CN202349182U - Cam type gear selection and shifting mechanism - Google Patents

Abstract

The utility model relates to a cam selection and shifting mechanism, which includes a selection mechanism and a shifting mechanism. The selection mechanism is a cam selection mechanism, which includes a cylindrical rotary cam whose rotation axis is parallel to the shifting axis, and a rotary groove of the cylindrical rotary cam. The middle guide slide is equipped with a driven roller that moves linearly along the axis of rotation when the cylindrical rotary cam rotates. The driven roller is connected to a shift finger through a driven rod fixed to it. The shift finger moves along the shift The shaft is axially limited and rotated on the shift finger; the cam selection and shifting mechanism also includes a double-shaft motor, and the two output shafts of the double-shaft motor are respectively driven and connected to the cam and the shift shaft. The gear selection mechanism is a cylindrical rotary cam transmission mechanism. By driving the cylindrical cam to rotate, the roller is driven to move along the groove line on the surface of the cylindrical cam, so that the driven rod drives the shift finger to slide along the shift shaft to the position of the corresponding shift fork shaft. , so as to realize the gear selection.

Description

Cam selector shift mechanism

technical field

The utility model relates to the field of wheel gear shifting mechanisms, in particular to an electronically controlled mechanical gear shifting mechanism for tractors. the

Background technique

In recent years, with the advancement of vehicle automatic transmission technology, the research on automatic transmission products in our country has been greatly developed, and different types of automatic transmissions have appeared one after another. Tractors need a large shifting force when shifting gears, and the frequent operation of traditional manual shifting is likely to cause driver fatigue. The application of automatic transmission on tractors and the research on automatic transmission technology of tractors have been paid more and more attention. Most of the gear selection and shifting mechanisms of electronically controlled mechanical automatic transmissions for vehicles in the prior art are hydraulically controlled, and generally adopt dual hydraulic cylinders X-Y orthogonal arrangement, the control structure is relatively complicated, there are many control elements, and the manufacturing cost is high; The performance of the hydraulic system is greatly affected by temperature, which limits the use area to a certain extent; in addition, the hydraulic components have relatively high requirements for processing accuracy, the manufacturing and processing of the solenoid valve is relatively complicated, and the control accuracy is low; hydraulic oil is easy to leak and pollute the environment. the

Utility model content

The purpose of the utility model is to provide a tractor electronically controlled mechanical automatic transmission gear selection mechanism with compact structure, easy installation and convenient operation, so as to solve the problems of complex structure and inconvenient control of the existing gear selection actuators. the

In order to achieve the above object, the solution of this utility model is: a cam selection and shifting mechanism, including a gear selection mechanism and a shifting mechanism. A shift finger is slidingly assembled, and a shift fork is fixed on the shift finger, and at least two shift fork shafts perpendicular to the shift shaft are arranged in parallel corresponding to the shift fork; the gear selection mechanism is a cam gear selection mechanism, including a rotation axis The cylindrical rotary cam is arranged parallel to the gear shift shaft. The guide slide in the rotary groove of the cylindrical rotary cam is equipped with a driven roller that moves linearly along the rotation axis when the cylindrical rotary cam rotates. The driven roller passes through the driven rod fixed to it. It is connected with a gear shift finger, and the shift finger is rotated and assembled on the shift finger along the axial direction of the shift shaft; the cam selection and shift mechanism also includes a double-axis motor, and the double-axis The two output shafts of the motor are respectively driven and connected to the cam and the shift shaft through respective corresponding clutches. the

The two output shafts of the double-shaft motor are parallel, and one of the output shafts is connected to the cam or the shift shaft through a bevel gear transmission mechanism and a worm gear mechanism in turn. The shift shaft is engaged with the shift finger through a spline for anti-rotation. One end of the driven rod is welded to the driven roller, and the other end is hinged to the shift finger. the

The gear selection mechanism of the utility model is a cylindrical rotary cam transmission mechanism. By driving the cylindrical cam to rotate, the roller is driven to move along the groove line on the surface of the cylindrical cam, so that the driven rod drives the shift finger to slide along the shift shaft. Slide to the position of the corresponding shift fork shaft to realize gear selection. The shifting mechanism includes a shifting shaft and a shifting finger cooperating with the shifting shaft through splines. When the shifting shaft rotates, it drives the shifting finger to rotate, thereby driving the shift fork, and the corresponding shift fork shaft moves to the appropriate gear. position to achieve gear shifting. the

Description of drawings

Fig. 1 is the structural diagram of the gear selection mechanism of the present utility model;

Fig. 2 is a structural diagram of the driven rod of the present utility model;

Fig. 3 is a structural diagram of the shift finger of the present utility model;

Fig. 4 is a structural diagram of the shift fork shaft of the present invention.

Detailed ways

Below in conjunction with accompanying drawing, the utility model is described in further detail. the

As shown in Figure 1, a gear selection mechanism for tractors includes a gear selection mechanism and a gear shift mechanism. The gear shift mechanism includes a gear shift shaft 9, and the gear shift finger 8 is locked with the gear shift shaft 9 through splines. Cooperate, and can do axial sliding along shift shaft 9. A shift fork 81 is fixed at the lower end of the shift finger 8, and three shift fork shafts 12, 14, 15 perpendicular to the shift shaft are arranged in parallel corresponding to the shift fork 81. the

The gear selection mechanism is a cam gear selection mechanism, including a cylindrical rotary cam 4 arranged parallel to the shift shaft 9, the driven roller 5 of the cam is welded to one end of a driven rod 6, and the other end of the driven rod 6 is connected to the gear shifter. The finger cover 30 is hinged. When the cylindrical cam rotates, its driven roller will drive the driven rod 6 to move in a straight line (along the shift shaft 9). As shown in Figure 2 and Figure 3, the head A of the driven rod 6 is a double clevis structure with holes B and C; one end of the shift finger 30 is provided with a hole D, which is matched with the holes B and C and inserted into a pin to form a Articulated structure. The shift finger cover 30 is sleeved in the slide groove on the shift finger 8 and can rotate freely, but the axial movement along the shift finger is limited. the

The cam selection and shifting mechanism also includes a double-shaft motor 2 with two output shafts, the two output shafts are parallel to each other, and the cylindrical cam 4 and the shifting shaft 8 are respectively driven and connected by respective clutches 1 and 3, and one output shaft is connected to the shifting shaft. Between 8, there are bevel gear transmission mechanism and worm gear mechanism 18, 17 in turn, 18 is a worm, 17 is a worm wheel, 20 is a small bevel gear, and 19 is a large bevel gear. Through two mechanisms that change the transmission direction, the biaxial The motor 2 can drive the cylindrical cam 4 and the shift shaft 9 to rotate in the same direction. As another embodiment, a double-shaft motor with two vertical output shafts can also be used. In this case, only one worm gear mechanism or bevel gear transmission mechanism is required. the

As shown in Figure 4, the I reverse gear miniature linear displacement sensor 11 is installed on the I reverse gear shift fork shaft 12, the II III gear miniature linear displacement sensor 13 is installed on the II III gear shift fork shaft 14, and the IV and V gear miniature linear displacement sensors 16 are installed On the shift fork shaft 15 of IV and V gears. the

Take the shift from gear I to gear II as an example for specific description: first, the electronic control unit controls the electrification of the gear selection electromagnetic clutch 3 to enter the engaged state, and then the motor 2 is electrified to rotate, driving the cylindrical cam 4 to rotate, and the cam roller 5 is driven by the cam The lever 6 drives the shift finger 8 to move along the spline shaft 9. When it reaches the guide block 22, the gear selection position sensor 10 feeds back a signal, the electronic control unit controls the motor 2 to stop rotating, and the gear selection electromagnetic clutch 3 is powered off; The gear electromagnetic clutch 1 is energized and enters the engagement state, the motor 2 is energized and rotates, and the spline shaft 9 is driven to rotate through the small bevel gear 20, the large bevel gear 19, the worm 18, and the worm wheel 17, and then the shift finger 8 moves the guide block 22 to drive the I The reverse shift fork shaft 12 moves, and when it moves to the set position, the I reverse gear shift position sensor 11 feeds back the signal, the electronic control unit controls the motor 2 to stop rotating and the shift electromagnetic clutch 1 is powered off, and the I gear is engaged. When the second gear needs to be engaged, first, the electronic control unit controls the shifting electromagnetic clutch 1 to be energized and engaged, and then the motor 2 is energized to rotate, and the spline shaft 9 is driven by the mechanism of the small bevel gear 20, the large bevel gear 19, the worm 18, and the worm gear 17. Turn, so that the shift finger 8 moves the guide block 22 to drive the I reverse shift fork shaft 12 to move back to the neutral position, the electronic control unit controls the motor 2 to stop rotating and the shift electromagnetic clutch 1 is powered off; then, the gear selection electromagnetic clutch 3 Power on, the motor 2 drives the cylindrical cam 4 to rotate, and the cam roller 5 drives the shift finger 8 to move down along the spline shaft 9 through the cam follower rod 6. When the shift finger 8 reaches the guide block 23, the gear selection position sensor 10 feedback signal, the electronic control unit controls the motor 2 to stop rotating and the gear selection electromagnetic clutch 3 is powered off; finally, the electronic control unit controls the shift electromagnetic clutch 1 to be energized, and the motor 2 is energized to rotate, through the small bevel gear 20, the large bevel gear 19 and The worm 18 and worm gear 17 mechanism drives the spline shaft 9 to rotate, and then the shift finger 8 moves the guide block 23 to drive the shift fork shaft 14 of the II/III gear to move. Make motor 2 stop rotating and shift electromagnetic clutch 1 power-off, put into II gear. In addition, the three guide blocks 21, 23, 22 are not only used to move the corresponding shift fork shaft, but also as shown in Figure 4, their respective shift grooves are correspondingly connected to form a guide groove 24 along the direction of the shift shaft during gear selection. , It can also play a righting role when selecting files. the

The above is an example of shifting from gear I to gear II to illustrate the principle of the technical solution. The utility model is not limited thereto, and is applicable to the multi-gear requirements of tractors. the

Claims (4)

1. cam gear shift mechanism; Comprise block selecting mechanism and gearshift, said gearshift comprises a gearshift axle, and only revolving the earth's axis on the gearshift axle has gearshift to refer to slidable fit; Gearshift refers to be fixed with shift fork, and corresponding shift fork is set side by side with at least two declutch shift shafts perpendicular to the gearshift axle;

It is characterized in that; Said block selecting mechanism is a cam block selecting mechanism; Comprise the cylinder turning cam that rotation axis and gearshift axle laterally arrange; In the turning slot of cylinder turning cam there be when the cylinder turning cam rotate along the straight-line roller follower of rotation axis the guiding slidable fit, roller follower is through being in transmission connection with its a fixing follower lever and a gearshift fingerstall, and this gearshift fingerstall is assemblied in said gearshift along an axial limiting ground rotation of shifting gears and refers to;

Said cam gear shift mechanism also comprises a dual-axle motor, and two output shafts of this dual-axle motor drive respectively through each self-corresponding clutch and connect said cam and gearshift axle.

2. cam gear shift mechanism according to claim 1 is characterized in that, two output shafts of said dual-axle motor are parallel, and one of them output shaft is connected to said cam or gearshift axle through bevel gear drive mechanism and worm-and-wheel gear successively.

3. based on the described cam gear shift mechanism of claim 1, it is characterized in that said gearshift axle and said gearshift refer to only revolve through spline and cooperate.

4. cam gear shift mechanism according to claim 1 is characterized in that, said follower lever one end and the welding of said roller follower, and the other end and said gearshift fingerstall are hinged.

Images