CN2480213Y

CN2480213Y - Automatic shafting mechanism for vehicle gearing box

Info

Publication number: CN2480213Y
Application number: CN 01226807
Authority: CN
Inventors: 陈宏伟; 宋健; 张勇
Original assignee: Tsinghua University
Current assignee: Tsinghua University
Priority date: 2001-06-08
Filing date: 2001-06-08
Publication date: 2002-03-06
Anticipated expiration: 2011-06-08

Abstract

The utility model relates to an automatic shift mechanism for vehicle transmissions, and an electric motor is connected with a camshaft through the speed reducer. A circular cam is fixed axially on the camshaft through a key connection, and head faces of the circular cam and a shaft shoulder of the camshaft are separately provided with cam slots. One side of a transmission fork is inserted into two cam slots through a straight pin, and the other side is inserted into a slot of a shift block in the vehicle transmission. The angular displacement sensor is arranged at the end of the camshaft. The shift mechanism of the utility model is suitable for any vehicle which employs the gear-box with fixed shaft, step gear and hand-gear shift, and achieves easy to dispose and implement, compact structure and lower cost.

Description

A kind of vehicle gear box self-clanging gear-shift

The utility model relates to a kind of vehicle gear box self-clanging gear-shift, belongs to the vehicular spare parts technical field.

Be applied to the automatic speed-changing system on the automobile at present, the hydraulic automatic speed variator that the overwhelming majority is made up of turbine transformer and planetary transmission (AT) because the cost height often only is used for high-grade car, is difficult to popularize.The eighties has occurred realizing automated mechanical formula automatic transmission with hydraulic torque converter (AMT) that on the basis of manual-shift gearbox compare with hydraulic automatic speed variator, it has many advantages.Hydraulic actuator is adopted in the manipulation of change speed gear box always in the automatic machincal transmission (AMT), and this mechanism mainly is made up of gear selecting, gear shifting oil cylinder and control electromagnetic valve, realizes gear selecting and gear shift action by control electromagnetic valve.The shortcoming of this mechanism is structure and complex process, and cost is still higher, and bigger power waste is arranged, and has limited the field of application of automatic machincal transmission.

The purpose of this utility model is a kind of vehicle gear box self-clanging gear-shift of design, to overcome the deficiency of above-mentioned prior art, makes electromechanical autoshift actuating unit simple in structure, with low cost, keeps in repair easy to use

The utility model design-calculated vehicle gear box self-clanging gear-shift comprises electrical motor, retarder, camshaft, face cam, one group of control fork and angular-motion transducer.Electrical motor links by retarder and camshaft, and face cam is axially fixed on the camshaft by the key connection, and the end face of the end face of face cam and the camshaft shaft shoulder is respectively equipped with cam path.One end of shift fork is inserted in aforementioned two cam paths by straight pin, and the other end of shift fork inserts in the groove of gear shift shifting block in the automobile gearbox.Angular-motion transducer places the end of camshaft.Electrical motor drives the camshaft rotation by retarder, and angular-motion transducer is measured the corner of camshaft.When electrical motor was rotated in the forward, under the effect of cam path, each control fork is sequentially-operating successively, realizes upgrading; When the electrical motor contrarotation,, realize lowering category according to same principle.

The utility model design-calculated vehicle gear box self-clanging gear-shift, be applicable to any employing fixedly shaft type grade vehicle of gear manual-shift gearbox is arranged, can be on the basis that does not change former change speed gear box inner structure, the hand shift system is carried out automatic improving, be easy to arrange and implement, compact conformation, with low cost, be a kind of pioneering technology of being convenient to promote.

Description of drawings:

Fig. 1 is the structural representation of change speed gear box self-clanging gear-shift.

Fig. 2 is the A-A diagrammatic sketch of Fig. 1.

Fig. 3 is the principle of design scheme drawing of cam profile.

Below in conjunction with accompanying drawing, introduce the detailed content of this practicality in detail.

Among Fig. 1 and Fig. 2, the 1st, casing, the 2nd, supporting shaft, the 3rd, dust boot, the 4th, angular-motion transducer, the 5th, camshaft, the 6th, 1-2 gear shift shift fork, the 7th, 3-4 gear shift shift fork, the 8th, face cam, the 9th, straight pin, the 10th, 5-R gear shift shift fork, the 11st, electrical motor, the 12nd, retarder, the 13rd, 5-R gear shift shifting block, the 14th, 5-R gear shift axle, the 15th, 3-4 gear shift shifting block, the 16th, 3-4 gear shift axle, the 17th, 1-2 gear shift shifting block, the 18th, 1-2 gear shift axle, the 19th, cam path, the 20th, change speed gear box.

As shown in Figure 2, the utility model design-calculated vehicle gear box self-clanging gear-shift comprises electrical motor 11, retarder 12, camshaft 5, face cam 8, one group of control fork and angular-motion transducer 4.Electrical motor 11 links by retarder 12 and camshaft 5, and face cam 8 is axially fixed on the camshaft 5 by the key connection, and the end face of the end face of face cam and the camshaft shaft shoulder is respectively equipped with cam path.One end of shift fork is inserted in aforementioned two cam paths by straight pin 9, and the other end of shift fork inserts in the groove of gear shift shifting block in the automobile gearbox 20.Angular-motion transducer 4 places the end of camshaft 5.

Below in conjunction with accompanying drawing an embodiment of the present utility model is further described.

This embodiment has 5 D Drives and a reverse gear at 5 grades of change speed gear boxs.By Fig. 1 and Fig. 2 as can be known, the described vehicle gear box self-clanging gear-shift of the utility model mainly comprises electrical motor, retarder, camshaft, face cam, one group of control fork, angular-motion transducer, casing and dust boot etc.Casing 1 is installed on the housing of change speed gear box.Camshaft 5 face cams 8 adopt key connecting and camshaft 5 circumferentially fixing, are processed with cam path on the both sides end face of camshaft 5 shaft shoulders and the side end face of face cam 8.

Control fork

6,7,10 and the supporting shaft 2 that is fixed on the casing 1 are hinged, the straight pin of

control fork

6,7,10 1 ends inserts in the cam path of camshaft 5 and face cam 8 end faces, be connected with the cam path higher pair, the other end inserts in the groove of gear

shift shifting block

13,15,17 in the change speed gear box.Adopted three control forks and three cam paths, corresponding with three gear selecting positions of change speed gear box.

Electrical motor 11, retarder 12 drive camshaft 5 rotations, and angular-motion transducer 4 is measured the corner of camshaft 5.When electrical motor 11 was rotated in the forward, under the effect of cam path, each control fork is sequentially-operating successively, realizes upgrading; When electrical motor 11 contrarotations,, realize lowering category according to same principle.

Fig. 3 is the principle of design scheme drawing of cam profile.According to gear figure as can be known, change speed gear box has three gear selecting positions and three shift patterns.Gear selecting and gear shift function must realize by the design of cam profile.As shown in Figure 2, in 360 ° circumference, be the variation range of three gear selecting position mean allocation cam profiles, clockwise turn to forward with horizon by the center of circle, 1-2 shelves cam profile changes in 0～120 °, is circular arc in 120 °～360 ° scopes; 3-4 shelves cam profile changes in 120 °～240 °, is circular arc in 0～120 °, 240 °～360 ° scopes; 5-R shelves cam profile changes in 240 °～360 °, is circular arc in 0～240 ° of scope.Corresponding Neutral Position when cam profile is circular arc.Therefore, when cam rotation, have only control fork to swing at synchronization, other two control forks must be still in Neutral Position, like this, have just realized the gear selecting function.

With 1-2 shelves cam profile is example, the situation when gear shift is described.Its cam profile can be divided into 4 sections in 120 ° non-arc section scope:

Neutral gear advances one grade (0～30 °)

One grade is advanced neutral gear (30 °～60 °)

Neutral gear advances second gear (60 °～90 °)

Second gear advances neutral gear (90 °～120 °)

Cam profile must not have special requirement to the characteristics of motion by one grade, neutral gear, three positions of second gear during gear shift, and therefore four sections cam profiles can adopt the identical and better simply characteristics of motion, and present embodiment adopts the correction type characteristics of motion of uniform movement.The design of 3-4 shelves cam profile and 1-2 shelves all fours no longer illustrate at this.The non-arc section of 5-R shelves cam profile can be divided into two sections:

Neutral gear advances five grades (240 °～285 °)

Reverse gear is advanced neutral gear (315 °～360 °)

As shown in Figure 3,5-R retaining cam profile is manufactured inc form, can avoid five grades of mistimings to hang reverse gear like this.

With position shown in Figure 3 is initial position, when needs upgraded, motor/reducer 10 drove camshaft 5 and rotates counterclockwise, and made 6 swings of 1-2 gear shift shift fork, enter one grade, neutral gear, second gear, neutral gear successively, this moment, 3-4 gear shift shift fork 7 was in the neutral gear quiescence with 5-R gear shift shift fork 10; When cam angle surpassed 120 °, 7 swings of 3-4 gear shift shift fork entered third gear, neutral gear, fourth gear, neutral gear successively, and this moment, 1-2 gear shift shift fork 6 was in the neutral gear quiescence with 5-R gear shift shift fork 10; When cam angle surpassed 240 °, 10 swings of 5-R gear shift shift fork entered five grades, and this moment, 1-2 gear shift shift fork 6 was in the neutral gear quiescence with 3-4 gear shift shift fork 7.Because 5-R shelves cam profile is inc, so camshaft can not continue to rotate counterclockwise after entering five grades, can only oppositely clockwise rotate, and control fork 9,7,6 moves successively, realizes the shift-down action of N → 4 → N → 3 → N → 2 → N → 1 → N → R.

Formulate shift schedule, establishment gear shift control program is by the rotation at single-chip computer control system control motor 11.When the needs gear shift, according to current gear and lifting shelves signal, determine turning to and angular transposition of electrical motor 11, utilize the detection signal of camshaft angle displacement pickup 4 that electrical motor 11 is carried out feedback closed loop control, make camshaft 5 rotate to the target location, realize accurate gear shift.

Claims

1, a kind of vehicle gear box self-clanging gear-shift is characterized in that this mechanism comprises electrical motor, retarder, camshaft, face cam, one group of control fork and angular-motion transducer; Described electrical motor links by retarder and camshaft, face cam is axially fixed on the camshaft by the key connection, the end face of the end face of face cam and the camshaft shaft shoulder is respectively equipped with cam path, one end of described shift fork is inserted in aforementioned two cam paths by straight pin, and the other end of shift fork inserts in the groove of gear shift shifting block in the automobile gearbox; Described angular-motion transducer places the end of camshaft.