water pump, and cooling water is used to cool the front and rear engine cylinders. There is a structure.

As a cooling structure of this water-cooled V-type engine,
Japanese Utility Model Publication No. 6-3142 and Japanese Patent Application Laid-Open No. 10-4705.
There is a technique disclosed in Japanese Patent No.

In the former water-cooled V-type engine cooling structure, the water jackets of the front engine cylinder and the rear engine cylinder are connected by a rubber connecting pipe in the V bank space, and the axial movement of the connecting pipe is prevented by a circlip. Then, the connection pipe is positioned.

However, in the cooling structure for the water-cooled V-type engine, the work of assembling the rubber connecting pipe in the narrow V-bank space is troublesome and difficult. To assemble the rubber connecting pipe, insert the connecting pipe into the union pipe of one engine cylinder in advance, install the other engine cylinder in the crankcase, and place the other union pipe at the front and rear in the axial direction. A connection pipe is slid in the axial direction on the side of the union pipe to be connected to form a cooling water passage.

In the latter cooling structure for a water-cooled V-type engine, a rubber connecting pipe is inserted into the inner circumference of a union pipe protruding from the front and rear cylinder blocks of the V-type engine, and two positioning rings are provided. The clip is fitted into the connecting pipe at a distance in the axial direction to position and fix the connecting pipe.

Also in this water-cooled V-type engine cooling structure, when assembling the V-type engine, one cylinder block is installed in the crankcase, and one ring-shaped clip end is removed from the union pipe protruding from the cylinder block. Install the other cylinder block into the crankcase with the rubber connecting pipe inserted, and when the front and rear union pipes are aligned in the axial direction, slide the rubber connecting pipe in the axial direction to move the other union pipe. The cooling water passage is formed by inserting and fitting the ring-shaped clip into the connecting pipe again.

[0008]

In the above-described cooling structure for the double water-cooled V-type engine, the rubber connecting pipe is liquid tightly and tightly connected to the union pipe, so that the rubber connecting pipe is slid in the axial direction. Is not easy, and it is difficult to perform this axial sliding in a narrow V bank space.

Further, since a circlip or a ring-shaped clip having a separate structure is detachably used for positioning the rubber connecting pipe, workability is poor, and an assembling work for mounting the clip for positioning the connecting pipe. Is complicated and takes a long time.

The present invention has been made in consideration of the above circumstances, and improves workability of assembling the flexible connecting pipe, and allows the flexible connecting pipe to be stably and easily attached with high positioning accuracy. An object of the present invention is to provide a cooling structure for such a water-cooled V-type engine.

Another object of the present invention is to provide a water-cooled V type in which a flexible connecting pipe is integrally formed with a grip portion and an outer peripheral clamp groove so that the connecting pipe can be stably and easily assembled without impairing the strength of the connecting pipe. An object of the present invention is to provide an engine cooling structure and a method of assembling a flexible connecting pipe.

Another object of the present invention is to eliminate the need for a separate circlip or ring clip for assembling the flexible connecting pipe,
Improves workability and assemblability for flexible connection pipe assembly,
An object of the present invention is to provide an improved cooling structure for a water-cooled V-type engine and a method for assembling a flexible connecting pipe.

[0013]

In order to solve the above-mentioned problems, a cooling structure for a water-cooled V-type engine according to the present invention is provided.
As described in claim 1, in a water-cooled V-type engine in which the front and rear engine cylinders are arranged in a V shape in a vehicle side view, the water of the front engine cylinder is provided in a V bank space formed by the front and rear engine cylinders. A flexible connecting pipe for connecting the jacket and the water jacket of the rear engine cylinder is provided, and the flexible connecting pipe has a reinforcing structure in which a reinforcing member is embedded.
The outer peripheral portion is integrally provided with a grip portion that also serves as a handle.

In order to solve the above-mentioned problems, a cooling structure for a water-cooled V-type engine according to the present invention is characterized in that, as described in claim 2, the flexible connecting pipe has outer peripheral clamps on both end sides. The groove is integrally formed, and the grip portion is integrally formed on an axial center side adjacent to one of the outer peripheral clamp grooves. Further, as described in claim 3, the flexible connection pipe is provided. Is a flexible reinforcing hose embedded with a reinforcing member, cut into required lengths, and the outer peripheral portion of the cut hose is subjected to a secondary molding process to integrally include an outer peripheral clamp groove and a grip portion. As described in claim 4, the flexible connecting pipe cuts a flexible reinforcing hose in which a reinforcing member is embedded into a desired length, and a secondary molding process is performed on an outer peripheral portion of the cutting hose. The outer peripheral clamp groove and the outer peripheral flange are integrally provided. Than it is.

Further, in order to solve the above-mentioned problems,
The cooling structure for a water-cooled V-type engine according to the present invention is claim 5.
As described above, the cylinder heads of the front and rear engine cylinders are provided with projecting union pipes communicating with the water jacket, and the union pipes are arranged so as to face the V bank space, and the union pipes are flexible. The flexible connecting pipes are connected to each other, and tightening clamps are attached to the outer peripheral clamp grooves formed on both end sides of the flexible connecting pipes and tightened.

On the other hand, in order to solve the above-mentioned problems, the method for assembling the flexible connecting pipe used in the water-cooled V-type engine according to the present invention, as set forth in claim 6, has the front and rear engine cylinders. Among them, the one engine cylinder is installed on the crankcase in a state where the flexible connecting pipe is assembled to the union pipe protruding from the cylinder head of the one engine cylinder, and then the cylinder head of the other engine cylinder is installed. When assembling, at least immediately before the union pipe protruding from the other cylinder head comes into contact with the flexible connecting pipe, operate the grip portion of the flexible connecting pipe to pull up the free end side of the flexible connecting pipe. While pulling up the free end side of the flexible connecting pipe, while moving the cylinder head in the axial direction of the cylinder block,
The flexible connection pipe is assembled to the union pipe of the cylinder head, and the flexible connection pipe is tightened by tightening the tightening crank of the flexible connection pipe while the other cylinder head is installed on the cylinder block on the crankcase. Tube V
This is a method of providing in a bank space.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described with reference to the accompanying drawings.

1 and 2 are a left side view and a plan view of a motorcycle equipped with a cooling structure for a water-cooled V-type engine according to the present invention.

The motorcycle 10 includes a body frame 11 made of, for example, a steel pipe or an aluminum frame. The vehicle body frame 11 has a pair of left and right tank rails 13 and a down frame 14 extending from a head pipe 12 located in the forehead. The tank rail 13 extends obliquely rearward and downward from the head pipe 12 at a shallow angle, while the down frame 14
After being extended obliquely rearward and downward at a steep angle, is curved and extends rearward in a substantially horizontal direction, and is connected to the rear portion of the tank rail 13 via a pair of left and right rear frames 15.

The body frame 10 is reinforced by interconnecting the vicinity of the head pipe 12, the left and right tank rails 13, and the down frame 14 with various reinforcing pipes and bridge frames.

A front fork assembly 18 for supporting a front wheel 17 is attached to the head pipe 12 of the vehicle body frame 11.
The front fork assembly 18 is pivotally supported by a handlebar 19. Further, the tank rail 13 of the vehicle body frame 11 and the rear end of the down frame 14 are connected by a center frame 20, and a swing arm 21 extending rearward is pivotally supported by the center frame 20 so as to be vertically rotatable. The rear wheel 22 is supported at the rear end of the swing arm 21.

Further, the tank rail 1 of the vehicle body frame 11
3 is overlaid with a fuel tank 25.
A water-cooled V-type engine 26 is mounted below. The V-type engine 26 includes the tank rail 13 and the down frame 14.
It is mounted on the lower center of the body frame 11 surrounded by the center frame 20, and its output is transmitted to the rear wheel 22 by the shaft drive mechanism 27 (see FIG. 3) provided inside the swing arm 21.

A head lamp 28 is provided in front of the fuel tank 25, and an operation seat 29 is installed adjacent to the rear of the fuel tank 25. The driving seat 29 is placed on a seat rail (not shown) from the rear portion of the fuel tank 25 to above the rear wheel 22.

A radiator 30 is provided between the left and right down frames 14 of the vehicle body frame 11. The water cooled by the radiator 30 is guided along the lower portion of the V-type engine 26, and is sucked by the water pump 2 via the water inlet hose 31, as shown in FIG. 3, and subsequently, the water outlet of the water pump 32. It is connected to the rear engine cylinder 33 of the V-type engine 26 via a hose (not shown).

The cooling water that has cooled the rear engine cylinder 33 is subsequently guided to the front engine cylinder 35 via a flexible connecting pipe 34 as a cooling water hose, and after cooling this engine cylinder 35, the front engine cylinder 3 is cooled.
5 is connected to the upper portion of the radiator 30 via a connection hose (not shown) such as heat resistant rubber and is sent to the radiator 30. A cooling water circulation system 36 is formed between the radiator 30 and the V-type engine 26 so that the cooling water cooled by the radiator is forcibly circulated in the V-type engine 26. The connection hose is provided with a thermostat (not shown). A water outlet hose (not shown) from the water pump 32 may be guided to an intermediate portion between the front and rear engine cylinders 35 and 33. In FIG. 3, reference numeral 37 is an oil filter.

On the other hand, in the V-type engine 26, a front engine cylinder 35 and a rear engine cylinder 33, which are installed in a crankcase 40, are arranged in a V-shape in a side view in the vehicle front-rear direction.
A V-bank space 41 is formed between 5 and 33. This V
A flexible connection pipe 34 having pressure resistance and heat resistance is arranged in the bank space 41. A carburetor 44 that constitutes an engine intake system 43 is provided above the flexible connection pipe 34, and the carburetor 44 allows the engine cylinders 33, 35
The air-fuel mixture is supplied to.

The carburetor 44 is a down-draft type whose intake passage (venturi passage) is oriented in a substantially vertical direction, and a bifurcated inlet pipe is provided between the carburetor 44 and the front and rear cylinder heads 46F and 46R. Connected.

The front and rear engine cylinders 35 and 33 are cylinder blocks 45F and 45R installed on the crankcase 40, and a cylinder head 46 assembled on the cylinder blocks 45F and 45R.
F and 46R and cylinder head covers 47F and 47R assembled on the cylinder heads 46F and 46R are integrally assembled by a plurality of stud bolts 48 and 48. Front and rear engine cylinders 3
Water jackets 50F and 50R vertically penetrating the cylinder blocks 45F and 45R and the cylinder heads 46F and 46R are formed in the cooling tanks 5 and 33, and the V-type engine 26 is cooled by cooling water passing through the water jackets 50F and 50R. It is like this.

Water jackets 50F, 50 are provided on the cylinder head 46F of the front engine cylinder 35 and the cylinder head 46R of the rear engine cylinder 33.
Union pipes 51F and 51R communicating with R are provided in a protruding manner. Front and rear union pipes 51F, 51R
Is both engine cylinders 35, 33 and crankcase 40
When it is installed in the V bank space 41, it is axially aligned in the V bank space 41. Front and rear union pipes 51F, 51
R is connected by a flexible connecting pipe 34 as a cooling water hose. The flexible connecting pipe 34 constitutes a part of the cooling water circulation system 36, and forms a cooling water passage therein.

A reinforcing hose 55 made of a heat resistant material as shown in FIG. 5A is used for the flexible connecting pipe 34 in order to have heat resistance and pressure resistance. The reinforcing hose 55 is extruded or drawn with an inner tube rubber 56 made of a heat-resistant rubber material and a cover rubber 57 serving as an outer tube rubber having a reinforcing layer 58 in which a reinforcing member such as a fiber-like reinforcing thread is wound. Molded by molding. Specifically, after the inner tube rubber 56 is extruded, a reinforcing thread is formed on the outer surface of the inner tube rubber 56 to form a reinforcing layer 58, and the cover rubber 57 is formed outside the formed reinforcing layer 58. The long reinforcing hose 55 shown in FIG. 5 (A) is manufactured through each manufacturing process of extruding.

This reinforcing hose 55 is provided with a required axial length,
For example, the cutting hose 60 shown in FIG. 5 (B) is obtained by cutting every 46 mm in length. Subsequently, the cutting hose 60 is subjected to a secondary molding process to obtain the flexible connecting pipe 34. The cutting hose 60 is set in a split mold (not shown) such as an injection mold for matching, and the same rubber material as the reinforcing hose 55, for example, EPDM, is added to cover the hose 60, and the hose 60 is flexible by vulcanization molding. The sex connection pipe 34 is formed.

The flexible connecting pipe 34 formed by the vulcanization molding has outer peripheral clamp grooves 62, 63 formed at the required positions on both outer peripheral portions of the cutting hose 60 in the circumferential direction, and at the same time, one outer peripheral clamp groove 62 is formed. A grip portion 64 that extends radially outward is provided so as to project adjacent to the center of the adjacent axial direction, and is integrally provided. The grip portion 64 forms a handle for operating the flexible connection pipe 34.

The flexible connecting pipe 34 is formed by vulcanizing and molding the cutting hose 60 using the same rubber material as that of the hose, so that the grip portion 64 also serving as a handle and the outer peripheral clamp grooves 62, 63 are integrally provided with a reinforcing structure. It becomes the cooling water hose. The flexible connection pipe 34 is a cooling water hose having heat resistance and pressure resistance, which is reinforced with a reinforcing thread. However, in order to reinforce the flexible connection pipe 34 more firmly, during vulcanization molding, Cutting hose 6
The reinforcing layers 58a and 58b may be formed in a multiple structure by further winding a reinforcing thread around the outer peripheral portion of 0 or winding a reinforcing net. A flexible connecting tube 34 having a multiple reinforcing structure is shown in FIGS. 6 (A) and 6 (B). The flexible connecting pipe 34 has an outer diameter of 27 m, for example.
mφ, inner diameter 16 mmφ, the height of the grip portion 64 from the center of the tube to the tip is 40 mm, and the width and thickness of the legs of the grip portion 64 are 10 mm.
It is molded into mm × 4 mm.

Next, the front and rear engine cylinders 3
A procedure for assembling the flexible connection pipe 34 into the V bank spaces 41 of 5, 33 will be described.

The flexible connecting pipe 34 is connected to the cylinder heads 46F and 46R of the front and rear engine cylinders 35 and 33.
When connecting to the union pipes 51F and 51R protruding from each other, first, the flexible connecting pipe 34 is externally fitted to one of the cylinder heads, for example, the union pipe 51R of the rear cylinder head 46R, and assembled in advance. At this time, the tightening clamps 66 and 68 are roughly installed in advance in the respective outer peripheral clamp grooves 62 and 63 of the flexible connecting pipe 34.
Further, the rear cylinder head 46R is the cylinder block 4
The rear cylinder head 46 while being installed on the 5R
Flexible connection pipe 3 connected to R union pipe 51R
4 tightens the tightening screw 67 of the tightening clamp 66, and is tightened at a predetermined position.

Subsequently, the front cylinder head 46F is in the direction of arrow A in FIG. 7A (the axial direction of the cylinder block).
The cylinder block 45F is moved to the front side and assembled to the front cylinder block 45F. When the cylinder head 46F is assembled, the grip portion 64 of the flexible connecting pipe 34 is operated and lifted up, and the flexible connecting pipe 34 is indicated by a chain line. So that it bends upward. In a state where the flexible connecting pipe 34 is pulled upward and curved, the union pipe 51F is connected to the flexible connecting pipe 3 while moving the front cylinder head 46F in the arrow A direction.
If it is inserted into the flexible connecting pipe 34, the union pipe 51F can be easily inserted into the flexible connecting pipe 34, and the assembling property of the flexible connecting pipe 34 can be improved.

That is, when the front cylinder head 46F is assembled, the union pipe 5 of the front cylinder head 46F is assembled.
At least immediately before 1F comes into contact with the flexible connecting pipe 34, the grip portion 64 is operated to pull up the flexible connecting pipe 34, and the union pipe 51F of the front cylinder head 46F.
Assembling is improved in assembling property. With the flexible connecting pipe 34 inserted in the union pipe 51F, the front cylinder head 46F is connected to the cylinder block 45F.
When lowered and installed, the flexible connecting pipe 34 is inserted to a predetermined position of the front union pipe 51F.

When the front cylinder head 46F is assembled to the cylinder block 45F, the union pipe 5 protruding from the front and rear cylinder heads 46F and 46R.
Since 1F and 51R are axially aligned with each other, the flexible connecting pipe 34 is correctly inserted into the front union pipe 51F to the required position. In this state, by tightening the tightening screw 69 of the tightening clamp 68 temporarily fixed to the outer peripheral clamp groove 62 of the flexible connecting pipe 34 by using a driver not shown, the flexible connecting pipe 34 is attached to the front and rear engines. The cylinders 35 and 33 are assembled smoothly and smoothly in the V bank space 41.

At this time, since the grip portion 64 provided on the flexible connection pipe 34 is integrally formed at a position displaced to one side in the axial direction from the central portion, it is possible to operate the grip portion 64. It is easy to pull the free end side of the flexible connecting pipe 34 upward in the V bank space 41. Therefore,
The assembling property of the flexible connecting pipe 34 is improved, and the flexible connecting pipe 3
The assembling operation of 4 can be performed in a short time without impairing the strength of the flexible connecting pipe 34.

In FIG. 7, the flexible connecting pipe 34
To the rear cylinder head 46R of the union pipe 51 in advance.
An example in which the flexible connecting pipe 34 is assembled to R and then assembled to and connected to the union pipe 51F of the front cylinder head 46F is shown, but the assembly procedure of the flexible connection pipe 34 may be reversed. That is, after being previously assembled to the union pipe 51F of the front cylinder head 46F, the rear cylinder head 4
The 6R union pipe 51R may be assembled. In this case, the front cylinder head 46F is first assembled to the cylinder block 45F, while the grip portion 64 of the flexible connection pipe 34 is attached to the rear cylinder head 46F.
The flexible connection pipe 34 is provided so as to be located on the R side. This is to facilitate the pulling operation of the flexible connecting pipe 34.

In the embodiment of the present invention, the flexible connecting pipe 34 is formed by vulcanizing and molding the outer peripheral side of the cutting hose 60 obtained by cutting the reinforcing hose 55 into a required length with the same material. Secondary molding processing such as vulcanization molding may be performed using a resin material different from that of the reinforcing hose 55. In this case, there is also a method of preliminarily adhering and integrating a post-applied resin material to the outer peripheral side of the cutting hose 60, and then vulcanizing and molding by secondary molding.

The flexible connecting pipe 34 shown in FIGS. 5A, 5B and 5C is obtained by cutting the reinforcing pipe 55, which is an extruded product or a pultruded product, for each required length. An example of the cooling water hose in which the pipe 60 is secondarily formed by injection pipe molding using a split mold and the outer peripheral clamp grooves 62 and 63 and the grip portion 64 as a handle are integrally formed is shown in FIG. The flexible connecting pipe 70 shown in FIG. 8 may be obtained from the cutting pipe 60 shown in FIG.

This flexible connecting pipe 70 has an outer peripheral clamp groove 7
2, and an outer peripheral flange 73 is integrally formed on the axial center side of the outer peripheral clamp groove 72. The outer peripheral clamp groove 72 holds the tightening clamp 74 at an optimum position, and prevents the flexible connecting pipe 70 from coming off or coming off from the union pipe 51 and water leakage.

The outer peripheral flange 73 of the flexible connecting pipe 70 is
When the flexible connecting pipe 70 is assembled to the union pipe 51, it is provided to improve the assembling property. The flexible connecting pipe 70 is made of the reinforcing pipe 55, but the reinforcing thread is difficult to extend, and when inserting the flexible connecting pipe 70 into the union pipe 51, a large force is required in the axial direction.

However, it is difficult to attach the outer peripheral flange 73 to the cutting pipe 60 of the reinforcing pipe 55 which is an extrusion molded product or a pultrusion molded product. In FIG. 8, the outer peripheral clamp groove 72 and the outer peripheral flange 73 can be integrally provided on the outer peripheral side of the flexible connecting pipe 70 by applying the secondary molding process to the cutting pipe 60. The outer peripheral flange 7 is attached to the flexible connecting pipe 70.
By providing 3 and the outer peripheral clamp groove 72, the workability of assembling the flexible connecting pipe 70 is significantly improved and the quality is stabilized.

In the embodiment of the present invention, the cylinder head is provided with the union pipe communicating with the water jacket. However, the cylinder block is provided with the union pipe communicating with the water jacket, and the union pipes are connected to each other. May be connected by a flexible connecting pipe.

Further, although the flexible connecting pipe has an example in which the grip portion is formed on the inner side in the axial direction of the outer peripheral clamp groove, the grip portion is formed on the outer side in the axial direction of the outer peripheral clamp groove, that is, on the end side of the connecting pipe. May be.

[0048]

In the cooling structure for the water-cooled V-type engine and the method for assembling the flexible connecting pipe according to the present invention, the flexible connecting pipe is integrally provided with the outer peripheral clamp groove and the grip portion which also serves as a handle. When assembling the flexible connecting pipes arranged in the V bank space of the front and rear engine cylinders, the assembling workability is improved, and the flexible connecting pipes can be stably and easily attached with high positioning accuracy. it can.

Further, since the flexible connecting pipe is integrally formed with the grip portion and the outer peripheral clamp groove by the secondary forming process of the reinforcing pipe, the assembling property and the assembling workability are improved, and the strength of the connecting pipe is improved. It can be assembled stably and easily without damaging it.Furthermore, since the tightening clamp is positioned and tightened in the outer peripheral clamp groove, the tightening clamp can be positioned accurately and easily. Even if the engine is vibrated, the flexible connecting pipe can be stably clamped without being displaced in the axial direction or coming off, and the occurrence of water leakage can be prevented in advance.

[Brief description of drawings]

FIG. 1 is a left side view of a motorcycle including a cooling structure for a water-cooled V-type engine according to the present invention.

FIG. 2 is a plan view of the motorcycle shown in FIG.

FIG. 3 is a side view showing an embodiment of a cooling structure for a water-cooled V-type engine according to the present invention, showing the water-cooled V-type engine mounted on the motorcycle shown in FIG.

FIG. 4 is a side view showing a cylinder head portion of a water-cooled V-type engine showing an embodiment of a cooling structure for the water-cooled V-type engine according to the present invention.

5A to 5C are diagrams showing respective steps of manufacturing a flexible connecting pipe from a long reinforcing pipe.

6A is a vertical cross-sectional view of a flexible connecting pipe, and FIG. 6B is a plane cross-sectional view taken along the line BB of FIG. 6A.

7A and 7B are views showing an assembling procedure for assembling a flexible connecting pipe between cylinder heads of a water-cooled V-type engine.

FIG. 8 is a view showing a modified example of the flexible connecting pipe.

[Explanation of symbols]

10 motorcycles 11 body frame 12 head pipe 13 Tank rail 14 down frame 15 rear frame 17 front wheels 18 Front fork assembly 19 handlebars 20 center frame 21 swing arm 22 rear wheel 25 fuel tank 26 V engine 27 Shaft drive mechanism 28 headlamps 29 Driving seat 30 radiator 31 Water Inlet Horse 32 water pump 33 Rear engine cylinder 34 Flexible connection pipe (cooling water hose) 35 front engine cylinder 36 Cooling water circulation system 40 crankcase 41 V bank space 43 Engine intake system 44 carburetor 45F, 45R cylinder block 46F, 46R cylinder head 47F, 47R Cylinder head cover 48 stud bolt 50F, 50R Water jacket 51, 51F, 51R Union pipe 55 Reinforcing hose 56 Inner tube rubber 57 Cover rubber (outer tube rubber) 58 Reinforcing layer 60 cutting hose 62, 63 outer peripheral clamp groove 64 Grip (handle) 66,68 Tightening clamp 67,69 Tightening screw 70 Flexible connection tube

Claims (6)

[Claims] 1. A water-cooled V-type engine in which front and rear engine cylinders are arranged in a V shape in a vehicle side view, wherein a water jacket of the front engine cylinder and a rear engine are provided in a V bank space formed by the front and rear engine cylinders. A flexible connecting pipe that connects with the water jacket of the cylinder is provided.This flexible connecting pipe has a reinforcing structure in which a reinforcing member is embedded, and a grip portion that also serves as a handle is integrally projected on the outer peripheral portion. A water-cooled V-type engine cooling structure. 2. An outer peripheral clamp groove is integrally formed on both end sides of the flexible connecting pipe, and the grip portion is integrally formed on an axial center side adjacent to one of the outer peripheral clamp grooves. The cooling structure for a water-cooled V-type engine according to claim 1. 3. The flexible connecting pipe is configured such that a flexible reinforcing hose having a reinforcing member embedded therein is cut into pieces each having a required length, and an outer peripheral portion of the cut hose is subjected to a secondary molding process to form an outer peripheral clamp groove. The water-cooled V according to claim 1 or 2, further comprising:
Type engine cooling structure. 4. The flexible connecting pipe is formed by cutting a flexible reinforcing hose in which a reinforcing member is embedded into pieces each having a required length, and subjecting an outer peripheral portion of the cut hose to a secondary molding process to form an outer peripheral clamp groove. The cooling structure for a water-cooled V-type engine according to claim 1, further comprising: 5. A union pipe communicating with a water jacket is projectingly provided on cylinder heads of the front and rear engine cylinders, and the union pipes are arranged so as to face a V bank space, and the union pipes are flexible. 2. The cooling structure for a water-cooled V-type engine according to claim 1, wherein the connecting pipes are connected to each other, and tightening clamps are attached to the outer peripheral clamp grooves formed on both end sides of the flexible connecting pipe and tightened. 6. One of the front and rear engine cylinders is mounted on a crankcase with the flexible connecting pipe being attached to a union pipe protruding from a cylinder head of one of the engine cylinders, After that, when the cylinder head of the other engine cylinder is assembled, the grip portion of the flexible connecting pipe can be operated at least immediately before the union pipe protruding from the other cylinder head comes into contact with the flexible connecting pipe. With the free end side of the flexible connecting pipe being pulled up and the free end side of the flexible connecting pipe being pulled up, the cylinder head is moved in the axial direction of the cylinder block while being flexible to the union pipe of the cylinder head. It can be done with the connecting pipe assembled and the other cylinder head installed on the cylinder block on the crankcase. The method of assembling the flexible connecting tube used the flexible connecting pipe by tightening the tightening clamp of sexual connection tube in a water-cooled V-type engine, characterized in that provided in the V bank space.