JPS6114489A - Gear pump or motor - Google Patents

Abstract

PURPOSE:To reduce the internal leak of a gear pump in low-speed revolution by allowing one among the pressure passages which communicate to an intermediate-pressure area formed onto the back-part of the side plate of the gear pump to communicate to a high-pressure side and allowing the other to communicate to the low-pressure side in the process where the tooth-groove pressure varies from low-pressure to high-pressure. CONSTITUTION:Each bush 30, 31 of a gear pump has the surface (a) on the equal level to the side surface of a body 11 and the surface (b) in the sunked state for the side surface of the body 11, and a sealing member 32 is arranged at the boundary. The low-pressure area L on the left side of the sealing member communicates to the an inport 35 side, and the other high-pressure area H communicates to an outport 36 side. The part in the tooth groove where the pressure varies according to the number of revolution of the gear forms an intermediate- pressure area M having a free piece 33, and into said intermediate-pressure area, each pressure of the outport and the tooth groove at the part on the low pressure-side of the intermediate pressure area is introduced through pressure transmitting passages 37 and 38.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a gear pump or motor that balances the loading force of a bush or side plate relative to a gear.

(Prior Art) Conventionally known gear pumps for JΦ are shown in FIGS. 3 to 5, or the gear pump 1 is described in Japanese Patent Application Laid-Open No. 52-48804.

The pore 12 of this body 11 has a gear I3.
Bushes 19 to 22 that hold the gear shafts 15 to 18 on both sides of the gear 13.14.
and cover the outside of these bushes 19 to 22 with 2
3 and a mounting flange 24.

4.5.1 Futoshi 1 No. 19 and 2'1.20 and 22
Each of them forms a river, and the 4M formations of the name aspect are fruitfully the same, so below I will explain the Bush 20 and 22 sides.

The high-pressure area T (and the low-pressure area L) are partitioned by materials 25 and 26. An intermediate pressure area M is formed within the low pressure area L at an area corresponding to the rotational position of the gear, where the pressure in the 1Φ■ groove changes in accordance with the rotational speed of the gear.

The intermediate pressure area M as described in item 1 has a bushing 20.
The pressure inside the tooth tel- is applied via a pressure transmission path 29 penetrating through the 22, or the opening end of this pressure transmission path 29 on the gear side corresponds to the rotational speed of the gear as described above. When the pressure inside the tooth groove changes drastically, the position of
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In this conventional gear pump, when the tooth groove corresponding to the gear side groove 1-1 of the pressure transmission path 29 becomes high pressure, the pressure in the tooth groove 1'1 is transmitted to the intermediate pressure area M. Due to some time roughness, 1 to 1 above! +
When the internal pressure of l'i reached -A, the pressure in this intermediate J1-area M did not immediately change to IJ/.゛In this way, the pressure in the intermediate pressure area M may go up a little, but at that moment, the loading force is insufficient, so a force from the side of the gear acts in the direction of do.

At this time, if the rotation speed of the gear pump is low by 1/l, 711'+
As a result, the pressure in the intermediate pressure area M cannot be maintained.

(Problems to be Solved by the Present Invention) As described in the following, when the pump rotates at low speed, the pressure in the intermediate pressure area M cannot be maintained at the corresponding tooth space pressure. This caused problems such as internal leakage during low-speed rotation, which significantly worsened the performance.

Therefore, an object of the present invention is to provide a gear pump or motor that can maintain an optimum pressure in the intermediate pressure area from 1 to 10 hours and reduce leakage even during low speed rotation.

(Means for Solving the Problems) In order to achieve the above object, the second invention provides a bushing or a side plate on the side surface of the gear, and the bushing or side plate on the side opposite to the gear. A high-pressure area and a low-pressure area are defined on the outside of the lr, and an intermediate pressure area is added to the part corresponding to the rotational position where j1° force in the tooth space changes drastically depending on the rotational speed of the gear. Partition...
On the other hand, -1 in a gear pump or motor in which the high pressure area is communicated with the out port side and the intermediate pressure area is communicated with a j;

The intermediate area and the tooth groove side of the gear are communicated through two pressure transmission paths, and one pressure transmission path is connected to the gear side [
1 * 11, ; is communicated with the low pressure side in the process where the tooth groove pressure changes from low pressure to high pressure, and one end of the gear side of the other pressure flow path is communicated with the high pressure side.

(Operation of the present invention) In the present invention, by rotating the gear, high pressure on the discharge side acts on the high pressure area marked J, and low pressure on the suction side acts on the low pressure area. Further, the intermediate pressure area 1 is discharged to an intermediate pressure between high pressure and low pressure in the process of changing the tooth groove from low pressure to high pressure. Therefore, the time delay in pressure transmission is substantially eliminated, so that it is not necessary to transmit pressure as in the prior art.

Since the delay is eliminated, there will be no shortage of loading force.

(Embodiment of the present invention) Since only the four parts of the tree are shown in Figures 1 and 2 of the drawings, the following will be explained below. - Explanation will be made using the same number on the right as in Fig. 5.

Therefore, the bushes 30 and 31 in this embodiment are
When assembled, it has a surface a that is on the same level as the side surface of the body 11, and a surface that is recessed against the side surface of the body 11, and both surfaces a. A sealing member 32 is placed along the boundary of b. In FIG. 1, the left side of the L member 32 is the low pressure area, and the right side is the high pressure area T (closed).

Furthermore, 1↓'+ jl? according to the number of times of Lya. The pressure within +f, +L <The free piece 33 is located at the part l that is centered on the rotating gear position 1bz-. And the outer circumference of this free piece, 'J3, is
Make a wound on the circumference of the pore 12 and contact the circumference +ni of the pore 12.
, the outer part, 1. Marking rule 1″ A 6 material 32 (〕t1
The low-pressure area L, which is located at the lower part of the free piece 33 as the intermediate-pressure area M, is connected to the import side 35, and is connected to the import side 1.1-1. Elijah H is A width) on the port 36 side,! l! As a musician, Elijah M.
P.

・、・Pair of pressure transmission paths 3 formed in 31
7.38・〒j-で、I! -11+lW Ga and G b (!+II is passed through f.

The pressure transmission path 37 on the side of the claw + and 31 is connected to the canine γ hole 37.
a and the orifice 37b are connected in series, and the large diameter hole 37
A is opened to the intermediate pressure area M side, and the orifice 37b is opened to
It is opened on the low pressure side of I''.

In addition, the pressure transmission path 38 of the bunsch 30, 31
Gates i+M 38a and Orinois 38b are formed in the middle row of the police officer.
A hole is formed in conjunction with the hole 1, and one end of the hole is connected to the intermediate pressure area M. Furthermore, an orifice 38b is formed with a minus sign so as to be connected to this hole, and each refit 38b is connected to the high pressure side of the groove in the process of changing from low pressure to high pressure. Open to [-1
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1. When the gear is rotated, the high pressure on the discharge side or
", 'J acts on the rear H, and the low pressure on the 1 pumping side acts on the low w, y-rear L.

Kirani, 1. The force of the part opposite to the intermediate pressure area M is as shown in the second floor,
``'I +! Pig teeth)? Outside cb to G, 11koo)' In the process of moving, it changes from LF to +jJ71 J'l-.In other words, G b a) low J' in the 7th position. j, E P
b, and the pressure is lowered to 797i Pa at the Ga position.

One pressure transmission path 37 ft: , which leads to the intermediate pressure area M at L7, communicates with the cb position indicated by -l-,
A pressure transmission path 38 for external force communicates with the Ga position.

Therefore, 7 where the pressure of the intermediate pressure area M is Pc,
l) t+ ,”,,・pc,; 41゛ri with P′lI at 11th street, 1 mountain iJi Kaino, j road 37.3
;3's lf:L:l□ILi II', only 1 no□"j
Shikere 1, this intermediate J1 Elijah M's monthly power Pc1i, P
cm(1/2)Pa=2Pb, which is exactly both fj+'
hV+ device Ga, Gbo7) Medium +++++ J',!
=, t 6゜, -like) し-中 i11:l/l工!
, ) -1-M 11 force is expressed as 1 + q rotation of Ki 1 (this I
=; Pressure is transmitted to the intermediate pressure area/M. Even if leakage occurs, there will be no shortage of low power.

In addition, as mentioned in 1, is the round pressure time 3'? , 38,
+ 1) The reason why fiss 37b and 38b were formed was to prevent the birth of Elopa Yon. In other words, if there are no 4-refrigerators 37b and 38b, 1-1 Ga (H'
Teeth 11η and G b in position i (mountain 7 seedlings in position Q, jlζ)
hF+, so when above that (11 connected 119), Pb=
Pa, and erosion is occurring around the tooth groove Gb.

However, if you form the orifice as above,
1↓(11■ The sudden pressure at the moment cb opens in the passage 37 [-1] can be summed up by -1, y1 -(), so the occurrence of i8 eros □so can be prevented and +l- can be achieved.

(Effects of the present invention) Since this invention is configured as shown in 5L, the intermediate t
S; Technique j) Y is connected to the intermediate pressure between the 4゛1''?, 1□ pressure and the low pressure where the tooth groove changes from low/+ to high.

Therefore, the time delay in pressure transmission is substantially eliminated, so that the time delay in pressure transmission is reduced by 1! If the I5 delay is not resolved, the loading capacity may be insufficient.

Furthermore, if a throttle is provided in the pressure transmission path, the occurrence of erosion can be reduced by 1!71I1. z and durability direction 1-
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Figure 4 f) (1 middle theory 1gj Figures 1 and 2 are gear pumps of this invention (・)
Fig. 1 is a side view with the mounting flange removed, Fig. 2 is an enlarged cross-sectional view of the main part, and Figs. h'53 to 5V show conventional gear pumps. So, Figure 3 is a cross-sectional view of the whole, Figure 4 is a side view with the mountain ink flange removed, and Figure h'55 is >j i'j
It is a sectional view of R.

13.14... Gear, 30.31... Bush, I
]...High pressure area, ■,...Low pressure area, M...
Intermediate pressure area, 37.38...pressure transmission path, Ga, G
b...Tooth space at a position where the tooth space hsuJ changes drastically depending on the rotational speed of the gear.

Claims (2)

[Claims] (1) A bush or side plate is provided on the side of the gear, and a high pressure area and a low pressure area are defined on the outside of the bush or side plate, which is the opposite side of the gear, and further, depending on the rotation speed of the gear, An intermediate pressure area is defined in a portion corresponding to a rotational position where the pressure in the tooth groove changes drastically, while the high pressure area is communicated with the outport side,
In a gear pump or motor in which a low pressure area is communicated with the import side and the intermediate pressure area is communicated with a tooth groove of a portion corresponding to the rotational position, the intermediate pressure area and the tooth groove side of the gear are connected to each other. At the same time, the opening end on the gear side of one pressure transmission path is connected to the low pressure side where the tooth space pressure changes from low pressure to high pressure, and the opening end on the gear side of the other pressure transmission path is connected. A gear pump or motor whose end is connected to the high pressure side. (2) The gear pump or motor according to claim 1, wherein a throttle is formed in each of the two pressure transmission paths that communicate the intermediate pressure area and the tooth groove of the gear.