Reamer for flywheel

Abstract

The utility model discloses a reamer for a flywheel, which is used for reaming a connecting hole of the flywheel and a crankshaft, is fastened by a fitting bolt after reaming, and comprises a cylindrical head reamer and a cylindrical second reamer, and the outer diameter of the second reamer is larger than the outer diameter of the head reamer and is close to the outer diameter of the fitting bolt. The head reamer comprises a head reamer body with four head blades, a radial grain surface distributed in the axial direction is arranged at the position, a certain distance away from the head end face, of the head end of the head reamer body, a first connecting terminal is arranged at the tail end of the head reamer body, and the head blades are arranged in the circumferential direction of the head reamer body in a rotating mode. The two reamers comprise two reamer bodies with eight two cutting edges, the two cutting edges are arranged in the axial direction of the two reamer bodies, the two reamer bodies are provided with cutting faces extending from the head end face to the tail end face along one side of any one of the two cutting edges, and the tail ends of the two reamer bodies are provided with second connecting terminals. The connecting tightness of the crankshaft and the flywheel is improved by adopting head reaming rough machining and matching with two-reaming finish machining.

Description

Technical Field

[0001] The utility model belongs to the technical field of drilling reamer, in particular to a flywheel reamer. Background Art

[0002] The flywheel is a disc-shaped part with a large moment of inertia, and it acts as an energy storage device. The crankshaft receives the force from the connecting rod and converts it into torque, which is output through the crankshaft and drives other accessories on the engine. The connection between the flywheel and the crankshaft is usually achieved through a connecting hole and a tight-fitting bolt therein. The connection between the crankshaft and the flywheel must be close to each other without any gap. If they are tightly connected, they will not shake during high-speed operation. The current common practice is to form the hole by reaming at one time, which has the problem of not being tightly connected and easy to shake. Utility Model Content

[0003] In view of this, the purpose of the utility model is to provide a flywheel reamer to solve the deficiencies in the prior art.

[0004] In order to achieve the above object, the utility model is implemented by the following technical solutions:

[0005] A reamer for a flywheel is provided, which is used for reaming a connecting hole between a flywheel and a crankshaft. After reaming, the hole is tightened with a fitting bolt. The reamer comprises a cylindrical head reamer and a second reamer. The outer diameter of the second reamer is larger than the outer diameter of the head reamer and close to the outer diameter of the fitting bolt. The head reamer comprises a head cutter body having four head blades. The head end of the head cutter body is provided with a radial surface distributed along the axial direction at a certain distance from the head end face. The tail end of the head cutter body is provided with a first connecting terminal. The head blades are arranged circumferentially around the head cutter body. The second reamer comprises a second cutter body having eight second blades. The second blades are arranged along the axial direction of the second cutter body. The second cutter body is provided with a cutting surface extending from the head end face to the tail end face along one side of any of the second blades. The tail end of the second cutter body is provided with a second connecting terminal.

[0006] For example, in the flywheel reamer, first retaining groove rings are provided at both ends of the radial texture surface.

[0007] For example, in the flywheel reamer, a second groove ring is arranged at a certain distance from the head end surface of the second tool body.

[0008] For example, in the flywheel reamer, the axial length of the radial groove surface is close to the axial length of the front end of the radial groove surface from the head end surface of the head cutter body.

[0009] For example, in the flywheel reamer, the main body outer diameter of the first reamer is 21.6 mm, and the main body outer diameter of the second reamer is 22 mm.

[0010] The beneficial effects of the technical solution of the utility model are:

[0011] The first reaming rough machining is adopted, and the second reaming fine machining is combined to improve the connection tightness between the crankshaft and the flywheel. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] To further illustrate the above-mentioned purpose, structural features and effects of the present invention, the present invention will be described in detail below with reference to the accompanying drawings.

[0013] Figure 1 This is a schematic diagram of the structure of a head reamer in a preferred embodiment of the utility model;

[0014] Figure 2 This is a schematic diagram of the reamer structure of the second preferred embodiment of the utility model;

[0015] Figure 3 This is a schematic diagram of the tight-fitting bolt structure of a preferred embodiment of the utility model;

[0016] In the figure: 0, tight-fitting bolt; 1, first blade; 2, first blade body; 3, radial groove surface; 4, first connecting terminal; 5, second blade; 6, second blade body; 7, cutting surface; 8, second connecting terminal; 9, first groove ring; 10, second groove ring. DETAILED DESCRIPTION

[0017] The terms "utility model" and "the present utility model" used in this specification are intended to refer broadly to all subject matter of this specification and any patent claims below. Statements containing these terms should not be understood to limit the subject matter described herein or to limit the meaning or scope of any patent claim below. In addition, this specification does not attempt to describe or limit the subject matter covered by any claim of any specific component, paragraph, statement or figure of this application. The subject matter should be understood with reference to the entire specification, all drawings and any claims below. The present utility model may have other embodiments and be practiced or implemented in other ways. Moreover, it should be understood that the wording and terminology used herein are for illustrative purposes and should not be considered as limiting.

[0018] The details of the present invention will now be discussed with reference to the accompanying drawings which illustrate the present invention by way of example only. In the accompanying drawings, similar features or components may be marked with the same reference numerals.

[0019] The use of "including", "having" and "comprising" and variations thereof herein is meant to include the items listed thereafter and their equivalents and additional items. Although reference may be made to directions such as above, below, upward, downward, backward, bottom, top, front, back, etc. in describing the drawings, for convenience, reference is made relative to the drawings. These directions are not intended to literally accept or limit the present invention in any form. In addition, terms such as "first", "second", "third", etc. are used herein for illustrative purposes and are not intended to indicate or imply importance or significance.

[0020] See also Figure 1 , Figure 2 , Figure 3 As shown, the flywheel reamer of the utility model is used for reaming the connection hole between the flywheel and the crankshaft. After reaming, it is fastened with a tight-fitting bolt 0. Specifically, it includes a cylindrical head reamer and a second reamer. The outer diameter of the second reamer is larger than the outer diameter of the head reamer and close to the outer diameter of the tight-fitting bolt 0. The head reamer includes a head cutter body 2 with four head blades 1, specifically a high-speed steel M2 four-blade reamer. The head end of the head cutter body 2 is arranged with a radial surface 3 distributed along the axial direction at a certain distance from the head end face. The tail end of the head cutter body 2 is provided with a first connecting terminal 4. The head blade 1 is arranged circumferentially around the head cutter body 2. The second reamer includes a second cutter body 6 with eight second blades 5, a high-speed steel M2 eight-blade reamer. The second blades 5 are arranged along the axial direction of the second cutter body 6. The second cutter body 6 is provided with a cutting surface 7 extending from the head end face to the tail end face along one side of any second blade 5. The tail end of the second cutter body 6 is provided with a second connecting terminal 8.

[0021] Furthermore, first retaining groove rings 9 are provided at both ends of the radial pattern surface 3, and second retaining groove rings 10 are arranged at a certain distance from the head end surface of the second blade body 7.

[0022] The first blade body 2 and the second blade body 6 are respectively connected to the pneumatic wrench through the first connecting terminal 4 and the second connecting terminal 9. Generally, 7kg of compressed air is used to drive the pneumatic wrench and the hole is reamed at a constant speed.

[0023] The axial length of the radial surface 3 is close to the axial length of the front end of the radial surface 3 from the head end face of the head cutter body 2, and the length difference is 4-5 mm.

[0024] Preferably, the main body outer diameter of the first reamer is 21.6 mm and the length is 215 mm, and the main body outer diameter of the second reamer is 22 mm and the length is 180 mm.

[0025] When reaming holes, the first reaming is just rough machining to make the processed hole diameter close to the tight fitting bolts, and the second reaming is fine machining to remove excess burrs. After the first and second reaming, the flywheel and the crankshaft are fixed with tight fitting bolts. The reamer diameter tolerance directly affects the dimensional accuracy of the processed hole. When reaming holes, cutting fluid is used irregularly due to the radial runout of the cutter teeth and the amount of reaming.

[0026] The above are only preferred embodiments of the present invention, and do not limit the implementation mode and protection scope of the present invention. Those skilled in the art should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the description and illustrations of the present invention should be included in the protection scope of the present invention.

Claims

1. A flywheel reamer is used for reaming the connection hole between the flywheel and the crankshaft, and after the reaming is completed, a tight-fitting bolt is used to tighten the hole, characterized in that: It comprises a cylindrical head reamer and a second reamer, wherein the outer diameter of the second reamer is larger than the outer diameter of the head reamer and close to the outer diameter of the tight-fitting bolt, wherein the head reamer comprises a head cutter body having four head blades, wherein the head end of the head cutter body is provided with a radial surface distributed along the axial direction at a certain distance from the head end face, wherein the tail end of the head cutter body is provided with a first connecting terminal, wherein the head blades are arranged circumferentially around the head cutter body; wherein the second reamer comprises a second cutter body having eight second blades, wherein the second blades are arranged axially of the second cutter body, wherein a cutting surface extending from the head end face to the tail end face is arranged on one side of any of the second blades, wherein the tail end of the second cutter body is provided with a second connecting terminal.

2. The flywheel reamer according to claim 1, characterized in that: Both ends of the radial pattern surface are provided with a first clamping groove ring.

3. The flywheel reamer according to claim 1, characterized in that: A second clamping groove ring is arranged at a certain distance from the head end surface of the head end of the second blade body.

4. The flywheel reamer according to claim 1, characterized in that: The axial length of the radial surface is close to the axial length of the front end of the radial surface from the head end surface of the head cutter body.

5. The flywheel reamer according to claim 1, characterized in that: The main body outer diameter of the first reamer is 21.6 mm, and the main body outer diameter of the second reamer is 22 mm.

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