JPS62265482A - Internal gear pump or motor - Google Patents

Abstract

PURPOSE:To decrease the number of machining processes, by a method wherein a sash fastener engaging part and a bearing part are mounted to a side sealing member being slidable over the inner periphery of a gear case, and a sash fastener and a support shaft are supported to the side sealing member so that they are slidable in the direction of an axis. CONSTITUTION:A side sealing member 13, making contact with both sides of each of gears 6 and 7 is engaged with the inner periphery of a gear case 2 so that it is slidable in the direction of an axis. Both end parts of a sash fastener 8 are slidably engaged with an engaging part 16 of the side sealing member 13, and a support shaft 18 is supported by means of a bearing part 17. This constitution facilitates improvement of size precision of a micro-gap formed between the addendum of each of the gears 6 and 7 and the sash fastener 8, and prevents increase of the number of machining processes.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Fields] The present invention is widely used in various fields using hydraulic mechanisms in 1.
``This concerns internal tooth 1 (referred to as Pump 1 'RS).

[Prior art J This kind of internal tooth-1 (as a pump, t-shaped l!i
Itj case and this k Rotation 1-1 on the inner circumference of the east case
This inner tooth is fitted with the inner tooth. I Il
Inner J, +- to J, outer ganga-F, and a crescent that delineates the space formed between these two southeast areas into the Ichikawa area and the low-pressure area, and Menki Ryo - attached to the east side. There is a known device which is equipped with a side seal member having a side seal member. and,
This one has a front cover and a rear cover attached to the openings at both ends of the southeast case. It consists of a double force bar with a 5-piece bearing section.
It is designed to support the supporting shaft.

By the way, in order to improve the NM effect of such an internal gear pump, it is necessary to reduce both the so-called top leakage and side leakage.
By increasing the precision of the dimensions of each part, +ii. 1
The gap 10 between the tip of the tip of the tooth and the crescent is made small to reduce tooth tip leakage, and the side seal member is made of a pressure balance type that allows free movement in the axial direction. Side leakage is suppressed by attaching the member to the south side surface in an appropriate manner using the elastic force of rubber or the like. However, when a pressure-balance type side seal member is adopted for an internal gear pump, the relationship between the crescent that seals the tooth tip and the side seal member (
If the setting of the R-law relationship is inappropriate, the movement of the side seal member will be restricted by the crescent, making it impossible to sufficiently suppress side leakage. Therefore, there was a problem that design and manufacturing were difficult.

Therefore, 1 the present inventor provided a retaining part consisting of four parts or a through hole in the side seal member, and provided an inner part in which the end of the crescent was slidably and removably fitted in the axial direction. Developed a contact gear pump.

However, if it is like this, can the problem of the movement of the movable side seal member being restricted by the crescent be easily solved? Although it is possible to solve the problem quickly and reliably, with this width, the problem arises that it becomes difficult to manage leakage from the 1 meter tip. That is, such JIyi
In the adult one, external tooth i! ! The weight is k Ilj case is too much
The crescent is supported by the covered cover, and the crescent is k! l<It will be supported by the side sole member housed in the case. Therefore, if you try to keep the gap between the tip of the southeast tooth of No. 161 and the crescent of No. 1ii within 47+, which is within the strict tolerance/r-law range, all of the Shiki Shuitun case, front cover, rear cover, and side seal members will be It is necessary to process with extremely high precision, and the problem arises that it takes time and time to manufacture.

[Problems to be solved by the invention E] The present invention solves the problem of inscribed -! ((In order to effectively suppress both the problems that the pump has, namely tooth tip leakage and side leakage, it is necessary to improve the opening machining accuracy of many Jllllll, respectively. The purpose of this project is to definitely solve problem 2, which is that the number of products must be large.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides an internal gear pump having the basic configuration as described above, in which the side seal member is attached to the inner periphery of the gear case. a crescent holding part in which the end of the crescent engages with the side seal member; and a bearing part in which the support shaft of the external gear fits. The crescent and the external gear are both supported by the side seal member in a sliding manner in the axial direction.

(Function) With this configuration, since the side seal member is provided with a sliding opening in the axial direction, a pressure balance system can be adopted for the side seal member. The side seal member is provided with a retaining portion, and the retaining portion supports the end of the crescent while sliding in the axial direction.The existence of the crescent prevents the side seal member from moving in the axial direction. 1v1 is not limited to; Since this is supported by this side seal member, the dimensional accuracy of this side seal member and the locking part between this side seal member and the gear case must be strictly controlled. It is +'+l function to precisely define the relative positions of the outer Shang'er car, the crescent and the inner 1!fl&1 city.

[Example] Below 1. (Explanation 1!1 of one embodiment of the invention based on one part of the drawing)
do.

FIG. 1 is a sectional view of an internal gear pump 1 according to the present invention. This internal t@11L pump l includes a casing 5 having a front cover 3 attached to one end opening of a cylindrical gear case 2 and a rear cover 4 attached to the other end opening. 7 this cage/ri 5 k 11
A ring-shaped internal gear 6 is rotatably fitted on the inner periphery of the case 2, and an external gear 6 is fitted on the inner periphery of the case 2.
The i-wheel 7 is internally engaged.

As shown in FIG. 2, the crescent-shaped space formed between these two gears 6 and 7 is divided into a high pressure region 11 and a low pressure region 12 by a crescent 8, and the two gears 6 and 7 are Side seal members 13 are attached to both sides, respectively.

The side seal member 13 is a disc-shaped member having a certain thickness, and is fitted into the inner circumference of the vehicle case 2 in an axial direction. A rotation-preventing key 14 is attached to the outer periphery of this side seal member 13, and the key 14 is inserted into a key groove 15 aligned with the axis provided on the inner periphery of the vehicle 2. In addition, in the portion of each side seal member 13 corresponding to the crescent 8, there is a concave engagement having an opening shape corresponding to the cross-sectional shape of the crescent 8. portions 16 are respectively formed,
Both ends of the resent 8, which are wider than both widths of the wheel 6.7, are fitted into the engaging portions 16 of the side seal members 13 so as to be able to slide in the axial direction. Furthermore, bearing portions 17 are formed at eccentric positions of each of these side seal members 13, and these bearing portions 17 support the support shaft 18 of the outer f&+lk middle -7.

The bearing portion 17 has a Vt through hole formed in the side seal member 13.
This bearing part 17 allows the support shaft 18 to rotate freely in the direction of the 1L axis.1. I'm starting to get it. The tip of the support shaft 18 penetrates the front cover 3 and extends to the outside, and a sealing material 19 is provided at the rt communication portion thereof.

The side seal member 13 also includes a high pressure side RFI hole 21 communicating with the high pressure region 11, as shown in the third IA.
A low-pressure side through-hole 22 passing IJi into the low-pressure region 12 is bored and recessed, and an annular groove surrounding the through-holes 21 and 22 is formed on the end face of each side seal member 13 on the east side opposite to the teeth. 23.24 is set. And the annular groove 2
3.24 is a pressure balance river gasket 25.26 made of elastic material such as rubber! By connecting the gaskets 25 and 26 to the corresponding front cover 3 and rear cover 4, the high-pressure side pressure pocket 2 is
7 and a low pressure side pressure pocket 28. That is, this thing has the high pressure region 11 and the low pressure region 1.
2, the side seal member 13 is pushed outward by the pressure of the hydraulic fluid.

The force of pressing the side seal member 13 inward due to the pressure of the hydraulic fluid introduced into both pressure pockets 27.
The side sealing member 13 is brought into contact with the side surface of the wheel 6.7 by the force of 5. The one-box rear cover 4 is connected to the high pressure area 11 through the C1 through hole 21! Discharge boat 29 and city record L? i! to the low pressure region 12 through the through hole 22. If the structure is such that a suction port 30 is provided for passing through the outside (!! That is, when the spindle 18 is rotationally driven to rotate the outward southeast 7 and the internal gear 6 that meshes with it in the direction of the arrow X, the suction boat 29 introduces water into the low pressure region 12 The hydraulic fluid is trapped between the outer grooves 11L7 and inner 1!!17411j6 and guided to the positive region 11, and is discharged from this high pressure region 11 to the outside of the casing 5 through the discharge port 28. be done.

And among these, for JatM tun pump l, ff1tlj
The side seal member 13 is slidably mounted on the case 2 in the axial direction, and the engaging portion 1 is attached to the side seal member 13.
6:9: That engagement? Since a part of the crescent 8 is slid in the axial direction on lAl6, the movement of the side seal member 13 in the axial direction is not restricted by the presence of the crescent 8. By making the side seal member 13 a pressure-balanced type as described above, side leakage can be effectively prevented.
-Can be done.

Moreover, the side seal member 13 is fitted to the inner periphery of the Ik IIj case 2 by 1 m1, and the bearing portion 17 is also fitted to the side surface knoll member 13. Since both the crescent 8 described in 1iii and the support shaft 18 of the southeast external tooth 7 are supported by this side seal member 13, this side seal cloth material 13, this side seal member 13, and the southeast case 2 As long as the dimensional accuracy of the mating part of the LF! Car 7. It is essential to accurately define the relative positions of the crescent 8 and the internal gear 6. Therefore, it becomes easy to increase the dimensional accuracy of the minute gap formed between the tip of each float 6.7 and the crescent 8,
It is possible to easily and effectively improve the labor rate without causing an increase in processing costs.

Furthermore, when the bearing portion 17 is provided on the side seal member 13, the support shaft 18 of the southeast external tooth 7 can be supported near the load point. Therefore, the deflection of the support shaft 18 can be eliminated, and from this point of view, it is possible to qualitatively improve the accuracy of the small gap between the tip of each southeast 6.7 and the crescent 8. Become.

Furthermore, if the side seal member 13 is also used as a bearing, the side seal member 13 can be used without increasing the size of the casing 5.
3 can be made thicker, and there is also an effect that +-i+ It: can be easily formed.

In the embodiment described above, the key is used to prevent the side sole member from rotating relative to the 9II east case. If the axis of the member is eccentric, there is no risk that the side seal member will rotate unrestricted, so the key is not necessarily a ghostly thing. of? By tying it in place, it is possible to prevent unnecessary moments from acting on the support shafts of both types of external teeth, so it is important to ensure a more stable rotation of the side seal member.

Further, in the above embodiment, the explanation was given only for use as a pump, but the same applies when used as a motor.

Effect 1 of 1 shot 1 many 1 Since the present invention has the following configuration, it is possible to effectively suppress both tooth tip leakage and side leakage without causing difficulties in adding 1-]-. Therefore, it is possible to provide an excellent internal pump or motor that can easily and effectively increase volumetric efficiency.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention; FIG. 1 is a sectional view of the skin, and FIG. 2 is a sectional view taken along the line ■-■ in FIG. FIG. 3 is a cross-sectional view taken along the line ■-m in FIG. 1. No. 1φ・Inscribed southeast pump 2・IIL case 6・Inner Shangtun 7・Raiken outside IMk11t 8--Spring crescent 13ψ・・Side seal member 16・Engaging part 17・・Bearing part

Claims (1)

[Claims] A cylindrical gear case, an internal gear rotatably fitted to the inner periphery of the gear case, an external gear internally meshed with the internal gear, and a space formed between these gears. In the internal gear pump or motor, the internal gear pump or motor includes a crescent that divides the air into a high-pressure region and a low-pressure region, and a side seal member attached to the side surfaces of both gears, the side seal member being attached to the inside of the gear case. A crescent engaging portion that is slidably fitted around the periphery in the axial direction and that the end of the crescent engages with the side seal member, and a bearing portion that engages the support shaft of the external gear. An internal gear pump or motor, characterized in that the crescent and the support shaft are both supported by a side seal member thereof so as to be slidable in an axial direction.