CN213145243U

CN213145243U - Variable-speed gear with front-mounted gearbox

Info

Publication number: CN213145243U
Application number: CN202021317309.0U
Authority: CN
Inventors: 许春明
Original assignee: Individual
Current assignee: Zhengzhou Hanbang Automotive Parts Co.,Ltd.
Priority date: 2020-07-06
Filing date: 2020-07-06
Publication date: 2021-05-07
Anticipated expiration: 2030-07-06

Abstract

The utility model discloses a leading variable speed device of gearbox, the power distribution box comprises a box body, the case lid, the secondary shaft of setting on the case lid, the primary shaft of setting on the box, the rear gear, the front gear, the sliding sleeve, gearshift, the shift fork, and distribute in secondary shaft both sides and displacement two sets of transition gear sets that differ 180, the ring gear of sliding sleeve meshes with the outer ring gear of secondary shaft, the ring gear of front gear meshes with the outer ring gear of primary shaft, the rear gear cover is established on the secondary shaft, and the ring gear homoenergetic of the ring gear of front gear and the ring gear of rear gear meshes with the outer ring gear of sliding sleeve, the outer ring gear of front gear meshes with two first transition gears of two sets of transition gear sets, two second transition gears of two sets of transition gear sets mesh with the outer tooth of rear gear, wherein, gearshift adopts 545. 841H front and back vice top cap. The utility model discloses can realize change, job stabilization, the long service life of velocity ratio.

Description

Variable-speed gear with front-mounted gearbox

Technical Field

The utility model relates to the technical field of auto-parts, concretely relates to leading variable speed device of gearbox.

Background

At present, heavy trucks are divided into a fast-box heavy truck and a slow-box heavy truck, the fast-box heavy truck is mainly suitable for a highway section, the driving speed is high, the torque is small, and when climbing or bumpy road surfaces are needed, the fast-box heavy truck often cannot continue driving or is flamed out due to insufficient torque, namely an engine is damaged, and a gearbox is easy to break down; the heavy truck with the slow box is mainly suitable for working condition road sections, low-speed torque is high, the heavy truck cannot run at high speed on some highways due to low running speed of the heavy truck, overtaking is difficult to achieve, transportation efficiency is affected, and transportation time is delayed, so that the transmission with a single speed ratio cannot meet the road running requirement of the heavy truck. Because for convenient gearbox batch production and guarantee production quality, generally can use mould and equipment, therefore the structure of current gearbox is stereotyped basically, consequently is inconvenient to improve current gearbox, nevertheless in order to satisfy user's user demand, very needs an auxiliary assembly, neither changes the production of current gearbox, does not destroy original gearbox again.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model provides a can realize change, job stabilization, the leading variable speed gear of gearbox of long service life of velocity ratio.

In order to achieve the above object, the utility model provides a following technical scheme:

a speed-variable device arranged in front of a gearbox comprises a box body, a box cover fixedly connected with the box body, a second shaft arranged on the box cover, a first shaft, a rear gear, a front gear, a sliding sleeve, a gear shifting mechanism arranged on the box body and a shifting fork acting on the sliding sleeve, wherein the inner gear ring of the sliding sleeve is meshed with the outer gear ring of the second shaft, the inner gear ring of the front gear is meshed with the outer gear ring of the first shaft, the rear gear is sleeved on the second shaft, the inner gear ring of the front gear and the inner gear ring of the rear gear can be meshed with the outer gear ring of the sliding sleeve, the speed-variable device further comprises two sets of transition gear sets which are distributed on two sides of the second shaft and have a displacement difference of 180 degrees, the outer gear ring of the front gear is meshed with two first transition gears of the two sets, and the two second transition gears of the two sets are meshed with the outer gear of the, wherein, 545 and 841H front and back sub top covers are adopted in the gear shifting mechanism.

Furthermore, the box cover is provided with a plurality of through holes which are annularly distributed along the axis of the second shaft, the through holes are communicated with corresponding mounting holes on the main gearbox, and the through holes can be used as fixing holes or lubricating holes.

Further, the number of the through holes is six.

Furthermore, two mounting holes are formed in the box cover, two circular bosses are arranged on the inner side face of the box cover, inner cavities of the circular bosses are communicated with the corresponding mounting holes to form bearing holes, the corresponding ends of the two gear set shafts are mounted on the corresponding bearing holes through sealed bearings, and the transition gear sets are fixedly arranged on the corresponding gear set shafts.

Furthermore, a plurality of semicircular notches extending along the axial direction are uniformly distributed on the outer side surface of the circular boss in an annular mode, and the semicircular notches and corresponding bolt fixing connecting holes on the box cover are coaxially arranged.

Furthermore, a plurality of rib plates are arranged on the outer peripheral surface of the box body, and the rib plates extend to the outer edge of the box body.

Further, the box body and the box cover are made of QT500-7 nodular cast iron.

Further, the shifting fork is manufactured by adopting 45 # steel precision forging.

According to the above technical solution, the utility model has the advantages that: because two groups of transition gear sets are distributed on two sides of the second shaft and have a displacement difference of 180 degrees, the stress of the rear gear and the front gear is balanced, the second shaft and the first shaft are prevented from bending and deforming after being used for a long time, the work is stable, and the service life is long; the box body is not easy to damage and crack due to the plurality of rib plates arranged on the box body, the service life is greatly prolonged, and the box body and the box cover are made of nodular cast iron, so that the strength is further enhanced; because the shifting fork is manufactured by adopting 45-grade steel precision forging, the metal density is further enhanced, and serious consequences such as fracture and the like caused by overlong length of the shifting fork are avoided; because the gear shifting mechanism adopts the front and rear auxiliary top covers of 545-841H, the shape is greatly reduced, the weight is further reduced, but the working stroke and the propelling force are not changed, and the smooth and free gear shifting is ensured; the through hole on the box cover can be used as a fixing hole or a lubricating hole, so that the through hole is selected according to actual conditions and is convenient to use; the circular ring boss is arranged at the mounting hole of the box cover, so that the mounting of the closed bearing is facilitated, the strength of the mounting position of the closed bearing is ensured, the weight of a box cover blank can be greatly reduced, and the processing difficulty can be reduced due to the reduction of the thickness of the box cover; because the semicircular notch on the outer side surface of the circular boss and the corresponding bolt fixing connecting hole on the box cover are coaxially arranged, the rigidity of the circular boss can be increased by the mounted bolt head.

In addition to the above-described objects, features and advantages, the present invention has other objects, features and advantages. The present invention will be described in further detail with reference to the drawings.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts. In the drawings:

fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a sectional view taken along a-a of fig. 1.

Fig. 3 is a side sectional view of the case of the present invention.

Fig. 4 is a side sectional view of the case cover of the present invention.

Fig. 5 is a front view of the case cover of the present invention.

Labeled as: the box body 1, the rib plate 101, the box cover 2, the circular ring boss 201, the semicircular notch 202, the through hole 203, the bolt fixing connecting hole 204, the second shaft 3, the rear gear 4, the first shaft 5, the front gear 6, the transition gear set 7, the first transition gear 71, the second transition gear 72, the sliding sleeve 8, the shifting fork 9, the gear shifting mechanism 10 and the gear set shaft 11.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1 to 5, a front variable speed device of a transmission shown in fig. 1 and 2 comprises a box body 1, a box cover 2 fixedly connected with the box body 1, a second shaft 3 arranged on the box cover 2, a first shaft 5, a rear gear 4, a front gear 6, a sliding sleeve 8, a gear shifting mechanism 10 arranged on the box body 1, a shifting fork 9 acting on the sliding sleeve 8, and two sets of transition gear sets 7 which are distributed on two sides of the second shaft 3 and have a displacement difference of 180 degrees, wherein the box body 1 is fixedly connected with an engine case through a plurality of bolts respectively passing through corresponding bolt fixing connection holes 204 on the box cover 2 and fixedly connected with a box body of a main reduction gearbox of an automobile, the first shaft 5 is fixedly connected with the engine shaft, an external spline at the rear end of the second shaft 3 is connected with an internal tooth meshing of an input gear of the main reduction gearbox of the automobile, the inner gear ring of the sliding sleeve 8 is meshed with the outer gear ring of the second shaft 3, the inner gear ring of the front gear 6 is meshed with the outer gear ring of the first shaft 5, the rear gear 4 is sleeved on the second shaft 3, the inner gear ring of the front gear 6 and the inner gear ring of the rear gear 4 can be meshed with the outer gear ring of the sliding sleeve 8, the outer gear ring of the front gear 6 is meshed with the two first transition gears 71 of the two transition gear sets 7, the two second transition gears 72 of the two transition gear sets 7 are meshed with the outer teeth of the rear gear 4, and the two transition gear sets 7 are distributed on two sides of the second shaft 3 and are shifted by 180 degrees, so that the stress of the rear gear 4 and the stress of the front gear 6 are balanced, the second shaft and the first shaft are prevented from being bent and deformed after being used for a long time, the.

As shown in fig. 3, a plurality of rib plates 101 are arranged on the outer peripheral surface of the box body 1, the rib plates 101 extend to the outer edge of the box body 1, so that the box body 1 is not easy to damage and crack, the service life is greatly prolonged, and the box body 1 and the box cover 2 are made of QT500-7 nodular cast iron, so that the strength is further enhanced.

As shown in fig. 4 and 5, the case cover 2 is provided with a plurality of through holes 203 annularly distributed along the axis of the second shaft 3, the through holes 203 are communicated with corresponding mounting holes on the main gearbox, when the connection rigidity between the main gearbox and the automobile main gearbox is insufficient, the through holes 203 are used as fixing holes, and when the connection rigidity between the main gearbox and the automobile main gearbox is sufficient, the through holes 203 are used as lubricating holes, so that the use is convenient according to the selection of actual conditions.

Preferably, the number of the through holes 203 is six.

Two mounting holes have been on case lid 2, be equipped with two ring boss 201 on the medial surface of case lid 2, the inner chamber of ring boss 201 link up with the mounting hole that corresponds and form the dead eye, and the corresponding end of two gear train axles 11 is installed on the dead eye that corresponds through sealed bearing, sets up the installation of ring boss 201 sealed bearing of being convenient for, can reduce the thickness of case lid 2 by a wide margin when guaranteeing the intensity of sealed bearing installation department, and then reduces the blank weight of case lid 2, because case lid 2 thickness reduces, therefore can the energy saving, reduce the processing degree of difficulty, transition gear train 7 is fixed to be set up on the gear train axle 11 that corresponds.

A plurality of semicircular notches 202 extending axially are uniformly distributed on the outer side surface of the circular boss 201 in an annular manner, and the semicircular notches 202 are coaxially arranged with corresponding bolt fixing connection holes 204 on the case cover 2, so that the rigidity of the circular boss 201 can be increased when the mounted bolt head is positioned in the semicircular notch 202.

The shifting mechanism 10 adopts 545-841H front and rear auxiliary top covers, the shape is greatly reduced, the weight is further reduced, but the working stroke and the propelling force are not changed, and the smooth and free shifting is ensured.

The shifting fork 9 is manufactured by adopting 45 # steel precision forging, the metal density is further enhanced, and serious consequences such as fracture and the like caused by overlong length of the shifting fork 9 are avoided.

When the speed ratio of the main reduction box does not need to be changed, the shifting fork 9 drives the sliding sleeve 8 to move so that the sliding sleeve 8 is meshed with the front gear 6, the first shaft 5 drives the front gear 6 to rotate, the front gear 6 drives the sliding sleeve 8 to rotate, and the sliding sleeve 8 drives the second shaft 3 to rotate; when the speed ratio of the main reduction gearbox needs to be changed, the shifting fork 9 drives the sliding sleeve 8 to move so that the sliding sleeve 8 is separated from the front gear 6, the sliding sleeve 8 is meshed with the rear gear 4, the first shaft 5 drives the front gear 6 to rotate, the front gear 6 is meshed with the first transition gear 71 to further drive the second transition gear 72 to rotate, the second transition gear 72 drives the rear gear 4 to rotate, the rear gear 4 drives the second shaft 3 to rotate through the sliding sleeve 8, the external splines at the rear end of the second shaft 3 are meshed with the internal teeth of the input gear of the main reduction gearbox of the automobile, and therefore the speed ratio of the main reduction gearbox of the automobile is changed to meet the driving requirement of the road surface.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A front-mounted variable-speed gear of a gearbox comprises a box body (1), a box cover (2) fixedly connected with the box body (1), a second shaft (3) arranged on the box cover (2), a first shaft (5) arranged on the box body (1), a rear gear (4), a front gear (6), a sliding sleeve (8), a gear shifting mechanism (10) arranged on the box body (1) and a shifting fork (9) acting on the sliding sleeve (8), wherein an inner gear ring of the sliding sleeve (8) is meshed with an outer gear ring of the second shaft (3), an inner gear ring of the front gear (6) is meshed with the outer gear ring of the first shaft (5), the rear gear (4) is sleeved on the second shaft (3), and the inner gear ring of the front gear (6) and the inner gear ring of the rear gear (4) can be meshed with the outer gear ring of the sliding sleeve (8), the gear shifting mechanism is characterized by further comprising two groups of transition gear sets (7) which are distributed on two sides of the second shaft (3) and are displaced by 180 degrees, wherein an outer gear ring of the front gear (6) is meshed with two first transition gears (71) of the two groups of transition gear sets (7), two second transition gears (72) of the two groups of transition gear sets (7) are meshed with outer teeth of the rear gear (4), and the gear shifting mechanism (10) adopts 545-841H front and rear auxiliary top covers.

2. Gearbox front derailleur according to claim 1, characterized in that said cover (2) has a plurality of through holes (203) distributed annularly along the axis of said second shaft (3), said through holes (203) communicating with corresponding mounting holes located on the main derailleur, said through holes (203) being usable as fixing holes or lubrication holes.

3. Gearbox front variable device according to claim 2, characterized in that the number of through holes (203) is six.

4. The front variable speed device of the gearbox according to claim 1, wherein the box cover (2) is provided with two mounting holes, the inner side surface of the box cover (2) is provided with two circular bosses (201), inner cavities of the circular bosses (201) are communicated with the corresponding mounting holes to form bearing holes, corresponding ends of two gear set shafts (11) are mounted on the corresponding bearing holes through closed bearings, and the transition gear set (7) is fixedly arranged on the corresponding gear set shafts (11).

5. The front variable speed device of the gearbox according to claim 4, characterized in that a plurality of axially extending semicircular notches (202) are evenly distributed on the outer side surface of the circular boss (201) in a circular manner, and the semicircular notches (202) are coaxially arranged with corresponding bolt fixing connection holes (204) on the box cover (2).

6. The front variable speed device of the gearbox according to claim 1, characterized in that a plurality of rib plates (101) are arranged on the outer circumferential surface of the box body (1), and the rib plates (101) extend to the outer edge of the box body (1).

7. Gearbox front variable device according to claim 1, characterized in that the box (1) and box cover (2) are made of QT500-7 ductile iron.

8. Gearbox front variable device according to claim 1, characterized in that the shift fork (9) is manufactured by precision forging of steel No. 45.