Oil pump roter

An oil pump and rotor technology, applied in the field of oil pump rotor components, can solve the problems of increased pulsating suction and discharge rates, reduced pump efficiency, reduced pump efficiency, etc., and achieves reduced changes in suction and discharge rates and reduced volume changes , the effect of the maximum reduction

Inactive Publication Date: 2004-04-07
DIAMET CORP
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AI Technical Summary

Problems solved by technology

[0005] However, it is not advisable to increase the discharge amount by increasing the diameter or thickness of the rotor and increasing the rotation rate of the rotor, because the increase in the diameter and thickness of the rotor deviates from the trend of reducing the size of the oil pump rotor, and the rotor rotation rate An increase in pressure can cause cavitation, which can lead to a decrease in pump efficiency, increased friction, and increased noise
[0006] On the other hand, when the number of teeth of the rotor decreases, the eccentric distance between the rotors will increase, so that the discharge will increase; however, due to the small number of teeth, the pulsation of the fluid will be affected by the suction and discharge rates of the oil located at the suction port and the discharge port. The change increases and increases
Therefore, if oil is sucked from a discharge unit due to excessive suction negative pressure, or because air is sucked from a gap in the case, not only the pump will cause cavitation, but also the pump efficiency will decrease
[0007] As explained above, the above method is not suitable for increasing the discharge of the oil pump, that is, this method cannot meet the current requirements of high efficiency and compact structure

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] figure 1 The specifications of the oil pump rotor assembly shown in Embodiment 1 are as follows:

[0029] The diameter Di of the addendum circle of the inner rotor is 40.32mm;

[0030] The diameter "di" of the dedendum circle of the inner rotor is 25.36mm;

[0031] The diameter Do of the dedendum circle of the outer rotor is 48.20mm;

[0032] The diameter "do" of the addendum circle of the outer rotor is 32.92mm;

[0033] Eccentric distance "e" is 3.74mm,

[0034] The base circle radius Ri of the inner rotor is 10.80mm;

[0035] The radius Ro of the addendum arc of the outer rotor is 10.80mm;

[0036] The fillet radius "r" of the outer rotor is 3.00mm;

[0037] The number of teeth "Zi" of the inner rotor is 4;

[0038] The number of teeth "Zo" of the outer rotor is 5;

[0039] The thickness of each tooth is 12.6mm;

[0040] Theoretical emission Vth is 9.32cm3 / rev;

[0041] The area ratio Si / So per tooth was 0.8.

Embodiment 2

[0043] Such as figure 2 The specifications of the oil pump rotor assembly shown in Embodiment 2 are as follows:

[0044] The diameter Di of the addendum circle of the inner rotor is 40.32mm;

[0045] The diameter "di" of the dedendum circle of the inner rotor is 25.36mm;

[0046] The diameter Do of the dedendum circle of the outer rotor is 48.20mm;

[0047] The diameter "do" of the addendum circle of the outer rotor is 32.92mm;

[0048] Eccentric distance "e" is 3.74mm;

[0049] The base circle radius Ri of the inner rotor is 5.90mm;

[0050] The radius Ro of the addendum arc of the outer rotor is 5.90mm;

[0051] The fillet radius "r" of the outer rotor is 5.00mm;

[0052] The number of teeth "Zi" of the inner rotor is 4;

[0053] The number of teeth "Zo" of the outer rotor is 5;

[0054] The thickness of each tooth is 12.6mm;

[0055] Theoretical emission Vth is 9.32cm 3 / rev;

[0056] The area ratio Si / So per tooth was 1.2.

[0057] The area ratio Si / So per too...

Embodiment 3

[0059] Such as image 3 The specifications of the oil pump rotor assembly in the shown embodiment 3 are as follows:

[0060] The diameter Di of the addendum circle of the inner rotor is 40.32mm;

[0061] The diameter "di" of the dedendum circle of the inner rotor is 25.36mm;

[0062] The diameter Do of the dedendum circle of the outer rotor is 48.20mm;

[0063] The diameter "do" of the addendum circle of the outer rotor is 32.92mm;

[0064] Eccentric distance "e" is 3.74mm;

[0065] The base circle radius Ri of the inner rotor is 5.30mm;

[0066] The radius Ro of the addendum arc of the outer rotor is 5.30mm;

[0067] The fillet radius "r" of the outer rotor is 5.00mm;

[0068] The number of teeth "Zi" of the inner rotor is 4;

[0069] The number of teeth "Zo" of the outer rotor is 5;

[0070] The thickness of each tooth is 12.6mm;

[0071] Theoretical emission Vth is 9.32cm 3 / rev

[0072] The area ratio Si / So per tooth was 1.3.

[0073] The oil pump rotor assembl...

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Abstract

An internal gear oil pump rotor assembly which enables the construction of an oil pump that is compact and has high performance. In the oil pump rotor assembly having an inner rotor (10) and an outer rotor (20), the number of teeth 'Zi' of the inner rotor (10) with trochoid tooth profiles is set to be equal to or fewer than '6', and a ratio Si / So is set so as to satisfy the following inequalities: 0.8<=Si / So<=1.3, where Si is a cross-sectional area of one external tooth (11) which is formed outside a root circle (di) that is formed along the bottoms of the external teeth (11) of the inner rotor (10), and So is a cross-sectional area of one internal tooth (21) which is formed inside a root circle (Do) that is formed along the bottoms of the internal teeth (21) of the outer rotor (20).

Description

technical field [0001] The present invention relates to an oil pump rotor assembly for use in a cycloidal type internally geared oil pump through which the volume of the unit located between the inner and outer rotors changes as the inner and outer rotors rotate to mesh with each other for suction and discharge of fluids. Background technique [0002] A conventional oil pump includes an inner rotor having n outer teeth ("n" here represents a natural number), an outer rotor having n+1 inner teeth meshing with the outer teeth, and a housing in which The casing has a suction port for sucking liquid and a discharge port for discharging liquid. Due to the mutual meshing of the inner and outer rotors, the rotation of the inner rotor drives the outer rotor to rotate, sucking and discharging liquid, thus making the inner and outer rotors The volume of the cells in between changes. [0003] Seen in the direction of rotation, each unit is bounded at the front and rear by contact sur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04C2/08F04C2/10
CPCF04C2/084F04C2/102F04C2/10
Inventor 平林胜美木村一郎栗田洋孝细野克明小林孝司
Owner DIAMET CORP
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