CN104421385A - The gear structure of the transmission - Google Patents

Abstract

The present invention provides a gear structure of a transmission device. The transmission device comprises an intermediate low-speed gear, an intermediate high-speed gear and an engagement sleeve. The intermediate low-speed gear is provided with a low-speed gear body and a raised portion embedded with the low-speed gear body by means of the driving force. The axial end portion of the raised portion is provided with a tooth embedded claw and a flared diameter portion. The intermediate low-speed gear is embedded onto an intermediate shaft in an axially non-movable and rotatable manner. The intermediate high-speed gear is provided with a high-speed gear body and a cylindrical portion. The cylindrical portion is composed of a tooth embedded claw at one end portion thereof. The intermediate high-speed gear is embedded onto the raised portion in an axially non-movable and rotatable manner. The engagement sleeve is embedded onto the intermediate shaft in a movable mannera and is positioned at one side of the intermediate high-speed gear.

Description

The gear structure of speed change gear

Technical field

The present invention relates to a kind of gear structure of speed change gear, when this speed change gear is formed at operation single clutch collar, realize the speed change between multiple gear.

Background technique

Known speed change gear realizes the speed change between multiple gear when being formed at the single clutch collar of operation.Fig. 6 shows traditional speed change gear.In the right part of the input shaft 100 of speed change, configure low-speed forward motion low speed gear 110 and the motion high gear 120 that advances at utmost speed adjacent to one another in the axial direction.Then, motion reverse gear 130 is backward configured with in the left part of input shaft 100.In addition, clutch collar 140 axially movably spline be entrenched in middle body.

Low speed gear 110 comprises the convex portion 111 extended from low speed gear main body 113 left, main body 113 is provided with the wheel tooth formed on its outer circumferential face, and this low speed gear 110 is fitted on input shaft 100 rotationally, arranges needle bearing between low speed gear 110 and input shaft 100.Then, dental inlay pawl (dog claw) 112 is formed in the left part of convex portion 111.

High gear 120 comprises cylindrical portions 121, this cylindrical portions 121 is such as to extend from the mode of high gear main body 123 opening left, this high gear main body 123 is provided with the wheel tooth formed on its outer circumferential face, and this high gear 120 is fitted on the outer circumferential face of convex portion 111 rotationally, arranges needle bearing between high gear 120 and the outer circumferential face of convex portion 111.Then, dental inlay pawl 122 is formed with in the left part of cylindrical portions 121.

Reverse gear 130 comprises the dental inlay pawl 131 of the right side being formed at reverse gear main body, this reverse gear main body is provided with the wheel tooth formed on its outer circumferential face, and reverse gear 130 is fitted on input shaft 100 rotationally, arranges needle bearing between reverse gear 130 and input shaft 100.

Clutch collar 140 comprises the pawl of motion dental inlay backward 141 being formed at left part and the progressive motion dental inlay pawl 142 being formed at right part.Move in the axial direction at clutch collar 140, when making clutch collar 140 enter to connect the state of (dogcoupling) with any one in reverse gear 130, low speed gear 110 and high gear 120 is castellated, in input shaft 100 and the transmission being fitted in the gear 110,120 or 130 of input shaft 100 between any one to realize driving force rotationally.

The left side of the convex portion 111 of low speed gear 110 is provided with pressing body 102, and this pressing body 102 is fitted in the axial direction and inserts between dental inlay pawl 112, and this pressing body 102 is diametrically to external expansion.Pressing body 102 roughly abuts with the left part of convex portion 111 and roughly abuts with the left part of the high gear main body 123 of high gear 120.This achieve the location in the axial direction, left part of both gears 110 and 120.Pressing body 102 utilizes packing ring 103 and 104 to be axially immovably configured on input shaft 100 by using circlip 105.As prior art document, known Japanese Unexamined Patent Publication 2002-213611 publication.

Summary of the invention

Meanwhile, when low speed gear 110 and high gear 120 will be installed to input shaft 100, first, low speed gear 110 will be installed to the outer circumferential face of input shaft 100, between low speed gear 110 and the outer circumferential face of input shaft 100, arrange needle bearing.Then, in the mode adjoined with the left side of low speed gear main body 113 via packing ring 106, high gear 120 is installed to the outer circumferential face of convex portion 111 from left side, between high gear 120 and the outer circumferential face of convex portion 111, arrange needle bearing.Thereafter, to be fitted together in the axial direction and to insert the mode between dental inlay pawl 112, pressing body 102 is installed in the mode such as roughly abutted with the left part of convex portion 111 and the left part of high gear main body 123.In addition, in the left side of pressing body 102, circlip 105 utilizes packing ring 103 and 104 to be axially immovably configured on input shaft 100.

In this case, after installation high gear 120, pressing body 102, packing ring 103 and 104 and circlip 105 need the inner side being installed to cylindrical portions 121 from left side.Therefore, the assembling operation of these constituent elementss and the Inspection of assembled state all need time and efforts.

Make the present invention in view of the above problems.The object of the invention is the assembling operation improving following speed change gear, this speed change gear is configured to utilize single clutch collar to realize the speed change between multiple gear.

To achieve these goals, the invention provides a kind of gear structure of speed change gear, it comprises:

First gear, described first gear is provided with the first gear body and convex portion, the first wheel tooth that the outer circumferential face that described first gear body is included in described first gear body is formed, described convex portion is fitted to the inside diameter of described first gear body with can transmitting driving force, the end that described convex portion extends on an axial direction is provided integrally with the first dental inlay pawl and wide diameter portion, and described first gear shaft is to immovably and be fitted to the outer circumferential face of transmission shaft rotationally;

Second gear, described second gear is provided with the second gear body and cylindrical portions, the one that described second gear body is configured in described first gear body to, and the second wheel tooth that the outer circumferential face that described second gear body is included in described second gear body is formed, described cylindrical portions is included in from described second gear body along one to the second dental inlay pawl that forms of end extended, and described second gear shaft is to immovably and be fitted to the outer circumferential face of described convex portion rotationally; And

Clutch collar, described clutch collar axially movably spline is fitted to described transmission shaft, and described clutch collar is configured in the one of described second gear upwards, described clutch collar comprises the clutch collar side dental inlay pawl that can engage with described first dental inlay pawl and described second dental inlay pawl

Wherein, described second gear body is axially immovably configured between described first gear body and described wide diameter portion.

According to said structure, the first gear is configured to be divided into the first gear body and convex portion.This allows the second gear to install from the opposite side of this first gear.By means of this, at configuration location, the inner side of the cylindrical portions axially extended relative to one of the second gear constituent elements, and this location constituent elements is positioned at the axial side of the first gear and the second gear, before installation second gear, location constituent elements can be installed on transmission shaft.Namely, avoid following work: after the second gear is installed to transmission shaft, location constituent elements is installed in the inner side being difficult to the cylindrical portions seen in inner side.

In addition, wide diameter portion can be formed in convex portion with the first dental inlay pawl.Therefore, the quantity of the constituent elements of the inner side being configured at cylindrical portions can be reduced.Correspondingly, the assembling operation of the inner side being difficult to the cylindrical portions seen in inner side can be avoided, and the quantity of the constituent elements of the inner side being configured at cylindrical portions can be reduced.Which increase the assembling operation of speed change gear.

In the gear structure of above-mentioned speed change gear, can preferably adopt following structure.

(1) the other end of the other end of described first gear body and the described convex portion of described first gear is presented axially in roughly the same position.

According to above-mentioned structure (1), when the other end of confirmation first gear body is roughly positioned at identical position with the other end of convex portion, the assembled state of gear structure easily can be checked.

(2) described first gear body spline is fitted to the outer circumferential face of described convex portion.

According to above-mentioned structure (2), even if in the structure being split into the first gear body and convex portion at the first gear, the first gear body also can be connected to convex portion, thus can transmit driving force.

(3) for supporting the opposite side of Bearing configuration at described first gear of the other end of described transmission shaft rotationally at housing structure, the internal diameter of described bearing is less than the internal diameter of described convex portion.

According to above-mentioned structure (3), when the first gear and the second gear etc. being removed from transmission shaft when carrying out maintenance etc., the installation and removal of gear can be realized from the opposite side of transmission shaft.Therefore, do not need to remove other constituent elements that such as clutch collar etc. is positioned at side.This allows easily to remove the first gear and the second gear etc., therefore improves the maintainalbility of speed change gear.

(4) under the state arranging above-mentioned structure (3), described first gear is low-speed forward motion low speed gear, and described second gear is the motion high gear that advances at utmost speed.

According to above-mentioned structure (4), the present invention preferably can be embodied as the gear structure of following speed change gear, and the gear structure of this speed change gear comprises low-speed forward motion low speed gear and the motion high gear that advances at utmost speed.In addition, the low speed gear tending to be transfused to high pulling torque is configured near the bearing for supporting transmission shaft.This easily inhibits the flexure of transmission shaft.

Accompanying drawing explanation

Fig. 1 is the left side view of the multi-purpose vehicle of the speed change gear comprised according to an embodiment of the present invention.

Fig. 2 is the plan view of motor, V-type variable v-belt drive (V-belt type continuously variabletransmission) and speed change gear (transmission).

Fig. 3 shows the right side view of the speed change gear of the inside of speed change gear.

The unfolded drawing that the line IV-IV along Fig. 3 that Fig. 4 shows the engagement of gear intercepts.

Fig. 5 is the sectional view intercepted along the line V-V of Fig. 3.

Fig. 6 shows the sectional view of the speed change gear of the structure had according to conventional art.

Embodiment

Below, one embodiment of the present invention is described with reference to the accompanying drawings.Here, for convenience of description, the fore-and-aft direction of multi-purpose vehicle is also used to indicate the fore-and-aft direction of speed change gear and other constituent elements.In addition, in the vehicle width direction, the left and right directions (left and right when namely, observing front from multi-purpose vehicle) that the occupant of multi-purpose vehicle observes also is used to indicate the left and right directions of speed change gear and other constituent elements.

The left side view of multi-purpose vehicle that Fig. 1 comprises speed change gear according to the present embodiment, that remove the housing composition components such as such as car door.As shown in Figure 1, multi-purpose vehicle comprises: be positioned at anterior pairing left and right front wheel 11; With the pairing left and right rear wheel 12 being positioned at rear portion.Then, the space 14 by bus surrounded by ROPS 13 is arranged between front wheel 11 and rear wheel 12, and load bed 15 is arranged on the rear in space 14 by bus.ROPS 13 is abbreviations of overturning safeguard structure.

The inside in space 14 is provided with by bus: form the floor panel 16 on floor, front stall 17 and back seat 18.Be formed with engine compartment 19, and this engine compartment 19 extends to a part for the below of load bed 15 from a part for the below of back seat 18.Motor 20, speed change gear 1 and V-type variable v-belt drive 24 is configured with in engine compartment 19.

Fig. 2 is the plan view of engine compartment 19, shows the inside of V-type variable v-belt drive 24 in the mode of having an X-rayed.Motor 20 is configured to make the axis of bent axle 21 consistent with vehicle-width direction.Speed change gear (gear transmission) 1 is configured in the rear of motor 20.V-type variable v-belt drive 24 is configured in the left surface of motor 20 and speed change gear 1.The speed change gear shell 2 forming the shell of speed change gear 1 is made up of pairing left and right housing structure 2L and 2R be connected to each other at central fitting surface place.

Speed change gear 1 is constructed such that the driving force be input to for the input shaft 3 of speed change is also delivered to two-wheel drive-four-wheel drive switching mechanism 29 and the transmission shaft 22 for front wheel 11 subsequently with the deceleration of predetermined reduction gear ratio, meanwhile, driving force is sent to live axle 23 from the output shaft 8 (only axis being shown) for rear wheel 12.

V-type variable v-belt drive 24 comprises: live axle 25, and it is coupled to the bent axle 21 of motor 20; Driving pulley 26, it is configured on live axle 25; Driven pulley 27, it is configured on the input shaft 3 of speed change gear 1; And V-type band 28, it reels around driving pulley 26 with between band belt wheel 27.Then, V-type variable v-belt drive 24 is constructed such that the driving force from the bent axle 21 of motor 20 is automatically slowed down according to the load on the rotating speed of bent axle 21 and speed change gear 1 and is sent to the input shaft 3 of speed change gear 1 subsequently.

Fig. 3 shows the right side view of the inside of the speed change gear 1 removing right side housing structure 2R (see Fig. 2).In speed change gear 1, configure input shaft 3, reverse idler gear axle 4, jack shaft (transmission shaft) 5, the output shaft 6 for front wheel 11, the intermediate output shaft 7 for rear wheel 12 and the output shaft 8 for rear wheel 12 successively from front, their axis is directed along vehicle-width direction.Then, these axles are supported rotationally by the left and right sidewall of transmission case 2.Reverse shift fork 554 and sliding selector shaft 555 are arranged on the rear of jack shaft 5.

The unfolded drawing that the line IV-IV along Fig. 3 that Fig. 4 shows the engagement of each axle in speed change gear 1 intercepts.Input shaft 3, jack shaft 5, output shaft 6 and intermediate output shaft 7 utilize the bearing between them rotatably to support by left and right housing structure 2L, 2R.

The driving force inputted from input shaft 3 is sent to jack shaft 5 by reverse idler gear axle 4.Jack shaft 5 by slowed down and subsequently from input shaft 3 directly input driving force or be sent to output shaft 6 from input shaft 3 by the driving force that reverse idler gear axle 4 inputs.When driving force being sent to intermediate output shaft 7, output shaft 6 optionally by two-wheel drive-four-wheel drive switching mechanism 29 and bevel gear 621 driving force is sent to for front wheel 11, the transmission shaft 22 that extends in the longitudinal direction.The driving force of output shaft 6 is sent to output shaft 8 by intermediate output shaft 7.Driving force is sent to the live axle 23 for rear wheel 12 by output shaft 8.

Input shaft 3 is provided with input gear group 30 thereon, and this input gear group 30 comprises the input of the motion backward reverse gear 31, the motion that advances at utmost speed input high gear 32 and the low-speed forward motion input low speed gear 33 that configure successively from left side.Input reverse gear 31 is formed on input shaft 3.But input high gear 32 and the axial immovably spline of input low speed gear 33 are entrenched on input shaft 3.

The reverse idler gear of motion backward 41 always engaged with input reverse gear 31 utilizes needle bearing to be configured in rotationally on reverse idler gear axle 4.

On jack shaft 5, set gradually middle output gear 50 and center tooth wheels 51 from left side.Center tooth wheels 51 comprise the middle reverse gear 52 for moving backward, the middle high gear 53 moved for advancing at utmost speed and the middle low speed gear 54 for low-speed forward motion.Clutch collar 55 axially movably spline is entrenched between middle reverse gear 52 and middle high gear 53.Middle output gear 50 is formed on jack shaft 5.Then, each gear 52 to 54 of center tooth wheels 51 is all configured on jack shaft 5 rotationally.

Each gear 52 to 54 of center tooth wheels 51 always engages respectively with the corresponding gear 31 to 33 of input gear group 30.Namely, middle reverse gear 52 is configured in the mode such as always engaged with input reverse gear 31 by reverse idler gear 41.In addition, middle high gear 53 configures in the mode such as always engaged with input high gear 32.Similarly, middle low speed gear 54 configures in the mode such as always engaged with input low speed gear 33.Therefore, the driving force being input to input shaft 3 is sent to jack shaft 5 by the castellated connection between any one in the gear 52 to 54 of center tooth wheels 51 and clutch collar 55.Below, detailed description is provided with reference to Fig. 5.

Fig. 5 is the sectional view intercepted along the line V-V of Fig. 3.Middle reverse gear 52 comprises the pawl of the motion dental inlay backward 52a being arranged at right side, and this middle reverse gear 52 utilizes needle bearing to be configured in rotationally on jack shaft 5.

Middle low speed gear 54 utilizes needle bearing 91 to be configured on jack shaft 5 rotationally, and this middle low speed gear 54 is split into the convex portion 541 and low speed gear main body 542 (the first gear body) that extend left, and this low speed gear main body 542 is provided with the wheel tooth (the first wheel tooth) be formed on its outer circumferential face.The dental inlay pawl 541a (the first dental inlay pawl) for low-speed forward motion is integrally formed with at the left end edge of convex portion 541.In addition, wide diameter portion 541b is integrally formed with on the right side of dental inlay pawl 541a.Low speed gear main body 542 spline is fitted on the outer circumferential face on the right side of convex portion 541.

Middle high gear 53 is configured to utilize packing ring 594 to adjoin with the left side of low speed gear main body 542, and this middle high gear 53 utilizes needle bearing 93 to be configured in rotationally on the outer circumferential face of convex portion 541.Here, high gear main body 532 (the second gear body) and cylindrical portions 531 are formed in middle high gear 53, high gear main body 532 is provided with the wheel tooth (the second wheel tooth) be formed on outer circumferential face, and cylindrical portions 531 extends left from high gear main body 532.The dental inlay pawl 531a (the second dental inlay pawl) for the motion that advances at utmost speed to interior orientation in diametric(al) is integrally formed with at the left end of cylindrical portions 531.

The dental inlay pawl 551 for moving backward is formed in the left side of clutch collar 55.In addition, the right side of clutch collar 55 is formed in for the dental inlay pawl 552 (clutch collar side dental inlay pawl) of progressive motion.

Guarantee that the axially spaced-apart between dental inlay pawl 531a and dental inlay pawl 541a is following scope: the dental inlay pawl 552 of moveable in the axial direction clutch collar 55 can temporarily be in does not set up with dental inlay pawl 531a or dental inlay pawl 541a the neutral state connected.

The outer circumferential face of clutch collar 55 is provided with peripheral annular groove 553.Then, single reverse shift fork 554 is fitted in peripheral annular groove 553.Reverse shift fork 554 is fixed to sliding selector shaft 555, and this sliding selector shaft 555 is supported by left and right housing structure 2L and 2R.Sliding selector shaft 555 is configured to removable in the axial direction in response to the gear-change operation of driver.

Any one showing in both dental inlay pawls 551 and 552 of clutch collar 55 and dental inlay pawl 52a, 531a and 541a of center tooth wheels 51 of Fig. 5 does not all have the castellated neutral state connected.When clutch collar 55 is moved to the left from neutral state, the dental inlay pawl 551 of clutch collar 55 engages with the dental inlay pawl 52a of middle reverse gear 52.On the contrary, when clutch collar 55 moves right from neutral state, the dental inlay pawl 552 of clutch collar 55 engages with the dental inlay pawl 531a of middle high gear 53.Then, when clutch collar 55 moves right further, after neutral state, the dental inlay pawl 552 of clutch collar 55 engages with the dental inlay pawl 541a of middle low speed gear 54.

Namely, when single reverse shift fork 554 moves in the axial direction, make to set up castellated connection between clutch collar 55 and each gear of center tooth wheels 51, the driving force being input to center tooth wheels 51 from input gear group 30 is sent to jack shaft 5 by clutch collar 55.Therefore, gear optionally can change between following four gears: advance at utmost speed gear, and in the middle of this gear, high gear 53 and jack shaft 5 are coupled to each other with can transmitting driving force; Low-speed forward gear, in the middle of this gear, low speed gear 54 and jack shaft 5 are coupled to each other with can transmitting driving force; Retreat gear, in the middle of this gear, reverse gear 52 and jack shaft 5 are coupled to each other with can transmitting driving force; And neutral position, in the gear 52 to 54 of these position center tooth wheels 51, neither one is connected to jack shaft 5 with can transmitting driving force.

Middle reverse gear 52 is axially immovably configured in and is fixed between the middle output gear 50 of jack shaft 5 and circlip 57, and pairing left and right packing ring 591 is at middle reverse gear 52 and be fixed between the middle output gear 50 of jack shaft 5 and circlip 57.The convex portion 541 of middle low speed gear 54 and two packing rings 592 in left part and be axially immovably configured in together with the major diameter packing ring 593 of right part between the stepped part 5a of jack shaft 5 and the bearing 58 for the right part that supports jack shaft 5.Middle high gear 53 utilizes pairing left and right packing ring 594 to be configured between the wide diameter portion 541b of convex portion 541 and low speed gear main body 542.

Each gear 52 to 54 of center tooth wheels 51 is configured in rotationally on jack shaft 5 and also utilizes packing ring 591 to 594 therebetween axially immovably to configure.Namely, the sliding parts between jack shaft 5 and each gear 52 to 54 of center tooth wheels 51 is made up of packing ring 591 to 594.Then, in each sliding parts, inhibit the abrasion of each gear 52 to 54 and/or jack shaft 5.

Here, in the right part of jack shaft 5, the external diameter (namely, the internal diameter of bearing 58) of the bearing embedding part 5b of chimeric bearing 58 is configured to less than the internal diameter of convex portion 541.Therefore, convex portion 541 can be installed to the outer circumferential face of jack shaft 5 from right side.In addition, the internal diameter of middle high gear 53 is configured to larger than the external diameter of convex portion 541, and middle low speed gear 54 is split into convex portion 541 and low speed gear main body 542.Therefore, middle high gear 53 can be installed to the outer circumferential face of convex portion 541 from right side.

Namely, middle low speed gear 54 and middle high gear 53 can be installed on jack shaft 5 as follows.First, two packing rings 592 are installed from the right side of jack shaft 5, thus are positioned at stepped part 5a.Then, the convex portion 541 of middle low speed gear 54 is installed to jack shaft 5 from right side, thus is positioned at the right side of packing ring 592, wherein, between the convex portion 541 and jack shaft 5 of middle low speed gear 54, arranges needle bearing 91.Then, middle high gear 53 is installed from the right side of jack shaft 5, make the left part of high gear main body 532 be positioned to utilize packing ring 594 to adjoin with the wide diameter portion 541b of convex portion 541, and this high gear main body 532 utilize needle bearing 93 to be configured on the outer circumferential face of convex portion 541.

Then, low speed gear main body 542 is installed from the right side of jack shaft 5, thus utilizes packing ring 594 to adjoin with the right flank of high gear main body 532, and this low speed gear main body 542 spline is fitted on the outer circumferential face of convex portion 541.Meanwhile, when confirming that the right flank of convex portion 541 and the right flank of low speed gear main body 542 are roughly positioned at identical position, can draw, the constituent elements of similar packing ring has been installed when not having excessive and not enough.

Finally, when major diameter packing ring 593 is installed from the right side of jack shaft 5, being positioned at least partially on jack shaft 5 of the right part of convex portion 541 and the right part of low speed gear main body 542.The right part of major diameter packing ring 593 is supported by bearing 58.Namely, middle low speed gear 54, middle high gear 53, other packing ring etc. can be installed to jack shaft 5 from right side.This allow the inner side by being configured in cylindrical portions 531, the constituent elements group of similar packing ring is assembled into jack shaft 5 in advance.Therefore, avoid this constituent elements group after the assembling of middle high gear 53 and be installed to the inner side of cylindrical portions 531.

Then, turn back to Fig. 4, below describe output shaft 6, intermediate output shaft 7 and output shaft 8.As shown in Figure 4, output shaft 6 comprises the first output shaft 61 and the second output shaft 62, and this second output shaft 62 is positioned at the right of the first output shaft 61.On the first output shaft 61, be axially immovably provided with input gear 611 and output gear 612 successively from left side, input gear 611 always engages with the middle output gear 50 of jack shaft 5, and output gear 612 is for being sent to intermediate output shaft 7 by driving force.Bevel gear 621 is formed on the right part of the second output shaft 62.Then, by bevel gear 621, driving force is sent to transmission shaft 22.

Two-wheel drive-four-wheel drive switching mechanism 29 comprises two-wheel drive-four-wheel drive and switches sleeve 63, and this two-wheel drive-four-wheel drive switches sleeve 63 and is fitted to the left part of the second output shaft 62 from the right part of the first output shaft 61 by axially movably spline.Fig. 4 shows two-wheel drive-four-wheel drive and switches the state that sleeve 63 is only positioned at the second output shaft 62, namely, and the state that the first output shaft 61 and the second output shaft 62 are not coupled to each other.From this state, two-wheel drive-four-wheel drive switch sleeve 63 move in the axial direction in the mode such as striding across the right part of the first output shaft 61 and the left part of the second output shaft 62 by two-wheel drive-four-wheel drive switching actuator (not shown) time, the first output shaft 61 and the second output shaft 62 are coupled to each other.

Namely, when two-wheel drive-four-wheel drive switching sleeve 63 moves in the axial direction, switching is achieved between two-wheel drive mode and four-wheel drive pattern, in two-wheel drive mode, first output shaft 61 and the second output shaft 62 are not coupled to each other, thus driving force is only sent to the live axle 23 driven for rear wheel, in four-wheel drive pattern, first output shaft 61 and the second output shaft 62 are coupled to each other, thus driving force is sent to transmission shaft 22 and live axle 23.

On intermediate output shaft 7, be provided with the middle output gear wheels 70 for rear wheel 12, these middle output gear wheels 70 comprise output gear 71 and input gear 72.Input gear 72 always engages with the output gear 612 of the first output shaft 61.

On output shaft 8, be provided with final reducing gear 81, driving force is sent to this final reducing gear 81 by the gear wheel in large diameter 82 always engaged with the output gear 71 of intermediate output shaft 7.The driving force being sent to final reducing gear 81 is distributed by differential attachment 811 and is sent to the pairing left and right live axle 23 driven for rear wheel.

According to above-mentioned speed change gear 1, the driving force being input to input shaft 3 by V-type variable v-belt drive 24 from the bent axle 21 of motor 20 is with predetermined gear reduction ratio and be sent to output shaft 6 and output shaft 8 with predetermined sense of rotation.As a result, optionally front wheel 11 and rear wheel 12 can be driven at low-speed forward gear, the gear that advances at utmost speed, neutral gear or retrogressing gear.

In addition, when two-wheel drive-four-wheel drive switches sleeve 63 axially the moving of output shaft 6, between all driven four-wheel drive pattern of both the only driven two-wheel drive mode of rear wheel 12 and front wheel 11 and rear wheel 12, switching is achieved.

According to the speed change gear 1 with above-mentioned structure, obtain following effect.

(1) because middle low speed gear 54 is configured to be divided into low speed gear main body 542 and convex portion 541, so middle high gear 53 can be installed from the right side of middle low speed gear 54.Therefore, the inner side of the cylindrical portions 531 extended in the left side of middle high gear 53 is configured with two packing rings 592, to locate the left part axially of this middle high gear 53 and middle low speed gear 54, and before the assembling of middle high gear 53, two packing rings 592 can be installed on jack shaft 5.Namely, can avoid following work: after middle high gear 53 is assembled into jack shaft 5, packing ring 592 is installed in the inner side being difficult to the cylindrical portions 531 seen in inside.

In addition, wide diameter portion 541b is formed on convex portion 541 with the dental inlay pawl 541a moved for low-speed forward.Therefore, the quantity of the constituent elements of the inner side being configured at cylindrical portions 531 can be reduced.Correspondingly, the inner side of the cylindrical portions 531 being difficult in inside see can be avoided to carry out assembly operation, and the quantity of the constituent elements of the inner side being configured at cylindrical portions 531 can be reduced.Which increase the assembling operation of speed change gear 1.

(2) when confirming that the right flank of convex portion 541 and the right flank of low speed gear main body 542 are roughly positioned at identical position, the assembled state of gear structure can easily be checked.

(3) although middle low speed gear 54 is configured to be divided into convex portion 541 and low speed gear main body 542, two-part 541 and 542 each other spline are fitted together to.This permission easily carries out transmission of power between convex portion 541 and low speed gear main body 542.

(4) when maintenance waits, when removing middle high gear 53 and middle low speed gear 54 from jack shaft 5, when other constituent elements such as middle reverse gear 52 and clutch collar 55 being such as positioned at the left side of these gears 53 and 54 not being removed, the installation and removal of middle high gear 53 and middle low speed gear 54 easily can be realized from the left side of jack shaft 5.Which increase the maintainalbility of speed change gear 1.

(5) the present invention preferably can be embodied as the gear structure of the speed change gear 1 being provided with low-speed forward gear and advancing at utmost speed gear.In addition, the middle low speed gear 54 tending to be transfused to high pulling torque is configured near the bearing 58 of jack shaft 5.This easily inhibits the flexure of jack shaft 5.

When without prejudice to scope and spirit of the present invention described by claim, various modification and change can be carried out.

Claims (5)

1. A gear structure of a transmission, comprising: A first gear, the first gear is provided with a first gear main body and a protruding part, the first gear main body includes first gear teeth formed on the outer peripheral surface of the first gear main body, and the protruding part can Fitted to the inner diameter portion of the first gear main body to transmit driving force, the protruding portion is integrally provided with a first claw and an enlarged diameter portion at an end extending in one direction of the axial direction, and the first a gear axially immovably and rotatably fitted to the outer peripheral surface of the transmission shaft; The second gear, the second gear is provided with a second gear main body and a cylindrical portion, the second gear main body is arranged in the one direction of the first gear main body, and the second gear main body is included in the The second gear teeth are formed on the outer peripheral surface of the second gear body, and the cylindrical portion includes a second tooth integrally formed at an end extending from the second gear body in one direction of the axial direction. claws, and the second gear is axially immovably and rotatably fitted to the outer peripheral surface of the protruding portion; and an adapter sleeve axially movably spline-fitted to the transmission shaft and arranged at a position closer to the one direction than the second gear, the adapter sleeve includes a a sleeve-side jaw engaged by said first jaw and said second jaw, Wherein, the second gear main body is disposed between the first gear main body and the diameter-enlarging portion in an axially non-movable manner. 2. The gear structure of the speed change device according to claim 1, characterized in that, The other end of the first gear main body and the other end of the protrusion portion of the first gear are located at substantially the same position in the axial direction. 3. The gear structure of the speed change device according to claim 1, characterized in that, The first gear main body is spline-fitted to the outer peripheral surface of the boss portion. 4. The gear structure of the speed change device according to claim 1, characterized in that, A bearing for rotatably supporting the other end of the transmission shaft at the housing member is disposed on the other side of the first gear, and the inner diameter of the bearing is smaller than that of the convex portion. 5. The gear structure of the speed change device according to claim 4, characterized in that, The first gear is a low gear for low-speed forward motion, and the second gear is a high-speed gear for high-speed forward motion.