CN201687924U

CN201687924U - Automatic centering device of tractor shift lever

Info

Publication number: CN201687924U
Application number: CN2010202095874U
Authority: CN
Inventors: 郭华; 修永海; 杨明; 张裕慧
Original assignee: CHANGFA INDUSTRIAL GROUP Co Ltd JIANGSU PROV
Current assignee: Jiangsu Changfa Agricultural Equipment Co Ltd
Priority date: 2010-05-28
Filing date: 2010-05-28
Publication date: 2010-12-29
Anticipated expiration: 2020-05-28

Abstract

The utility model discloses an automatic centering device of a tractor shift lever, which comprises an upper cover, the shift lever and a toggling fork shaft arranged inside the upper cover. A swayable gear shifting ball head is connected to the shift lever and extends into the upper cover to be connected with the toggling fork shaft by the aid of a gear selecting rocker arm, supporting rib plates are arranged inside the upper cover, the toggling fork shaft movably penetrates through the supporting rib plates, a gear shifting toggling head is fixed onto the toggling fork shaft positioned between the two supporting rib plates, return springs sleeved on the toggling fork shaft and at two ends of the gear shifting toggling head are arranged among the gear shifting toggling head and the supporting rib plates in a fastening manner, a peripheral concave ring groove is arranged on the toggling fork shaft, and a positioning steel ball arranged inside the concave ring groove in a fastening manner is capable of limiting movement of the toggling fork shaft. The automatic centering device of a tractor shift lever solves the problems of difficult accurate finding of the position of a neutral gear and poor operation feeling when a current shift lever is operated and leads the tractor shift lever to rapidly return to the position of the neutral gear in the middle in operation.

Description

Automatically time middle device of tractor gear level

Technical field

The utility model relates to tractor manufacturing technology field, especially a kind of time middle device automatically of tractor gear level.

Background technique

The gear level of tractor shifting mechanism has five or six a plurality of gears usually, and have a left side in a lateral direction, in, right three drive ranges, realize the adjusting of gearbox different rotating speeds by the conversion of gear level diverse location, when gear level during from the neutral position of left and right sides gear in the middle of returning, the at present general method that adopts is that the gearshift shifting block both sides on declutch shift shaft are provided with returning spring and realize, guarantee that position centering is accurate, then require the mounting distance of gearshift shifting block both sides returning spring identical, because the gearshift housing inner chamber bi-side of spacing returning spring are cast blank, do not pass through machining, therefore the mounting distance of both sides all is unequal, there is certain error, also can only be in 3mm by the general controllable error of existing casting ability, cause the gearshift shifting block about differ under the effect of two returning springs neutral position in the middle of getting back to fully surely, and will housing inner chamber bi-side be processed, both time-consuming, difficulty of processing is also big; The method that also has is to adopt three gears in the corresponding left, center, right of three locating slots are set on declutch shift shaft, embed each locating slot by locking ball again and carry out gear shift operation, but this mode in use, and operator's operating handle is relatively poor, fully can only be with the sensation operation.

The model utility content

The technical problems to be solved in the utility model is: overcome the deficiency in the prior art, a kind of time middle device automatically of tractor gear level is provided, make gear level when operation, can get back to middle neutral position fast, solve the gear level that exists at present and when operation, be difficult to find accurately neutral position, the problem that operation sense is relatively poor.

The technological scheme that its technical problem that solves the utility model adopts is: a kind of time middle device automatically of tractor gear level, comprise upper cover body, gear level and be arranged on declutch shift shaft in the upper cover body, gear level is connected with the gearshift bulb that can swing, the gearshift bulb puts in the upper cover body and by shift selecting rocking arm and is connected with declutch shift shaft, has bearing rib in the upper cover body, declutch shift shaft is used to pass bearing rib movably, on the declutch shift shaft between two bearing ribs, be fixed with the gearshift shifting block, be set with returning spring on the declutch shift shaft at described gearshift shifting block two ends, returning spring is fastened between gearshift shifting block and the bearing rib, declutch shift shaft is provided with circumferential spill annular groove, is arranged with in the spill annular groove and can limits the locking ball that declutch shift shaft moves.

For realizing that locking ball snaps in the spill annular groove on the declutch shift shaft, offer adjustment hole on the described bearing rib perpendicular to declutch shift shaft, locking ball is positioned at adjustment hole, also be provided with in the adjustment hole locking ball is pressed in retaining spring in the spill annular groove, the nose end of adjustment hole is connected with the adjusting screw of can regulate retaining spring impacting force.

The beneficial effects of the utility model are: the utility model adopts returning spring and locking ball way of combining, make gear level in operating process, can get back to middle neutral position quickly and accurately, and need not to require the equidistant setting of gearshift shifting block both sides returning spring, simplified manufacturing procedure, and when gearshift operating handle better.

Description of drawings

Below in conjunction with drawings and embodiments the utility model is further specified.

Fig. 1 is a structural representation of the present utility model.

Fig. 2 is the A-A sectional structure schematic representation among Fig. 1.

1. upper cover body 1-1. bearing rib 1-1.1 adjustment holes, 2. gear levels, 3. declutch shift shaft 3-1. spill annular grooves, 4. gearshift bulbs, 5. shift selecting rocking arms, 6. gearshift shifting blocks, 7. returning springs, 8. locking balls, 9. retaining springs, 10. adjusting screw, 11. spacers among the figure

Embodiment.

In conjunction with the accompanying drawings the utility model is further described now.The schematic representation that these accompanying drawings are simplification only illustrates basic structure of the present utility model in a schematic way, so it only shows the formation relevant with the utility model.

Time middle device automatically as Fig. 1 a kind of tractor gear level shown in Figure 2, what show is the state that gear level 2 is in the neutral gear neutral position, has the upper cover body 1 that can be connected with the gear box of tractor casing, be provided with declutch shift shaft 3 in the upper cover body 1, gearshift bulb 4 relies on the last plane positioning setting of upper cover body 1 and can all around swing, realize the adjustment of gearbox gear, one end of gearshift bulb 4 connects for driver-operated gear level 2, the other end puts in the upper cover body 1 and by shift selecting rocking arm 5 and is connected with the left part of declutch shift shaft 3, the inner chamber of upper cover body 1 is provided with bearing rib 1-1, declutch shift shaft 3 is used to pass bearing rib 1-1 movably, on the declutch shift shaft 3 between two bearing rib 1-1, be fixed with and be used to stir the gearshift shifting block 6 that shifting slide gear slides in the gearbox, on the declutch shift shaft 3 at gearshift shifting block 6 two ends, be set with returning spring 7, returning spring 7 is fastened between gearshift shifting block 6 and the bearing rib 1-1, and also be provided with a spacer 11 between an end of the shifting block 6 of wherein shifting gears and the returning spring 7, words if necessary, can be by processing adjustment to spacer 11 width, regulate the extended length of two returning springs 7, reach the balance of two returning spring 7 elastic force, has a spill annular groove 3-1 who circumferentially offers on the right part of declutch shift shaft 3, when this spill annular groove 3-1 is positioned at middle neutral position at gear level 2, just in time be in the neutral position of bearing rib 1-1, offer an adjustment hole 1-1.1 on the bearing rib 1-1 perpendicular to declutch shift shaft 3, be provided with a locking ball 8 in the adjustment hole 1-1.1, adjustment hole 1-1.1 end has screw thread, also be provided with a retaining spring 9 that locking ball 8 can be pressed in the spill annular groove 3-1 in the adjustment hole 1-1.1, adjustment hole 1-1.1 end thread is connected with an adjusting screw 10, the adjusting of the screw-in amount size by adjusting screw 10, regulate retaining spring 9 and press to the impacting force of locking ball 8, thus the size of the required power of stirring when adjusting gear level about 2 and stirring.

The utility model is by being provided with the mode of a spill annular groove 3-1 on declutch shift shaft 3; pilot control gear level 2 from left gear or right gear to the time in the middle of neutral position when stirring; gearshift shifting block 6 drives declutch shift shaft 3 near middle neutral position; this moment, locking ball 8 can snap under the effect of retaining spring 9 pressure in the spill annular groove 3-1; thereby moving of restriction declutch shift shaft 3; by declutch shift shaft 3 and shift selecting rocking arm 5; interconnect function between gearshift bulb 4 and the gear level 2; make gear level 2 neutral position that just in time mediates; the ingenious part of this structure is owing to adopt locking ball 8 to limit the mobile position of declutch shift shaft 3; make the returning spring 7 of gearshift shifting block 6 both sides need not the length unanimity; so the side that bearing rib 1-1 contacts with returning spring 7 also just needn't be processed spray; reduced amount of finish; therefore the utility model is when a gear level 2 control a plurality of gears (5 or 6) and three drive ranges of horizontal direction existence; can guarantee gear level 2 from left and right sides gear accurately and apace return in the middle of neutral position; and it is easy to operate; control easily; operating handle is also better, has changed in the past with the sensation operation; the situation that is difficult for control.

Above-mentioned mode of execution only is explanation technical conceive of the present utility model and characteristics; its purpose is to allow the personage that is familiar with this technology can understand content of the present utility model and is implemented; can not limit protection domain of the present utility model with this; all equivalences of being done according to the utility model spirit change or modify, and all should be encompassed in the protection domain of the present utility model.

Claims

1. install in automatic the returning of a tractor gear level, comprise upper cover body (1), gear level (2) and be arranged on declutch shift shaft (3) in the upper cover body (1), gear level (2) is connected with the gearshift bulb (4) that can swing, gearshift bulb (4) puts in the upper cover body (1) and by shift selecting rocking arm (5) and is connected with declutch shift shaft (3), has bearing rib (1-1) in the upper cover body (1), declutch shift shaft (3) is used to pass bearing rib (1-1) movably, be positioned at and be fixed with gearshift shifting block (6) on the declutch shift shaft (3) between two bearing ribs (1-1), it is characterized in that: be set with returning spring (7) on the declutch shift shaft (3) at described gearshift shifting block (6) two ends, returning spring (7) is fastened between gearshift shifting block (6) and the bearing rib (1-1), declutch shift shaft (3) is provided with circumferential spill annular groove (3-1), is arranged with in the spill annular groove (3-1) to limit the locking ball (8) that declutch shift shaft (3) moves.

2. time middle device automatically of tractor gear level according to claim 1, it is characterized in that: offer adjustment hole (1-1.1) on the described bearing rib (1-1) perpendicular to declutch shift shaft (3), locking ball (8) is positioned at adjustment hole (1-1.1), also be provided with in the adjustment hole (1-1.1) locking ball (8) is pressed in the interior retaining spring (9) of spill annular groove (3-1), the nose end of adjustment hole (1-1.1) is connected with the adjusting screw (10) of can regulate retaining spring (9) impacting force.