CN212706504U

CN212706504U - Special tool for installing camshaft of diesel engine

Info

Publication number: CN212706504U
Application number: CN202021120140.XU
Authority: CN
Inventors: 王勇振; 尹建军; 庄磊
Original assignee: CSSC Marine Power Co Ltd
Current assignee: CSSC Marine Power Zhenjiang Co Ltd
Priority date: 2020-06-17
Filing date: 2020-06-17
Publication date: 2021-03-16
Anticipated expiration: 2030-06-17

Abstract

The utility model discloses a diesel engine camshaft installation specialized tool, including flange, support bracket, bush and a pair of backup pad, support bracket one end is the pipe, and its middle part is the circular arc groove of cutting into for following the earlier slope in pipe one end top to other end, the side of going up in circular arc groove is on a parallel with the pipe axis. The bush is the same shape as the support bracket and is embedded and fixed in the support bracket. The excircle of the bush and the inner hole of the round pipe, and the inner hole of the bush and the outer diameter of the camshaft are in clearance fit. A pair of supporting plates are vertically fixed on the lower side of the supporting bracket, and a connecting flange is vertically fixed on one end head of the supporting bracket. The utility model has the advantages of being simple in structure and easy and simple to handle, low in manufacturing cost has eliminated the hidden danger that camshaft and camshaft axle bush take place to rub the damage when the camshaft is packed into in the frame, has improved the assembly quality of camshaft, and then has improved marine medium speed diesel's assembly quality.

Description

Special tool for installing camshaft of diesel engine

Technical Field

The utility model relates to a mounting tool of diesel engine valve mechanism part especially relates to a mounting tool of marine medium speed diesel engine camshaft, belongs to the diesel engine and makes technical field.

Background

The marine medium-speed diesel engine is a diesel engine with the rotating speed ranging from 720 rpm to 1200 rpm, has the advantages of high efficiency and low oil consumption, and is widely used as a power device for various ships. The camshaft of the diesel engine (hereinafter referred to as camshaft) is an important part of the valve actuating mechanism of the diesel engine, and the performance of the medium-speed diesel engine for the ship is directly influenced by the quality of the installation of the camshaft. The camshaft 100 is shown in a perspective view in fig. 1, and has a first support plate 10 and a second support plate 20 respectively provided at both ends thereof, and 3 cams 30 of different phases in the middle. The diameters of the first support disc 10 and the second support disc 20 are larger than the maximum dimension of the middle 3 cam profiles 30, so that the camshaft 100 fits into the camshaft bore of the frame. At present, a crane is adopted to lift the camshaft and adjust the camshaft to a horizontal state, and then the camshaft is pushed into a hole of the rack through manpower or a guiding pushing tool. After the part of the camshaft 100 enters the camshaft hole of the frame, due to the instability of crane hoisting and manual propulsion, the part of the camshaft which is not installed is easy to rub against the bearing hole, thereby causing damage to the camshaft bush or the camshaft 100 and seriously affecting the installation quality of the marine medium-speed diesel engine.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a simple structure, low in manufacturing cost, simple to operate's diesel engine camshaft installation specialized tool to realize during the camshaft hole of the frame of packing into safely.

The utility model discloses a following technical scheme realizes:

a special tool for mounting a camshaft of a diesel engine comprises a connecting flange, a support bracket, a bushing and a pair of support plates, wherein one end of the support bracket is a circular tube, and the end head from the middle part to the other end of the support bracket is an arc groove which is formed by first inclining and then horizontally cutting the top of one end of the circular tube; the shape of the bush is the same as that of the support bracket, and the bush is embedded and fixed in the support bracket through a plurality of fastening screws; the excircle of the bush is in clearance fit with the inner hole of the circular tube, and the inner hole of the bush is in clearance fit with the outer diameter of the camshaft; a pair of supporting plates are vertically fixed on the lower side of the supporting bracket, and a connecting flange is vertically fixed on one end head of the supporting bracket.

The object of the invention is further achieved by the following technical measures.

Further, the ratio of the chord height H of the arc groove to the radius R of the circular tube is as follows: H/R = 0.85-0.87.

Furthermore, a plurality of lifting holes are formed in the supporting plate at intervals.

Furthermore, the clearance between the inner hole of the bush and the outer diameter of the camshaft is 0.18 mm-0.22 mm. The diameter D1 of the inner hole of the bush is smaller than the inner diameter D of the camshaft bearing bush arranged in the flywheel end of the frame, and D-D1 =0.18 mm-0.22 mm.

Furthermore, the lining is made of polytetrafluoroethylene.

The utility model has the advantages of being simple in structure and simple in operation, low in manufacturing cost, only need to fix flange outside the camshaft mounting hole of frame flywheel end, utilize the direction of the bush in the support bracket, just can be very conveniently put into the camshaft downthehole with the camshaft to make the camshaft both ends support respectively in the camshaft axle bush that corresponds, camshaft and camshaft axle bush take place to bump the hidden danger of wiping the damage when having eliminated the camshaft when packing into in the frame, the assembly quality of camshaft has been improved, and then the assembly quality of marine medium speed diesel engine has been improved.

The advantages and features of the invention will be illustrated and explained by the following non-restrictive description of preferred embodiments, which are given by way of example only with reference to the accompanying drawings.

Drawings

FIG. 1 is a perspective view of a camshaft;

fig. 2 is a front view of the present invention;

fig. 3 is an end view of the present invention mounted on a frame;

FIG. 4 is a top view of FIG. 2;

FIG. 5 is a perspective view of a camshaft installed in a camshaft mounting hole in the flywheel end of a frame.

Detailed Description

The present invention will be further explained with reference to the drawings and examples.

As shown in fig. 2-4, the utility model discloses a flange 1, support bracket 2, bush 3 and a pair of backup pad 4, the 2 left ends of support bracket are pipe 21, support bracket 2 middle part to support bracket 2 right-hand member end for the circular arc groove 22 that the earlier slope back horizontal dissection of follow pipe left end top becomes to support bracket 2. The ratio of the chord height H of the arc groove 22 to the radius R of the circular tube in this embodiment: H/R =0.86, which facilitates the placement of the camshaft 100 on the bushing 3 and facilitates the adjustment of the azimuth angle of the camshaft 100.

The bush 3 has the same shape as the support bracket 2 and is embedded and fixed in the support bracket 2 by 8 fastening screws 5. The outer circle of the bush 3 and the inner hole of the circular tube 21, and the inner hole of the bush 3 and the outer diameter of the camshaft 100 are in clearance fit, so that the bush 3 can be conveniently installed in the support bracket 2. A pair of backup pad 4 is welded and is fixed at support bracket 2 downside perpendicularly, is convenient for with the utility model discloses accomodate and place on the tool holder in the workshop. The interval is equipped with 3 jack-up holes 41 in backup pad 4, both is convenient for lift by crane the utility model discloses a weight can regard as the lightening hole again and alleviate the utility model. The connecting flange 1 is vertically welded and fixed on the end head of the left end of the support bracket 2, when the connecting flange 1 is fixed outside a cam shaft mounting hole at the flywheel end of the rack, the axis of the support bracket 2 can be ensured to be vertical to the cam shaft hole at the flywheel end of the rack, and the cam shaft 100 can be conveniently arranged in the cam shaft bearing bush 201.

The material of bush 3 is polytetrafluoroethylene, and in this embodiment, the clearance of bush 3 hole and camshaft 100 external diameter is 0.20mm, and the hole diameter D1 of bush 3 is less than the camshaft axle bush internal diameter D of installing in the frame flywheel end, and D-D1 =0.20mm, can avoid putting into camshaft 100 wherein and not damaged, also avoid damaging camshaft axle bush 201.

As shown in fig. 5, the process of assembling the camshaft 100 into the camshaft bearing bush 201 at the flywheel end of the frame 200 is as follows:

the bush 3 is first installed in the support bracket 2, and the bush 3 is fixed by being embedded in the support bracket 2 by 8 fastening screws 5. Then will the utility model discloses the flange 1 of one end is fixed in the camshaft mounting hole outside of frame 200 flywheel end through 4 screws. Then, the inner side surface of the bush 3 is cleaned, and lubricating oil is filled into the inner side surface of the bush 3 to ensure that the camshaft 100 can slide on the inner side surface of the bush 3. The camshaft 100 is then lifted and the second support disc 20 is carefully placed in the bush 3 at one end of the camshaft 100. The camshaft 100 is then pushed slowly toward the camshaft bearing 201. Ensuring that the camshaft 100 is coaxial with the center of the camshaft bearing bush 201, and finally slowly pushing the first support disc 10 at the other end of the camshaft 100 into the camshaft bearing bush 201 to complete the installation of the camshaft 100.

In addition to the above embodiments, the present invention may have other embodiments. All the technical solutions adopting equivalent substitution or equivalent transformation fall within the protection scope claimed by the present invention.

Claims

1. A special tool for mounting a camshaft of a diesel engine is characterized by comprising a connecting flange, a support bracket, a bushing and a pair of support plates, wherein one end of the support bracket is a circular tube, and the end head from the middle part to the other end of the support bracket is an arc groove which is formed by firstly inclining and then horizontally cutting the top of one end of the circular tube; the shape of the bush is the same as that of the support bracket, and the bush is embedded and fixed in the support bracket through a plurality of fastening screws; the excircle of the bush is in clearance fit with the inner hole of the circular tube, and the inner hole of the bush is in clearance fit with the outer diameter of the camshaft; a pair of supporting plates are vertically fixed on the lower side of the supporting bracket, and a connecting flange is vertically fixed on one end head of the supporting bracket.

2. The special tool for installing the camshaft of the diesel engine according to claim 1, wherein the ratio of the chord height H of the arc groove to the radius R of the circular tube is as follows: H/R = 0.85-0.87.

3. The special tool for installing the camshaft of the diesel engine as claimed in claim 1, wherein a plurality of lifting holes are formed in the supporting plate at intervals.

4. The special tool for mounting the camshaft of the diesel engine as claimed in claim 1, wherein the clearance between the inner hole of the bush and the outer diameter of the camshaft is 0.18mm to 0.22 mm.

5. The special tool for mounting the camshaft of the diesel engine as claimed in claim 1, wherein the inner hole diameter D1 of the bushing is smaller than the inner diameter D of the camshaft bush mounted in the flywheel end of the frame, and D-D1 =0.18 mm-0.22 mm.

6. The special tool for installing the camshaft of the diesel engine as claimed in claim 1, wherein the material of the bushing is teflon.