JPH0544467A - Water pump for engine - Google Patents

Abstract

PURPOSE:To utilize turning torque of an engine while improving capacity for circulating cooling water in case of necessity. CONSTITUTION:A water pump for an engine comprises a first gear 10 provided on a driving shaft 11 driven in rotation by an engine, a second gear 20 connected to a impeller 2 for circulating cooling water, a third gear 30 which is rotated epicyclically between both gears 10, 20 while engaging with them, and a hydraulic motor 4 for rotating the third gear 30. Rotational speed increased in addition to rotational speed of the first gear 10 rotated by the engine, is transferred to the second gear 20 by rotating epicyclically the third gear 30 by means of the hydraulic motor 4, and it is thus possible to improve capacity for circulating cooling water of the impeller 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water pump for circulating cooling water between an engine and a radiator in an automobile or the like, and more particularly to a water pump capable of improving its pumping capacity as required.

[0002]

2. Description of the Related Art As shown in FIGS. 11 and 12, in an automobile, for example, cooling water for cooling an engine 92 is circulated between the engine 92 and a radiator 93. This circulation is performed by the water pump 91. Further, the water pump 91 is rotationally driven by interposing a belt 922 between a pulley 910 provided on a drive shaft 911 thereof and an output shaft pulley 92 of the engine 92.

Further, the water pump 91 is shown in FIG.
As shown in FIG. 7, an impeller 912 for circulating the cooling water arranged in the housing 916 and the drive shaft 91 connected to the impeller 912.
It consists of 1. The impeller 912 is arranged in the pump case 917 between the suction port 913 and the discharge port 914. Incidentally, reference numeral 918 in the figure is a bearing. Further, reference numeral 915 in FIG. 11 denotes a cooling water circulation pipe, and 94 denotes a bypass. By the way, the conventional water pump 91 for circulating the engine cooling water is
2 rotations of the pulley 920, the belt 922 and the pulley 91.
Since it is transmitted via 0, the circulation capacity of the cooling water is determined by the engine speed. Therefore, it is impossible even if there is a case where it is desired to improve the circulation ability of the cooling water, such as during the summer or when traveling uphill. Therefore, in order to arbitrarily control the circulation ability of the cooling water (flow rate control), a system has been proposed in which a water pump is driven by hydraulic pressure (Japanese Patent Laid-Open No. 63-117118).

[0004]

However, since the hydraulic rotation system disclosed in the above publication directly rotates the impeller of the water pump by the hydraulic motor, the hydraulic pump of the former type uses the rotational force of the engine. In contrast, separate drive power is always required. for that reason,
The power source to be mounted on the vehicle will increase. In view of the above conventional problems, the present invention is to provide a water pump for an engine that utilizes the rotational force of the engine and can improve the circulation ability of the cooling water when necessary.

[0005]

According to the present invention, there is provided a first gear provided on a drive shaft rotatably driven by an engine, an impeller for circulating cooling water between the engine and a radiator, and the impeller connected to the impeller. An engine water comprising a second gear, a third gear that meshes with the first gear and the second gear and planet-rotates between them, and a hydraulic motor that rotates the third gear. On the pump.

What is most noticeable in the present invention is that the drive shaft, which is rotationally driven by the engine, is provided with a first gear,
The second gear is connected to the circulation impeller, and the first gear and the second gear are connected.
The third gear, which is planet-rotated by a hydraulic motor, is interposed between the gear and the gear. Then, the impeller is normally rotated by the rotational force of the engine, and when a circulation capacity higher than the circulation capacity based on the rotation of the engine is required, the third gear is planetarily rotated by the hydraulic motor to further increase the rotation speed of the impeller. It is configured to let.

The third gear meshes with both the first gear and the second gear, and is arranged so as to rotate between the two planets (see FIGS. 1, 3 and 9). Further, the hydraulic motor is rotated by pressurized oil sent from a hydraulic pump provided separately. The rotation of the hydraulic motor, that is, the rotation of the third gear is controlled by controlling the flow rate of the pressurized oil. Also,
The water pump of the present invention is one in which a gear group constituted by the first to third gears and a hydraulic motor for rotating the third gear are built in the housing together with the impeller (integrated in the housing ( See FIGS. 1, 7, 8, and 9). Further, in the present invention, in addition to these, a hydraulic pump for driving the hydraulic motor may be integrally formed in the housing (see FIG. 10).

[0008]

[Operation and effect] In the water pump of the present invention,
It has a first gear provided on the drive shaft, a second gear connected to the impeller, and a third gear meshed with the first gear and rotated by a planetary gear by a hydraulic motor. Further, the drive shaft is rotationally driven by the engine. The hydraulic motor is not normally rotated. Therefore, the third gear remains meshed and fixed between the first gear and the second gear. Also,
The drive shaft rotates due to the rotational force of the engine. Therefore, the first gear provided on the drive shaft rotates. Then, the rotational force is transmitted to the second gear via the fixed third gear. Therefore, the second gear rotates coaxially with the first gear, rotates the impeller connected to the second gear, and circulates the cooling water.

On the other hand, when the cooling water circulation capacity is insufficient due to only the rotational force of the engine, the hydraulic motor is operated to rotate the third gear as a planet. Therefore, the planetary rotation speed of the third gear is further added to the second gear in addition to the rotation speed based on the first gear. Therefore, the second
The number of rotations of the gear increases, and the cooling water circulation capacity of the impeller improves. Therefore, it is possible to make up for the lack of circulation ability. The replenishment amount of the circulation capacity is controlled by controlling the rotational speed of the hydraulic motor, controlling the flow rate of pressurized oil that rotates the hydraulic motor, and the like. Therefore, replenishment control of circulation capacity is easy.

Further, the water pump of the present invention is compact because the impeller, the first to third gears and the hydraulic motor are integrally formed in the housing. Therefore, according to the present invention, it is possible to provide a water pump for an engine that utilizes the rotational force of the engine and can improve the circulation ability of the cooling water when necessary.

[0011]

【Example】

Example 1 An engine water pump according to an example of the present invention will be described with reference to FIGS. As shown in FIGS. 1 to 4 and 7, the water pump 1 of the present example has an engine 9
2, a drive shaft 11 driven to rotate, a first gear 10 provided on the drive shaft 11, an engine 92, and a radiator 93.
And an impeller 2 for circulating cooling water, and a second gear 20 connected to the impeller 2. Further, two third gears 30 are interposed between the first gear 10 and the second gear 20 and mesh with each other and rotate between them both as a planet.
And a hydraulic motor 4 for rotating the third gear 30. And these are integrally built in the housing 5.

The drive shaft 11 has a pulley 12, and the pulley 12 is connected to a pulley (not shown, see FIG. 11) provided on the output shaft of the engine 92 via a belt. Further, the drive shaft 11 has a first gear 10 that meshes with the third gear 30. Further, the impeller 2 is arranged between the suction port 913 and the discharge port 914 of the cooling water as in the conventional case, and the output shaft 21 of the second gear 20 is connected to the impeller 2 ( (Fig. 1). The second gear 20 has a U-shaped cross section, and has teeth inside which mesh with the third gear 30.

Next, the above-mentioned two third gears 30 are
As shown in FIGS. 5 and 6, with respect to the rotary plate 32,
A shaft 33 is rotatably attached to the shaft. Further, in the rotary plate 32, a hydraulic rotary blade 31 arranged in the hydraulic motor is fixed to the surface opposite to the surface on which the third gear 30 is arranged. In addition, the rotating plate 32
Has a shaft hole 310 into which the drive shaft 1 is freely rotatably inserted (FIGS. 1 and 5). In addition, the hydraulic motor 4
Is provided between the housing 5 and the motor housing 51, as shown in FIGS. Then, in the motor chamber inside thereof, the motor blades 41 are arranged on the outer peripheral side,
The hydraulic rotary vane 31 meshing with the motor vane 41 is arranged inside thereof, and a hydraulic chamber 40 is formed between them. Further, an introduction pipe 45 for introducing pressurized oil and a discharge pipe 46 for discharging pressurized oil are connected to the hydraulic chamber 40.

The introduction pipe 45 and the discharge pipe 46 are
As shown in FIG. 7, it is connected to a hydraulic pump 47. Further, a bypass valve 451 is provided between both pipes. The hydraulic pump 47 is connected to the pulley of the engine 92 via a pulley 470 and a belt (not shown). Reference numeral 48 in the figure is an oil tank. Others are the same as the conventional example (FIG. 11).

Next, the function and effect will be described. First, when the cooling water circulation capacity is normally satisfied by the rotation of the engine, such as when the cooling water temperature is low, as shown in FIG.
The bypass valve 451 is opened. Therefore, since pressurized oil does not flow into the hydraulic motor 4, the hydraulic motor 4 does not operate. Therefore, the hydraulic rotary vane 31 and the rotary plate 32 do not rotate, and the two third gears 30 remain stationary between the first gear 10 and the second gear 20.

Therefore, the first gear 10 and the second gear 20
Is integrally rotated via the stationary third gear 30, and the impeller 2 is rotated by the rotational force of the engine. That is, in the normal time, the impeller 2 is operated by the rotation of the engine. On the other hand, when the cooling water circulation capacity is insufficient due to only the rotational force of the engine, the third gear 30 is planet-rotated by the hydraulic motor 4 to improve the circulation capacity.

That is, in this case, the bypass valve 451 shown in FIG. 7 is closed. As a result, the pressurized oil discharged from the hydraulic pump 47 enters the hydraulic chamber 40 of the hydraulic motor 4 through the introduction pipe 45. Therefore, as shown in Figure 2,
The motor blade 41 rotates in the direction of the arrow (to the left) by the pressure of the pressurized oil. Then, the hydraulic rotary blade 31 that meshes with the motor blade 41 in a concentric manner is rotated in the same direction. As shown in the figure, since the drive shaft 1 is loosely fitted in the shaft hole 310 of the hydraulic rotary vane 31, it rotates independently of the rotation of the hydraulic rotary vane 31.

Next, by rotating the hydraulic rotary vanes 31, as shown in FIGS. 3, 5 and 6, the rotary plate 32 is rotated.
Rotate together. Therefore, as shown in FIGS. 3 and 4, the two third gears 30 pivotally attached to the rotary plate 32 are
It moves while rotating around the first gear 10. That is, the planet rotates. Therefore, the rotation speed obtained by adding the rotation speed of the first gear 10 to the planet rotation speed of the third gear 30 is given to the second gear 20.

As a result, the rotation of the impeller 2 connected to the second gear 20 is accelerated, and the cooling water circulation capacity is increased. Therefore, it is possible to replenish the lack of circulation ability. The replenishment amount of the circulation capacity can be controlled by controlling the rotational speed of the hydraulic motor 4, controlling the flow rate of the amount of pressurized oil introduced into the hydraulic motor 4, and the like. Further, in the present example, the first gear 10 of the drive shaft 11 is arranged around the shaft and the second gear 20 is arranged on the outer peripheral side. However, conversely, the first gear 10 is arranged on the outer peripheral side and the second gear 20 is arranged. It is also possible to adopt a configuration in which is arranged at the center of the axis.

Embodiment 2 In this embodiment, a hydraulic pump 472 for a cooling fan, as shown in FIG. 8, is used as a hydraulic pump for introducing pressurized oil into the hydraulic motor 4. The hydraulic pump 47
Reference numeral 2 is conventionally used for feeding pressurized oil to a fan hydraulic motor 951 for driving the cooling fan 95. In this example, the hydraulic motor 4 for the water pump is arranged in parallel in the middle of the hydraulic circuit. A valve 452 for rotation control is also provided on the introduction pipe 45 of the hydraulic motor 4. Others are the same as in the first embodiment. According to this example, the hydraulic pump 472 for the conventional cooling fan can be used. Further, the same effect as that of the first embodiment can be obtained.
Further, instead of the hydraulic pump 472, a hydraulic pump for power steering can be used.

Embodiment 3 In this embodiment, as shown in FIG. 9, bevel gears are used for the first gear 100, the second gear 200, and the third gears 300, 300. The third gear 300 includes the first gear 100 and the second gear.
It is meshed with the gear 200 so as to be able to rotate as a planet. The third gear 300 is rotatably supported by a rotary plate 320 having a U-shaped cross section by a shaft pin 330. The rotary plate 320 is connected to the hydraulic rotary blade 31 of the hydraulic motor 4 as in the first embodiment. Second
The gear 200 is coaxial with the output shaft 21. Others are the same as in the first embodiment. Also in this example, the same effect as that of the first embodiment can be obtained.

Fourth Embodiment In this embodiment, as shown in FIG. 10, a water pump 1 having the impeller 2, the hydraulic motor 4, and the first to third gears shown in the first embodiment is further integrated with a hydraulic pump 473. It is built into a single unit. That is, Example 1
The water pump 1 and the hydraulic pump 473 described above are incorporated in one housing.

The pressurized oil from the hydraulic pump 473 is also used for the hydraulic motor 4 for the water pump and the hydraulic motor 951 for the cooling fan. Further, the hydraulic pump 473 is rotated by the engine via the pulley 12. Others are the same as in the first embodiment. Also in this example, the same effect as that of the first embodiment can be obtained. Further, the water pump 1 and the hydraulic pump 473 are configured as one unit, so that the unit is compact.

[Brief description of drawings]

FIG. 1 is a sectional view of a water pump according to a first embodiment.

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

3 is a sectional view taken along the line BB of FIG.

FIG. 4 is a first gear, a second gear, and a third gear in the first embodiment.
Explanatory diagram of the arrangement of gears.

FIG. 5 is a right side perspective view of the rotating plate according to the first embodiment.

FIG. 6 is a left side perspective view of the rotating plate according to the first embodiment.

FIG. 7 is an explanatory diagram of a hydraulic circuit and a cooling water circuit according to the first embodiment.

FIG. 8 is an explanatory diagram of a hydraulic circuit and a cooling water circuit according to the second embodiment.

FIG. 9 is a sectional view of a water pump according to a third embodiment.

FIG. 10 is an explanatory diagram of a hydraulic circuit according to a fourth embodiment.

FIG. 11 is an explanatory diagram of a cooling water circuit in a conventional example.

FIG. 12 is a sectional view of a water pump in a conventional example.

[Explanation of symbols]

 1. ． ． Water pump, 10,100. ． ． 1st gear, 11. ． ． Drive shaft, 2. ． ． Impeller, 20,200. ． ． 2nd gear, 30,300. ． ． 3rd gear, 32. ． ． Rotating plate, 4. ． ． Hydraulic motor,

Claims (1)

[Claims] 1. A first gear provided on a drive shaft rotatably driven by an engine, an impeller for circulating cooling water between the engine and a radiator, and a second gear connected to the impeller. An engine water pump comprising: a third gear that meshes with the first gear and the second gear to make a planetary rotation between them; and a hydraulic motor that rotates the third gear.