CN201090686Y

CN201090686Y - Large tractor transfer case

Info

Publication number: CN201090686Y
Application number: CNU2007201847222U
Authority: CN
Inventors: 何帮飞; 王伟忠; 周华水
Original assignee: ZHEJIANG CHANGTAI MACHINERY CO Ltd
Current assignee: ZHEJIANG CHANGTAI MACHINERY CO Ltd
Priority date: 2007-10-26
Filing date: 2007-10-26
Publication date: 2008-07-23
Anticipated expiration: 2017-10-26

Abstract

The utility model discloses a transfer case for a large tractor, belonging to the technical field of transport machinery. The utility model comprises a shell component and an input shaft; a reverse input gear, a low-gear input gear and a high-gear input gear are arranged on the input shaft; a rear axle output shaft is arranged on the shell component; a reverse output gear, a low-gear output gear and a high-gear output gear are arranged on the rear axle output shaft; the reverse output gear and the low-gear output gear are meshed respectively and correspondingly with the reverse input gear and the low-gear input gear arranged on the input shaft; an idler wheel is meshed with the reverse input gear on the input shaft and is simultaneously meshed with the reverse output gear on the rear axle output shaft; a front axle output shaft bearing is arranged on the shell component and a front axle output gear is nested on the front axle output shaft; the idler wheel is meshed with the high-gear output gear on the rear axle output shaft and is simultaneously meshed with the front axle output gear on the front axle output shaft. The large tractor transfer case has the advantages of compact structure, multiple gears, large speed ratio range and good meshing performance.

Description

The large tractor transfer case

Technical field

The utility model relates to a kind of large tractor transfer case, belongs to the Transport Machinery technical field.

Background technique

At present, domestic large tractor transfer case and gearbox are the combined integrate structure, be 4 * (3+1), i.e. 12 forward gears, 4 retainings that fall back, main transformer speed adopts normal engagement helical gear, the synchronizer gearshift, secondary speed change is normal engagement straight toothed spur gear, the gearshift of engagement cover, and transfer case separates engaging mechanism for the straight toothed spur gear band.The shortcoming of this transfer case is that gear is few, can not fully satisfy the large tractor job requirements, and maintenance is also inconvenient, can not satisfy the fast-developing needs of agriculture industrialization.

The model utility content

The purpose of this utility model is exactly in order to overcome the deficiency of above-mentioned existence, and a kind of compact structure is provided, gear is many, ratio coverage is big, meshing performance is good, can satisfy the large tractor transfer case that is complementary with 120～210 horsepower engines.

The technological scheme that the utility model is taked is, a kind of large tractor transfer case, the utility model comprises frame set 3, input shaft 1 is bearing on the frame set 3 by roller bearing 2, reverse gear input gear 16, low-grade input gear 17, high-grade input gear 18 all by needle bearing respectively sky be enclosed within on the input shaft 1; Between reverse gear input gear 16, low-grade input gear 17, the high-grade input gear 18 collar shift mechanism is housed respectively, high and low shift gear shift toothholder 20 is fixed on the input shaft 1 by spline and is integral with input shaft 1, back axle output shaft 4 is bearing on the frame set 3 by roller bearing 5, reverse gear output gear 13, low-grade output gear 14, high-grade output gear 15 are installed on the back axle output shaft 4 by hot jacket, reverse gear output gear 13, low-grade output gear 14 respectively with input shaft 1 on reverse gear input gear 16, the 17 corresponding engagements of low-grade input gear; Reverse idler gear axle 11 directly is bearing on the frame set 3, and idle pulley 12 is enclosed within on the idler shaft 11 by the needle bearing sky, idle pulley 12 with input shaft 1 in 16 engagements of reverse gear input gear, be meshed with reverse gear output gear 13 on the back axle output shaft 4; Propons output shaft 8 is bearing on the frame set 3 by tapered roller bearing 9, propons output gear 10 is enclosed within on the propons output shaft 8 by the needle bearing sky, propons idler shaft 7 directly is bearing on the frame set 3, idle pulley 6 is enclosed within on the idler shaft 7 by the needle bearing sky, idle pulley 6 with back axle output shaft 4 on high-grade output gear 15 engagement in, be meshed with propons output gear 10 on the propons output shaft 8.

The utility model adopts high and low shelves on the input shaft, the empty cover of reverse gear, and the high and low shift toothholder is fixed on the input shaft with spline, and reverse gear toothholder and input shaft are designed to integral body; Simultaneously, increase by an idle pulley, realize car-backing function at outlet side.Output shaft cogs hot jacket on axle, be meshed with gear, idle pulley on the input shaft respectively, under the effect of collar shift mechanism, transfer case high and low shift, reverse gear, front and back bridge output transmission system, the utility model forms 7 * (2+1) owing to be independent assembly with seven speed transmissions, 14 forward gears, 7 retainings that fall back, and all adopt the helical gear engagement driving have compact structure, gear is many, ratio coverage is big, meshing performance is good advantage.

Description of drawings

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

Fig. 2 is the A-A sectional view of Fig. 1;

Fig. 3 is a drive mechanism schematic representation of the present utility model.

Embodiment

With reference to Fig. 1, Fig. 2, shown in Figure 3, the utility model comprises frame set 3, input shaft 1 is bearing on the frame set 3 by roller bearing 2, reverse gear input gear 16, low-grade input gear 17, high-grade input gear 18 all by needle bearing respectively sky be enclosed within on the input shaft 1; Between reverse gear input gear 16, low-grade input gear 17, the high-grade input gear 18 collar shift mechanism is housed respectively, high and low shift gear shift toothholder 20 is fixed on the input shaft 1 by spline and is integral with input shaft 1, back axle output shaft 4 is bearing on the frame set 3 by roller bearing 5, reverse gear output gear 13, low-grade output gear 14, high-grade output gear 15 are installed on the back axle output shaft 4 by hot jacket, reverse gear output gear 13, low-grade output gear 14 respectively with input shaft 1 on reverse gear input gear 16, the 17 corresponding engagements of low-grade input gear; Reverse idler gear axle 11 directly is bearing on the frame set 3, and idle pulley 12 is enclosed within on the idler shaft 11 by the needle bearing sky, idle pulley 12 with input shaft 1 in 16 engagements of reverse gear input gear, be meshed with reverse gear output gear 13 on the back axle output shaft 4; Propons output shaft 8 is bearing on the frame set 3 by tapered roller bearing 9, propons output gear 10 is enclosed within on the propons output shaft 8 by the needle bearing sky, propons idler shaft 7 directly is bearing on the frame set 3, idle pulley 6 is enclosed within on the idler shaft 7 by the needle bearing sky, idle pulley 6 with back axle output shaft 4 on high-grade output gear 15 engagement in, be meshed with propons output gear 10 on the propons output shaft 8.

Working principle of the present utility model is as follows: under the choosing of top cover assembly 23, shift lever effect, shift fork system in the last cap assembly 22 begins to move forward and backward, the tooth cover that drives in the collar shift mechanism between high and low shift or the reverse gear moves forward and backward, boring upper spline synchronously with a certain shelves combines, the free gear and the input shaft 1 of a certain gear on the input shaft 1 are combined into one, realize the power output of this gear.(example: when the reach of reverse gear tooth cover engaged with the reverse-gear upper spline, power was imported gear 16 through input shaft 1 to reverse gear, to reverse idler gear 12, to reverse gear output gear 13, to back axle output shaft 4, after bead is exported to transmission shaft.)

During propons output, tooth cover 24 is under the effect of operating mechanism, and reach combines with propons output gear 10, and propons output gear 10 and propons output shaft 8 are combined into one, and realizes power output.

The utility model relates to the transmission of five nine gear secondarys, all adopts the helical gear transmission, realizes high and low shelves, reverse gear, forward and backward bridge power output combination.Wherein, high and low shelves, each 1 of reverse gear.Propons 2 forward gearss, back axle 2 forward gearss, 1 reverse gear; Speed ratio: I _{Preceding 1}=0.737, I _{Preceding 2.}=1.324, I _{Back 1}=0.895, I _{Back 2}=1.607 (1.880), I _R=1.615.All adopt collar shift.

Claims

1. large tractor transfer case, comprise frame set (3), be bearing in the input shaft (1) on the frame set (3), it is characterized in that: reverse gear input gear (16), low-grade input gear (17), high-grade input gear (18) sky respectively are enclosed within on the input shaft (1), and high and low shift gear shift toothholder (20) is fixed on that input shaft (1) is gone up and input shaft (1) is integral; Back axle output shaft (4) is bearing on the frame set (3), reverse gear output gear (13), low-grade output gear (14), high-grade output gear (15) are installed on the back axle output shaft (4), reverse gear output gear (13), low-grade output gear (14) respectively with input shaft (1) on reverse gear input gear (16), the corresponding engagement of low-grade input gear (17); Reverse idler gear (12) is bearing on the frame set (3) by reverse idler gear axle (11), reverse idler gear (12) on one side and input shaft (1) go up reverse gear input gear (16) engagement, another side is meshed with reverse gear output gear (13) on the back axle output shaft (4); Propons output shaft (8) is bearing on the frame set (3), and propons output gear (10) sky is enclosed within on the propons output shaft (8); Propons idle pulley (6) is bearing on the frame set (3) by propons idler shaft (7), propons idle pulley (6) on one side with back axle output shaft (4) on high-grade output gear (15) engagement, another side is meshed with propons output gear (10) on the propons output shaft (8).

2. large tractor transfer case according to claim 1 is characterized in that: described gear engagement is all the helical gear engagement driving.