CN103322156A

CN103322156A - Gear box for discharging transmission fluid

Info

Publication number: CN103322156A
Application number: CN2013100932798A
Authority: CN
Inventors: T.A.柯蒂斯
Original assignee: GM Global Technology Operations LLC
Current assignee: GM Global Technology Operations LLC
Priority date: 2012-03-23
Filing date: 2013-03-22
Publication date: 2013-09-25
Anticipated expiration: 2033-03-22
Also published as: DE102013204907A1; DE102013204907B4; CN103322156B

Abstract

The gear boxes have high-pressure system which is partly filled with gear box fluid with a first pressure. The low pressure systems are partly filled with gear box fluid with a second pressure lower than first pressure. The diffusers in fluid communication with the high and low pressure systems, are provided with inlets for receiving transmission fluid from high pressure system, and outlets (34,134) for discharging the transmission fluid to the low pressure system. The cross sectional area of the outlet of the diffuser is greater than the cross sectional area of inlet of diffuser.

Description

Speed changer control fluid diffuser

Technical field

The present invention relates to the management of transmission fluid in mixed power and the traditional speed changer.

Background technique

The speed changer that automobile and other vehicles use fluid to fill comes power and the torque axis of in the future autonomous prime mover to become outputting power and moment of torsion.The part of the speed changer that fluid is filled can be by one or more pump pressurizations.

Summary of the invention

A kind of speed changer is provided.This speed changer comprises and at least part ofly is filled with high tension loop that the transmission fluid that is under first pressure fills and at least part ofly is filled with the low tension loop that is in the transmission fluid under second pressure.Second pressure is lower than first pressure.Speed changer also comprises diffuser, and this diffuser is communicated with high tension loop and low tension loop fluid.

This diffuser comprises entrance, and this entrance has first cross sectional area, and receives transmission fluid from high tension loop.This diffuser also comprises outlet, and this outlet has second cross sectional area, and transmission fluid is discharged to low tension loop.Second cross sectional area of this diffuser is greater than first cross sectional area.

When understanding by reference to the accompanying drawings, above-mentioned feature and advantage of the present invention and other feature and advantage are very apparent from following realization optimal modes more of the present invention defined in the appended claims and other embodiments' detailed description.

Description of drawings

Fig. 1 is the schematic representation of hybrid gearbox;

Fig. 2 is the diagrammatic plan view that side cover removes to show the speed changer of the diffuser in the case of transmission;

Fig. 3 is the axonometric drawing such as schematic from the entrance region of the diffuser of Fig. 2 and exit region; With

Fig. 4 is the axonometric drawing such as schematic of the entrance region of alternative diffuser and exit region.

Embodiment

With reference to accompanying drawing, wherein, under any possibility situation, reference character similar in whole a few width of cloth accompanying drawings has shown speed changer 10 corresponding to similar or similar parts among Fig. 1, and it can use with various vehicle (not shown).Speed changer 10 shows with high-level schematic, and illustrates for the tradition of vehicle and a lot of different structures of hybrid gearbox.

Described in detail though the present invention uses about automobile, those of skill in the art will recognize applicability widely of the present invention.The person having ordinary skill in the art will recognize, for example terms such as " top ", " below ", " making progress ", " downwards " are used for using in descriptive manner about accompanying drawing, do not represent to limit the scope of the invention, scope of the present invention is defined by the following claims.Any numeral, label, for example " first " or " second " only is illustrative, and the scope that is intended to not limit the present invention in any way.

Speed changer 10 comprises case of transmission 12, and it centers on and surround the miscellaneous part of speed changer 10 usually.Valve body assembly 14 receives and distributes to come the pressure fluid of self-pumping 16.

Pump 16 can be motor-drive pump or the mechanical pump that driven by one or more main prime mover (not shown) of speed changer 10 directly or indirectly.Pump 16 also can be torque-converters.Working fluid can be automotive transmission fluid or oil, maybe can be any other suitable working fluid.

High-pressure area or high tension loop 18 are filled with the transmission fluid that is under first pressure, and this first pressure is the elevated pressure of coming self-pumping 16.High tension loop 18 is usually around valve body assembly 14, and can be therefore has a plurality of elevated pressure according to the structure of valve body assembly 14.

Low tension loop 20 at least part of transmission fluid that are under second pressure that are filled with, this second pressure is lower than first pressure.Low tension loop is not pumped, and can be in or near external pressure.

Speed changer 10 further comprises first clutch 22, and it is fluid-actuated clutch and second clutch 24, and it also is the fluid-actuated clutch.Valve body assembly 14 is communicated with first clutch 22 and second clutch 24 fluids, and be configured to selectively activate first clutch 22 and second clutch 24 both.Speed changer 10 also comprises motor 26, so speed changer 10 can be called as hybrid gearbox 10.

Diffuser 30 is communicated with high tension loop 18 and low tension loop 20 fluids.Diffuser 30 can be placed on the outlet port of valve body assembly 14, so that it selectively receives pressure fluid from valve body assembly 14.

Diffuser 30 has entrance 32 and outlet 34.Entrance 32 has first cross sectional area, and receives transmission fluid from high tension loop 18.Outlet 34 has second cross sectional area, and it is greater than first cross sectional area, and transmission fluid is discharged to low tension loop 20.

Usually, first pressure of high tension loop 18 refer to by or approach to very much the pressure that the fluid of the entrance 32 of diffuser 30 provides.Diffuser 30 stands the pressure difference between high tension loop 18 and the low tension loop 20.Maximum pressure differential may appear in the discharging event procedure, and wherein one or two in first clutch 22 and the second clutch 24 is by fast evacuation.Diffuser 30 is reduced in the speed of the transmission fluid that flows between valve body assembly 14 and the case of transmission 12.This speed reduces the noise that can reduce by the inner member generation of transmission fluid bump case of transmission 12 or speed changer 10.

Referring now to Fig. 2, and continue to have shown the schematic representation of speed changer 110 among Fig. 2 with reference to Fig. 1 that it is some the illustration in the structure that schematically shows among Fig. 1.Speed changer 110 comprises case of transmission 112, and it centers on and encapsulate the miscellaneous part of speed changer 110 usually.

Valve body assembly 114 major parts are hidden from view, just receive and distribute to come the pressure fluid of self-pumping (not shown).Speed changer 110 also comprises the high tension loop (hiding from view) that is positioned at valve body assembly 114 and the low tension loop 120 that is positioned at the remaining part of case of transmission 112.Case of transmission 112 shows that side cover partly is removed, so that inner member to be shown better.

Speed changer 110 comprises diffuser 130, and this diffuser 130 is arranged between high tension loop and the low tension loop 120.During valve body assembly 114 was just discharging the automotive transmission fluid, diffuser 130 is transmitting fluid between high tension loop and low tension loop 120.Diffuser 130 provides a space, and oil supply and discharge slowed down before the low tension loop 120 that enters case of transmission 112 and expands.Diffuser 130 therefore can strengthen in the valve body assembly 114 flow at high speed to case of transmission 112 slowly many flow and lower pressure between transformation.

The transmission fluid that the entrance 132 of diffuser 130 receives from high tension loop, and the outlet 134 of speed changer 130 is discharged to low tension loop 120 with transmission fluid.The view of entrance 132 major parts from Fig. 2 hidden.Entrance 132 has first cross sectional area, and outlet 134 has second cross sectional area, and this second cross sectional area is greater than first cross sectional area.In the structure shown in Fig. 2, the entrance 132 of diffuser 130 is arranged on the highest fluid circuit for any fluid clutch (not shown) of speed changer 110 with respect to gravity.

Also with reference to Fig. 3, and continue with reference to Fig. 1-2, shown another view of the diffuser 130 shown in Fig. 2 among Fig. 3.Fig. 3 has shown the axonometric drawing that waits of diffuser 130, and it is with respect to the rotation of the view shown in Fig. 2, to show entrance 132 and outlet 134 better.

First cross sectional area of the entrance 132 of diffuser 130 is arranged with the angle of 90 degree with respect to outlet 134 and second cross sectional area of diffuser 130 at least.Outlet 134 is substantially perpendicular to entrance 132.Cross sectional area can intercept the surface for the plane basically that can cover entrance 132 and outlet 134.

Diffuser 130 also is included in entrance 132 and exports between 134 and partly form and exports 134 relative wall 136.This relative wall 136 is the plane structures that are substantially perpendicular to the flow direction of the transmission fluid by entrance 132.In other words, relative wall 136 is arranged essentially parallel to first cross sectional area of entrance 132.

In the discharging event procedure, wherein one or more clutches are drained transmission fluid, and the pressure ratio between high tension loop and the low tension loop 120 is equal to or greater than 100.But in some cases, pressure ratio can be up to 500.

Under the situation that does not have diffuser 130, the high speed transmission fluid of leaving valve body assembly 114 may be impacted the miscellaneous part of case of transmission 112 or speed changer 110.But, diffuser 130 transmission fluid enter case of transmission 112 may the low tension loop 120 for surrounding environment before, reduced the speed of transmission fluid.

Changing shape and the entrance 132 of diffuser 130 and export 134 relative size can influence the speed that obtains by diffuser 130 and reduce.Diffuser 130 can have and is equal to or greater than four first cross sectional area and the diffuser area ratio between second cross sectional area.In the structure shown in Fig. 2 and 3, the real area of diffuser 130 ratio is about 4.6.Shown diffuser 130 stands at entrance 132 and exports between 134 the reduction between 75-85% of the speed of the oil that flows.

Diffuser 130 can be formed by nylon.Alternatively, diffuser 130 can be formed by metal, plastics or other suitable materials.

Referring now to Fig. 4, and continue with reference to Fig. 1-3, shown the axonometric drawing that waits of diffuser 230.Fig. 4 has shown from the diffuser of seeing to the similar visual angle of the diffuser 130 shown in Fig. 3 230.Diffuser 230 also can use with the speed changer 110 shown in Fig. 2.

The entrance 232 of diffuser 230 receives high-pressure liquids, and outlet 234 is discharged to the area of low pressure with transmission fluid.The area ratio of the diffuser 230 shown in Fig. 4 is about 4.2.

First cross sectional area of the entrance 232 of diffuser 230 is arranged with the angles of about 90 degree with respect to second cross sectional area of the outlet 234 of diffuser 230 equally, so that export 234 perpendicular to entrance 232.But diffuser 230 is not included in the planar wall that entrance 232 places are substantially perpendicular to the transmission fluid flow direction.

Below shown in table 1 show the simulation test result of diffuser 130 and diffuser 230.Computational fluid dynamics software is used in this test.The working fluid that is used for this test is the automotive transmission fluid (AFT) under about 30 degrees centigrade, and it also can be called as transmission oil.Two pressure differences be applied to diffuser 130 and diffuser 230 both.

As shown in table 1, diffuser 130 shows better relatively than diffuser 230 aspect the mean velocity of fluid of low pressure reducing to lead to from high-pressure spray.Diffuser 130 when pressure difference is 100 kPas (kPa) and pressure difference show better when being 500 kPas.But the result shown in the table 1 does not show that diffuser 230 or other diffuser structures are not useable for reducing the oil extraction transmitting speed.Concrete numerical value used herein and unit only are exemplary, and the scope that does not limit the present invention in any way.

Detailed description and figure or accompanying drawing are to support of the present invention and description, but scope of the present invention only is defined by the claims.Realize claimed optimal mode of the present invention and other embodiments though described in detail, exist plurality of replaceable design and embodiment to put into practice the present invention defined in the appended claims.

Cross reference

The application requires the rights and interests of the U.S. Provisional Patent Application 61/614,873 of submission on March 23rd, 2012, and the disclosure of this application is incorporated herein by reference at this.

Claims

1. speed changer comprises:

High tension loop, its at least part of transmission fluid that is under first pressure that is filled with;

Low tension loop, its at least part of transmission fluid that is under second pressure that is filled with, this second pressure is lower than first pressure; With

Diffuser, it is communicated with high tension loop and low tension loop fluid, and wherein said diffuser comprises:

Entrance, it has first cross sectional area, and from high tension loop receive transmission fluid and

Outlet, it has second cross sectional area greater than first cross sectional area, and transmission fluid is discharged to low tension loop.

2. speed changer according to claim 1 also comprises:

Fluid clutch, it has fluid circuit; With

Valve body, it is communicated with the fluid circuit fluid, and disposes for the actuating fluid clutch, and wherein said valve body is the part of high tension loop.

3. speed changer according to claim 2, first cross sectional area of wherein said diffuser is substantially perpendicular to second cross sectional area.

4. speed changer according to claim 3, wherein the pressure difference between high tension loop and the low tension loop is equal to or greater than 100 kPas.

5. diffuser according to claim 4, wherein diffuser has and is equal to or greater than four first cross sectional area and the diffuser area ratio between second cross sectional area.

6. speed changer according to claim 5, wherein low tension loop is under the ambient pressure basically.

7. speed changer according to claim 6, wherein the entrance of diffuser is arranged on the fluid circuit for fluid clutch with respect to gravity.

8. speed changer according to claim 7 further comprises motor, and therefore described speed changer is hybrid gearbox.

9. speed changer according to claim 8, wherein diffuser is formed by nylon.

10. speed changer according to claim 9, wherein diffuser comprises the planar wall of first cross sectional area that is arranged essentially parallel to entrance.