JPH0625581U - Oil pump - Google Patents

Abstract

(57) [Summary] [Purpose] A plurality of oil supply passages 24A having a large difference in flow path resistance,
Even when oil is supplied to 24B at the same time, the oil pressure and the amount of oil in the respective oil supply passages 14A and 24B can be set to stable and desired values without increasing the width (height) of the pump rotors 15 and 16 or the number of pump rotors. maintain. [Composition] A partition 23 is provided on the discharge side port 21 to divide it into a plurality of port portions 21A and 21B.
Connect A and 21B to the respective oil supply destinations, and use only a single rotor unit 15 and 16 for each port portion 21.
Oil is pressure-fed from A and 21B to the respective supply destinations.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an oil pump suitable for supplying lubricating oil in an engine or the like.

[0002]

[Prior art]

 An oil pump is generally used as a lubricating oil supply means for engines and the like, and oil (lubricating oil) is pressure-fed to each part including a main bearing of an engine and a transmission gear. Since this oil pump is generally installed inside an engine or the like, it is required that the structure be simple and have excellent durability, and that the amount of oil supplied should always be uniform. As the oil pump, for example, a trochoid pump, a gear pump (gear pump), a plunger pump, a vane pump (blade pump) or the like is used. In this type of oil pump, one pump rotor is provided with one suction port and multiple discharge ports. Documents showing the configuration of such a conventional oil pump include, for example, Japanese Utility Model Laid-Open No. 62-130188.

[0003]

[Problems to be solved by the device]

 In the conventional oil pump, the suction port and the discharge port both have a fixed shape, and when oil is pumped to multiple (for example, two) oil supply passages at the same time, passage holes are provided at multiple locations on the discharge side port. Has been adopted. However, in such a conventional configuration, when the difference in flow passage resistance between the oil supply passages is large, a large amount of oil flows toward the oil supply passage having the small flow passage resistance, and the oil pressure in the oil supply passage having the large flow passage resistance is increased. And it is difficult to secure the amount of oil.

Therefore, it is conceivable to increase the width (height) of the pump rotor in order to secure the oil pressure and the oil amount of each oil supply passage. However, in such a method, an oil supply passage having a small flow passage resistance is provided. Since a large amount of oil flows, a large space is required, and there is a problem that mechanical loss increases. As another method to secure the oil pressure and the amount of oil in each oil supply passage, it is possible to increase the number of pump rotors (rotor units), but such a method requires a large space. In addition, there is a problem that the structure becomes complicated and the cost is significantly increased.

The present invention has been made in view of such a technical problem, and an object of the present invention is to provide a pumper of a pumper even when oil is simultaneously supplied to a plurality of oil supply passages having a large difference in flow path resistance. An object of the present invention is to provide an oil pump that can secure the hydraulic pressure and the amount of oil in each oil supply passage at desired values without increasing the width (height) or the number of pump rotors.

[0006]

[Means for solving the problem]

 The present invention is an oil pump that supplies oil from a discharge side port to multiple systems.By providing a partition on the discharge side port and dividing the discharge side port for each supply destination, it is possible to use only a single rotor unit. The above object is achieved by adopting a configuration in which a predetermined oil pressure and oil amount are supplied to each supply destination.

[0007]

【Example】

 Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 is an axial longitudinal sectional view showing an embodiment of an oil pump to which the present invention is applied. 2 is a cross-sectional view taken along line 2-2 in FIG. 1, and FIG. 3 is a cross-sectional view showing a state when the pump rotor is further rotated along line 2-2 in FIG. 1 from FIG. It is a figure. FIG. 4 is a cross-sectional view showing a state in which the pump rotor is removed along the line 2-2 in FIG. 1 to 4 show the case where a trochoid pump is used as the oil pump.

In FIG. 1, the pump case 10 is configured by a case portion 10A and a case portion 10B that are abutted and fitted in a sealed state, and the drive shaft 11 penetrates through the center portion of the pump case 10. It is rotatably supported. A sprocket 13 for receiving a pump driving force transmitted from a crankshaft (not shown) of the engine or the like via a chain 12 is fixed to a protruding end portion of the drive shaft 11 on the right side in the drawing. 1 to 4, a cylindrical rotor chamber 14 is formed inside the pump case 10 (between the case portions 10A and 10B), and inside the rotor chamber 14, the outer rotor 15 and the inner rotor 15 are formed. 16 are stored.

The drive shaft 11 is pivotally supported at an eccentric position of the rotor chamber 14. A concentric star-shaped hollow portion 17 is formed at the center of the outer rotor 15, and the outer rotor 15 is rotatably housed in the rotor chamber 14. On the other hand, the inner rotor 16 is directly connected (fixed) to the drive shaft 11. A star-shaped outer peripheral portion 18 concentric with the drive shaft 11 is formed around the inner rotor 16 and the star-shaped outer peripheral portion 18 is located inside the star-shaped hollow portion 17 of the outer rotor 15. The number of protrusions of the star-shaped hollow portion 17 (5 places) is set to be larger than the number of protrusions of the star-shaped outer peripheral portion 18 (4 places). It is formed so that it can rub along the inner surface. Further, both side surfaces of each rotor 15, 16 are assembled so as to rub against both side surfaces of the rotor chamber 14. As described above, the pump chambers (plurality) 19 are formed between the rotors 15 and 16 and change in volume in one rotation cycle according to the rotation of the inner rotor 16.

1 to 4, the pump case 10 is provided with a suction side port 20 and a discharge side port 21 which are opened on the side surface of the rotor chamber 14. The suction side port 20 and the discharge side port 21 are formed so as to be able to communicate with the pump chamber 19 between the rotors 15 and 16. The suction port 20 is connected to an oil reservoir (not shown) such as an oil pan via a suction passage 22.

As shown in FIGS. 2 to 4, the discharge side port 21 is divided into a plurality (two in the illustrated example) by a partition 23, and each of the divided port portions 21 A and 21 B is respectively divided. It is connected to the corresponding supplier. In the illustrated example, for example, one port portion 21A is connected to an oil cooler (oil cooler) through a supply passage 24A, and the other port portion 21B is connected through a supply passage 24B to a crankshaft bearing portion or a transmission (transmission gear). Machine) is connected to guide the oil.

The inner rotor 16 and the outer rotor 15 are rotationally driven in a direction indicated by an arrow A in FIGS. 2 to 4. The rotation speed thereof is, for example, about 4000 to 6000 rpm when supplying lubricating oil for an automobile engine, and it is driven at a considerably high speed. Therefore, the partition 23 provided on the discharge side port 21 is rotated as shown in FIG. 4 in order to easily and smoothly discharge the oil from the port portions 21A and 21B even under such high speed rotation. It is preferably formed by inclining inward. Also, the opening area of the plurality (two) of the port portions 21A, 21B is determined by the flow path resistance of each oil supply destination connected to them, the required hydraulic pressure and oil amount, the temperature of the supply destination (oil temperature), etc. In consideration of the above, selection is made so as to be balanced with each other.

According to the embodiment described above, a partition 23 is provided on the discharge side port 21 of an oil pump such as a trochoid pump, and the port 21 is divided into a plurality of port portions 21A and 21B for each supply destination. Since the single rotor unit 15, 16 is configured to supply the predetermined hydraulic pressure and oil amount to each supply destination, one pump can supply the appropriate hydraulic pressure and oil amount to a plurality of supply destinations. It is possible to obtain an oil pump that can constantly supply the oil of.

Further, according to the above-described embodiment, by providing the partition 23, the period in which the pump rotors 15 and 16 pump the oil only to the supply passage 24B on the rear side in the rotational direction (the gap B in FIG. 3 is formed). Since it is possible to accurately regulate the amount of oil supplied to the supply passage 24A on the front side in the rotational direction, it is possible to sufficiently secure the hydraulic pressure of the supply passage 24B on the rear side.

FIG. 5 is a graph showing the test results of the rotational speed characteristics of the hydraulic pressure of the supply passage 24B in the above-described embodiment and the hydraulic pressure of the supply passage 24B in the conventional example (the configuration without the partition 23). The chain line in FIG. 5 shows the characteristic of the above-mentioned embodiment, and the solid line shows the characteristic of the conventional example. In addition, in the test sample of this test, the structure and dimensions of the oil pump were the same in the above-described example and the conventional example except for the presence or absence of the partition 23. Further, in both the above-described embodiment and the conventional example, the supply passage 24A was connected to the same oil cooler, and the supply passage 24B was connected to the gear portion of the same transmission for the test. As is clear from the test results of FIG. 5, according to the above-described embodiment in which the partition 23 is provided, it is possible to reliably increase the hydraulic pressure of the supply passage 24B on the rear side in the rotation direction and to perform stable oil supply. Become.

In the test of FIG. 5, it was noted whether or not the oil pressure in the supply passage 24B on the rear side in the rotation direction can be sufficiently secured to prevent the oil temperature from rising. From the test results, according to the above-mentioned embodiment, It was found that the oil could be cooled to the same extent as when it was circulated to the oil cooler with a single oil pump. Further, in the conventional example, excess oil is supplied to the oil cooler, so that the oil is wasted. However, according to the above-described embodiment, this wasted oil can be sent to the supply passage 24B. It was also made possible that it was possible to eliminate the waste of oil that was generated in the conventional example. In the above-mentioned embodiment, the case where the discharge side port 21 is divided into two by the partition 23 has been exemplified, but this can be achieved by increasing the number of partitions so that three or more supply destinations are connected to each other. It may be divided into one or more port parts.

[0017]

[Effect of device]

 As is clear from the above description, according to the present invention, in an oil pump that supplies oil to a plurality of systems from a discharge side port, a partition is provided at the discharge side port and the discharge side port is divided for each supply destination. As a result, a single rotor unit is used to supply a predetermined oil pressure and oil amount to each destination, so even if oil is simultaneously supplied to multiple oil supply passages that have large differences in flow path resistance, the pump rotor There is provided an oil pump that can secure the hydraulic pressure and the oil amount of each oil supply passage at desired values without increasing the width (height) of the pump and the number of pump rotors.

[Brief description of drawings]

FIG. 1 is a central longitudinal cross-sectional view showing the configuration of an embodiment of an oil pump to which the present invention is applied.

2 is a cross-sectional view showing a state of the pump rotor at a certain rotational position along a line 2-2 in FIG.

3 is a cross-sectional view showing a state in which the pump rotor is rotated by a predetermined angle from the position of FIG. 2 along a line 2-2 in FIG.

4 is a cross-sectional view showing the interior of the rotor chamber with the pump rotor removed along the line 2-2 in FIG.

5 is a graph showing a rotational speed characteristic of a hydraulic pressure of a supply passage communicating with a port portion on the rear side in the rotational direction of a discharge side port in FIG. 2 in comparison with a conventional example.

[Explanation of symbols]

 10 Pump Case 11 Drive Shaft 13 Sprocket for Driving Force Transmission 14 Rotor Chamber 15 Outer Rotor 16 Inner Rotor 19 Pump Chamber 20 Suction Side Port 21 Discharge Side Port 21A Port Part 21B Port Part 22 Suction Side Passage 23 Partition 24A Supply Passage 24B Supply Passage A rotor rotation direction

Claims (1)

[Scope of utility model registration request] 1. An oil pump for supplying oil from a discharge side port to a plurality of systems, wherein a partition is provided at the discharge side port and the discharge side port is divided for each supply destination, so that only a single rotor unit can be provided. An oil pump which supplies a predetermined hydraulic pressure and a predetermined amount of oil to each supply destination.