CN2727503Y

CN2727503Y - First gear and reverse gear enhanced transmission for medium-duty vehicle

Info

Publication number: CN2727503Y
Application number: CN 200420034096
Authority: CN
Inventors: 孔冬泉; 谢德全; 向信中; 朱明斌
Original assignee: Chongqing Dajiang Industry (Group) Co Ltd
Current assignee: Chongqing Dajiang Industry Co Ltd
Priority date: 2004-06-17
Filing date: 2004-06-17
Publication date: 2005-09-21
Anticipated expiration: 2014-06-17

Abstract

The utility model relates to a first gear and reverse gear enhanced transmission for medium-size vehicle, which mainly comprises a box body, a first shaft, a second shaft, gear wheels of each gear on the second shaft, a synchronizer, a counter shaft and gear wheels of each gear on the counter shaft, a reverse gear and a shifting mechanism assembly. The shifting mechanism of the first gear and the reverse gear adopts a shifting mode by using a sliding gear sleeve. A second shaft reverse gear, a gear holder and a sliding gear sleeve are additionally arranged on the second shaft. The sliding gear sleeve can slide from left to right driven by a shift fork. The sliding gear sleeve is respectively combined with the external spline of the gear wheel of the first gear of the second shaft or the external spline of the gear wheel of the reverse gear of the second shaft. The function of transmission or backing at the first gear speed ratio can be realized, while the gear wheels of the first gear and the reverse gear of the second shaft are meshed with each other all the time, and not participate in the movement of shift without attacking the gear wheels, and thereby the defect that the first gear and the reverse gear of the YC140 type vehicle speed transmission are easy to be disengaged and damaged is overcome. The shift journey of the first gear and the reverse gear is shortened. Therefore the first gear and reverse gear enhanced transmission for medium-duty vehicle is conveniently suitable for controlling the shift by the remote anchor line, which enhances the function.

Description

One grade, the reinforced compact car speed changer of reverse gear

Technical field

The utility model belongs to the automotive transmission technology, is specifically related to a kind ofly carry out improved one grade, the reinforced compact car speed changer of reverse gear at one grade of YC140 type automotive transmission, reverse gear.

Background technique

Former YC140 type automotive transmission has been obtained very big success since introducing to the market, captured a part of market share of compact car transmission market.But in actual use, also there is certain defective, referring to Fig. 3, among the figure 30 be shifting slide gear, 11 be two, 12 for jack shaft, 13 for reverse gear, it shows that mainly one grade, reverse gear are gear slippage gear shift, easily beats tooth during gear shift, when gear when incomplete, easily out of supply or cause gear capacity to descend, gear is damaged.Because have this problem, the three guarantees after sales service pressure of YC140 type automotive transmission is very big, but market has very big demand again to this type speed changer.Secondly, this gearshift mechanism of YC140 type automotive transmission causes a retaining, reverse gear gear shift stroke long, can not realize the remote control gear shift, can only manipulate gear shift directly with gear lever.

Summary of the invention

The purpose of this utility model is the problems referred to above that exist at existing YC140 type automotive transmission, provide a kind of one grade, the reinforced compact car speed changer of reverse gear, by to one grade in the YC140 type automotive transmission, reverse gear slippage gearshift mechanism improves, under the situation that does not change YC140 type automotive transmission overall structure and external dimension, one grade, slippage tooth cover gearshift mechanism is changed in the reverse gear gear shift, make gear shift tooth not occur beating, out of supply, guarantee that gear has enough bearing capacitys, gear is not fragile, make one grade, the reverse gear gearshift mechanism is strengthened, and makes that gear shift is more convenient to be controlled.

The purpose of this utility model realizes by following scheme:

One grade, the reinforced compact car speed changer of reverse gear mainly include casing, one, two and two and go up each grade gear, synchronizer, each grade gear, reverse gear, gearshift mechanism assembly on jack shaft and the jack shaft; Wherein, two and jack shaft all are loaded in the casing by the bearing supporting, one then by single bearing supporting extension arms outside casing; Two one grade of gears are loaded on two by needle bearing, and it and jack shaft are normal engagement.They and common compact car speed changer structure are roughly the same, under the identical situation of input speed by synchronizer or sliding gear collar respectively with two on each grade gear combine, obtain different reduction speed ratio, thereby make two output speeds, moment of torsion generation respective change, to satisfy the requirement of vehicle under different operating modes.

The improvement of this speed changer is characterised in that one grade, reverse gear gearshift mechanism have adopted the sliding gear collar gearshift mechanism, specifically be on two, two reverse gears to be installed by needle bearing, and between two reverse gears and two one grade of gears, toothholder is installed, this toothholder is fixed on two and goes up and pass through the empty cover of external splines one sliding gear collar, and sliding gear collar is connected by reverse shift fork and drives; Two one grade of gears and two reverse gears of sliding gear collar both sides are all having the external splines that combines with sliding gear collar respectively near sliding gear collar one end; sliding gear collar can horizontally slip under reverse shift fork drives like this; combine with above-mentioned two geared end external spliness respectively; just can be implemented in one grade of speed ratio underdrive or car-backing function; two one grade and two pairs of gears of reverse gear then are in normal engagement all the time; no longer participate in the gear shift action, the protection gear is avoided impacting.This and common compact car speed changer by one one grade, the slippage of the reverse gear left and right sides respectively with countershaft-gear and reverse gear engagement, realize that above-mentioned functions has significant difference.

The employing said structure is following advantage for this speed changer brings: at first overcome the defective that YC140 type automotive transmission one keeps off, reverse gear is easily out of supply and damage, make gear shift tooth, out of supply not occur beating, guarantee that gear has enough bearing capacitys, gear is not fragile, and structure is strengthened; Secondly a retaining, reverse gear gear shift stroke shorten, and can be suitable for long-range backguy easily and handle gear shift.This speed changer is on the basis of original YC140 type automotive transmission, and except that relating to one grade, the part of reverse gear gear shift part, the remaining parts of speed changer and YC140 type automotive transmission are general, and cost increases seldom.

Description of drawings

Fig. 1 is an overall structure schematic representation of the present utility model;

Fig. 2 is the partial detailed structural representation that the utility model relates to improvement part;

Fig. 3 is existing YC140 type automotive transmission partial schematic diagram

Embodiment

Referring to Fig. 1: the critical piece of this speed changer has: one 1, two 11,3,4,6,7,10, four five grades of four, three, two, one grades of gears on jack shaft 12 and two and reverse gears are synchronously

Device 2, two third gear synchronizers 5, sliding gear collar 9, toothholder 23, two on the jack shaft, three, fourth gear and constant mesh gear 14,15,16,17, reverse gear 13, casing 18, gearshift mechanism assembly 8 etc.Two 11, jack shaft 12 all are loaded in the casing 18 by the bearing supporting, one 1 by single bearing supporting extension arms outside casing 18, go up each grade gear 3,4,6,7 by needle bearing and two 11 assemblings for two, the tooth cover of four Five-gear synchronizers 2, two third gear synchronizers 5 is placed on two 11 splines, each grade gear 14,15,16,17 is connected with jack shaft 12 by woodruff key on the jack shaft 12, and these are all basic identical with the YC140 speed changer structure.

This transmissions improved is partly referring to Fig. 2: newly-increased two reverse gears 10 are by needle bearing 26, axle sleeve 22 is installed on two 11, between it and two one grade of gears 7, establish toothholder 23 and sliding gear collar 9, toothholder 23 connects with two 11 by internal spline, sliding gear collar 9 is placed on the toothholder external splines, sliding gear collar 9 horizontally slips under the drive of sliding selector shaft 27 and reverse shift fork 28, external splines 29 with two first gears or two reverse gears combines respectively, driving two 11 by sliding gear collar 9 rotates together, when sliding gear collar 9 does not combine with the external splines 29 of said gear, two one grade of gears, two then idle running on two 11 of reverse gear.Spacer 19, two rear bearings 20 of reverse gear throw-out collar, thrust ring 21, two one grade of gear thrust collars 24, thrust snap ring 25 etc. then play limiting gear or the axially movable effect of needle bearing in addition.

Claims

1, one grade, the reinforced compact car speed changer of reverse gear include casing, and one, two and two each grade gear and synchronizers of going up assembling, each grade gear that assembles on jack shaft and the jack shaft, reverse gear and gearshift mechanism assembly; Wherein, two and jack shaft all are loaded in the casing by the bearing supporting, one then by single bearing supporting extension arms outside casing; Two one grade of gears are loaded on two by needle bearing, and it and jack shaft are normal engagement; It is characterized in that: slippage tooth cover gearshift mechanism is adopted in the gear shift between a grade of speed changer and the reverse gear, this structure is by needle bearing two reverse gears to be installed on two, and between two reverse gears and two one grade of gears, toothholder is installed, this toothholder is fixed on two and goes up and pass through the empty cover of its external splines one sliding gear collar, and sliding gear collar is connected by reverse shift fork and drives; Two one grade of gears of sliding gear collar both sides and two reverse gears combine with their external splines respectively when sliding gear collar horizontally slips near sliding gear collar one end the external splines that combines with sliding gear collar being arranged all respectively; These two reverse gears and reverse gear are normal engagement.