CN111520455A - Assembled idler gear assembly - Google Patents

Abstract

The invention discloses an assembled idle gear assembly which comprises a large gear, a small gear and a spring expansion pin. The gear wheel comprises a plurality of inner flanges which protrude from a gear ring of the gear wheel to the center direction of the gear wheel; screw holes arranged on each inner flange; and a first positioning pin hole arranged at one end of one of the screw holes. One end of the pinion is provided with a small gear ring, and the pinion comprises a plurality of external flanges which protrude outwards along the other end of the pinion; a step through hole provided on each outer flange; and a second positioning pin hole arranged at one end of one of the step through holes. And the spring expansion pins are arranged in the first positioning pin hole and the second positioning pin hole. The inner flanges and the screw holes are matched with the outer flanges and the step through holes in position and quantity, and the large gear is arranged between the small gear ring and the outer flanges through the step through holes and the screw holes by screws. The assembled idle gear assembly is simple to assemble and convenient to maintain, and can avoid the failure problem of a hot sleeve assembling mode.

Description

Assembled idler gear assembly

Technical Field

The invention relates to the field of machine manufacturing, in particular to an assembled idle gear assembly of a diesel engine.

Background

At present, an idle gear component of a diesel engine (a large gear and a small gear are combined together after being processed separately), and the large gear and the small gear are assembled by interference fit (a shrink fit assembly process) to transmit torque. Although the assembly process of the prior art hot-fitting structure is simple, the joint area of the inner bore surface of the mating part and the mating section of the shaft surface cannot be made large due to the structural and dimensional limitations, and the heating temperature during hot-fitting is limited due to the influence of materials and heat treatment, and the sufficient hardness of the part is ensured. In addition, the roughness of the mating section of the surface of the hole and the surface of the shaft in the mating part fluctuates, which affects the bonding strength of the two, and thus failure problems occur.

To remedy these shortcomings, an additional, more reliable construction is required, and this is the technical problem addressed by the present application, namely to create a fabricated idler gear assembly for applications where structural and dimensional constraints do not further increase the mating area (bore surface and shaft surface) of the mating segments of the mating parts.

The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.

Disclosure of Invention

The invention aims to provide an assembled idle gear component which can meet the assembly strength and precision requirements of the component without a hot assembly process.

To achieve the above objects, the present invention provides an assembled idler gear assembly including a bull gear, a pinion gear, and a spring expansion pin. The gear wheel comprises a plurality of inner flanges which protrude from a gear ring of the gear wheel to the center direction of the gear wheel; screw holes arranged on each inner flange; and a first positioning pin hole arranged at one end of one of the screw holes. One end of the pinion is provided with a small gear ring, and the pinion comprises a plurality of external flanges which protrude outwards along the other end of the pinion; a step through hole provided on each outer flange; and a second positioning pin hole arranged at one end of one of the step through holes. And the spring expansion pins are arranged in the first positioning pin hole and the second positioning pin hole. The inner flanges and the screw holes are matched with the outer flanges and the step through holes in position and quantity, and the large gear is arranged between the small gear ring and the outer flanges through the step through holes and the screw holes by screws.

In a preferred embodiment, the top of each inner flange facing the circle center of the gearwheel is a section of cylindrical cambered surface, and the plurality of sections of cylindrical cambered surfaces form a discontinuous cylindrical radial positioning hole with the same axis as the gearwheel.

In a preferred embodiment, the gearwheel further comprises a circular arc space between the two inner flanges, the circular arc space projecting away from the centre of the gearwheel.

In a preferred embodiment, the outer circumferential surface of the connecting section between the small gear ring of the small gear and the outer flange forms a radial positioning shaft, and the radial positioning shaft is matched with the radial positioning hole of the large gear.

In a preferred embodiment, the pinion gear further comprises a central through hole, which is coaxial with the pinion gear.

In a preferred embodiment, the fabricated idler gear assembly further includes a bushing disposed within the central through bore of the pinion gear.

In a preferred embodiment, the spring expansion pin includes a disassembly tooling hole and a chamfer. The central line of the disassembly process hole is vertical to the central line of the spring expansion pin and penetrates through the spring expansion pin; the chamfer is arranged at one end of the spring expansion pin, which is far away from the disassembly technical hole.

Compared with the prior art, the assembled idle gear assembly has the advantages that the large gear and the small gear are connected through the inner flange and the outer flange which are matched with each other, the spring expansion pin, the radial positioning shaft and the radial positioning hole are used for positioning, and the assembly strength and precision requirements of the assembly can be met without adopting a hot-assembling process.

Drawings

FIG. 1 is a schematic top cross-sectional view of a fabricated idler gear assembly according to an embodiment of the present invention;

FIG. 2 is a schematic front view of a fabricated idler gear assembly according to an embodiment of the present disclosure;

FIG. 3 is a left side schematic view of a fabricated idler gear assembly according to an embodiment of the present invention;

FIG. 4 is a rear schematic view of a fabricated idler gear assembly according to an embodiment of the present disclosure;

fig. 5 is a partially enlarged schematic view at I of fig. 1.

FIG. 6 is a schematic front view of a bull gear according to one embodiment of the present invention;

FIG. 7 is a left side cross sectional schematic view of a bull gear according to one embodiment of the present invention;

FIG. 8 is a schematic top view of a bull gear according to an embodiment of the present invention;

FIG. 9 is a schematic bottom view of a bull gear according to one embodiment of the present invention;

FIG. 10 is a schematic front view of a spring expansion pin according to an embodiment of the present invention;

FIG. 11 is a left side schematic view of a spring expansion pin according to an embodiment of the present invention;

FIG. 12 is a schematic top view of a spring expansion pin according to an embodiment of the present invention;

FIG. 13 is a schematic cross-sectional view taken at D-D of FIG. 11;

FIG. 14 is a front schematic view of a pinion gear according to an embodiment of the present invention;

FIG. 15 is a left side schematic view of a pinion gear according to an embodiment of the present invention;

FIG. 16 is a left side cross-sectional schematic view of a pinion gear according to an embodiment of the present invention;

FIG. 17 is a schematic top view of a pinion gear according to an embodiment of the present invention;

FIG. 18 is a schematic sectional top view of a pinion gear according to an embodiment of the present invention;

FIG. 20 is a schematic front view of a bushing according to an embodiment of the invention;

FIG. 21 is a left side cross-sectional schematic view of a bushing according to an embodiment of the invention.

FIG. 19 is a schematic cross-sectional view at G-G of FIG. 15;

description of the main reference numerals:

1-big gear, 1.1-inner flange, 1.2-screw hole, 1.3-first positioning pin hole, 1.4-radial positioning hole, 1.5-arc evacuation part, 2-spring expansion pin, 2.1-disassembly process hole, 2.2-chamfer, 2.3-opening, 3-small gear, 3.1-outer flange, 3.2-step through hole, 3.3-second positioning pin hole, 3.4-radial positioning shaft, 3.5-center through hole, 4-bush and 5-screw.

Detailed Description

The following detailed description of the present invention is provided in conjunction with the accompanying drawings, but it should be understood that the scope of the present invention is not limited to the specific embodiments.

Throughout the specification and claims, unless explicitly stated otherwise, the word "comprise", or variations such as "comprises" or "comprising", will be understood to imply the inclusion of a stated element or component but not the exclusion of any other element or component.

As shown in fig. 1 to 5, an assembled idle gear assembly according to a preferred embodiment of the present invention mainly includes a large gear 1, a spring expansion pin 2, a small gear 3, a bushing 4, and a screw 5 (a hexagon socket head cap screw 5M8X25, which is optional in this embodiment, but the present invention is not limited thereto).

As shown in fig. 6 to 9, in some embodiments, the gearwheel 1 comprises a plurality of inner flanges 1.1 protruding from the rim of the gearwheel 1 towards the centre thereof. A screw hole 1.2 provided on each inner flange 1.1. And a first positioning pin hole 1.3 arranged at one end of one of the screw holes 1.2.

In some embodiments, the top of each inner flange 1.1 facing the center of the bull gear 1 is a cylindrical arc surface, and the multiple cylindrical arc surfaces form a discontinuous cylindrical radial positioning hole 1.4 with the same axis, and the radial positioning hole 1.4 is coaxial with the bull gear 1.

In some embodiments, the gearwheel 1 further comprises a circular arc relief 1.5 arranged between the two inner flanges 1.1, the circular arc relief 1.5 protruding towards the centre of the gearwheel 1, the circular arc relief 1.5 being arranged so as to give way to the outer flange 3.1 of the pinion 3 during assembly. The number of the inner flanges 1.1 and the number of the arc-shaped clearance parts 1.5 are only six, but the invention is not limited thereto.

As shown in fig. 10-13, in some embodiments, the spring expansion pin 2 includes a disassembly tooling hole 2.1, a chamfer 2.2, and an opening 2.3. The central line of the disassembly technical hole 2.1 is vertical to the central line of the spring expansion pin 2 and penetrates through the spring expansion pin 2. The chamfer 2.2 is arranged at one end of the spring expansion pin 2 far away from the disassembly technical hole 2.1. The spring expansion pin 2 of the embodiment can adopt a universal piece, and only a disassembly fabrication hole 2.1 is processed in the radial direction of the upper side for disassembly. The chamfer 2.2 is provided to facilitate the insertion guidance of the spring expansion pin 2.

As shown in fig. 14 to 18, in some embodiments, the pinion 3 is provided with a small ring gear at one end, the pinion 3 comprising a plurality of external flanges 3.1 projecting outwards along the other end of the pinion 3; a stepped through bore 2.2 is provided in each outer flange 3.1. And a second dowel hole 3.3 provided at one end of one of the stepped through holes 2.2. And the spring expansion pin 2 is arranged in the first positioning pin hole 1.3 and the second positioning pin hole 3.3. Wherein the positions and the quantity of the plurality of inner flanges 1.1 and the plurality of screw holes 1.2 and the plurality of outer flanges 3.1 and the plurality of step through holes 2.2 are matched, and the large gear 1 is arranged between the small gear ring and the plurality of outer flanges 3.1 by screws 5 through the step through holes 2.2 and the screw holes 1.2.

In some embodiments, a relief is also provided between the outer flanges 3.1 of the pinion 3 in order to give way to the inner flanges 1.1 of the gearwheel 1 when assembled.

In some embodiments, the outer circumferential surface of the connection section between the small toothing of the small gearwheel 3 and the outer flange 3.1 forms a radial positioning shaft 3.4, which radial positioning shaft 3.4 cooperates with a radial positioning hole 1.4 of the large gearwheel 1.

In some embodiments, the pinion 3 is the basic assembly, and the central axial portion is provided with a cylindrical central through hole 3.5 for mounting the bush 4 as a bearing of the kinematic pair. Please refer to fig. 19 to 21.

Referring again to fig. 5, in some embodiments, the first positioning pin hole 1.3 of the large gear 1 is a step hole extending from an end of the mounting surface of the screw hole 1.2 of the inner flange 1.1. Similarly, the second positioning pin hole 3.3 on the pinion 3 is formed by expanding at one end of the mounting surface of the step through hole 2.2 of one outer flange 3.1. The sum of the lengths of the first positioning pin hole 1.3 and the second positioning pin hole 3.3 is slightly larger than the length of the spring expansion pin 2, so that the spring expansion pin 2 does not interfere with the mounting surface of the inner flange 1.1 of the large gear 1 and the mounting surface of the outer flange 3.1 of the small gear 3 during assembly. Furthermore, the diameter of the central hole of the spring expansion pin 2 should be able to fit through the screw 5.

In some embodiments, the method of assembling the fabricated idler gear assembly of the present invention is as follows:

during assembly, firstly, the arc space avoiding part 1.5 of the big gear 1 is aligned to the outer flange 3.1 of the small gear 3, and the radial positioning hole 1.4 of the big gear 1 is sleeved on the radial positioning shaft 3.4 of the small gear 3. The gearwheel 1 is rotated such that all the screw holes 1.2 are aligned with all the stepped through holes 2.2, wherein the first positioning pin hole 1.3 has to be aligned with the second positioning pin hole 3.3. The spring expansion pin 2 is firstly inserted into the second positioning pin hole 3.3, and then is continuously inserted into the first positioning pin hole 1.3. Finally, six screws 5 are screwed into the screw holes 1.2 and are tightly screwed to finish assembly.

When in disassembly, the screw 5 penetrating through the spring expansion pin 2 is firstly disassembled, then a special tool is used for penetrating into the spring expansion pin 2 to hook the disassembly process holes 2.1 at two sides to pull out the spring expansion pin 2, then the rest screws 5 are disassembled, and finally the bull gear 1 is rotated to enable the circular arc space avoiding part 1.5 to be aligned with the outer flange 3.1 of the pinion gear 3 to pull out the bull gear 1, so that the disassembly can be completed.

In summary, the assembled idle gear assembly provided by the invention has the advantages that the large gear and the small gear are connected by the inner flange and the outer flange which are matched with each other, the spring expansion pin, the radial positioning shaft and the radial positioning hole are used for positioning, and the assembly strength and precision requirements of the assembly can be met without adopting a hot-assembling process. Meanwhile, the assembly process is simple, the maintenance is convenient, and the failure problem of the hot jacket assembly mode is avoided.

The foregoing descriptions of specific exemplary embodiments of the present invention have been presented for purposes of illustration and description. It is not intended to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain certain principles of the invention and its practical application to enable one skilled in the art to make and use various exemplary embodiments of the invention and various alternatives and modifications as are suited to the particular use contemplated. It is intended that the scope of the invention be defined by the claims and their equivalents.

Claims (7)

1. An assembled idler gear assembly, comprising:

a bull gear, comprising:

a plurality of inner flanges protruding from the ring gear of the large gear toward the center thereof;

a plurality of screw holes, each of which is disposed on one of the inner flanges; and

a first positioning pin hole provided at one end of one of the plurality of screw holes; a pinion gear provided with a small ring gear at one end thereof, the pinion gear comprising:

a plurality of outer flanges protruding outward along the other end of the pinion gear;

a plurality of stepped through holes, each of the stepped through holes being provided on one of the outer flanges; and

a second dowel hole disposed at one end of one of the plurality of stepped through holes; and a spring expansion pin disposed in the first and second dowel holes; wherein the quantity of a plurality of interior flanges with a plurality of outer flanges is the same, and pass through with the screw the step through-hole with the screw will the gear wheel is installed between the ring gear and a plurality of outer flanges.

2. The assembly idler gear assembly of claim 1 wherein a top portion of each of said inner flanges facing a center of said bull gear is a cylindrical arcuate surface, and a plurality of said cylindrical arcuate surfaces are concentric to form a discrete cylindrical radial locating hole, said radial locating hole being concentric with said bull gear.

3. The fabricated idler gear assembly of claim 1 wherein said bull gear further includes an arcuate relief disposed between two of said inner flanges, said arcuate relief projecting away from a center of said bull gear.

4. The assembly type idler gear assembly as claimed in claim 2, wherein an outer circumferential surface of a connecting section between said ring gear of said pinion gear and said outer flange forms a radially positioned shaft, said radially positioned shaft being engaged with said radially positioned hole of said bull gear.

5. The fabricated idler gear assembly of claim 1 wherein said pinion gear further includes a central throughbore that is coaxial with said pinion gear.

6. The fabricated idler gear assembly of claim 5 further comprising a bushing disposed within said central through bore of said pinion gear.

7. The fabricated idler gear assembly of claim 1, wherein said spring expansion pin comprises:

disassembling the fabrication hole, wherein the central line of the fabrication hole is perpendicular to the central line of the spring expansion pin and penetrates through the spring expansion pin; and

and the chamfer is arranged at one end of the spring expansion pin, which is far away from the disassembly technical hole.

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