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External gear pump and hydraulic transmission hydraulic system

A hydraulic transmission and hydraulic system technology, applied in the direction of pumps, pump components, machines/engines, etc., can solve the problems of low volumetric efficiency and inability to work at high temperature for a long time, achieve high volumetric efficiency, save required space, The effect of meeting the needs

Active Publication Date: 2017-12-15
SPECIAL VEHICLE TECH CENT OF HUBEI AEROSPACE TECH RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The embodiments of the present invention provide an external gear pump and a hydraulic system of a hydraulic transmission, which can effectively solve the problems of conventional external gear pumps in conventional vehicles that generally have low volumetric efficiency at low speeds and cannot work at high temperatures for a long time. problem, thus meeting the hydraulic automatic transmission's demand for hydraulic oil source

Method used

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  • External gear pump and hydraulic transmission hydraulic system
  • External gear pump and hydraulic transmission hydraulic system
  • External gear pump and hydraulic transmission hydraulic system

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Embodiment 1

[0035] like Figure 1-4 As shown, an external gear pump provided by an embodiment of the present invention is applied to a hydraulic transmission hydraulic system, wherein the hydraulic transmission hydraulic system includes a hydraulic system, a transmission and an oil tank, and the external gear pump includes: a housing and A gear mechanism, the housing is fixedly connected with the transmission case, the inner cavity of the housing is a sealed inner cavity, one side of the inner cavity is provided with an oil pressure port, and the oil pressure port is connected with the hydraulic system, and the other side of the inner cavity is provided with There is an oil suction port, and the oil suction port is connected to the oil tank; the gear mechanism is arranged in the casing, and is movably connected with the casing, one end of the gear mechanism is bonded to the transmission, and the transmission drives the gear mechanism to rotate in the casing; the casing includes the front c...

Embodiment 2

[0048] An external meshing gear pump provided by an embodiment of the present invention is composed of a driving gear 2 and a driven gear 1 with the same number of teeth and modules, and a front housing 4, an intermediate housing 6 and a rear housing 8. The two ends of the gear 2 and the driven gear 1 are supported by needle bearings 3, the front housing 4, the middle housing 6 and the rear housing 8 are sealed by a gasket 5, and the right side of the driving gear 2 is splined by the transmission Driven by the structure, the driving gear 2 drives the driven gear 1 to rotate according to the rotation direction shown by the arrow in the figure, and the volume of the two closed cavities formed between the driving and driven gear 1 and the housing changes when the gears mesh.

[0049] like image 3 , Figure 4 As shown, the front casing is provided with a front casing oil suction port 13-1 and a front casing oil pressure port 12-1, and the rear casing 8 is provided with a rear ca...

Embodiment 3

[0051] In an external gear pump provided by an embodiment of the present invention, the design value of the thickness difference between the driving gear 2 and the driven gear 1 is not greater than 0.01mm. The flatness design index of the sealing surfaces of the front housing 4, the middle housing 6 and the rear housing 8 is 0.012mm, and the surface roughness is Ra1.6; the flat sealing gasket 5 uses the power cable paper GB7969-2003.

[0052] Due to the actual load and operating speed characteristics of the external gear pump, the embodiment of the present invention chooses the open stamped outer ring full complement needle roller bearing, which has a large number of needle rollers and a very high load-carrying capacity. The needle roller bearings must meet the following requirements:

[0053] (1) The basic rated load, fatigue limit load, reference speed and other parameters of the selected bearing must meet the actual working conditions of the bearing;

[0054] (2) Temperatu...

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Abstract

The invention discloses an external-mashed gear pump. The external-mashed gear pump comprises a shell body and a gear mechanism. The gear mechanism is arranged in the shell body and movably connected with the shell body. One end of the gear mechanism is bonded with a hydrodynamic transmission which drives the gear mechanism to rotate in the shell body. The shell body comprises a front shell body, a middle shell body and a rear shell body. A plurality of sealing gaskets are arranged between the front shell body and the middle shell body. A plurality of sealing gaskets are arranged between the middle shell body and the rear shell body. The invention further discloses a hydrodynamic transmission hydraulic system. According to the external-mashed gear pump and the hydrodynamic transmission hydraulic system, the end faces of the shell body are sealed through the sealing gaskets so that the end face gaps of the external-mashed gear pump can be adjusted accurately. Accordingly, the high volume efficiency of the external-mashed gear pump can be obtained, and the using requirement for the service life of the external-mashed gear pump can be met.

Description

technical field [0001] The invention relates to the technical field of hydraulic transmission, in particular to an external meshing gear pump and a hydraulic system of a hydraulic transmission. Background technique [0002] The role of the oil pump in the hydraulic automatic transmission is to generate a certain pressure of hydraulic oil, which is used to supply the hydraulic torque converter, actuators, control systems and valve bodies, and to provide lubrication to the parts that need to be lubricated inside the transmission. The quality of its technology has a great influence on the performance and service life of the hydraulic automatic transmission. [0003] Generally, gear pumps, rotor pumps and vane pumps are the most common in hydraulic automatic transmissions. At present, gear pumps are the most widely used, but the current common external gear pumps have the following disadvantages: [0004] Ordinary external gear pumps generally have low volumetric efficiency at ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F04C2/18F04C15/00
Inventor 夏斯艾银华梁东伟汪新国向雪峰
Owner SPECIAL VEHICLE TECH CENT OF HUBEI AEROSPACE TECH RES INST
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