JPH03290077A - Oil pump device - Google Patents

Abstract

PURPOSE:To improve the lubrication effect of a fitting part between a fitting groove and a thrust suppressing plate by allowing the thrust suppressing plate engagement stage part side of an oil seal hole having the larger diameter than that of a bearing hole which is formed on a pump case to communicate to a groove corresponding to a suction passage through the second oil passage having a control jet interposed. CONSTITUTION:As for an oil pump device which is prepared by arranging an inner rotor 4 and an outer rotor 5 in a rotor accommodation chamber C has an oil seal accommodation hole 1E which is divided into an oil seal accommodation hole 1F on a bearing hole side and an oil seal accommodation hole 1G on a thrust suppressing plate engagement stage part side by an oil seal S on a pump case 1, and the accommodation hole 1F communicates to a groove 7A corresponding to a suction passage and the first oil passage 9. In this case, a second oil passage 20 is provided whose one edge is opened to the groove 7A corresponding to the suction passage and whose other edge is opened to the oil accommodation hole 1G on the plate engagement stage part 1B side. In the second oil passage 20, a control jet 21 is arranged, and the leak of the pressure from the oil seal accommodation hole 1G in the nearly atmospheric pressure state is suppressed.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention includes an inner rotor that rotates integrally with a drive shaft and has external teeth, and an inner rotor that is eccentric around the inner rotor and inscribed in the external teeth of the inner rotor. An outer rotor with internal teeth is arranged in a rotor storage chamber formed in the pump case, and a suction space and a discharge space formed by the external teeth of the inner rotor and the internal teeth of the outer rotor are provided with a pump cover. This invention relates to an oil pump device connected to a suction passage and a discharge passage respectively.

[Conventional technology]

A conventional oil pump device will be explained with reference to FIG.

1 has a connecting flat surface 1A on the left side in FIG. 1 and a thrust locking step IB on the right side, and a rotor storage chamber IC having a circular cross section opens in the connecting flat surface LA. This is a pump case in which a bearing hole ID is bored in the bottom of the rotor storage chamber IC so as to be connected to the thrust stop locking step IB.

Further, an oil seal housing hole IE having a diameter larger than the diameter of the bearing hole ID is bored from the thrust stop locking step portion IB of the pump case 1, and the oil seal housing hole IE is connected to the bearing hole ID.

2 has a connecting flat surface 2A corresponding to the connecting flat surface lA of the pump case 1, and a bearing hole l of the pump case l.
This pump cover has a bearing hole 2B drilled concentrically with the axis of D, and an oil seal storage hole 2C having a larger diameter than the bearing hole 2B is drilled in connection with the bearing hole 2B.

Then, the bearing hole ID of pump case 1 and pump cover 2
A drive shaft 3 is rotatably inserted into the bearing hole 2B, and a rotational force is applied to one end of the rotary shaft 3 from a drive source (not shown).

On the other hand, the drive shaft 3 that passes through the rotor storage chamber tC has
The inner rotor 4 is fitted into the drive shaft 3 so as to rotate together with the drive shaft 3.

Specifically, this is achieved by fitting a knock pin 5 protruding from the drive shaft 3 into a coupling groove 4A provided at the center of the inner rotor 4.

On the outer periphery of the inner rotor 4, an annular outer tooth 4B is formed concentrically with the longitudinal axis of the drive shaft 3. The outer rotor 5 has an annular inner tooth 5A, which is arranged eccentrically around the inner rotor 4, and the outer teeth 4B of the inner rotor 4 and the inner teeth 5Al# of the outer rotor 5 mesh with each other and are transferred. Inner rotor 4. The outer rotor 5 is arranged within the rotor storage chamber IC.

And if the internal teeth 5A and external teeth 4B are trochoidal curves,
The internal teeth 5A and the external teeth 4B are joined at their peaks and valleys in some parts, and their peaks are joined in other parts. Further, an arc-shaped suction passage 6A and a discharge passage 6B are opened in the connecting flat surface 2A of the pump cover 2, and by joining the pump cover 2 and the pump case l, the suction passage 6A and the discharge passage 6B are opened. opens into the rotor storage chamber IC of the pump case L, and further opens into the suction passage 6.
A is connected to an oil inlet (not shown), and the discharge passage 6B is connected to an oil outlet (not shown).

When the inner rotor 4 rotates, the gap between the outer teeth 4B of the inner rotor 4 and the inner teeth 5A of the outer rotor 5 expands to form a suction space that sucks oil, and this suction space is used as a suction space. On the other hand, a discharge space for discharging oil is formed at a portion where the gap between the outer teeth 4B of the inner rotor 4 and the inner teeth 5A of the outer rotor 5 is reduced.
This discharge space opens into the discharge passage 6B. In addition, S is the oil seal storage hole 1E of the pump case l and the pump force/<
-2 is an oil seal placed in the oil seal storage hole 2C.

Furthermore, a suction passage corresponding #I7A and a discharge passage corresponding groove 7B having shapes corresponding to the suction passage 6A and the discharge passage 6B are bored at the bottom of the rotor storage chamber IC. Furthermore, a ring-shaped fitting 113A is bored perpendicular to the longitudinal axis direction XX of the drive shaft 3,
A flat thrust stop plate 8 having a thickness slightly thinner than the groove width of the fitting groove 3A is rotatably fitted into this fitting @3A, and the outer periphery of the thrust stop plate 8 is the outer circumference of the pump case l. It is fixedly arranged on the thrust stop locking step IB.

In this conventional example, the thrust stopper plate 8 is fixed with screws, but other parts for attaching the oil pump device (for example, the transmission case of the engine) can be used to fix the thrust stopper plate 8.
may be fixed.

Therefore, the oil seal housing hole 1E of the pump case 1 is divided by the oil seal S into an oil seal housing hole IF on the bearing hole side and an oil seal housing hole IG on the thrust stop plate locking step side. The oil seal storage hole IF on the bearing side is connected to the suction passage corresponding groove 7A through the first oil passage 9.

In this oil pump device, when the drive shaft 3 rotates, the rotation of the drive shaft 3 is transmitted to the inner rotor 4 via the knock pin 5, and this rotation is transmitted from the outer teeth 4B of the inner rotor 4 to the inner teeth 5A of the outer rotor 5. The signals are transmitted to rotate the outer rotor 5 synchronously and synchronously.

According to this, oil is sucked from the suction passage 6A into the suction space where the gap between the internal teeth 5A of the outer rotor 5 and the external teeth 4B of the inner rotor 4 is enlarged, and the oil is sucked into the internal 5A of the outer rotor 5.
Oil is discharged through the discharge passage 6B from the discharge space in which the gap between the outer teeth 4B of the inner rotor 4 and the outer teeth 4B of the inner rotor 4 is reduced, thereby achieving a pumping action.

On the other hand, the rotation of the drive shaft 3 is such that a rotational force is applied from another drive source through a rotation transmission member such as a gear, and the drive shaft 3 is rotated in the longitudinal axis direction x-x of the drive shaft 3. receives thrust force. This thrust force is generated by the thrust stop plate 8 being rotatably fitted into the fitting groove 3A of the drive shaft 3, and its outer periphery being fixed on the thrust stop locking step IB of the pump case l. Thrust direction of shaft 3 (
Movement of the drive shaft 3 in the longitudinal axis direction XX) is suppressed.

[Problem to be solved by the invention]

In such a conventional oil pump device, the thrust stop plate 8 and the fitting groove 3A of the drive shaft 3 are not lubricated.

This is because the oil seal housing hole IE is liquid-tightly divided by the oil seal S, and the supply of oil to the oil seal housing hole IG on the thrust stop locking step side is particularly cut off. If the fitting portion between the thrust stopper plate 8 and the fitting groove 3A is not lubricated as described above, there is a risk that the fitting portion will wear out, and as a solution to this problem, periodically apply lubricant. Or, it was necessary to specially select the material of the thrust stop plate. According to the former, maintenance is troublesome or there is a risk of forgetting it, and according to the latter, a lot of time is spent on material selection, which reduces development efficiency and sometimes requires the use of expensive materials. There is,
It was less economical.

[Means for Solving the Problems] [Operation] The oil pump device of the present invention is intended to solve the above-mentioned problems. The purpose of this device is to provide a pump device, and in order to achieve the above purpose, the pump device is fitted into a drive shaft rotatably supported by a pump case and a pump cover covering the pump case, and rotates integrally with the drive shaft. An inner rotor with external teeth; an outer rotor with internal teeth that are eccentric around the inner rotor and mesh with the external teeth of the inner rotor: the inner rotor and the outer rotor are placed in a rotor storage chamber formed in the pump case. a suction space and a discharge space formed by the outer teeth of the inner rotor and the inner teeth of the outer rotor; a pump cover having a suction passage connected to the suction space and a discharge passage connected to the discharge space; In an oil pump device consisting of: a pump case having a suction passage corresponding groove drilled in the bottom of the rotor storage chamber and corresponding to the suction passage formed in the pump cover, the oil pump device is perpendicular to the longitudinal axis direction of the drive shaft. A ring-shaped fitting groove is bored, and a thrust stop plate is rotatably fitted into the fitting groove, and the outer periphery of the thrust stop plate is fixed on the thrust stop plate locking step of the pump case. On the other hand, from the end of the bearing hole of the pump case, an oil seal storage hole with a diameter larger than the hole diameter of the bearing hole is opened toward the locking step of the thrust stopper plate of the pump case, and inside the oil seal storage hole. The arranged oil seal divides the oil seal storage hole into an oil seal storage hole on the bearing hole side and an oil seal storage hole on the thrust stop plate locking step side, and the oil seal storage hole on the bearing hole side corresponds to the suction path. The grooves are connected by a first oil passage, and the oil seal storage hole on the side of the thrust stop plate locking step and the suction passage corresponding groove are connected by a second oil passage that has a control jet inside.

The amount of oil in the groove corresponding to the suction passage is regulated by the control jet, and the restricted oil is supplied to the oil seal storage hole on the side of the plate locking step, and this oil allows the fitting to be completed. The fitting portion between the groove and the thrust stop plate is lubricated with oil.

〔Example〕

Hereinafter, an embodiment of the oil pump device according to the present invention will be described with reference to FIG. (Incidentally, the same reference numerals are used for the same structure as in Fig. 1, and the explanation is omitted.) 20 has one end opening in the suction passage corresponding groove 7A, and the other end opening on the side of the plate locking step. The second oil passage opens into the storage hole IG, and in this embodiment, it is branched from the first oil passage 9 instead of opening directly into the suction passage corresponding groove 7A.

Further, a control jet 21 having a diameter smaller than that of the first oil passage 9 and the second oil passage 20 is arranged in the second oil passage 20 . When a rotational force is applied to the drive shaft 3 from a drive source outside the oil pump device, the drive shaft 3 rotates, and the outer teeth 4B of the inner rotor 4 and the inner teeth 5A of the outer rotor 5 rotate. When the gap expands to form a suction space, the pressure within this suction space decreases, and this pressure drop causes oil to be drawn into the suction space through the suction passage 6A, which opens corresponding to the suction space. When the gap between the outer teeth 4B of the inner rotor 4 and the inner teeth 5A of the outer rotor 5 is reduced to form a discharge space, the pressure in this discharge space increases, and the pressure in this discharge space increases. The oil stored in the discharge space due to the pressure increase is discharged to the discharge passage 6B which opens corresponding to the discharge space.

On the other hand, when the drive shaft 3 rotates, the drive shaft 3 receives a thrust force in the longitudinal axis direction x-x. 3A, the movement of the drive shaft 3 in the thrust direction is inhibited.

In the oil pump device of the present invention that performs such a pumping action, the fitting groove 3A between the thrust stop plate 8 and the drive shaft 3 is
Lubrication of the fitting part between the two parts is carried out as follows. That is, when the gap between the external teeth of the inner rotor 4 and the internal teeth 5A of the outer rotor 5 is expanded to form a suction space, the pressure in this suction space decreases (during the suction process of the pump). At this time, the suction space opens corresponding to the suction passage 6A and the suction passage corresponding groove 7A, and in the suction passage corresponding groove 7A, the first oil passage 9 is in the oil seal storage hole IF on the bearing side in a sealed state. On the other hand, a control jet 21 is disposed in the second oil passage 2o to prevent pressure from leaking from the oil seal storage hole IG on the thrust stop locking step side, which is at approximately atmospheric pressure.

It is not possible to prevent the pressure in the suction passage corresponding groove 7A from decreasing (there is no pressure increase toward the atmospheric pressure side). Therefore, the suction passage 6A is Oil is sucked into the suction space and the suction passage corresponding groove 7A through the suction passage.

A part of the oil sucked into the suction passage corresponding groove 7A flows from the first oil passage 9 into the oil seal storage hole IF on the bearing side and lubricates the bearing hole ID and the drive shaft 3. The amount of oil in the two oil passages 20 is restricted by a control jet 21, and the properly controlled oil flows into the oil storage hole IG on the side of the thrust stop locking step, and this oil prevents the drive shaft 3 from fitting. Oil lubrication is performed over the entire circumference of the fitting portion between the groove 3A and the thrust stopper plate 8.

〔Effect of the invention〕

According to the uninvented oil pump device as described above,
Since the oil seal housing hole on the thrust stop locking step side and the suction passage corresponding groove are connected through the second oil passage equipped with an internal control jet, the outer teeth of the inner rotor and the outer The pressure drop in the suction space formed by the internal teeth of the rotor, the suction passage, and the groove corresponding to the suction passage can be well maintained, and oil can be sucked into the suction space and the groove corresponding to the suction passage through the suction passage. On the other hand, the oil sucked into the eye entry groove is properly controlled by the control jet and supplied to the oil seal housing hole on the side of the thrust stop locking step, so there is little oil leakage from the pump case to the outside. The fitting portion between the fitting groove of the drive shaft and the thrust stop plate can be well lubricated with oil.

Therefore, regular maintenance for supplying lubricating oil is no longer necessary, and furthermore, the degree of freedom in selecting materials for the drive shaft and thrust stopper plate is greatly increased, which has great practical effects.

[Brief explanation of drawings]

Figure 1 is a vertical sectional view showing a conventional oil pump device, Figure 2 is a vertical sectional view showing a conventional oil pump device.
The figure is a longitudinal sectional view showing an embodiment of the oil pump device of the present invention. 1, Pump case 1B, Thrust stop locking step 1D...Bearing hole IE, Oil seal storage hole 1F, 6. Bearing side oil seal storage hole 1G...
Oil seal storage hole on the thrust stop locking step side

Claims (1)

[Claims] An inner rotor is fitted into a drive shaft that is rotatably supported by a pump case and a pump cover that covers the pump case, rotates together with the drive shaft, and has external teeth; An outer rotor with internal teeth that mesh with the external teeth; an inner rotor and an outer rotor are arranged in a rotor storage chamber formed in the pump case, and a suction space is formed by the external teeth of the inner rotor and the internal teeth of the outer rotor. , a discharge space; a pump cover having a suction passage connected to the suction space; and a discharge passage connected to the discharge space; and a pump cover that is bored at the bottom of the rotor storage chamber of the pump case and corresponds to the suction passage formed in the pump cover. In an oil pump device, a ring-shaped fitting groove is bored perpendicular to the longitudinal axis direction of the drive shaft, and a thrust groove is provided in the fitting groove. The stop plate is rotatably fitted and arranged, and the outer periphery of the thrust stop plate is fixedly placed on the thrust stop plate locking step of the pump case, while the end of the bearing hole of the pump case is inserted from the hole diameter of the bearing hole. A large-diameter oil seal storage hole is opened toward the thrust stop plate locking step of the pump case, and an oil seal placed inside the oil seal storage hole connects the oil seal storage hole to the oil seal storage hole on the bearing hole side. The oil seal housing hole on the bearing hole side and the suction passage corresponding groove are connected through the first oil passage, and the oil seal housing hole on the side of the thrust stop plate locking step is connected through the first oil passage. An oil pump device in which an oil seal housing hole and a suction passage corresponding groove are connected through a second oil passage having a control jet inside.