JPH1068403A - Vehicle hydraulic power unit - Google Patents

Abstract

(57) Abstract: A space between an outer shell 1 and an inner shell 2 is formed in a heating chamber 3 for flowing a cooling medium for cooling a power source mounted on a vehicle, and a gas-liquid change in the inner shell 2 is provided. In a vehicular hydraulic power source device, which is configured in a pressurized chamber 4 in which a medium to be pressurized is sealed and in which the oil chamber 7 is compressed by the vapor pressure of the medium in the pressurized chamber 4 to generate a hydraulic pressure, the liquid phase medium is efficiently used. Make it possible to evaporate well by heating. SOLUTION: A bottom upper plate 9 is provided at the bottom of a pressurizing chamber 4 with a space between the bottom wall 2a of an inner shell 2 and the bottom wall 2a. A gap between the peripheral wall 2b of the inner shell 2 and the bottom plate 9 is ensured around the bottom plate 9 so that droplets of the medium are scattered upward from the gap below the bottom plate 9 as the medium boils. To Also, the protrusion 11 is provided on the inner surface of the peripheral wall 2b to increase the heat transfer area.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle hydraulic power source device for generating a hydraulic pressure to be supplied to a hydraulic actuator mounted on a vehicle.

[0002]

2. Description of the Related Art Conventionally, it is known to mount a hydraulic actuator such as a hydraulic cylinder for adjusting the vehicle height or a hydraulic cylinder for steering a rear wheel in a four-wheel steering vehicle on a vehicle. An electric motor or a hydraulic pump driven by an engine is provided as a hydraulic source.

[0003]

In the above conventional example, energy consumption increases due to the use of a hydraulic pump.
This is a problem in improving fuel economy. Therefore, development of a device that can generate hydraulic pressure by using waste heat of a power source mounted on a vehicle has been desired as a vehicle hydraulic power source device that replaces a hydraulic pump. Such a vehicle hydraulic power source device includes an outer shell and an inner shell that are vertically long, and allows a space between the outer shell and the inner shell to flow a coolant such as water or oil for cooling a power source mounted on the vehicle. In addition to the heating chamber, the inner shell is configured as a pressurized chamber in which a medium that changes gas-liquid is sealed, and an oil chamber that is compressed by the vapor pressure of the medium in the pressurized chamber is provided. It is conceivable that the hydraulic pressure is generated by the following. In this case, it is required that the medium in the pressurized chamber can be efficiently heated and vaporized by the heat of the refrigerant flowing in the heated chamber. An object of the present invention is to provide a vehicle hydraulic power source device utilizing waste heat, which satisfies such a demand.

[0004]

Means for Solving the Problems In order to solve the above problems,
The present invention includes an outer shell and an inner shell that are vertically elongated, and a space between the outer shell and the inner shell is configured as a heating chamber through which a coolant for cooling a power source mounted on a vehicle flows, and an inner shell is provided. A pressurized chamber in which a medium that changes gas-liquid is sealed, an oil chamber compressed by the vapor pressure of the medium in the pressurized chamber is provided, and a hydraulic pressure is generated by compression of the oil chamber. A hydraulic power source device, wherein a bottom upper plate is provided at the bottom of the pressurization chamber with a gap between the bottom wall of the inner shell, and a gap between the bottom upper plate and the peripheral wall of the inner shell is formed around the bottom upper plate. It is characterized by securing.

[0005] The liquid-phase refrigerant accumulates at the bottom of the pressurized chamber, and in this state, the heat transfer portion contributing to the heating and vaporization of the refrigerant is limited to the bottom wall of the inner shell and the vicinity thereof. From the gap between the bottom plate and the bottom wall of the inner shell, the refrigerant droplets are scattered upward through the gap around the bottom plate with the boiling of the refrigerant. Is distributed. Therefore, not only the bottom wall of the inner shell but also the bottom upper plate and the peripheral wall serve as heat transfer portions that contribute to the heating and vaporization of the refrigerant, and the refrigerant is efficiently heated and vaporized by increasing the heat transfer area. It is advantageous to provide a plurality of ridges extending in the vertical direction on the inner surface of the peripheral wall of the inner shell at intervals in the circumferential direction, since the heat transfer area is further increased.

Incidentally, it is conceivable to connect an upwardly extending cylinder to the inner shell and form an oil chamber in the cylinder separated from the pressurizing chamber by a piston inserted therein, but this increases the size of the apparatus. . In contrast,
If the bellows which can expand and contract vertically is stored in the inner shell, and the bellows constitutes an oil chamber, the size of the apparatus can be reduced. However, if a bellows is used, the evacuation passage opening to the pressurized chamber is blocked by the expansion of the bellows at the time of evacuation prior to charging the refrigerant into the pressurized chamber, and the pressurized chamber cannot be sufficiently evacuated. . In this case, if the bottom upper plate is provided as in the present invention, further downward expansion of the bellows is restricted by the contact of the bellows with the bottom top plate. Therefore, if a vacuum passage communicating with the gap between the bottom plate and the bottom wall of the inner shell is provided, the pressure chamber can be sufficiently evacuated without being disturbed by the bellows.
Further, if the ridges are provided on the inner surface of the inner wall of the inner shell as described above, even if the bellows comes into contact with the inner wall of the inner shell due to the radial expansion of the bellows, gaps are formed on both sides of the ridge. Therefore, poor evacuation due to partial blockage of the pressurizing chamber can be prevented.

[0007]

FIG. 1 shows a hydraulic power source device according to the present invention. The device includes an outer shell 1 and an inner shell 2 which are elongated in a vertical direction. A space between the outer shell 1 and the inner shell 2 is formed in the heating chamber 3, and a power source mounted on the vehicle, for example, a coolant such as water or oil for cooling a motor in an engine or an electric vehicle (hereinafter, cooling water). To the heating chamber 3 at the lower end of the inflow port 3a.
To the outflow port 3b at the upper end.

The inside of the inner shell 2 is constituted by a pressurizing chamber 4 in which a medium having a low boiling point, such as ammonia or chlorofluorocarbon (for example, fluorocarbon 134A), is sealed. In addition, inner shell 2
Has a bellows 5 made of rubber at its upper end
It is housed in a state of being fitted to a piping plug 6 inserted in the upper wall portion. The inside of the bellows 5 is constituted by an oil chamber 7 connected to a hydraulic actuator mounted on the vehicle, for example, a hydraulic cylinder (not shown) for adjusting the vehicle height, and is heated and vaporized by the heat of the cooling water flowing through the heating chamber 3. The oil chamber 7 is compressed by the vapor pressure of the medium in the pressurizing chamber 4 to generate hydraulic pressure.

The outer shell 1 is made of resin to enhance heat insulation in order to suppress heat radiation to the outside, and the inner shell 2 is made of a metal having good heat conductivity, for example, aluminum. Here, if the inner shell 2 is made thick to secure the strength as a pressure vessel, the heat mass becomes large, and it takes time from the start of the flow of the cooling water to the rise of the hydraulic pressure, and the heat-pressure conversion becomes difficult. Responsiveness deteriorates. Therefore, in the present embodiment, as shown in FIG.
A corrugated fin member 8 is provided in contact with the outer shell 1 and the inner shell 2, and the internal pressure of the pressurizing chamber 4 is reduced by the inner shell 2.
Not only that, it can be received by the outer shell 1 via the fin member 8. According to this, the strength as a pressure vessel can be secured without making the inner shell 2 as thick as the left side, and the heat mass can be reduced to improve the responsiveness of heat-pressure conversion.

Further, by providing the fin members 8, the heat transfer area increases, and the efficiency of heat transfer from the cooling water to the inner shell 2 improves. Further, in the present embodiment, the fin member 8
As shown in FIG. 3, a plurality of window holes 8a are formed by partially cutting and raising the cooling water, and cooling water flowing through a passage portion 3a defined by the outer shell 1 and the fin member 8 is supplied to the inner shell 2 as shown in FIG.
And the fin member 8 can be introduced into the passage portion 3b defined by the fin member 8 through these window holes 8a.
Direct heat exchange between the cooling water and the inner shell 2 is promoted, and the heat transfer efficiency is further improved.

A bottom plate 9 is provided at the bottom of the pressurizing chamber 4 with a gap between itself and the bottom wall 2 a of the inner shell 2. The outer diameter of the upper bottom plate 9 is slightly smaller than the inner diameter of the inner shell 2, and a gap between the outer wall 2 b of the inner shell 2 is secured around the bottom upper plate 9. The bottom upper plate 9 is seated on the bottom wall 2a of the inner shell 2 at recesses 9a formed at a plurality of locations in the circumferential direction, and is connected at the center to the upper end of a plug 10 inserted into the bottom wall 2a.

The plug 10 has a passage 10a formed therein. After the pressurizing chamber 4 is evacuated through the passage 10a, a medium is injected into the pressurizing chamber 4, and finally, the passage 10a is connected to the blind plug 10b.
Then, the medium is sealed in the pressure chamber 4. Passage 10a
It communicates with the central opening 9b of the bottom upper plate 9 and the plug 1
The inner shell 2 communicates with the gap between the bottom upper plate 9 and the bottom wall 2a of the inner shell 2 through a horizontal hole 10c formed at zero. Thus,
Even if the bellows 5 expands downward during evacuation and the opening 9b is closed, the inside of the pressurizing chamber 4 is formed through the gap between the bottom top plate 9 and the bottom wall 2a and the gap around the bottom top plate 9. Since the suction force acts on the pressure chamber 4, the pressure chamber 4 can be sufficiently evacuated without being disturbed by the bellows 5.

On the inner surface of the peripheral wall 2b of the inner shell 2, a plurality of ridges 11 extending in the vertical direction are provided at intervals in the circumferential direction. In the present embodiment, the ridge 11 is formed of a wire, but the ridge 11 may be formed integrally with the peripheral wall 2b. When the bellows 5 expands in the radial direction during the evacuation of the pressurizing chamber 4 and comes into contact with the inner surface of the peripheral wall 2b over the entire circumference, no more suction force acts on the upper portion of the contact portion. Is provided, a gap is formed on both sides of the ridge 11, so that a suction force acts on the upper part of the contact portion of the bellows 5 through this gap, and thus the pressure chamber 4 can be evacuated reliably. . The lower end of the ridge 11 is inserted into a gap between the upper bottom plate 9 and the peripheral wall 2b of the inner shell 2.

When cooling water flows through the heating chamber 3, the liquid phase medium stored at the bottom of the pressurizing chamber 4 is heated and vaporized by heat from the cooling water. At this time, the bottom upper plate 9 and the bottom wall 2a of the inner shell 2
With the boiling of the medium, the liquid droplets of the medium are scattered upward through the space around the bottom upper plate 9 from the gap between the liquid and the medium in the liquid phase. Therefore, not only the bottom wall of the inner shell 2 but also the bottom upper plate 9 and the peripheral wall 2b become heat transfer portions that contribute to the heating and vaporization of the liquid phase medium, and the fin member 8 and the ridge 1
1, the liquid phase medium is efficiently heated and vaporized, and the responsiveness of the heat-pressure conversion is improved as much as possible.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of an example of the apparatus of the present invention.

FIG. 2 is an enlarged sectional plan view taken along the line II-II of FIG.

FIG. 3 is a sectional view taken along line III-III of FIG. 2;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Outer shell 2 Inner shell 2a Bottom wall 2b Peripheral wall 3 Heating chamber 4 Pressurizing chamber 5 Bellows 7 Oil chamber 9 Bottom plate 10a Vacuum passage 11 Protrusion

Claims (3)

[Claims] 1. A heating chamber comprising a vertically extending outer shell and an inner shell, wherein a space between the outer shell and the inner shell is formed as a heating chamber through which a cooling medium for cooling a power source mounted on a vehicle flows. A vehicle in which a pressurized chamber in which a medium that changes gas and liquid is sealed is provided, and an oil chamber that is compressed by the vapor pressure of the medium in the pressurized chamber is provided, and a hydraulic pressure is generated by compressing the oil chamber. A hydraulic pressure source device, wherein a bottom upper plate is provided at the bottom of the pressurizing chamber with a gap between the bottom wall of the inner shell, and a gap between the bottom upper plate and the peripheral wall of the inner shell. A hydraulic power source device for a vehicle, characterized by: 2. The hydraulic power source device for a vehicle according to claim 1, wherein a plurality of ridges extending in a vertical direction are provided at intervals in a circumferential direction on an inner surface of a peripheral wall of the inner shell. 3. An inner shell for accommodating a bellows constituting an oil chamber, and further comprising a vacuum passage communicating with a gap between the bottom upper plate and the bottom wall of the inner shell. 3. The vehicle hydraulic power source device according to claim 1.