The model utility content
The purpose of the utility model provides a kind of gear shift mechanism of uniqueness, only uses a motor, reduces mechanism's complexity, improves automaticity.
For realizing above-mentioned purpose; The scheme of the utility model is: the automatic gear shift mechanism of a kind of gearbox, comprise block selecting mechanism and gearshift, and said gearshift comprises shift motor and the gearshift axle that is rotated by the shift motor driving; 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, and the gearshift axle is provided with the block selecting position of corresponding each declutch shift shaft that distributes vertically; Said block selecting mechanism is an electromagnetism block selecting mechanism: offer the block selecting hole respectively in each place, block selecting position on the outer circumferential face of gearshift axle; Block selecting is provided with bearing pin in the hole; Apply the spring that ejects active force that stretches out the block selecting hole to bearing pin, and drive the electromagnet that bearing pin overcomes spring force withdrawal block selecting hole; Gearshift axle is provided with and drives said gearshift and refer to the electromagnetic actuator device that reciprocatingly slides vertically; Said gearshift refers to or the bearing pin head is provided with when gearshift and refers to slide when touching the bearing pin that is ejected by spring, can make bearing pin be pressed into the chamfer surface in the block selecting hole along gearshift axle, said gearshift refer to the corresponding surface that is slidingly matched of gearshift axle outer circumferential face on offer with the said bearing pin that stretches out state and locate the positioning hole that locking cooperates.
Further, said electromagnetic actuator device comprises the electromagnetic coil that is installed in gearshift axle two ends, and is fixed on the armature that gearshift refers to.
Further, said block selecting hole is a ladder hole, and this ladder hole comprises the path hole section on top and hole, the big footpath section of bottom; Said bearing pin top is in path hole section, and the bearing pin bottom is provided with outer turning edge, and is in hole, big footpath section; The said outer upper-end surface that turns edge cooperates with the ladder end face roof pressure of said ladder hole, and the lower end surface that turns edge outward cooperates with said spring roof pressure; Said spring bottom connects a pretension bolt that screws in from the aperture, big footpath of ladder hole; Said electromagnet is arranged between pretension bolt and bearing pin turn edge outward.
Further, said shift motor is a dual-axle motor, and the one of which axle is connected with described gearshift axle rotating drive, and another axle drives and connects the switching mechanism of an auxiliary transmission high and low shift.The switching mechanism of said auxiliary transmission high and low shift comprises that a leading screw screw straight line moves actuator, and this leading screw screw straight line moves actuator and drives auxiliary connection speed-changing box pulling fork axle.Said leading screw screw straight line moves actuator and comprises and drive the leading screw that is rotationally connected with said dual-axle motor and be located in the nut on the threads of lead screw part, directly contacts, is in transmission connection between nut and the said auxiliary transmission declutch shift shaft.Said dual-axle motor drives through auxiliary transmission clutch and said leading screw and is rotationally connected.
The gear shift mechanism of the utility model; Block selecting mechanism adopts electromagnetism block selecting mechanism; This electromagnetism block selecting mechanism mainly comprises the gearshift axle and endwisely slips, only revolves the gearshift that cooperates with it and refer to that gearshift refers on the gearshift axle, at least two definite block selecting positions are arranged, respectively at least two declutch shift shafts of correspondence.Gearshift refers in each block selecting position all can be spacing by corresponding flexible bearing pin.When bearing pin withdrawal block selecting hole, through electromagnetic actuator device gearshift is referred to impose axial power, just can make gearshift refer to move to vertically next block selecting position.
, always be in releasing state, and when releasing state because only if the bearing pin of each block selecting position is compressed; Because (gearshift refers to or the bearing pin head) has chamfer surface; The gearshift refer to when moving axially, run into the bearing pin head, can bearing pin be compressed, and move to the gearshift refer to position of positioning hole the time; Bearing pin insertion positioning hole refers to spacing for shifting gears, just accomplished the location and the locking of block selecting.Just can carry out gear shift operation then, in the gear shift operation process, bearing pin can play the effect of transmitting torque and power.Gearshift utilizes (gearshift refers to) shift fork to stir declutch shift shaft and shift gears, and shift process and existing technology are similar, repeat no more.
The utility model electricity consumption magnetic separation gear mechanism substitutes motor of the prior art or hydraulic selector of transmission, has avoided motor and hydraulically powered shortcoming, and structure is more terse simultaneously, and automaticity is high.
Below in conjunction with accompanying drawing the utility model is done further detailed explanation.
Like Fig. 1,2, the automatic gear shift mechanism of a kind of gearbox shown in 3; Comprise block selecting mechanism and gearshift, gearshift comprises shift motor 1, and shift motor drives gearshift axle 23 through magnetic clutch 2 and rotates; Only revolving the earth's axis on the gearshift axle 23 has gearshift to refer to 7 to slidable fit; Gearshift refers to be fixed with on 7 shift fork 40, and corresponding shift fork is set side by side with three declutch shift shafts 13,15,16, and gearshift axle 23 is provided with the gear that selects of corresponding each declutch shift shaft that distributes vertically.The declutch shift shaft that gearshift utilizes shift fork 40 to stir correspondence carries out gear shift operation.For reaching definite block selecting position, need utilize block selecting mechanism, present embodiment is introduced a kind of electromagnetism block selecting mechanism.
Offer block selecting hole 24,25,26 respectively in each place, block selecting position on the outer circumferential face of gearshift axle 23, be provided with bearing pin 5,9,29 (as shown in Figure 1, middle bearing pin 29 is referred to that by block selecting 7 block) in the block selecting hole.Like Fig. 3, bearing pin 29 belows are provided with to bearing pin and apply the spring that ejects active force 31,32 that stretches out the block selecting hole, and drive the electromagnetic coil group 30,33 that bearing pin overcomes spring force withdrawal block selecting hole; Bearing pin 29 heads are provided with chamfer surface, when gearshift refers to that the bearing pin 29 that is ejected by spring is touched in 7 edge gearshift axle slips, bearing pin are pressed in the block selecting hole; Gearshift refer to 7 with the corresponding surface that is slidingly matched of gearshift axle 23 outer circumferential faces on offer the bearing pin that supplies the state that stretches out and insert positioning hole with location locking cooperation.Stretch out under the state, bearing pin 29 protrusion gearshift axles 23 outer circumferential face h1 distances, spring 31,32 highly is h2.As other mode of executions, also can refer to that 7 are provided with chamfer surface with the surface of contact of bearing pin 29 in gearshift, or gearshift refer to 7 with bearing pin 29 on all establish chamfer surface.
Gearshift axle 23 is provided with and drives gearshift and refer to 7 electromagnetic actuator devices that slide vertically.Electromagnetic actuator device comprises the electromagnetic coil 3,10 that is installed in gearshift axle two ends, and is fixed on the armature 6,8 that gearshift refers to.This electromagnetic actuator device; Gearshift axle 23 and gearshift refer to not have between 7 the drive mechanism of entity; As other mode of executions, can on gearshift refers to, armature be set yet, and adopt two output mechanisms such as the power-actuated drive link of electromagnetism at gearshift axle two ends; Directly contact is shifted gears and is referred to 7, promotes gearshift and refers to 7 in the electromagnetic force direction slip of gearshift axle upper edge.In addition, can also only at gearshift axle one end an electromagnetic actuator device through spring reset be set, shifting gears through the drive link promotion of ouput force refers to, refers to through the springs return gearshift.
Like Fig. 3, the block selecting hole is a ladder hole, and this ladder hole comprises the path hole section on top and hole, the big footpath section of bottom; Said bearing pin top is in path hole section, and the bearing pin bottom is provided with outer turning edge, and is in hole, big footpath section; The upper-end surface that turns edge outward cooperates with the ladder end face roof pressure of ladder hole, and the lower end surface that turns edge outward cooperates with spring 31,32 roof pressures; Spring 31,32 bottoms connect a pretension bolt 34 that screws in from the aperture, big footpath of ladder hole; Electromagnetic coil group 30,33 is arranged between pretension bolt 34 and bearing pin turn edge outward.As other mode of executions, a choosing shelves hole can be a shape arbitrarily, makes bearing pin stretch out a gearshift axle h1 distance as long as satisfy spring, guarantees that the movement of springs direction gets final product.
The output shaft of gearshift magnetic clutch 2 and gearshift axle 23 are connected through spline or flange, have chute 4 on the gearshift axle 23,23 1 an ends installation PLC controller of shifting gears, and there is PLC guide line hole 27 its inside.Through the PLC controller, the electromagnetic coil group in the control block selecting hole 24,25,26, when the coil groups no electric circuit, bearing pin 29 is stretched out the outer circumferential face of gearshift axle 23 by spring jack-up.Drive gearshift refer to 7 in axial sliding electromagnetic coil 3,10 also receive the control of PLC controller 28, control circuit is as shown in Figure 4.Among the figure, electromagnetic coil 3,10 is respectively for circuit a, b, and the electromagnetic coil group in the block selecting hole 24,25,26 is corresponding line c, d, e respectively, magnetic clutch 2 corresponding line f.Relay main contact in the control wiring is arranged in the loop of corresponding electromagnetic coil.
The detailed process of a block selecting process is described below.Like Fig. 1, gearshift refers to that 7 mediate, if make gearshift refer to that 7 move to a top gear; Through PLC controller control SB5 switch on, the d circuit is connected, coil groups 30,33 energisings; Under the effect of electromagnetic force, bearing pin 29 downward pressure springs move h1 (h2 >=h1); SB2 is closed then, and the b circuit is connected, and electromagnetic coil 10 energisings attract gearshift to refer to the armature 8 on 7; Drive gearshift and refer to that 7 move to it, gearshift refers to that 7 run into the bearing pin 9 that is in the state of stretching out, because surface of contact has chamfer surface, just bearing pin 9 is pressed into block selecting hole 24; Up to moving to position of positioning hole, bearing pin 9 stretches out, and inserts positioning hole; Gearshift refers to that 7 is limited, and SB1 breaks off, the outage of b circuit.When breaking away from middle block selecting position, the SB6 switch breaks off, coil groups 30,33 outages, and bearing pin 29 is returned to the state of upspringing under the effect of spring 31,32 power.Gearshift refers to that 7 refer to that through gearshift the position transducer 11 on 7 obtains with block selecting bit position relation.
After gearshift refers to that 7 block selectings put in place, carry out gear shift operation, at first; The energising of PLC controller control f circuit, magnetic clutch 2 energisings, motor 1 drives gearshift axle 23 and rotates; Because gearshift refers to that 7 only revolve with gearshift axle 23, shift fork 40 is just stirred declutch shift shaft 13 motions, when moving to desired location; Drive range sensor 12 feedback signals, PLC controller control motor 1 stop operating and magnetic clutch 2 outages, hang gear.When needs are hung the gear into declutch shift shaft 15,16, at first, making gearshift refer to that 40 stir declutch shift shaft 13 and are moved back into neutral gear position; Then, carry out block selecting, make gearshift refer to that 7 move to the block selecting position corresponding to declutch shift shaft 15 or 16, carry out gear shift operation then, until drive range sensor 14 or 17 feedback signals, motor 1 stops operating, and hangs gear.
The foregoing description is preferred embodiment a kind of, and the mode of execution from above-mentioned mode of execution is easy to be generalized to two or surpasses three block selecting positions repeats no more at this.In addition, as a kind of mode of execution that is equal to, can the resilient key shaft device (be comprised bearing pin, spring, electromagnet; Spring and bearing pin are fixed) be arranged on gearshift and refer in 7 that correspondence is provided with positioning hole and locate respectively in each block selecting position of gearshift axle 23, its schematic construction is as shown in Figure 5; Gearshift refers to 7 in moving; Bearing pin will fall into positioning hole and play position-limiting action, when needs move, drive spring with electromagnet and will pull out bearing pin.
Be illustrated in figure 6 as a compound transmission that on tractor and heavy-duty car, adopts, existing combiner gearbox, the major-minor gearbox has gear level separately to handle respectively, and spatial arrangement is complicated.Because the gearshift power that when gearshift, needs is bigger, also need distinguish frequent manipulation major-minor gearbox shifting bar, has increased the gearshift time, causes driver fatigue easily.Automobile-used automatic gear shift mechanism of the prior art only improves main-gear box, and auxiliary transmission keeps the manual shift mode, does not have whole automations.And, then be easy to realize the self shifter of compound transmission owing to adopt the scheme of the utility model.
Embodiment 1 based on the utility model; Change motor 1 into dual-axle motor; The output shaft driving auxiliary gearbox that motor 1 increases just keeps off switching mechanism; The switching mechanism of auxiliary transmission high and low shift comprises that a leading screw screw straight line moves actuator, and this leading screw screw straight line moves actuator and comprises leading screw 20 and wear the nut 21 on it, and nut 21 drives auxiliary transmission declutch shift shaft 18.The output shaft of magnetic clutch 22 is connected through spline or flange with leading screw 20; Leading screw 20 adopts with nut 21 and is threaded; Nut 21 is connected with guide block on the auxiliary transmission declutch shift shaft 18; Rotatablely moving of leading screw 20 can form the straight line motion of nut 21 through power screw, moves the conversion that realizes that auxiliary transmission just keeps off thereby drive declutch shift shaft 18 straight lines.19 is position transducer.The The whole control flow process is as shown in Figure 7.