CN202203382U - Gear shifting mechanism of mechanical gearbox - Google Patents

Abstract

The utility model relates to a gear shifting mechanism of a mechanical gearbox. The gear shifting mechanism is characterized in that: a first reverse gear stirring fork and a first reverse gear guide block are assembled on a gear shifting fork shaft by elastic cylindrical pins; the first reverse gear stirring fork belongs to a fixed stirring fork; a second-third gear stirring force and a fourth-fifth gear stirring fork can slide on the gear shifting fork shaft through fork shaft holes; a fourth-fifth gear reversing guide block and a fourth-fifth gear speed changing guide block are assembled on a reversing fork shaft by elastic cylindrical pins; the elastic cylindrical pin is arranged on the fourth-fifth gear speed changing guide block, and the exposed part of the pin passes through a slotted round hole on an embedded lump of the second-third gear stirring fork to slide in the slotted round hole; a reversing arm bracket assembly is fixed on the inner side of a shell; a reversing arm is clamped on the bracket assembly by an open check ring, and rotates about a reversing shaft of the bracket assembly; shifting blocks at the two ends of the reversing arm are positioned in stirring openings on the fourth-fifth gear reversing guide block and the fourth-fifth gear stirring fork respectively; and a speed changing embedded lump is embedded on the second-third gear stirring fork. A structure comprising two fork shafts and three stirring forks is adopted for the arrangement of the stirring forks, so that the weight of the assembly is reduced, material and machining cost is decreased, convenience is brought to assembly and maintenance, the structure is simplified, and the reliability of the gear shifting mechanism is improved.

Description

A kind of mechanical transmission gearshift

Technical field

The utility model relates to a kind of mechanical transmission gearshift, belongs to the technical field of transmission design.

Background technique

At present; The gearshift of mechanical transmission adopts following form usually: with the five-gear manual transmission is example, on the arrangement of shift fork, adopts 3 fork shafts, 3 shift fork structures usually; Each keeps off shift fork respectively through circular cylinder elastic cotter and the fixing assembling of fork shaft; Stir guide block through the gearshift shifting block, move, and then realize putting into gear and plucking retaining thereby drive shift fork.Generally 3 fork shaft levels are arranged in juxtaposition; Consider the restrictive condition on the space; The fork shaft in the middle of being positioned at and the vertical distance of transmission main shaft are difficult to further dwindle; Thereby the position that causes the both sides fork shaft so just is unfavorable for the reduction of transmission assembly height also than higher, and then influences the lightweight of assembly.Simultaneously, the structure of 3 fork shafts also is unfavorable for reducing cost of material and processing cost.On the self-locking mode, most self-locking steel ball and springs of adopting are assemblied in mode such in the hole of housing or loam cake through plug screw, and this structure receives the restriction of speed changer structure sometimes and can't realize, and are not easy to assembling and maintenance.On interlock mode; The work in coordination structure of locking of the interlocking groove that at present commonly used is on interlocking steel ball, interlocking plunger and the fork shaft, the amount of parts that this mode is used is more, and structure is complicacy relatively; And reliability is not high, and the wearing and tearing of exchange block sense and shift fork are all influential.

Summary of the invention

The purpose of the utility model is to provide a kind of mechanical transmission gearshift, and it adopts the structure of 2 fork shafts, 3 shift forks on the arrangement of shift fork, helps assembly to fall heavily, reduces material and processing cost.On the self-locking mode, adopt the self-locking spring assembly of integrated form to carry out self-locking; On interlock mode, adopt single interlocking block to realize interlocking; Be convenient to assembling and maintenance, make structure obtain simplifying, improved the reliability of gearshift.

The technological scheme of the utility model is achieved in that a kind of mechanical transmission gearshift, by one, back fork, and gear shift fork shaft, two, three retaining shift forks; One, the guide block that reverses gear, the elastic cylindrical pin that 30mm is long, four, five retaining shift forks, communtation arm; The communtation arm bracket assembly, split washer, four, five retaining switching-over guide blocks, interlocking block; Four, five retaining speed change guide blocks, the switching-over fork shaft, the self-locking spring assembly, the long elastic cylindrical pin of elastic cylindrical pin that 35mm is long and 25mm is formed; It is characterized in that: on the gear shift fork shaft respectively through elastic cylindrical pin assembling one, back fork and, the guide block that reverses gear, one, back fork belongs to fixedly shift fork; Two, three retaining shift forks and four, five retaining shift forks can slide on gear shift fork shaft through the fork shaft hole; Four, five retaining switching-over guide blocks and four, five retaining speed change guide blocks are assemblied on the switching-over fork shaft through elastic cylindrical pin; On four, five retaining speed change guide blocks, elastic cylindrical pin is installed; The part that pin exposes is passed in the slotted hole of two, three retaining shift forks on inserting and slides, and the communtation arm bracket assembly is fixed on the inboard of housing, and communtation arm is stuck on the bracket assembly by split washer; Around its reversing shaft rotation, the shifting block at communtation arm two ends lays respectively at dialling in the mouth on four, five retaining switching-over guide blocks and four, the five retaining shift forks; On two, three retaining shift forks, being inlaid with speed change inserts; The mouth of dialling on mouth and, the guide block that reverses gear of dialling on mouth and four, the five retaining speed change guide blocks of dialling on inserting is arranged side by side; The mouth of dialling arranged side by side was worn in interlocking on the interlocking block; The self-locking spring assembly is fixed on the housing, and the steel ball at top is positioned at corresponding self-locking groove.

The good effect of the utility model is that 2 fork shafts, the 3 shift fork structures that gearshift adopts help assembly to fall heavily, reduces material and processing cost.In addition, the self-locking of being adopted, interlock mode help the modularization of transmission assembly parts, are convenient to assembling and maintenance, make structure obtain simplifying, and have improved the reliability of gearshift.

Description of drawings

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

Fig. 2 is the part sectioned view of the utility model.

Embodiment

Below in conjunction with accompanying drawing the utility model is done further description: a kind of new work transmission gearshift, by one, back fork 1, gear shift fork shaft 2, two, three retaining shift forks 3; One, the guide block 4 that reverses gear, the long elastic cylindrical pin of 30mm 5, four, five retaining shift forks 6; Communtation arm 7, communtation arm bracket assembly 8, split washer 9; Four, five retaining switching-over guide blocks 10, interlocking block 11, four, five retaining speed change guide blocks 12; Switching-over fork shaft 13, self-locking spring assembly 14, the long elastic cylindrical pin 16 of elastic cylindrical pin 15 that 35mm is long and 25mm is formed; It is characterized in that:

As shown in Figure 1, belong to fixedly shift fork through 5 assemblings one of elastic cylindrical pin 15, elastic cylindrical pin, back fork 1 and, the guide block 4, that reverses gear, back fork 1 respectively on the gear shift fork shaft 2.Two, three retaining shift forks 3 and four, five retaining shift forks 6 can slide on gear shift fork shaft 2 through the fork shaft hole.Four, five retaining switching-over guide blocks 10 and four, five retaining speed change guide blocks 12 are assemblied on the switching-over fork shaft 13 through elastic cylindrical pin 5.For preventing 12 run-off the straights of four, five retaining speed change guide blocks, elastic cylindrical pin 16 is installed on guide block 12, the part that pin exposes is passed in the slotted hole of two, three retaining shift forks 3 on inserting, and can in the hole, slide, and is as shown in Figure 2.Communtation arm bracket assembly 8 is fixed on the inboard of housing, and communtation arm 7 is stuck on the bracket assembly 8 by split washer 9, can rotate around its reversing shaft, and the shifting block at while communtation arm two ends lays respectively at dialling in the mouth on four, five retaining switching-over guide blocks 10 and four, the five retaining shift forks 6.On two, three retaining shift forks 3, being inlaid with speed change through casting technique inserts; The mouth of dialling on mouth and, the guide block 4 that reverses gear of dialling on mouth and four, the five retaining speed change guide blocks 12 of dialling on inserting is arranged side by side; Above-mentioned group mouth arranged side by side was worn in interlocking on the interlocking block 11, and was as shown in Figure 2.The self-locking spring assembly 14 of each retaining is fixed on the housing, and the steel ball at top is positioned at corresponding self-locking groove.

Change one, the gearshift shifting block stirs one when reversing gear, thereby the guide block 4 of reversing gear moves one, back fork 1 is realized gearshift; Changing the mouth of dialling that two, three when retaining gearshift shifting blocks stir on two, the three retaining shift forks 3 slides it to realize shifting gears on gear shift fork shaft 2; Change four, five when retaining gearshift shifting blocks and stir dialling mouthful on four, the five retaining speed change guide blocks 12, drive four, five retaining switching-over guide blocks 10, move four, five retaining shift forks 6 through the switching-over effect of communtation arm and realize gearshift.

During block selecting, the shifting block of shifting gears drives the corresponding mouth that keeps off of interlocking block move left and right selection, and when moving to a retaining mouth, remaining retaining mouth was worn in the interlocking on the interlocking block, with its pinning, and the interlocking of realization gear.

After the gearshift, the steel ball that is installed in self-locking spring assembly 14 tops on the housing is positioned at the self-locking groove of this gear, realizes the gear self-locking.

Claims (1)

1. mechanical transmission gearshift, by one, back fork, gear shift fork shaft, two, three retaining shift forks; One, the guide block that reverses gear, the elastic cylindrical pin that 30mm is long, four, five retaining shift forks, communtation arm; The communtation arm bracket assembly, split washer, four, five retaining switching-over guide blocks, interlocking block; Four, five retaining speed change guide blocks, the switching-over fork shaft, the self-locking spring assembly, the long elastic cylindrical pin of elastic cylindrical pin that 35mm is long and 25mm is formed; It is characterized in that: on the gear shift fork shaft respectively through elastic cylindrical pin assembling one, back fork and, the guide block that reverses gear, one, back fork belongs to fixedly shift fork; Two, three retaining shift forks and four, five retaining shift forks can slide on gear shift fork shaft through the fork shaft hole; Four, five retaining switching-over guide blocks and four, five retaining speed change guide blocks are assemblied on the switching-over fork shaft through elastic cylindrical pin; On four, five retaining speed change guide blocks, elastic cylindrical pin is installed; The part that pin exposes is passed in the slotted hole of two, three retaining shift forks on inserting and slides, and the communtation arm bracket assembly is fixed on the inboard of housing, and communtation arm is stuck on the bracket assembly by split washer; Around its reversing shaft rotation, the shifting block at communtation arm two ends lays respectively at dialling in the mouth on four, five retaining switching-over guide blocks and four, the five retaining shift forks; On two, three retaining shift forks, being inlaid with speed change inserts; The mouth of dialling on mouth and, the guide block that reverses gear of dialling on mouth and four, the five retaining speed change guide blocks of dialling on inserting is arranged side by side; The mouth of dialling arranged side by side was worn in interlocking on the interlocking block; The self-locking spring assembly is fixed on the housing, and the steel ball at top is positioned at corresponding self-locking groove.