JP2000158322A - Bore grinder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bore grinder with a simple constitution and easy handling which can be mounted on an engine directly prior to the removing of a piston and the honing of a cylinder liner and grind a liner in the job site. SOLUTION: A bore grinder 1 is composed of a main body shaft 6 abutting on the inner surface of a bore to be ground, provided rollable two or more abutting rollers 11 to an equal radius position and positioned for the inner surface of the bore, a grinding wheel 13 for grinding held from the main body shaft 6 to the above radius position between the abutting rollers 11 and a reaction roller held on the main body shaft 6 and capable of resiliently abutting on the inner surface of the bore rollably in order to act the reaction to the grinding wheel 13 direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bore grinding machine for grinding a cylinder liner of a large engine such as a ship, and more particularly, to a bore grinding machine which is mounted directly on a cylinder portion of an engine prior to removal of a piston or honing of a cylinder liner. The present invention relates to a bore grinder that is easy to handle with a simple configuration that enables liner bore grinding.

[0002]

2. Description of the Related Art Overhaul of a large engine requires disassembly and removal of a cylinder portion and bore processing of a cylinder liner by means of grinding and honing equipment. Therefore, in order to remove a cylinder head and remove a piston, It required manual work to grind off carbon seized on the wear edge with a grinder. It is necessary to perform the carbon removal work in a state where the upper body of the worker is turned upside down in the cylinder bore, and this is mechanized,
A direct-mount grinding machine for round grinding the liner bore was awaited.

[0003]

However, the direct mount type grinding machine needs to be mounted on the cylinder block in order to position it in line with the original center of the unevenly worn liner bore. The mechanism must be very complicated, and careful adjustment is required.

SUMMARY OF THE INVENTION An object of the present invention is to provide a bore grinder which has a simple structure which can be directly mounted on an engine prior to removal of a piston or honing of a cylinder liner and which can perform liner grinding on site, and which is easy to handle. is there.

[0005]

In order to solve the above-mentioned problems, two or more abutment rollers which can be rolled in contact with the inner surface of a bore to be ground are provided at equal radial positions, and the inner surface of the bore is to be grounded. A main body shaft that can be positioned, a grinding wheel that is held at the radial position from the main body shaft between the contact rollers and grinds, and a rolling wheel that is held by the main body shaft and exerts a reaction force in the direction of the grinding wheel The bore grinder is composed of a reaction roller that can resiliently contact the inner surface of the bore as much as possible.

[0006] The contact roller and the grinding wheel forming a predetermined radius position form a predetermined curvature surface centered on the main body axis. The pressing roller is pressed against the inner surface of the bore by the reaction force roller and moved in the circumferential direction. In addition, the unevenly worn inner surface of the bore can be ground to a predetermined curvature.

[0007] The grinding wheel and the reaction force roller are divided into six equal parts.
By arranging the main body shaft at a position close to the original center position of the bore by arranging the four abutment rollers at the other dividing positions by arranging the main body shaft at the other dividing position, uneven wear The liner inner surface can be ground with high accuracy by a simple configuration. By connecting to the main body shaft via a universal joint and providing a screw-type drive shaft for operating rotation and feed, regardless of the installation accuracy of the drive shaft, the rotation of the main body shaft via the drive shaft Feeding operation becomes possible. By controlling the driving of the grinding wheel in accordance with the turning power of the main shaft, when the turning power of the main shaft is small, the driving of the grinding wheel is stopped, thereby preventing unnecessary grinding of the inner surface of the cylinder. be able to. Since the body shaft is provided with a bore gauge plate that forms a disk circumscribing the contact roller, the mounting position of the contact roller can be determined with high accuracy by a bore gauge plate having a simple configuration.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the technical idea which constitutes the above-mentioned solution will be described below. FIG. 1 is a side view showing the configuration of the bore grinding machine of the present invention. Bore grinding machine 1
It comprises a handle shaft 4 rotatably supported on a gantry 3 having yokes 2, 2 and a main body shaft 6 connected to the handle shaft 4 via a universal joint 5.

The handle shaft 4 is screwed to the gantry 3 and provided with a handle arm 7 with a grip at the upper end, and is rotated in the axial direction by the rotation thereof. The handle shaft 4 includes an upper joint 8, a swivel joint 9 for receiving compressed air for power, and a valve unit 10 for controlling the supply of compressed air in accordance with the torque of the handle shaft 4. This valve part 10
Controls the driving of a grinder described below.

The main body shaft 6 includes a roller shaft 12 having contact rollers 11 attached to the inner surface of the bore and capable of rolling in the circumferential direction at upper and lower ends, a grinder 13 made of a rotary grindstone driven by an air motor, and the like. A disk-shaped bore gauge 14 is attached to the lower end in a radial manner to form a grinding unit. In this grinding section, the yokes 2 and 2 are attached to studs B erected on a cylinder block A, and are suspended so as to reach the inner surface of the bore of the cylinder liner C.

FIG. 2 is a sectional view taken along the line II-II of FIG. The grinder 13 and the reaction roller 17 are arranged on one diameter line, and the plurality of contact rollers 11 are radially arranged. Radially provided at six equally divided positions.

The grinder 13 is provided with a driving air motor therein so that a grindstone for a carbon remover or the like can be exchanged. The grinder 13 can be vertically adjusted at the end of a penetrating shaft 15 penetrating the main body shaft in the radial direction. A radial position adjustment and a rotation angle position adjustment are provided on the shaft 15. The penetrating shaft 15 has a spring 16 for adjusting its access and an adjustment knob (not shown).

The bore gauge 14 is a disk having its outer periphery mounted close to the contact roller 11 and having a reference diameter at the position of the contact roller 11. The bore gauge 14 contacts the predetermined dimension position with high precision based on the contact position. The radial position of the contact roller 11 can be determined. The reaction force roller 17 is formed of a roller which can roll while pressing the inner surface of the bore with a through shaft (not shown) by a spring at a position opposite to the grinder 13.

In the bore grinding machine 1 having the above-described configuration, the yokes 2 and 2 are attached to the studs B erected on the cylinder block A, and are suspended so as to face the inner surface of the bore of the cylinder liner C. By setting the contact roller 11 at the bore radius position, the main body shaft 6 is positioned at a position approximate to the original bore center position, and the main body connected via the universal joint 5 according to the turning operation of the handle arm 7. The shaft 6 is fed along with the rotation, and the unevenly worn inner surface of the liner can be ground with high accuracy by a simple configuration without being affected by the position where the handle shaft 4 is erected.

Therefore, the bore grinder according to the present invention is simple to handle and removes carbon seizure on the wear edge required for removing the piston by simple and high-precision grinding, and also performs round grinding of the unevenly worn liner bore. Therefore, it is possible to contribute to the improvement of the working environment and efficiency of the overhaul of the engine and the improvement of the processing quality.

[0016]

The bore grinding machine of the present invention has the following effects. The abutment roller and the grinding wheel forming a predetermined radius position form a predetermined curvature surface centered on the main body axis, and this is pressed against the inner surface of the bore by the reaction force roller, and then rotated in the circumferential direction. The worn bore inner surface can be ground to a predetermined curvature surface.

At this time, the position of the main body shaft is determined in accordance with the position and number of the abutting rollers, and the position of the main body shaft is positioned close to the original bore center while suppressing the influence of dimensional errors due to uneven wear. The simple structure without the need for complicated mechanisms makes it easy to handle, regardless of the mounting position, including the removal of carbon sticking to the wear edge, and the roundness of the unevenly worn liner bore. Grinding becomes possible.

Therefore, the bore grinder according to the present invention is simple in handling and can remove carbon stuck to a wear edge required for extracting a piston by simple and high-precision grinding, as well as round grinding of an unevenly worn liner bore. Therefore, it is possible to contribute to the improvement of the working environment and efficiency of the overhaul of the engine and the improvement of the processing quality.

[Brief description of the drawings]

FIG. 1 is a side view showing a configuration of a bore grinding machine according to the present invention.

FIG. 2 is a sectional view taken along line II-II of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Bore grinding machine 4 Handle shaft 5 Universal joint 6 Body shaft 10 Valve part 11 Contact roller 13 Grinder (grinding grindstone) 14 Bore gauge 17 Reaction roller A Cylinder block C Cylinder liner

Claims (5)

[Claims] 1. A main body shaft which is provided with two or more abutting rollers capable of rolling in contact with an inner surface of a bore to be ground at an equal radial position and which can be positioned with respect to the inner surface of the bore; A grinding wheel that is held at the above-mentioned radial position from the main body shaft and grinds, and a reaction force that is held by the above-mentioned main body shaft and can resiliently contact the inner surface of the bore so as to roll to apply a reaction force in the direction of the grinding wheel Bore grinding machine consisting of rollers. 2. The grinding wheel and the reaction force roller are divided into six equal parts.
2. The bore grinding machine according to claim 1, wherein the plurality of contact rollers are arranged on one diameter line, and the four contact rollers are arranged at other dividing positions. 3. The main body shaft is connected via a universal joint,
2. The bore grinding machine according to claim 1, further comprising a screw drive shaft for rotating and feeding. 4. The bore grinding machine according to claim 1, wherein the driving of the grinding wheel is controlled in accordance with the turning power of the main body shaft. 5. The bore grinding machine according to claim 1, further comprising: a bore gauge plate that forms a disk that can circumscribe the abutment roller on the main body shaft.