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Internal-gear-type oil pump for vehicle

An internal meshing, gear-type technology, applied in the direction of rotary piston pump, pump, rotary piston type/oscillating piston type pump components, etc. Insufficient pressure balance and other problems to achieve high efficiency

Inactive Publication Date: 2014-07-09
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in the internal gear oil pump for vehicles as described above, for example, when rotating at a low speed and / or when high oil pressure is generated, there is a gap between the outer peripheral surface of the driven gear and the inner peripheral surface of the pump chamber. The balance of the dynamic pressure generated between them is not sufficient, and there is a problem that the driven gear is unstable or the rotation center of the driven gear is deflected (vibration れる).
The deflection of the center of rotation of the driven gear causes the lubrication state between the outer peripheral surface of the driven gear and the inner peripheral surface of the pump chamber to become a boundary lubrication state, resulting in friction loss and increased rotational resistance of the driven gear. Big

Method used

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  • Internal-gear-type oil pump for vehicle
  • Internal-gear-type oil pump for vehicle
  • Internal-gear-type oil pump for vehicle

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] figure 1 It is a partial sectional view showing a part of a vehicle power transmission device 12 including a vehicle internal gear oil pump (hereinafter, referred to as an oil pump) 10 according to an embodiment of the present invention. The vehicle power transmission device 12 includes a torque converter 16 provided at a rear stage of a crankshaft 14 of an engine serving as a drive source of the vehicle, and a stepped automatic transmission 18 .

[0049] exist figure 1 Among them, the torque converter 16 includes: a pump impeller 20 connected to the crankshaft 14 capable of transmitting power; The input shaft 22 and the stator impeller 28 are disposed between the pump impeller 20 and the turbine impeller 24 and are rotatably supported via the one-way clutch 26 . In the torque converter 16 configured in this way, the rotation of the pump impeller 20 integrally rotating with the crankshaft 14 is transmitted to the turbine impeller 24 via the working fluid. Here, the p...

Embodiment 2

[0104] Next, other embodiments of the present invention will be described. In addition, in the following description, the same code|symbol is attached|subjected to the common part between embodiment, and description is abbreviate|omitted.

[0105] Compared with the oil pump 10 of the first embodiment, the oil pump of this embodiment differs only in that the shape of the first dynamic pressure generating groove 46i is different from that of the first dynamic pressure generating groove 46c of the first embodiment, and the other configurations are substantially the same. .

[0106] like Figure 18 As shown, the depth D1 in the radial direction of the driven gear 46 of the first dynamic pressure generating groove 46i is set so as to extend from the deepest part of the first dynamic pressure generating groove 46i to the inside of the pump body 34, as in the first embodiment. The gap ratio m1 (=h1 / h2), which is the ratio of the distance h1 of the gap H1 on the peripheral surface 3...

Embodiment 3

[0109] Compared with the oil pump 10 of the first embodiment, the oil pump of this embodiment differs only in that the shape of the first dynamic pressure generating groove 46k is different from that of the first dynamic pressure generating groove 46c of the first embodiment, and the other configurations are substantially the same. .

[0110] like Figure 19 As shown, the depth D1 in the radial direction of the driven gear 46 of the first dynamic pressure generating groove 46k is set so as to extend from the deepest part of the first dynamic pressure generating groove 46k to the inside of the pump body 34, as in the first embodiment. The gap ratio m1 (=h1 / h2), which is the ratio of the distance h1 of the gap H1 on the peripheral surface 34c to the distance h2 of the gap H2 from the outer peripheral surface 46b of the driven gear 46 to the inner peripheral surface 34c of the pump body 34, is predetermined. In the range.

[0111] like Figure 19 As shown, the outer peripheral...

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Abstract

Provided is an internal-gear-type oil pump for a vehicle, the oil pump being provided with a driven gear in which the self-aligning effect of the driven gear can be obtained while preventing the fluid friction acting on the driven gear from increasing. First dynamic pressure generation grooves (46c) that concave are formed on the outer circumferential surface (46b) of a driven gear (46). The depths (D1) of said grooves are set such that the gap ratio (m1) of a gap (H1) extending from the deepest part of the first dynamic pressure generation grooves (46c) to the inner circumferential surface (34c) of a pump body (34) relative to a gap (H2) extending from the outer circumferential surface (46b) of the driven gear (46) to the aforementioned inner circumferential surface (34c) is within a predetermined range including the maximum value of the dynamic pressure (P1) generated by means of the first dynamic pressure generation grooves (46c) and the minimum value of a fluid friction coefficient (mu1) acting by means of the first dynamic pressure generation grooves (46c). As a consequence, the fluid friction coefficient (mu1) acting on the driven gear (46) is reduced to a minimum and the dynamic pressure (P1) generated by means of the first dynamic pressure generation grooves (46c) reaches a maximum, thereby obtaining a self-aligning effect of the driven gear (46) while preventing the fluid friction acting on the driven gear (46) from increasing.

Description

technical field [0001] The present invention relates to a vehicle internal gear oil pump including a driven gear, and more particularly to a technique for optimizing the depth of a plurality of grooves recessed on the outer peripheral surface of the driven gear. Background technique [0002] An internal gear oil pump for a vehicle includes: (a) a pump chamber formed by a pump body and a pump cover; (b) an annular driven gear having internal teeth and facing an inner peripheral surface forming the pump chamber. and is rotatably supported by an inner peripheral surface forming the pump chamber; and (c) a driving gear having external teeth meshing with internal teeth of the driven gear, arranged to be able to rotate around the driven gear The center of rotation is eccentric to the center of rotation and drives the driven gear to rotate. For example, Patent Documents 1 and 2 are like this. [0003] Generally, in the internal gear type oil pump for vehicles as described above, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04C15/00F04C2/10
CPCF04C2/084F04C2/102F04C15/0042F04C2240/54F04C2240/56F04C18/08
Inventor 本田裕康
Owner TOYOTA JIDOSHA KK
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