CN2473027Y - Double middle shaft automobile speed changer - Google Patents

Abstract

The utility model relates to an automotive mechanical transfer device, in particular to an 8X twin countershaft transmission. The utility model is characterized in that a synchronizer is connected to axle 2 of a main tank of a former twin countershaft transmission and the axle 2 and the gear connecting with the axle 2 are relocatable. The synchronizer can be an inertial lockpin synchronizer with friction cone and the two baulk rings of the synchronizer are connected with each other by three limit rings and six cap screws. One-axle gear and each forward gear that is arranged on the axle 2 has synchro cone respectively. The utility model has the advantages of portable operation, reliable usage, simple structure, easy manufacturing and installation and convenient maintenance.

Description

A kind of pair of tween drive shaft Automotive transmission

The utility model belongs to a kind of automobile mechanical transmissions, particularly about the two tween drive shaft Automotive transmissions of a kind of eight speed.

The two layshaft gearbox of the change-speed box technology of U.S. Eton (EATON) company production at present, its main tank part is tape synchronizer not, like this, the driver in gearshift procedure, must step on the bipod power-transfer clutch, during also must bang throttle one time, operation is made troubles to speed-change and gearshift, especially influences this use of series change-speed box on luxury motorcoach.

The purpose of this utility model is: provide a kind of manipulation light, use reliable, simple in structure, be easy to processing and manufacturing, installation and maintenance are convenient, can satisfy engine output and be the change-speed box that the various automobile of 191～228KW requires.

The technical solution of the utility model is: design a kind of pair of tween drive shaft Automotive transmission, it is characterized in that: it is connected with synchro on two of the main tanks of former pair of tween drive shaft Automotive transmission; Two and the gear that is connected on two float.

Described synchro can be the lockpin-type inertia synchronizer that cone of friction is arranged, and its two baulk rings are linked together by six screws by three lock pins.Described two last each D Drive gears and a shaft gear all have the synchronous conical surface.The synchronous tooth of described synchro is with female splines and male splines.

The utility model and known technology contrast are as follows:

The main tank of the two tween drive shaft Automotive transmissions of known technology is tape synchronizer not, to hang third gear is example, then be equivalent to synchronous tooth cover and the directly engagement under the effect of three fourth gear shift forks of two 3rd gears, this moment is because the tooth cover certainly exists speed discrepancy between the two with gear, just because the difference of driver driving skill level can guarantee that speed discrepancy is less relatively, so during gear shift, the tooth cover just produces impact with the interior male splines of gear, causes the gear shift difficulty.Automotive transmission of the present utility model is connected with synchro on two of main tanks, when the driver will hang third gear, handle the joystick of operator's compartment, making three fourth gear shift forks drive three shift fork shaft No 4s through speed change leverage transmission device moves right, the fork pin of shift fork promotes synchronous tooth cover again and axially moves, and the tooth cover drives locating dowel pin and axially moves together again by one group of uniform hole on its disc synchronously, when the end face of locating dowel pin hit the end face of baulk ring, baulk ring moved axially.When the male cone (strobilus masculinus) of its inner conical surface and two 3rd gears rubs mutually, baulk ring drives lock pin and rotates an angle, the conical surface in another uniform group hole and the annular groove conical surface of lock pin offset on the at this moment synchronous tooth cover disc, the tooth cover stops to move synchronously, but still driver's applied force continuous action is arranged on it, friction force between two conical surfaces has overcome after the speed discrepancy of two adjacent gears, tooth overlaps just baulk ring and angle of lock pin backward rotation relatively synchronously, the tooth cover just can be crossed the locking face on the lock pin smoothly and continue reach synchronously, at this moment, the tooth cover equates with two 3rd gear rotating speeds synchronously, when thereby the male splines of tooth cover is meshed with the female splines of two 3rd gears synchronously, there is not speed discrepancy, can realizes not having the engagement of impact, make shift control light.The synchronous tooth of described synchro is with female splines and male splines, can reduce a synchronous toothholder of conventional synchronizer like this, and is simple in structure.

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

Accompanying drawing 1 is the axial principal section structural representation of embodiment.

Because structure becomes symmetric relation, has wherein omitted a countershaft assembly.

Among the figure: 1, one; 2, a shaft gear; 3, three fourth gear baulk rings; 4, lock pin; 5, synchronous tooth cover; 6, three fourth gear shift forks; 7, flathead screw; 8, two 3rd gears; 9, three shift fork shaft No 4s; 10, two shaft gear adjusting pads; 11, two shaft gear spline pads; 12, locating ring; 13, two seconds speed gear; 14, locating ring; 15, locating ring; 16, pay the case driven wheel; 17, bearing; 18, locating ring; 19, locating ring; 20, a second gear synchro; 21, three fourth gear baulk rings; 22, synchronizer spring; 23, third-speed gear of intermediate shaft; 24, tween drive shaft; 25, tween drive shaft transmission gear; 26, locating dowel pin; 27, two.

Shown in the accompanying drawing 1: be connected with the lockpin-type inertia synchronizer on two 27, it has the friction angle, and the capacity of synchro is increased.Synchronously tooth cover 5 is loaded on equal diameter, has on two 27 of invoice serration, can rotate with two 27, and can endwisely slip.Overlap at synchronous tooth and along the circumferential direction to be evenly equipped with six holes on 5 disc, wherein every three uniform Kong Weiyi groups, the diameter difference in two groups of holes, two locating dowel pins 26 wherein are installed in each hole of one group, between two locating dowel pins 26 synchronizer spring 22 is housed, there is annular groove at the middle part of locating dowel pin, and the conical surface of annular groove and respective aperture is adjacent under the elastic force effect of synchronizer spring 22, on neutral gear position, can prevent the synchro end float misalignment like this; Two three fourth gear baulk rings 3 and 21 link together by three locating dowel pins 4, fastening by flathead screw 7, three locating dowel pins 4 pass synchronous tooth and overlap another group hole on 5 disc, and there is the taper annular groove at the middle part of locating dowel pin 4, can form the locking face with the conical surface at two ends, corresponding hole.One second gear synchro, 20 structures are with roughly the same above-mentioned.

Gear on two, as two seconds speed gear 13, two 3rd gears 8 all are two shaft gear adjusting pads 10, two shaft gear spline pads 11, locating ring 12 and two 27 bonded assemblys by in groups, gear has certain amount of floating at radial direction, in order to the processing that compensates two countershaft-gears, installation error and two skews that cog that produce, make gear meshing smooth-going, do not have rigidity to interfere; Paying case driven wheel 16 is positioned by snap ring 15, bearing 17, snap ring 14; Two 27 by snap ring 18, pair case driven wheel 16 and snap ring 19 location.

Have spiral grooves on the cone of friction of baulk ring, purpose is to destroy the oil film that is present between the cone of friction, also has some axial grooves on the conical surface, so that the oil that is present on the conical surface releases fast, thereby improves frictional behaviour.

The female splines parameter of synchronous teeth cover that is installed in two cover synchros on two 27 of the equal diameters is identical, can use same the broaching tool manufacturing to be processed; The male splines parameter of two synchronous teeth cover is also identical, like this can general one pinion cutter; And the long invoice serration on two 27 can adopt gear hobbing technology efficiently; In addition, a shaft gear 2, two female splines parameters that go up each grade gear are all identical, also only need samely come processing and manufacturing to broaching tool.Greatly reduce productive costs.

Manipulation of the present utility model and working process are summarized as follows:

When driving, after the driver plucked shelves, each other parts of change-speed box were position shown in the accompanying drawing 1.This moment, power was passed on one 1 by driving engine, power-transfer clutch, pass on the shaft gear 2 through invoice serration, a shaft gear 2 is meshed with tween drive shaft transmission gear 25 again, and power passes on the tween drive shaft 24, each grade gear is owing to be fixed together with tween drive shaft, so rotate together on this moment tween drive shaft.Each grade gear that each grade gear drives again on two on the tween drive shaft rotates together because the synchronous tooth cover of each synchro is in Neutral Position, so two go up each grade gears and also be in idling conditions, no power takeoff on two 27.

When the driver will hang third gear, handle the joystick of operator's compartment, making three shift fork shaft No 4s 9 drive three fourth gear shift forks 6 through speed change leverage transmission device axially moves to right, the fork pin of shift fork promotes synchronous tooth cover 5 again and moves axially, tooth cover 5 is again by one group of uniform hole on its disc synchronously, drive locating dowel pin 26 and axially move together, when the end face of locating dowel pin 26 hit the end face of baulk ring 21, baulk ring 21 moved axially.When the male cone (strobilus masculinus) of its inner conical surface and two 3rd gears 8 rubs mutually, baulk ring 21 drives lock pin 4 and rotates an angle, at this moment synchronous tooth overlaps the conical surface in another uniform on 5 disc group hole and the annular groove conical surface of lock pin offsets, tooth cover 5 stops to move synchronously, but still driver's applied force continuous action is arranged on it, friction force between two conical surfaces has overcome after the speed discrepancy of two adjacent gears, tooth overlaps 5 just relative baulk ring 21 and angles of lock pin 4 backward rotation synchronously, tooth cover 5 just can be crossed the locking face on the lock pin 4 smoothly and continue reach synchronously, at this moment, synchronously tooth cover 5 equates with two 3rd gear 8 rotating speeds, when thereby the male splines of tooth cover 5 is meshed with the female splines of two 3rd gears 8 synchronously, there is not speed discrepancy, can realize not having the engagement of impact, make shift control light, the annular groove of locating dowel pin 26 promptly skidded off synchronous tooth and overlapped hole on 5 disc this moment.So far, whole engage a gear process is finished smoothly.Like this, power is after driving engine, power-transfer clutch are imported by one 1, pass on the shaft gear 2 by spline, pass to two tween drive shaft transmission gears 25 in a symmetrical arrangement again, pass to two 3rd gears 9 by the third-speed gear of intermediate shaft 23 of two symmetric arrangement again, pass to 5, two 27 in synchronous tooth cover by spline engagement, thereafter, power passed to pays a case driven wheel 16 and enter and pay a case, final by pay case from the gearbox output flange takeoff output.

Two tween drive shaft structures make with two tween drive shafts that are meshed that cog on gear all be arranged in two 27 both sides in pairs, symmetrically, the moment of torsion that gear is transmitted reduces by half, thereby the facewidth is narrower, and the change-speed box axial dimension is less, the layout of convenient automotive transmission.

The utility model is simple in structure, compact, control comfort, use reliable, be easy to processing and manufacturing, and installation and maintenance are convenient, and cost is low, and can satisfy engine power is the requirement of various autotrucies, motorcoach and the speciality car of 191～228KW.

Claims (4)

1, a kind of pair of tween drive shaft Automotive transmission is characterized in that: it is connected with synchro on two of the main tanks of former pair of tween drive shaft Automotive transmission; Two and the gear that is connected on two float.

2, a kind of pair of tween drive shaft Automotive transmission according to claim 1 is characterized in that: described synchro can be the lockpin-type inertia synchronizer that cone of friction is arranged, and its two baulk rings are linked together by six screws by three lock pins.

3, a kind of pair of tween drive shaft Automotive transmission according to claim 1 is characterized in that: described two last each D Drive gears and a shaft gear all have the synchronous conical surface.

4, a kind of pair of tween drive shaft Automotive transmission according to claim 1, it is characterized in that: the synchronous tooth of described synchro is with female splines and male splines.