CN212203082U - Shifting fork structure of gear shifting gear box - Google Patents

Abstract

The utility model discloses a shifting fork structure of a gear shifting gear box, which comprises a shifting fork shaft and two opposite shifting fork arms, wherein the shifting fork arms and the shifting fork shaft are fixedly connected in a synchronous rotating way; the shifting fork shaft is of a three-section combined structure and is sequentially divided into a first section, a middle section and a tail section in the axial direction of the shifting fork shaft; the shifting fork arm fixedly connects two adjacent sections of the shifting fork shaft together. By adopting the utility model, the axial direction of the shifting fork shaft is divided into a head section, a middle section and a tail section, the head and the tail ends of the shifting fork shaft are respectively and rotatably arranged on the gear box, the two adjacent sections of the shifting fork shaft are respectively connected through the shifting fork arm, the three sections of the shifting fork shaft can compensate the requirement of coaxiality between the two adjacent sections of the shifting fork shaft through installation and adjustment during installation, the coaxiality requirement of two bearing holes on the gear box at the two ends of the shifting fork shaft is correspondingly reduced, the processing difficulty and the processing cost of the shifting fork shaft are also reduced, and the assembly of the shifting fork shaft is facilitated; the problem of jamming and unsmooth of the shifting fork shaft caused by the assembling precision is eliminated, and the phenomenon of repeated assembly and disassembly is avoided.

Description

Shifting fork structure of gear shifting gear box

Technical Field

The utility model relates to a shift fork structure, especially a shift fork structure of gear shifting gear box.

Background

The existing gear box mostly adopts a gear shifting gear box for meeting the production requirement. Generally, the gear shifting gearbox has two speed ratios, and a hydraulic cylinder (or a pneumatic cylinder or a manual cylinder) is used as a power source. The shifting spline is enabled to be combined with the gear pairs with different speed ratios through the shifting fork mechanism, and the effect of transmitting different speed ratios is achieved. The gear shifting gear box successfully realizes multiple purposes of a heavy speed reducer, and compared with a common speed reducer, the gear shifting gear box has the technical core of a shifting fork gear shifting mechanism. The gear shifting flexibility, the machining and assembling operability and the use reliability of the mechanism are important for the normal work of the equipment.

The fork shaft part of the fork mechanism of the prior gear box is shown in figure 1. The shifting fork shaft is a long shaft, and the coaxiality of bearing holes of the box body at two ends of the shifting fork shaft is high in requirement in the mode. Under the condition that the span of the box body is large, the box body is difficult to machine and meet the requirements, so that the shifting fork shaft is difficult to assemble and the gear shifting is not smooth; and the shifting fork arms on the two sides need to be welded in a centering way before being installed. The mode has high requirement on the mounting precision, and when the shifting fork shaft is mounted and is subjected to bending deformation, the centering performance of the shifting fork arms on two sides is changed. The shifting fork arms on two sides are staggered, and the gear shifting is blocked.

In addition, the prior mechanism shifting spline housing part is shown in fig. 2. The shifting spline consists of a spline seat, a spline sleeve and an external spline gear. This method has many parts and high cost. And the strength of the externally splined gear cannot be increased due to special space limitations. In addition, the spline seat and the shaft are connected through double keys, so that the machining precision of the key groove is high, the strength is low, and the failure probability is high.

Disclosure of Invention

The utility model aims to provide a: the shifting fork structure of the gear shifting gear box is low in requirement on coaxiality of two ends of the shifting fork shaft.

In order to realize the purpose of the utility model, the utility model provides a following technical scheme:

a shifting fork structure of a gear shifting gear box comprises a shifting fork shaft and two opposite shifting fork arms, wherein the shifting fork arms and the shifting fork shaft are fixedly connected in a synchronous rotating mode; the shifting fork shaft is of a three-section combined structure and is sequentially divided into a first section, a middle section and a tail section in the axial direction of the shifting fork shaft; the shifting fork arm fixedly connects two adjacent sections of the shifting fork shaft together.

By adopting the technical scheme in the utility model, the axial of declutch shift shaft is divided into the first section, the middle section and the tail section, the head and the tail ends of declutch shift shaft are respectively rotatably arranged on the gear box, the two adjacent sections of declutch shift shaft are respectively connected through the declutch shift arm, the three sections of declutch shift shaft can compensate the requirement of coaxiality between the two adjacent sections of declutch shift shaft through installation and adjustment when in installation, the coaxiality requirement of two bearing holes on the gear box at the two ends of the declutch shift shaft is correspondingly reduced, the processing difficulty and the processing cost of the declutch shift shaft are also reduced, and the assembly of the declutch shift; the problem of jamming and unsmooth of the shifting fork shaft caused by the assembling precision is eliminated, and the phenomenon of repeated assembly and disassembly is avoided.

Furthermore, the shifting fork arm consists of a shifting fork main body with a first flange plate and a second flange plate which is detachably and fixedly connected with the first flange plate; the second flange plate and the first flange plate of the shifting fork main body are respectively matched and positioned with the corresponding sections of the shifting fork shaft in a shaft hole forming mode. The adjacent sections (such as the first section and the middle section, or the middle section and the tail section) of the shifting fork shaft are respectively clamped into the first flange plate or the second flange plate, the requirement on the coaxiality between the two adjacent sections of the shifting fork shaft can be weakened by the mode, namely, the requirement on the coaxiality of two bearing holes on a gear box through which the two ends of the shifting fork shaft penetrate is weakened, the processing difficulty and the processing cost of the shifting fork shaft are also reduced, and the assembly of the shifting fork shaft is facilitated; the clamping problem of the shifting fork shaft caused by the assembling precision is reduced, and repeated disassembly and assembly of the shifting fork shaft are reduced.

Furthermore, a positioning hole is formed between the combination surfaces of the first flange plate and the second flange plate; a portion of the positioning hole is formed in the first flange, and another portion of the positioning hole is formed in the second flange and extends radially inward from an outer edge of the flange. Can ensure that the phase place of the adjacent section circumferencial direction of declutch shift shaft satisfies the design requirement through set up the elasticity cylindric lock in the locating hole, and then ensure that two declutch shift arms phase place on the declutch shift shaft keeps unanimous, this kind of design specially adapted non-round hole post hole complex component.

Further, the second flange plate and the first flange plate are detachably and fixedly connected through bolts and nuts. The connection and the disassembly are both convenient.

Furthermore, the shifting fork arm is of a cantilever structure, and a shifting fork pin is arranged at the free end of the shifting fork arm; shifting fork pin clearance fit is in the ring channel of the spline housing of shifting, and the spline housing of shifting passes through the movably connection of spline fit structure on the integral key shaft, and the spline housing of shifting can combine with the gear of shifting at both ends respectively through the external tooth. The shifting fork arm is connected with the shifting spline housing, and the shifting spline housing can be driven to move along the axial direction of the spline shaft through the shifting fork arm, so that the shifting operation is performed.

Furthermore, the gear shifting gears at the two ends comprise a left gear shifting gear and a right gear shifting gear, and the left gear shifting gear and the right gear shifting gear are both rotatably arranged on the spline shaft through bearings. The gear shifting spline housing can be clamped between a gap formed by the left gear shifting gear and the spline shaft or between the right gear shifting gear and the spline shaft, and the gear shifting inner spline teeth and the gear shifting outer spline teeth of the gear shifting spline housing are simultaneously in spline connection, so that gear shifting is realized, and the gear shifting smoothness is ensured.

To sum up, owing to adopted above-mentioned technical scheme, the beneficial effects of the utility model are that: the axial direction of the declutch shift shaft is divided into a head section, a middle section and a tail section, the head end and the tail end of the declutch shift shaft are respectively and rotatably arranged on the gear box, two adjacent sections of the declutch shift shaft are respectively connected through a declutch shift arm, the three sections of the declutch shift shaft can make up the requirement of coaxiality between the two adjacent sections of the declutch shift shaft through installation and adjustment during installation, the coaxiality requirement of two bearing holes on the gear boxes at the two ends of the declutch shift shaft is correspondingly reduced, the processing difficulty and the processing cost of the declutch shift shaft are also reduced, and the assembly; the problem of jamming and unsmooth of the shifting fork shaft caused by the assembling precision is eliminated, and the phenomenon of repeated assembly and disassembly is avoided.

Drawings

The accompanying drawings, which form a part of the present application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 shows a schematic structural diagram of the prior art of the present invention.

Fig. 2 shows a cross-sectional view at a-a in fig. 1.

Fig. 3 shows the utility model discloses a shift fork structure of gear shifting gear box.

Fig. 4 shows a cross-sectional view at B-B in fig. 3.

Fig. 5 shows a perspective view of fig. 3.

Wherein the figures include the following reference numerals:

1, a shifting fork shaft; 11 a first section; 12, a middle section; 13, a tail section;

2, a shifting fork arm; 21 a second flange; 22 a fork body; 23, positioning holes; 24, a fork pin;

3, a shifting spline housing; 4, spline shafts; 5 a left shift gear; 6 a right shift gear; 7 a gear shifting arm; 8 bearing.

Detailed Description

It is noted that, unless otherwise indicated, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.

As shown in fig. 3 to 5, a shifting fork structure of a gear shifting gearbox comprises a shifting fork shaft 1, wherein the shifting fork shaft 1 is of a three-section type combined structure and is sequentially divided into a first section 11, a middle section 12 and a tail section 13 in the axial direction of the shifting fork shaft 1, and two adjacent sections of the shifting fork shaft 1 are connected through a shifting fork arm 2 and keep synchronous rotation.

Preferably, the shifting fork structure of the gear shifting gearbox comprises a shifting fork shaft 1 and two opposite shifting fork arms 2, wherein the shifting fork arms 2 are fixedly connected with the shifting fork shaft 1 in a synchronous rotating manner; the shifting fork shaft 1 is of a three-section combined structure and is sequentially divided into a first section 11, a middle section 12 and a tail section 13 in the axial direction of the shifting fork shaft 1; the shifting fork arm 2 fixedly connects two adjacent sections of the shifting fork shaft 1 together.

Preferably, the shifting fork arm 2 consists of a shifting fork main body 22 with a first flange plate and a second flange plate 21 which is detachably and fixedly connected with the first flange plate; the second flange 21 and the first flange of the shifting fork main body 22 are respectively matched and positioned with the corresponding sections of the shifting fork shaft 1 to form shaft holes.

Preferably, a positioning hole 23 is formed between the combination surfaces of the first flange plate and the second flange plate 21; a part of the positioning hole 23 is formed in the first flange and the other part is formed in the second flange 21 and extends radially inward from the outer edge of the flange.

Preferably, the second flange 21 and the first flange are detachably and fixedly connected by bolts and nuts.

Preferably, the shifting fork arm 2 is of a cantilever structure, and a shifting fork pin 24 is arranged at the free end of the shifting fork arm 2; shifting fork pin 24 clearance fit is in the ring channel of spline housing 3 of shifting, and spline housing 3 of shifting passes through the movably connection of spline fit structure on integral key shaft 4, and spline housing 3 of shifting can combine with the gear of shifting at both ends respectively through the external tooth.

Preferably, the gear shifting gears at the two ends are composed of a left gear shifting gear 5 and a right gear shifting gear 6, and the left gear shifting gear 5 and the right gear shifting gear 6 are both rotatably arranged on the spline shaft 4 through a bearing 8.

Specifically, integral key shaft 4 middle part is equipped with the external spline tooth and meshes with the spline housing 3 of shifting, and the both ends of the external spline tooth of integral key shaft 4 are connected with left gear shifting gear 5 and right gear shifting gear 6 respectively through the bearing connection, and left gear shifting gear 5 and right gear shifting gear 6 all are equipped with the internal spline tooth that can mesh with spline housing 3 of shifting.

As shown in fig. 3, a positioning hole 23 is formed in the connecting surface of the second flange 21 and the first flange of the shift fork main body 22, the positioning hole 23 is simultaneously located on the second flange 21 and the first flange, the positioning hole 23 is perpendicular to the axial direction of the shift fork shaft 1, and an elastic cylindrical pin can be placed in the positioning hole 23; to ensure that the phases of the two fork arms 2 fixed to the fork shaft 1 remain identical. Specifically, a notch is formed in the connecting position of the shifting fork shaft 1 and the shifting fork arm 2, and the shape of a middle hole formed in the shifting fork arm 2 is matched with the shape of the notch of the shifting fork shaft 1, so that during assembly, the shifting fork arm 2 and the shifting fork shaft 1 are clamped together firstly, and then the second flange plate 21 and the shifting fork main body 22 are fixedly connected; because the shifting fork arm 2 is connected with the shifting fork shaft 1 in a clamping and positioning mode, the shifting fork arm 7 can drive the shifting fork shaft 1 and the shifting fork arm 2 to synchronously rotate when rotating, and therefore the shifting spline sleeve 3 connected with the shifting fork arm 2 is driven to shift gears.

As shown in fig. 4, the left shift gear 5 and the right shift gear 6 are both sleeved on the spline shaft 4 through a bearing 8, and here the bearing 8 can be a deep groove ball bearing.

The scope of the present invention is defined not by the above-described embodiments but by the appended claims and equivalents thereof.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims (6)

1. A shifting fork structure of a gear shifting gearbox comprises a shifting fork shaft (1) and two opposite shifting fork arms (2), wherein the shifting fork arms (2) are fixedly connected with the shifting fork shaft (1) in a synchronous rotating manner; the shifting fork shaft (1) is of a three-section combined structure, and is sequentially divided into a first section (11), a middle section (12) and a tail section (13) in the axial direction of the shifting fork shaft (1); the shifting fork arm (2) fixedly connects two adjacent sections of the shifting fork shaft (1) together.

2. The fork structure of a gear shifting gearbox according to claim 1, wherein the fork arm (2) consists of a fork body (22) with a first flange and a second flange (21) detachably and fixedly connected with the first flange; the second flange plate (21) and the first flange plate of the shifting fork main body (22) are respectively matched and positioned with the corresponding sections of the shifting fork shaft (1) in a shaft hole forming mode.

3. The fork structure of a gear shift gearbox according to claim 2, wherein a positioning hole (23) is formed between the joint surfaces of the first flange plate and the second flange plate (21); a part of the positioning hole (23) is formed in the first flange, and the other part of the positioning hole is formed in the second flange (21) and extends radially inward from the outer edge of the flange.

4. Fork structure of a gear shift gearbox according to claim 2, characterised in that said second flange (21) and said first flange form a detachable fixed connection by means of bolts and nuts.

5. The fork structure of a gear shift gearbox according to claim 1, characterized in that the fork arm (2) is of a cantilever structure, and a fork pin (24) is arranged on the free end of the fork arm (2); shifting fork pin (24) clearance fit is in the ring channel of spline housing (3) of shifting, spline housing (3) of shifting passes through the movably connection of spline fit structure on integral key shaft (4), spline housing (3) of shifting can combine with the gear of shifting at both ends respectively through the external tooth.

6. Shifting fork structure of a gear shifting gearbox according to claim 5, characterized in that the gear shifting gears at both ends consist of a left gear shifting gear (5) and a right gear shifting gear (6), both the left gear shifting gear (5) and the right gear shifting gear (6) being rotatably arranged on the spline shaft (4) by means of bearings (8).

Images