CN201368194Y

CN201368194Y - Reversing mechanism used for transmission overdrive

Info

Publication number: CN201368194Y
Application number: CNU2009200321100U
Authority: CN
Inventors: 许亮; 李大开; 王顺利; 杨林
Original assignee: Shaanxi Fast Gear Co Ltd
Current assignee: Shaanxi Fast Gear Co Ltd
Priority date: 2009-03-05
Filing date: 2009-03-05
Publication date: 2009-12-23
Anticipated expiration: 2019-03-05

Abstract

The utility model relates to a reversing mechanism used for a transmission overdrive. The reversing mechanism aims at a gearbox body without an upper cover and comprises a support guide block, a sway shifting block, an overdrive reversing guide block and an overdrive fork, wherein the overdrive fork is sheathed on a first fork shaft, the support guide block is sheathed on a second fork shaft, the support guide block is connected with a gearbox housing through a positioning device, the overdrive reversing guide block is fixed on the overdrive fork shaft, the middle of the sway shifting block is articulated on the support guide block, one end of the sway shifting block is inserted into a fork pocket of the overdrive fork and the other end thereof is inserted into the fork pocket of the overdrive reversing guide block. When engaging the overdrive, the overdrive fork shaft drives the overdrive reversing guide block to move and then drives the overdrive fork to reversely slide along the first fork shaft through the sway shifting block, thus realizing the purpose of engaging the overdrive.

Description

The changement that is used for the speed changer overgear

Technical field

The utility model relates to the speed changer field, particularly a kind of changement that is used for the speed changer overgear.

Background technique

If in automotive transmission, be provided with the overgear,, the changement of overdirve gear just need be set in order to satisfy driver's the operating habit of putting into gear.Because traditional automotive transmission has loam cake, overgear changement and support thereof can be arranged on the speed changer and cover.But for the mission case of having cancelled traditional loam cake (for example segmented mission case of the applicant's design), owing to lost the loam cake support, the design of its changement has just become a key issue during band overgear.

Summary of the invention

Problem to be solved in the utility model provides a kind of changement that is used for the speed changer overgear at no loam cake mission case.

The technological scheme that the utility model addresses the above problem is: the changement that is used for the speed changer overgear that is provided comprises the support guide block, the swing shifting block, overgear commutation guide block and overgear shift fork, wherein the overgear shift fork is sleeved on first declutch shift shaft, supporting guide block is sleeved on second declutch shift shaft, this supports guide block and is connected with gear box casing by positioning device again, overgear commutation guide block is fixed on the declutch shift shaft of overgear, the middle part of swing shifting block is hinged on to be supported on the guide block, one end of swing shifting block inserts in the fork pockets of overgear shift fork, and the other end of swing shifting block inserts in the fork pockets of overgear commutation guide block.The swing shifting block is equivalent to a lever that plays acting in opposition, and its two ends are connected with the overgear shift fork with overgear commutation guide block respectively, provide support for the swing shifting block and support guide block.When hanging the overgear, the driver only needs to move the overgear declutch shift shaft according to usual custom by operating mechanism, then driving overgear commutation guide block moves in the same way, moving of overgear commutation guide block drives the swing of swing shifting block again, because the swing shifting block has acting in opposition, thereby drive the overgear shift fork along the first declutch shift shaft reverse slide, realize putting into gear.

The optimum scheme of above-mentioned positioning device is: this positioning device has the location plug screw of axial bore by one and the bearing pin on the described support guide block is formed, wherein locating plug screw screws in from case of transmission, the bearing pin that supports on the guide block inserts in the axial bore of location plug screw, and the middle part of swing shifting block is enclosed within on the bearing pin that supports guide block.This mode of structure was both simple, was convenient to assembling again.

The utility model will be sleeved on second declutch shift shaft the support guide block as the swing shifting block support, and the overgear shift fork is sleeved on first declutch shift shaft, that is to say changement and pressing fork rack assembly are assembled together, compact structure not only, and assembling is good, use proof, the reliable performance of this structure has satisfied usage requirement fully.

Description of drawings

Fig. 1 is an embodiment's of the utility model a vertical profile structural drawing.

Fig. 2 is the declutch shift shaft embodiment illustrated in fig. 1 and the pressing fork rack assembly figure of changement composition.

Embodiment

Below in conjunction with embodiment content of the present utility model is described in detail.

As depicted in figs. 1 and 2: the mission case of present embodiment is the three stage structure of no loam cake, it is made up of preceding piece housing 1, middle piece housing 2 and back piece housing 3, preceding piece housing 1 is a clutch housing, middle piece housing 2 is the drive part housing, back piece housing 3 is a bonnet, connect with bolt between the three part housing, the pressing fork rack assembly 4 of this speed changer is supported on preceding piece housing 1 and the back piece housing 3.Speed changer has six forward gears and one and reverses gear, wherein five retainings are direct retainings, six retainings are overgears, the movement direction of its shift fork when five, shifting gears between six retainings (directly retaining and overgear shift fork) 5 keeps off with one or two, three or four retainings are compared is reverse, this does not meet driver's operating habit, therefore five or six retainings need be commutated.Changement is formed by supporting guide block 6, swing shifting block 7, location plug screw 8,56 retaining commutation guide blocks 9 and five or six retaining shift forks 5, wherein five or six retaining commutation guide blocks 9 are fixed on five or the six retaining declutch shift shafts (promptly directly keeping off and the overgear declutch shift shaft) 10, can move with declutch shift shaft 10; Five or six retaining shift forks 5 are sleeved on first declutch shift shaft 11 that is used for one or two retaining shift forks 13, and therefore five or six retaining shift forks 5 can be free to slide by relative first declutch shift shaft 11; Support guide block 6 and be sleeved on second declutch shift shaft 12 that is used for three or four retaining shift forks 14.Swing shifting block 7 is flat boards of a two ends band oval head, the borehole jack at its middle part is on the bearing pin 61 that supports guide block 6, can be around bearing pin 61 swings of supporting guide block, the oval head of swing shifting block 7 one ends inserts in the fork pockets 51 of five or six retaining shift forks, and the oval head of its other end inserts in the fork pockets 91 of five or six retaining commutation guide blocks.Swing shifting block 7 is equivalent to a fulcrum at the lever that plays acting in opposition that supports on the guide block bearing pin 61 this moment, if five or six retaining commutation guide blocks 9 move to left, then swings shifting block 7 and will drive five or six and keep off shift forks 5 and move to right.Plug screw 8 piece housing 2 from speed changer in location screws in, and the bearing pin 61 that supports guide block inserts in the axial bore of location plug screw 8, makes to support guide block 6 location.Among Fig. 1 other is numbered: 15---back fork, and 16---the back fork axle.

Referring to Fig. 2, when hanging the overgear, five or six retaining shift forks 5 need be hung to the right, this moment, the driver moved to left five or six retaining declutch shift shafts 10 by operating mechanism, and five or six retaining commutation guide blocks 9 move to left thereupon, and drove 7 swings of swing shifting block, move to right thereby drive five or six retaining shift forks 5, realize putting into gear of overgear.

The utility model also can be used for the speed changer with odd-side (front and back case).

Claims

1, the changement that is used for the speed changer overgear, it is characterized in that comprising support guide block (6), swing shifting block (7), overgear commutation guide block (9) and overgear shift fork (5), wherein overgear shift fork (5) is sleeved on first declutch shift shaft (11), supporting guide block (6) is sleeved on second declutch shift shaft (12), this supports guide block and is connected with gear box casing by positioning device again, overgear commutation guide block (9) is fixed on the overgear declutch shift shaft (10), the middle part of swing shifting block is hinged on to be supported on the guide block (6), one end of swing shifting block inserts in the fork pockets of overgear shift fork (5), and the other end of swing shifting block inserts in the fork pockets of overgear commutation guide block (9).

2, changement according to claim 1, it is characterized in that said positioning device has the location plug screw (8) of axial bore by one and the bearing pin (61) on the described support guide block (6) is formed, wherein locating plug screw screws in from case of transmission, the bearing pin that supports on the guide block inserts in the axial bore of location plug screw, and the middle part of swing shifting block (7) is enclosed within on the bearing pin (61) that supports guide block.