JPS59196985A - Oil pump - Google Patents

Abstract

PURPOSE:To prevent generation of abnormal sounds and promote and facilitate the manufacture of the oil pump by a method wherein the discharge-side opening of a side plate, capable of being worked by a press, is elongated to the opposite direction of the rotation of a gear so that the opening area thereof is decreased gradually toward the same direction. CONSTITUTION:An outer gear 7, an inner gear 6 and a crescent 8 are provided in a housing 2 and the discharge-side opening 11' of the side plate 9, connected to a side surface of the housing, is formed by elongating it into the opposite direction of the rotating direction of the gears 6, 7 so that the opening area is decreased gradually. The elongated part 11a' of the discharge-side opening 11' arrives at the jointing part of the crescent 8 and gears 6, 7, therefore, sudden change of hydraulic pressure may be mitigated by the effect of this communicating part and generation of abnormal sounds may be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to an oil pump O2 which is provided with a nagya and a crescent, and is formed by joining a side plate to one side thereof.

Figure 1 shows the oil pump section of an automatic transmission for automobiles.
In the cross-sectional views, Figure 2 shows only the oil pump components, Figure 43 is an exploded view of its main components, and Figure 4 shows the connections between the outer gear, inner gear, and crescent in the housing. It is a spacing explanatory diagram.

In the figure, 1 is the transmission case, 2 is the oil pump housing, 3 (see Figure 2) is the torque j '7 Harterkaher, the scratch is the oil pump drive shaft, 5 is the oil pump drive plate with 7N applied to this shaft 2, and 6 is the oil pump drive plate. The inner gear 7 connected to the plate 5 is connected to the housing 2 so as to mesh with the inner gear 6.
An outer gear is rotatably provided in the inner gear; 8 is a tower send formed integrally with the housing 2 so as to be interposed between the inner gear 6 and the outer gear 7; 9 is a side that is joined to the open end surface of the housing 2; In the plate, 10 is an opening on its suction side, and 11 is an opening on its discharge side. (See Figure 4) In Figure 4, inner gear 6 and outer gear 7
When rotates in the direction of arrow R, the space S that communicates with the suction side opening 10 shown in the chain diagram becomes the oil suction side, and the space D that communicates with the discharge side opening 1l shown in the chain diagram becomes the oil discharge side. Be on the side. Therefore, approximately the range θ1 from A to B
Since this is the inhalation process, the oil in this part contains an adult's
If is acting. Also, the range θ2 from approximately B to C
Since is the oil transfer stroke, unless there is oil leakage, no pressure will act on the oil in this area. T, that is, the oil pressure in this part is almost 0. Zarani, Habo C
The range θ8 from A to A is the force of the discharge stroke, and the oil in this part (here, the discharge pressure (positive l+:,) acts).

In other words, in this oil pump, tax aid line C method 1? The pressure of the oil in iJ is almost O, and when it crosses the channel C, the oil pressure suddenly becomes the discharge pressure.

Therefore, the oil pressure suddenly changes with the boundary line C as a turning point. If there is a place where the oil pressure changes during rotation of the oil pump, this is often the cause of 8A vinegar generation.

For this reason, methods as shown in FIGS. 5 and 6 have been conventionally implemented to prevent abnormal noises from oil pumps.

In other words, the method shown in FIG. 5 involves cutting the discharge side end 8a of the oil pump send 8 diagonally, and the method shown in FIG. The inclined groove 11 is connected to the end of the discharge side opening 11 of '.
It is formed by extending a.

By doing the above, in any case, the sudden change in the oil pressure is alleviated, and the effect of preventing foreign particles can be achieved. However, the above-mentioned conventional techniques require unnecessary equipment for performing inclined machining. It had the disadvantage of requiring G.

Do you understand the drawbacks of this invention? This type of oil pump was developed by extending the discharge side opening of the side plate, which can be pressed, in the direction opposite to the rotational direction of the gear so that the opening area gradually decreases. The purpose of this is to prevent the occurrence of abnormalities during production (2), and by using press processing to make manufacturing easier, faster, and easier, and to reduce costs.

The present invention will be explained in detail below with reference to FIGS. 7 and 8. In the figure, the same reference numerals as 01j indicate equivalent items.

The present invention provides an oil pump in which an outer gear 7, an inner gear 6, and a cressend 8 are provided in the Ujifugu 2, and a side plate 9 is joined to the negative side 1 m. As shown in FIG. 7, the opening area is extended in a direction opposite to the direction of rotation of the gear 6.7 so that the opening area gradually decreases. That is,
11a' is an extension of the opening 11'.

When Q is rubbed as described above, as shown in FIG. The above-mentioned hydraulic pressure change is slowed down by the action of the part. Therefore, according to the present invention, it is possible to prevent the occurrence of abnormalities in this type of oil pump, and by using press processing to process the discharge side opening, manufacturing can be made extremely quickly and easily.
Not only that, but the cost can also be reduced, which is an excellent effect.

[Brief explanation of drawings]

Figure 1 shows the oil pump section of an automatic transmission for automobiles.
2 is a sectional view showing only the components of the oil pump, FIG. 8 is an exploded perspective view of the main components, and FIG. 4 is an explanation showing the assembled state of each component in the housing. Figure 51fl(a) is an oil pump for explaining the conventional technology...
Diagonal view of the housing: side view, Figure 6 (b) is a partial detail view, Figure 6 (a) is a perspective view of the oil pump cover, Figure (1)) is a partial detail view, Figure 7 is a detailed view of the oil pump cover. A perspective view showing the side plate of the invention oil pump, and FIG. 8 is an explanatory view of its operation. Shaft 5...Oil pump drive plate 6...Inner gear
7...Outer gear 8...Tales send 9.
・・Side plate lO・Nukuri Soura mouth 11・・
・Discharge side port] l' ・Discharge side port 1 according to the present invention 1] a'...Temporary placement part. Patent applicant: Nissan Motor Co., Ltd. Figure 2 Figure 3 Figure 4 Figure 5

Claims (1)

[Claims] 1. In an oil pump in which an outer gear, an inner gear, and a crescent are provided in a how/jig, and a side plate is joined to the -' opening surface of the oil pump, the discharge side opening of the side plate is oriented in the opposite direction to the rotational direction of the gear. An oil pump characterized by being extended so that its opening area gradually decreases.