JPH1178490A - Heat generator for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obviate any local heat deterioration of a viscous fluid, and simulta neously to aim at the quality upgrade of a rotor and the stabilization of mold ing, in a vehiclar heat generator. SOLUTION: Plural pieces of guide grooves 20 are formed in each end face of a rotor 14. A tilt is imparted to a side wall 22 connecting a bottom wall 21 and an opening end part 23 of these guide grooves 20 like that. Since the side wall 22 has the tilt of an angle X on a virtual plane P vertical to the bottom wall 21, a distance between both side walls 22 is formed so as to be gradually spread toward the opening end part 23 (L1>L2). Thus, as the tilt is imparted to each side wall 22 of the guide grooves 20, in the case where the guide grooves 20 are formed by press working, a groove depth D enough to urge the circulation flow of a viscous fluid is securable while avoiding any strain being concentrated on the opening end part 23.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention includes a heating chamber and a heat radiating chamber partitioned in a housing, and a rotor operatively connected to a drive shaft is rotated in a heating chamber containing a viscous fluid to shear the viscous fluid. The present invention relates to a vehicle heat generator that generates heat based on an action and exchanges the heat with a circulating fluid flowing through a radiating chamber.

[0002]

2. Description of the Related Art As a heating device for a vehicle, heat cooling water used for cooling a water-cooled engine is supplied to a heater core in a duct, and air heated by the heater core is sent into the vehicle interior to heat the vehicle interior. A hot water heating device for a vehicle is generally used.

[0003] However, in a vehicle such as a diesel engine vehicle or a lean burn engine vehicle that generates a relatively small amount of heat from the engine and cannot sufficiently heat the engine cooling water, the heat supplied to the heater core is not sufficient. It is difficult to maintain the temperature of the cooling water at a predetermined water temperature (for example, 80 ° C.), and there is a disadvantage that the heating capacity in the vehicle compartment tends to be insufficient.

[0004] For the purpose of overcoming this drawback, it has been proposed to provide a vehicle heat generator for heating the engine cooling water in a circuit for circulating the engine cooling water. Such a vehicle heat generator includes a heat generating chamber and a water jacket (heat radiating chamber) partitioned in a housing thereof, and a drive shaft and a rotor that are rotationally driven by the power of an engine. The rotor shears the viscous fluid (for example, high-viscosity silicone oil) contained in the heat generating chamber to generate heat based on fluid friction, and heats the circulating fluid (engine cooling water) flowing through the water jacket. ing.

[0005]

The temperature of the viscous fluid sealed in the heating chamber tends to increase as the engine speed increases, regardless of the temperature of the circulating fluid flowing through the circulation circuit. In particular, since the shearing speed of the rotor is higher in the peripheral area of the heat generating chamber than in the central area of the heat generating chamber, the temperature of the viscous fluid tends to be higher in the peripheral area. When a highly viscous silicone oil is used as a viscous fluid, the temperature of the oil itself may be, for example, 25
When the temperature exceeds 0 ° C., mechanical deterioration due to thermal deterioration and shearing of the oil tends to occur. Therefore, how to prevent local thermal degradation of the viscous fluid, especially in the peripheral region of the heat generating chamber, is one of the main technical issues in this type of heat generator.

[0006] It is also a major task for practical use to improve the quality of a rotor processed into a special shape and to stabilize molding in order to prevent local thermal deterioration of a viscous fluid. .

SUMMARY OF THE INVENTION It is an object of the present invention to prevent local thermal deterioration of a viscous fluid in a heating chamber in a heat generator for a vehicle, to improve the quality of a rotor housed in the heating chamber and to stabilize molding. It is to plan.

[0008]

According to a first aspect of the present invention, there is provided a heat generating chamber and a heat radiating chamber partitioned in a housing, and a viscous fluid contained in the heat generating chamber is rotatably provided in the heat generating chamber. A heat generator for a vehicle that generates heat by shearing with a rotor that has been subjected to heat exchange with the circulating fluid flowing through the radiating chamber, the shearing action surface of the rotor extends from a central region to a peripheral region of the rotor. The gist of the invention is that a guide groove extending toward the guide groove is formed, and a sidewall of the guide groove that connects a bottom wall of the guide groove and an open end is inclined.

According to this heat generator for a vehicle, since the side wall of the guide groove is inclined, the angle between the side wall and the bottom wall is obtuse, and the distance between both side walls is the distance from the bottom wall to the open end. It is formed so as to gradually spread toward the part. This guide groove
The rotation of the rotor guides the viscous fluid subjected to the shearing action in the heat generating chamber, and pushes the viscous fluid from the central region to the peripheral region of the heat generating chamber. Therefore, a circulating flow of the viscous fluid occurs between the central region and the peripheral region of the heat generating chamber, and as a result, local deterioration due to overheating of the viscous fluid is prevented.

When the guide groove is formed into the rotor by press working, it is necessary to prepare a press die having a ridge corresponding to the guide groove. For example, if the guide groove is formed in a rectangular cross section, the guide groove is formed in the rotor by a press die having a ridge having a right-angled corner, and as a result, distortion concentrates on the open end of the guide groove. This distortion is
This may cause an undesired bulge on a part of the shearing action surface of the rotor, which not only makes it impossible to maintain a constant clearance between the wall surface of the heating chamber and the end face of the rotor, but also worsens the contact of the shearing action surface with the wall surface of the heating chamber. There is also a risk of doing so. In contrast, the guide groove in the present invention is:
Since the side wall is inclined, a ridge without a right-angled corner is provided on the press die. By forming the guide groove with such a press die, it is possible to avoid the possibility of strain being concentrated at the opening end of the guide groove during press working, and to prevent the mold abrasion caused by the continuous use of the press die, thereby providing a stable guide groove. Achieve molding.

According to a second aspect of the present invention, in the vehicle heat generator according to the first aspect, the guide groove on the shearing action surface of the rotor is arranged in a direction opposite to a rotor rotation direction with respect to a radial direction of the rotor. It is characterized by extending backward.

According to this configuration, when the rotor rotates, the guide groove actively pushes the viscous fluid toward the peripheral area of the heat generating chamber. Therefore, a smooth circulation flow of the viscous fluid in the heating chamber is realized. The viscous fluid pushed to the peripheral area returns from the peripheral area to the central area along the wall surface of the heating chamber facing the shearing surface of the rotor.

According to a third aspect of the present invention, in the vehicle heat generator according to the first or second aspect, the inclination angle given to the side wall of the guide groove is 30 degrees with respect to a plane perpendicular to the bottom wall. ~
It is characterized in that it is set in a range of 70 degrees.

[0014] The side wall of the guide groove is 3 ° with respect to a plane perpendicular to the bottom wall.
If the angle is less than 0 degrees, when the guide groove is provided to the rotor by press working, distortion tends to concentrate around the opening end of the guide groove, and it is difficult to obtain the effects of the present invention. On the other hand, when the side wall of the guide groove exceeds 70 degrees with respect to a plane perpendicular to the bottom wall,
When the rotor rotates, the effect of the guide groove as a means for transferring the viscous fluid in the heat generating chamber to the peripheral region is reduced. Therefore, by sloping the side wall of the guide groove in the range of 30 degrees to 70 degrees with respect to the plane perpendicular to the bottom wall, the circulation of the viscous fluid can be prevented while avoiding the possibility of strain being concentrated at the opening end during the press working. Flow can be realized.

According to a fourth aspect of the present invention, in the vehicle heat generator according to any one of the first to third aspects, the depth of the guide groove is equal to the width (W) of the rotor. The ratio (D / W) of the depth (D) is set to 1/10 or more.

If the ratio of the depth of the guide groove to the width of the rotor is less than 1/10, the guide groove does not function sufficiently as a means for transferring the viscous fluid in the heat generating chamber to the peripheral region when the rotor rotates. Therefore, it is not possible to sufficiently bring out the temperature uniformity of the viscous fluid in the heating chamber based on the circulating flow of the viscous fluid. The ratio of the depth of the guide groove to the width of the rotor is 1
By making it / 10 or more, the temperature of the viscous fluid can be reduced. On the other hand, when the ratio of the depth of the guide groove to the width of the rotor exceeds 3/10, the strength of the rotor is affected. Therefore, the preferred range of the ratio of the depth of the guide groove to the width of the rotor is 1/10 to 3/10.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

As shown in FIG. 1, the outer shell of the vehicle heat generator is constituted by a front housing main body 1 and a rear housing main body 2. The front housing body 1 has a hollow cylindrical boss 1a protruding forward (leftward in the figure).
And a cylindrical portion 1b that extends largely from the base end of the boss portion 1a toward the rear in a bowl shape. The rear housing body 2 has a lid shape that covers the opening side of the cylindrical portion 1b. The front housing body 1 and the rear housing body 2 are fastened by a plurality of bolts 3 while a pair of front partition plates 5 and rear partition plates 6 are provided inside the cylindrical portion 1b of the front housing body 1. I have.

Front compartment plate 5 and rear compartment plate 6
Have annular rim portions 5a, 6a on the outer periphery thereof. By sandwiching the rim portions 5a, 6a between the opposing wall surfaces of the mutually connected housing bodies 1, 2, both partition plates 5, 5 are provided in the both housing bodies 1, 2.
6 is immovably stored. The rear end face 5d of the front partition plate 5 has a concave shape with respect to the rim portion 5a, and the rear end face 5d of the front partition plate 5 and the rear partition face 5 A heating chamber 7 is formed between the heating chamber 6 and the front end face 6f.

As described above, the housing of the vehicle heat generator includes the front housing body 1, the rear housing body 2, the front partition plate 5, and the rear partition plate 6. The components of these housings are made of aluminum or aluminum alloy.

On the front end side, the front partition plate 5 has a support cylinder 5b formed at the center thereof and a plurality of concentric arc-shaped arcs extending in the circumferential direction along the outside of the support cylinder 5b. And a guide fin 5c. The front partition plate 5 is fitted into the front housing main body 1 such that a part of the support cylinder 5b is in close contact with the inner wall of the front housing main body 1. As a result, between the inner wall of the front housing main body 1 and the main body of the front partition plate 5, an annular front water jacket 8 as a heat radiating chamber adjacent to the front side of the heat generating chamber 7 is partitioned. . In the front water jacket 8, the rim 5a, the support cylinder 5b, and the guide fins 5c serve as guide walls for guiding the flow of circulating water as a circulating fluid, and the circulation of circulating water in the front-side radiation chamber. Set the route.

The rear partition plate 6 has, at the rear end side, a tubular portion 6b formed at the center thereof and a tubular portion 6b
And a plurality of guide fins 6c formed in a concentric arc shape extending in the circumferential direction along the outside. When the rear partition plate 6 is fitted into the front housing main body 1 together with the front partition plate 5, the cylindrical portion 6 b of the rear partition plate 6 is in close contact with the annular wall 2 a of the rear housing main body 2. As a result, between the rear housing main body 2 and the main body of the rear partition plate 6, an annular rear water jacket 9 as a heat dissipation chamber adjacent to the rear side of the heat generating chamber 7 and a position inside the cylindrical portion 6b are provided. A sub oil chamber 10 is defined as a storage chamber. In the rear water jacket 9, the rim portion 6a, the cylindrical portion 6b, and the guide fin 6 are provided.
c serves as a guide wall for guiding the flow of the circulating water as the circulating fluid, and sets the circulation path of the circulating water in the rear heat dissipation chamber.

In addition, a water inlet port (not shown in the drawings) for circulating water from a heating circuit (not shown) provided in the vehicle to each of the front and rear water jackets 8 and 9 is provided in a peripheral wall portion of the front housing body 1. ) And a water outlet port (not shown) for sending circulating water from the front and rear water jackets 8 and 9 to the heating circuit.

As shown in FIG. 1, the front housing body 1
A drive shaft 13 is rotatably supported by the front partition plate 5 via bearings 11 and 12. Bearing 12
Is a bearing device with a seal, and the front partition plate 5
, Between the inner peripheral surface of the support cylindrical portion 5b and the outer peripheral surface of the drive shaft 13 to seal the front of the heat generating chamber 7.

A disk-shaped rotor 14 housed in the heat generating chamber 7 is press-fitted and fixed to the rear end of the drive shaft 13 so as to be integrally rotatable. The front and rear end surfaces and the outer peripheral edge of the rotor 14 and the inner wall surface of the heat generating chamber 7 opposed thereto (that is, the rear end surface 5 d of the front partition plate 5 and the front end surface 6 of the rear partition plate 6).
f) a small clearance is formed between
For example, it is in the range of tens to hundreds of microns (μm).

An auxiliary oil chamber 10 as a storage chamber is provided in a region surrounded by the cylindrical portion 6b of the rear partition plate 6 and the rear end wall of the rear housing body 2. The rear partition plate 6 has an upper communication hole 6d as a recovery passage and a lower communication hole 6e as a supply passage penetrating the main body part back and forth. The heating chamber 7 and the sub oil chamber 10
They communicate with each other through the upper and lower communication holes 6d and 6e. The communication cross-sectional area of the lower communication hole 6e is
It is set larger than that of d.

The heat generating chamber 7 and the sub oil chamber 10 communicating with each other via the upper and lower communication holes 6d and 6e form a liquid-tight internal space in the heater housing. This internal space is filled with a required amount of silicone oil as a viscous fluid. This silicone oil has viscoelasticity. The amount of the silicone oil is determined so that its filling factor at normal temperature is 50 to 80% of the free space in the internal space. When the rotor 14 rotates, silicone oil is supplied from the auxiliary oil chamber 10 to the heat generating chamber 7 through the lower communication hole 6e, and the temperature increases from the heat generating chamber 7 to the auxiliary oil chamber 10 through the upper communication hole 6d. Silicone oil is collected. Therefore, replacement circulation of the silicone oil may occur between the heat generating chamber 7 and the sub oil chamber 10. When filling with silicone oil,
The upper communication hole 6d is located above the liquid level of the silicone oil stored in the sub oil chamber 10, and is connected to the lower communication hole 6d.
e is located below the liquid level.

A pulley 16 is fixed to the front end of the drive shaft 13 by a bolt 15. The pulley 16 is drivingly connected to an engine E of a vehicle as an external drive source via a V-belt 17 wound around an outer peripheral portion thereof.

Now, in the vehicle heat generator of this embodiment,
As shown in FIG. 2, a plurality of rotor communication holes 14a are formed near the periphery of the rotor 14 and penetrate in the front-rear direction. These rotor communication holes 14 a are arranged at equal angular intervals around the drive shaft 13 at positions equidistant from the center axis of the drive shaft 13. A plurality of guide grooves 20 (12 in this embodiment) are formed on each of the front and rear end surfaces of the rotor 14 so as to extend from the central region to the peripheral region. The guide grooves 20 surround the drive shaft 13 and are arranged at equal angular intervals. Furthermore, each guide groove 20
Is provided so as to be inclined backward in the direction opposite to the rotation direction of the rotor 14 with respect to the radial direction of the rotor 14. That is, each guide groove 20 is inclined such that the end near the center is on the front side and the peripheral end is on the rear side in the rotation direction of the rotor 14. This inclination acts as an oil transfer means for sending out the silicone oil in contact with the front and rear end surfaces of the rotor 14 from the central region to the peripheral region when the rotor 14 rotates at a high speed. Supported. This oil circulation will be described later in detail.
Each guide groove 20 is provided by press working on each end face of the rotor 14.

FIG. 3 shows a cross-sectional shape of the guide groove 20.
As shown in FIG. 3, each guide groove 20 opened on each end face side.
Is formed by a bottom wall 21 and two side walls 22 erected on both sides thereof. The bottom wall 21 is formed in a plane parallel to the end face of the rotor 14, and each side wall 22 of the guide groove 20 is
It extends with an inclination of an angle X with respect to a virtual plane P perpendicular to the bottom wall 21. The preferred range of this angle X is 3
0 degrees to 70 degrees. Therefore, the angle between the bottom wall 21 and the side wall 22 is shown as (X + 90) (that is, obtuse angle), and the preferable range is 120 degrees to 160 degrees. in this way,
Since the side wall 22 is inclined, the distance L1 between the side walls 22 at the opening end 23 is larger than the distance L2 between the side walls 22 at the end of the bottom wall 21 (L1
> L2). Therefore, the width between the side walls 22 is equal to the width of the open end 23.
It gradually increases toward.

An experiment is conducted to examine the correlation between the depth D of the guide groove 20 and the oil temperature T in the heat generating chamber 7. FIG.
Indicates the result. The vertical axis in FIG. 4 is the oil temperature T in the heat generating chamber 7, and the horizontal axis in FIG. 4 is the ratio of the depth D of the guide groove 20 to the thickness W of the rotor 14. The data in FIG. 4 is obtained when the rotor thickness W is 3 mm and the rotation speed of the rotor 14 is 3350 rpm.

When the rotor 14 rotates, each of the guide grooves 20 functions as a viscous fluid transfer means.
Therefore, the oil temperature difference between the central region and the peripheral region tends to be corrected and made uniform, so that the oil temperature is reduced as a whole. As can be seen from the graph of FIG. 4, in order to sufficiently bring out the effect of reducing the oil temperature, the ratio of the depth of each guide groove 20 to the width of the rotor 14 is set to 1/1.
It is preferable to be set to 0 or more.

Next, the operation of the vehicle heat generator of this embodiment will be described. Before starting the engine E, that is, the drive shaft 1
At the time of stop of 3, the liquid level of the silicone oil (viscous fluid) in the heat generating chamber 7 and the sub oil chamber 10 is equal. Therefore, when the drive shaft 13 is started, the contact area of the rotor 14 with the viscous fluid is small, and the pulley 16, the drive shaft 13 and the rotor 14 can be started with a small torque. The drive shaft 13 is driven by the driving force of the engine E through the pulley 16.
With the rotation of the rotor 14 together, the silicone oil staying in the sub oil chamber 10 causes its own weight and the oil drawing action of the rotor 14 caused by the viscosity of the silicone oil to cause the heat generation chamber to pass through the lower communication hole 6e. 7. In the heating chamber 7, the inner wall surface of the heating chamber 7 and the rotor 1
Silicone oil quickly spreads over the slight clearance between the four. Such silicone oil is sheared in the gap between the inner wall surface of the heat generating chamber 7 and each end surface (shearing surface) of the rotor 14 to generate heat. Heat generated in the heat generating chamber 7 by shearing by the rotor 14 is exchanged with circulating water flowing through the front and rear water jackets 8 and 9 through the partition plates 5 and 6. The heated circulating water is supplied to a vehicle interior for heating or the like via a heating circuit (not shown).

The silicone oil subjected to the shearing action in the heating chamber 7 is collected in the sub oil chamber 10 through the upper communication hole 6d. In this way, the silicone oil is exchanged and circulated between the heat generating chamber 7 and the sub oil chamber 10. The recovered silicone oil stays in the sub-oil chamber 10 for a certain time according to the cycle time of the replacement circulation.
Within this fixed time, the silicone oil is removed from heat and is protected from deterioration due to long-term heat retention.

According to the vehicle heat generator, the rotor 14
When the rotor 14 is driven, the inner wall surface of the heat generating chamber 7 and the rotor 14
In the area of clearance between the shearing surface and the surface, a flow of silicone oil along the radial direction of the rotor 14 occurs. In particular, when the rotor rotates at high speed, as shown in FIG.
While the silicone oil near both end surfaces of the rotor 14 tends to move toward the peripheral area of the heating chamber 7 while being guided by the guide grooves 20, the silicone oil in the peripheral area of the heating chamber 7 is pushed back by the inner wall surface of the heating chamber 7. Move to the center area to be As described above, when the rotor 14 rotates at a high speed, the silicone oil is actively circulated in the radial direction of the rotor 14 in the clearance region in the heat generating chamber 7. The presence of the guide groove 20 facilitates the circulation flow in the radial direction of the rotor 14.

The guide groove 20 is provided to the rotor 14 by press working. At this time, for example, as shown in FIG. 6, if the guide groove 20 is provided in a rectangular shape in cross section (that is, the side wall 22 is perpendicular to the bottom wall 21), a plurality of press dies are formed during processing. Since the ridge is pushed into each end face of the rotor 14, distortion concentrates around the open end 23 of the guide groove 20. As a result, a part of the rotor 14 rises outside the expected end face around the open end 23,
If the clearance between the inner wall surface of the heat generating chamber 7 and each end face of the rotor 14 is locally reduced, or worsened, the bulge of the opening end 23 comes into contact with the inner wall surface of the heat generating chamber 7. On the other hand, if the depth of the guide groove 20 is reduced in order to further reduce the bulge of the opening end 23, the function as the guide groove 20 cannot be performed. On the other hand, in this embodiment, each side wall 22 of the guide groove 20 is separated from the bottom wall 21 by the open end 2.
3, the strain does not concentrate on the open end 23 during pressing.
Therefore, the guide groove 20 can be press-worked while ensuring a depth sufficient to fulfill a sufficient function as the guide groove 20.

If the guide groove 20 is provided with a rectangular cross section, when the guide groove 20 is formed in the rotor 14 by press working, mold wear accompanying the continuous use of the press die is likely to occur. That is, in order to form a guide groove 20 having a rectangular cross section as shown in FIG. 6, a convex ridge corresponding to the guide groove 20 must be prepared in the press die. Since the side wall 22 of the guide groove 20 is perpendicular to the bottom wall 21 on this ridge, a right angle corner portion corresponding to this vertical relationship is required. When a press die having such a ridge is used continuously, the right-angled corners of the ridge are particularly easily worn. If the guide groove 20 is formed while the mold wear is progressing, the shape of the guide groove 20 will be broken, causing inconveniences such as a variation in the shape of each guide groove 20. However, in the present embodiment, since the side wall 22 of the guide groove 20 is provided with an inclination from the bottom wall 21 to the opening end 23, a right-angle corner portion is formed on a ridge of a press die for forming the guide groove 20 portion. No need to form. Therefore, there is no danger that the ridges of the press die will wear out, and the guide groove 20 is supplied to the rotor 14 stably.

The vehicle heat generator of this embodiment has the following advantages. When the rotor 14 rotates at a high speed, the silicone oil is guided by the guide groove 20 provided in the rotor 14 and is pushed to the peripheral area of the heat generating chamber 7. As a result, the viscous fluid flows between the peripheral area of the heat generating chamber 7 and the central area. Circulating flow occurs. Due to this circulation flow, the oil temperature T in the heat generating chamber 7 tends to be uniform. For this reason, a situation in which the viscous fluid subjected to the shearing action in the peripheral area of the heat generating chamber 7 locally deteriorates due to overheating can be prevented. In addition, since the oil temperature T is made uniform, heat exchange with the circulating water flowing through the water jackets 8 and 9 can be stabilized.

Each guide groove 20 provided to the rotor 14
Is provided so that both side walls 22 extend from the bottom wall 21 to the opening end 23 (L1> L2). For this reason,
When the guide groove 20 is formed by press working, it is possible to secure the groove depth D sufficient to promote the circulating flow of the viscous fluid, while avoiding the possibility that strain is concentrated on the opening end 23. Therefore, the minute clearance between the inner wall surface of the heat generating chamber 7 and the end face of the rotor 14 can be kept constant, and the circulating flow of the silicone oil between the peripheral area and the central area of the heat generating chamber 7 can be surely and smoothly performed. Things.

The side wall 22 of the guide groove 20 is configured to expand from the bottom wall 21 to the open end 23.
When the guide groove 20 is formed on the end face of the rotor 14 by press working, a press die having a plurality of ridges without a right-angled corner portion corresponding to the shape of the guide groove 20 can be used. For this reason, it is possible to prevent mold wear of the ridge that occurs when the guide groove 20 has a rectangular cross section. Accordingly, the durability of the press device can be improved, and there is no possibility that the shape of each guide groove 20 varies, and the same-shaped guide groove 20 can be stably formed on the end face of the rotor 14. .

(Modification) The above embodiment can be modified and embodied as follows. ○ The cross-sectional shape of the guide groove 20 may be changed. For example,
As shown in FIG. 7A, the guide groove 20 may have a shape in which the wall surface from the bottom wall 21 to the side wall 22 is rounded, or as shown in FIG. Groove 2
0 may be adopted. The shape in FIG. 7B is (L2 ≒
0 and L1> L2). Even with such a configuration, the same effect as that of the above embodiment can be obtained, and since the portion protruding from the inner wall surface of the guide groove 20 is eliminated, die wear of the press die can be reliably prevented. When the cross-sectional shape of the guide groove 20 is changed, it is necessary to secure a depth equal to or more than a predetermined value, and to provide a slope that expands at a predetermined angle from the bottom wall or the bottom to the opening. We need to respond.

(Definition of terms) "Viscous fluid" means any medium that generates heat based on fluid friction under the shearing action of a rotor, and is limited to high-viscosity liquids and semi-fluids. Of course, it is not limited to silicone oil.

[0043]

As described in detail above, according to the vehicle heat generator described in the claims, local thermal deterioration of the viscous fluid in the heat generating chamber is prevented beforehand and housed in the heat generating chamber. There is an effect that the quality of the rotor can be improved and the rotor can be stably supplied.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an outline of a vehicle heat generator according to an embodiment.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a sectional view taken along line BB in FIG. 2;

FIG. 4 is a graph showing an oil temperature reduction effect of a guide groove.

FIG. 5 is an explanatory diagram showing a flow direction of a viscous fluid during high-speed rotation of a rotor.

FIG. 6 is a sectional view corresponding to FIG. 3, showing a distortion generated at an opening end in a guide groove having a rectangular cross section (comparative example).

FIG. 7 is a cross-sectional view corresponding to FIG. 3 according to a modified example, where (a) shows a case where roundness is provided from the bottom wall to the side wall of the guide groove;
(B) shows the case where it is formed in a semicircular cross section.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Front housing main body, 2 ... Rear housing main body, 5
... front compartment plate, 6 ... rear compartment plate (1, 2,
5, 6 constitute a housing), 7: a heat generating chamber, 8: a front water jacket as a heat radiating chamber, 9: a rear water jacket as a heat radiating chamber, 14: rotor, 20: guide groove, 21: bottom wall, 22 ... side wall, 23 ... open end, X ...
Inclination angle, W: width of rotor, D: depth of guide groove.

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Tatsuya Hirose 2-1-1, Toyota-cho, Kariya-shi, Aichi Prefecture Inside Toyota Industries Corporation

Claims (4)

[Claims] 1. A heat generating chamber and a heat radiating chamber partitioned in a housing, wherein a viscous fluid contained in the heat generating chamber is sheared by a rotor rotatably provided in the heat generating chamber to generate heat, In the heat generator for a vehicle for exchanging the heat with the circulating fluid flowing through the heat radiating chamber, a guide groove extending from a central region to a peripheral region of the rotor is formed on a shearing surface of the rotor. A heat generator for a vehicle, wherein a slope is given to a side wall of the guide groove connecting a bottom wall of the groove and an opening end. 2. A guide groove on a shearing surface of the rotor,
2. The fuel cell system according to claim 1, wherein the rotor extends rearward in a direction opposite to a rotor rotation direction with respect to a radial direction of the rotor.
4. The heat generator for a vehicle according to claim 1. 3. The heat for a vehicle according to claim 1, wherein an inclination angle given to a side wall of the guide groove is set in a range of 30 degrees to 70 degrees with respect to a plane perpendicular to the bottom wall. Generator. 4. The depth of the guide groove is a ratio (D / D) of a depth (D) of the guide groove to a width (W) of the rotor.
The heat generator for a vehicle according to any one of claims 1 to 3, wherein W) is set to be 1/10 or more.