JPH0579463A - Inscribed fluid pressure device - Google Patents

Abstract

(57) [Abstract] [Purpose] Suppresses fluid or rotating shaft pulsation that occurs according to the number of teeth on the rotor, and performs stable operation as an oil pump or oil motor. According to a deviation of a predetermined angle set between the mutual position of the first inner rotor 7 and the first outer rotor 5 and the mutual position of the second inner rotor 8 and the second outer rotor 6, A phase difference is generated between the pulsation generated by the first two rotors 7 and 5 and the pulsation generated by the second both rotors 8 and 6, and the two pulsations are cancelled.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inscribed type fluid pressure device such as an inscribed type oil pump or an inscribed type oil motor having a trochoidal tooth shape.

[0002]

2. Description of the Related Art Generally, as an inscribed oil pump of this type, a ring-shaped outer rotor rotatably fitted in a casing and a rotary shaft inserted through the casing are mounted on the outer rotor. And an inner rotor rotatably disposed inside the outer rotor, a tooth surface having (N + 1) teeth is formed on the inner peripheral surface of the outer rotor, and N (however, on the outer peripheral surface of the inner rotor). N is 2 or more), and the plurality of spaces formed between the tooth surfaces of both rotors are formed by the outer rotor rotating as the inner rotor (rotating shaft) rotates. , Its volume is changed, so that the fluid is sucked into the space through the suction port formed in the casing facing the end faces of both rotors, and the discharge is also formed in the casing. Which is adapted to discharge the fluid has been known over preparative.

[0003]

However, in the above-mentioned conventional inscribed oil pump, the volume of the space formed between the tooth surfaces of both rotors increases or decreases, so that the fluid to be discharged will not be absorbed by the rotor. There is a problem that pulsation occurs according to the number of teeth. On the other hand, in the inscribed oil motor having the same structure as the inscribed oil pump, there is a problem that the rotation of the rotating shaft pulsates depending on the number of teeth of the rotor.

The present invention has been made in view of the above circumstances, and an object of the present invention is to suppress the fluid pulsation or the pulsation of the rotating shaft that occurs in accordance with the number of teeth of the rotor.
An object of the present invention is to provide an inscribed type fluid pressure device capable of performing stable operation as an oil pump or an oil motor.

[0005]

In order to achieve the above object, the present invention provides a ring-shaped outer rotor rotatably provided in a casing and having (N + 1) teeth, and an outer rotor of the outer rotor. It is rotatably installed inside,
And an inner rotor having N (where N is 2 or more) teeth, a suction port for supplying a fluid to a space formed between these rotors, and a discharge port for discharging the fluid in the space. In the inscribed type fluid pressure device, a plurality of inner rotors are mounted on one rotation shaft, and the mutual position of the first inner rotor and the first outer rotor arranged outside the first inner rotor, A deviation of a predetermined angle is set between the mutual position of the second inner rotor and the second outer rotor arranged outside the second inner rotor.

[0006]

In the inscribed fluid pressure device of the present invention, between the mutual position of the first inner rotor and the first outer rotor and the mutual position of the second inner rotor and the second outer rotor. By the deviation of the predetermined angle set to
By generating a phase difference between the pulsation generated by the first inner rotor and the first outer rotor and the pulsation generated by the second inner rotor and the second outer rotor,
By canceling out the pulsations from each other, the pulsation of the fluid or the rotating shaft generated depending on the number of teeth of the rotor is suppressed.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. Although the present embodiment describes an internal contact type oil pump (internal contact type gear pump) having a trochoidal tooth shape, the present invention is not limited to the structure of the internal contact type oil pump of this embodiment.

In these drawings, reference numeral 1 is a casing in which a casing body 2 and a cover 3 are fastened with bolts 4. Inside the casing body 2 of the casing 1, a pair of ring-shaped outer rotors 5, 6 are rotatably mounted. Further, inside the first and second outer rotors 5 and 6, there are mounted first and second inner rotors 7 and 8, respectively, and inner peripheral surfaces of these outer rotors 5 and 6 are mounted. In Figure 2
As shown in FIG. 4, a trochoidal tooth surface having seven teeth is formed, and a trochoidal tooth surface having six teeth is formed on the outer peripheral surfaces of both the inner rotors 7 and 8.

Inside the inner rotors 7 and 8,
Spline-shaped mounting holes are formed respectively, and the spline shaft portion of one rotating shaft 9 is mounted in these mounting holes. The rotating shaft 9 is rotatably supported by the casing 1 by a bearing 10 with one end of the rotating shaft 9 protruding from the inside of the casing 1. Also, FIG.
A reference numeral 11 is a seal member for liquid-sealing between the rotary shaft 9 and the cover 3.

The first and second inner rotors 7, 8
Is set so that the crests of the teeth of the first inner rotor 7 coincide with the troughs of the teeth of the second inner rotor 8 as shown in FIG. The peaks are set so as to coincide with the valleys of the teeth of the second outer rotor 6. And both rotors (5, 7), (6
Suction ports 12 and 13 and discharge ports 14 and 15 are formed in the casing 1 facing the end surface of 8), respectively, and both discharge ports 14 and 15 merge into a discharge passage in the casing 1. ing. The rotation axes of the rotors (5, 7) and (6, 8) are set eccentric by the distance a. Although not shown, supply passages for supplying fluid to the suction ports 12 and 13 are connected to the suction ports 12 and 13, respectively.

In the inscribed oil pump constructed as described above, when the rotary shaft 9 is rotated, the inner rotors 7, 8 are rotated, and accordingly, the outer rotors 5, 5 are rotated.
6 also rotates. As a result, both rotors (5, 7), (6,
8) By increasing or decreasing the volume of the space formed between them, the fluid is sucked from the suction ports 12 and 13, and the fluid is discharged from the discharge ports 14 and 15.

In this case, the fluid between the rotors 5 and 7 and the fluid between the rotors 6 and 8 have pulsations, respectively. As shown in FIG. 4, the first and second inner rotors 5 are , 6 are deviated from each other by a certain angle, and the teeth of the first and second outer rotors 7 and 8 are deviated from each other by a predetermined angle, the mutual positions of the rotors 5 and 7 are:
A deviation of a predetermined angle is set between the rotors 6 and 8 and the mutual positions of the rotors 6 and 8, so that the pulsation of the fluid generated by the rotors 5 and 7 and the pulsation of the fluid generated by the rotors 6 and 8 are set. Causes a phase difference, and both pulsations work so as to cancel each other out. As a result, it is possible to greatly suppress the pulsation of the fluid, which has conventionally occurred in the inscribed oil pump, depending on the number of teeth of the rotor.

Further, since the conventional product can be used as it is for the cover 3 of the casing 1, the manufacturing cost can be reduced.

In FIG. 1, intake ports 12 and 13 and discharge ports 14 and 15 are formed on the left and right end surfaces of the rotors 5 to 8, respectively, but each rotor 5 is illustrated. 8 to 8 may be formed only on one end surface (in this figure, only the ports 13 and 15 on the cover 3 side are used, and suction and discharge on the rotors 5 and 7 side are performed via the rotors 6 and 8). .. Further, although the internal type oil pump has been described in the present embodiment, in the same structure, if the working fluid is supplied from the suction port and the rotational output of the rotary shaft is taken out, the rotational pulsation is suppressed. It can be used as an inscribed type oil motor.

[0015]

As described above, according to the present invention, a ring-shaped outer rotor rotatably provided in a casing and having (N + 1) teeth, and rotatably provided inside the outer rotor. And N (where N is 2
(Above) an inner rotor having a number of teeth, an intake port for supplying fluid to a space formed between these rotors,
In an inscribed fluid pressure device having a discharge port for discharging fluid in the space, a plurality of inner rotors are attached to one rotation shaft, and a first inner rotor and an outer side of the first inner rotor are provided. A deviation of a predetermined angle is set between the mutual position of the arranged first outer rotor and the mutual position of the second inner rotor and the second outer rotor arranged outside the second inner rotor. Therefore, the mutual position of the first inner rotor and the first outer rotor, and the second inner rotor and the second inner rotor are
Of the pulsation caused by the first inner rotor and the first outer rotor and the pulsation caused by the second inner rotor and the second outer rotor due to the deviation of the predetermined angle from the mutual position of the outer rotor of By generating a phase difference between them and canceling out both pulsations, it is possible to suppress the pulsation of the fluid or rotating shaft that occurs according to the number of teeth of the rotor, and perform stable operation as an oil pump or oil motor. be able to.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a relationship between a first outer rotor and an inner rotor.

FIG. 3 is an explanatory diagram showing a relationship between a second outer rotor and an inner rotor.

FIG. 4 is an explanatory diagram showing a relationship between two sets of an outer rotor and an inner rotor.

[Explanation of symbols]

 1 Casing 5 First Outer Rotor 6 Second Outer Rotor 7 First Inner Rotor 8 Second Inner Rotor 9 Rotating Shaft 12 Suction Port 13 Suction Port 14 Discharge Port 15 Discharge Port

Claims (1)

[Claims] 1. A ring-shaped outer rotor rotatably provided in a casing and having (N + 1) teeth, and rotatably provided inside the outer rotor,
And an inner rotor having N (where N is 2 or more) teeth, a suction port for supplying a fluid to a space formed between these rotors, and a discharge port for discharging the fluid in the space. In the inscribed type fluid pressure device, a plurality of inner rotors are mounted on one rotation shaft, and the mutual position of the first inner rotor and the first outer rotor arranged outside the first inner rotor, An inscribed type fluid pressure device, wherein a deviation of a predetermined angle is set between a mutual position of the second inner rotor and a second outer rotor arranged outside the second inner rotor.