Clamp for drilling inclined oil hole in crankshaft of marine diesel engine

Abstract

The utility model relates to the technical field of crankshaft machining, in particular to a clamp for drilling an inclined oil hole in a crankshaft of a marine diesel engine, which comprises a clamping part, a clamping part and a clamping part, the positioning piece is arranged on the clamping part and is connected with a straight oil hole in the connecting rod journal to realize the positioning of the clamping part; and the drilling jig piece is adjustably arranged on the clamping part and corresponds to the crankshaft crank. The clamp is compact in structure and easy and convenient to operate, the equipment cost and the labor cost can be greatly reduced, the machining efficiency and quality of the inclined oil hole of the crankshaft of the marine diesel engine are effectively improved, and high practical value is achieved.

Description

Technical Field

[0001] This utility model relates to the field of crankshaft processing technology, and in particular to a fixture for drilling oblique oil holes in marine diesel engine crankshafts. Background Technology

[0002] Currently, a horizontal machining center is used to machine the inclined oil holes by rotation. Due to the size of the machine tool, the accuracy of the rotation angle, and interference in the machining position, machining a crankshaft requires two hoisting operations and rotation angle adjustments. The rotation angle also requires position measurement and leveling of the crankshaft connecting rod stops. A crankshaft can only machine a maximum of two holes per clamping operation. A crankshaft with six connecting rod stops requires three clamping operations, plus an additional hoisting operation due to machine tool travel limitations and fixture interference. Each clamping operation requires leveling the connecting rod stops and finding their center position. It takes two shifts to complete machining one crankshaft. It is evident that the original machining method has very high production time costs and places relatively high demands on the operators. Utility Model Content

[0003] In order to solve the above-mentioned technical problems existing in the prior art, the present invention proposes the following specific technical solution:

[0004] A clamp for drilling angled oil holes in a marine diesel engine crankshaft includes: a clamping part, which is adjustable and disposed on the connecting rod journal side of the crankshaft; a positioning element, disposed on the clamping part and connected to the straight oil hole on the connecting rod journal to achieve positioning of the clamping part; and a drilling jig, disposed on the clamping part and corresponding to the crankshaft crank.

[0005] Furthermore, the clamping part includes a star-shaped handle, a left drill jig body, a double-ended stud, and a right drill jig body. The right drill jig body has a semi-annular structure, and its two ends are connected to the left drill jig body through the double-ended stud. The double-ended stud passes through the left drill jig body and is threadedly connected to the star-shaped handle. By rotating the star-shaped handle, the distance between the left drill jig body and the right drill jig body can be adjusted to clamp or release the connecting rod journal.

[0006] Furthermore, the positioning element is disposed on the right drill jig body and corresponds to the position of the left drill jig body. The positioning element includes a positioning bushing and a positioning pin. The positioning pin is inserted into the straight oil hole on the connecting rod journal through the positioning bushing.

[0007] Furthermore, the drill jig component includes a drill template, a drill sleeve screw, and a quick-change drill sleeve. The drill template includes an mounting part and a fitting part. The mounting part is mounted on the right drill jig body by fasteners. The fitting part corresponds to the upper side of the crank. The quick-change drill sleeve is fixed to the fitting part by the drill sleeve screw.

[0008] Furthermore, the mounting part is provided with a ball head bolt, the lower end of which abuts against the top of the crank, and the contact surface between the fitting part and the crank is controlled by adjusting the ball head bolt.

[0009] Furthermore, the fitting part is provided with a fixing bushing, and the quick-change drill bushing is fixed in the fixing bushing by drill bushing screws.

[0010] Furthermore, the fastener includes a hexagon socket head cap screw, a washer, and an internally threaded cylindrical pin, with the hexagon socket head cap screw and the washer engaging.

[0011] Furthermore, the inner wall of the semi-annular structure is an arc surface, which matches the curved surface of the connecting rod journal.

[0012] Furthermore, the right drill mold body is equipped with lifting eye bolts.

[0013] Beneficial effects: The fixture of this utility model has a compact structure and is easy to operate. It can greatly reduce equipment costs and labor costs, and effectively improve the processing efficiency and quality of the inclined oil hole of the crankshaft of marine diesel engine. It has high practical value. Attached Figure Description

[0014] Figure 1 This is a side view of a fixture for drilling angled oil holes in a marine diesel engine crankshaft, according to an embodiment of this utility model.

[0015] Figure 2 yes Figure 1 The left view;

[0016] Figure 3 yes Figure 1 Top view;

[0017] Figure 4 This is a three-dimensional structural schematic diagram of a fixture for drilling oblique oil holes in a marine diesel engine crankshaft according to an embodiment of the present invention.

[0018] In the diagram, 1-star handle, 2-left drill jig, 3-double-ended stud, 4-drill template, 5-hex socket head cap screw, 6-washer, 7-drill bushing screw, 8-right drill jig, 9-positioning bushing, 10-positioning pin, 11-eye bolt, 12-ball head bolt, 13-quick-change drill bushing, 14-fixed bushing, 15-internal threaded cylindrical pin. Detailed Implementation

[0019] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0020] like Figures 1 to 4As shown in the figure, a fixture for drilling oblique oil holes in a marine diesel engine crankshaft according to this embodiment includes a clamping part, a positioning part and a drilling jig on the clamping part. The clamping part is adjustable and is set on the connecting rod journal side of the crankshaft. The positioning part is connected to the straight oil hole on the connecting rod journal to achieve the initial positioning of the clamping part. The drilling jig corresponds to the crankshaft crank position. The drilling equipment completes the machining of the oblique oil hole in the crankshaft through the drilling jig.

[0021] Specifically, the clamping part is the core of the fixture, and its main function is to firmly fix the connecting rod journal of the crankshaft. This clamping part adopts an adjustable design and includes a star-shaped handle 1, a left drill jig body 2, double-ended studs 3, and a right drill jig body 8. The right drill jig body 8 adopts a semi-annular structure, with both ends connected to the left drill jig body 2 via double-ended studs 3. The double-ended studs 3 pass through the left drill jig body 2 and are screwed into the star-shaped handle 1. The inner wall of the semi-annular structure is designed as an arc surface matching the size of the connecting rod journal. The distance between the left drill jig body 2 and the right drill jig body 8 can be adjusted using the star-shaped handle 1, thereby clamping or releasing the connecting rod journal located between the two jig bodies. This design not only simplifies operation but also ensures a stable connection between the fixture and the workpiece.

[0022] The positioning component is mounted on the right drill jig body 8 and corresponds to the position of the left drill jig body 2. It includes a positioning bushing 9 and a positioning pin 10. The positioning pin 10 is inserted into the straight oil hole on the connecting rod journal through the positioning bushing 9, thereby completing the positioning of the clamping component and the drill jig component on the crankshaft side. A lifting eye bolt 11 is also provided on the right drill jig body 8 to facilitate the lifting of the clamp by external equipment.

[0023] The drill jig assembly includes a drill template 4, drill sleeve screws 7, M10 ball head bolts 12, quick-change drill sleeves 13, and a fixed bushing 14. The drill template 4 is designed with two parts: an mounting part and a fitting part. The mounting part is mounted on the right drill jig body 8 using fasteners. The fasteners include hex socket head cap screws 5, washers 6, and internally threaded cylindrical pins 15. The M10 ball head bolts 12 are threaded to the mounting part, and the lower end of the M10 ball head bolts 12 abuts against the crank. The distance and angle between the fitting part and the upper side of the crank can be adjusted by adjusting the M10 ball head bolts 12, i.e., adjusting the contact surface between the two. The fixed bushing 14 is located in the fitting part, and the quick-change drill sleeve 13 is fixed inside the fixed bushing 14 by the drill sleeve screws 7. This design not only facilitates the replacement of the drill sleeve but also improves processing efficiency.

[0024] In practical use, the fixture is first accurately positioned on the crankshaft using the positioning components, and then firmly fixed to the connecting rod journal using the clamping parts. Finally, by adjusting the drill jig to ensure it is fully aligned with the crankshaft, precise machining of the inclined oil hole can be performed. The entire clamping and positioning process is simple to operate and ensures the stability and consistency of machining quality.

[0025] This utility model's clamping device is adaptable to different types of crankshaft drilling machines. In practical applications, it greatly reduces processing steps and time, reducing the processing time from two shifts to one shift, significantly improving processing efficiency and machine tool utilization, thus doubling production capacity and demonstrating high practical value.

[0026] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in the embodiments of this utility model are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicator will also change accordingly. In this utility model, unless otherwise explicitly specified and limited, the terms "connection" and "fixed" should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal connection of two components or the interaction between two components, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0027] The above description is merely a preferred embodiment of this utility model and does not constitute any limitation on this utility model. Although the implementation process of this utility model has been described in detail above, those skilled in the art can still modify the technical solutions described in the foregoing examples or make equivalent substitutions for some of the technical features. All modifications and equivalent substitutions made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A fixture for drilling angled oil holes in a marine diesel engine crankshaft, characterized in that, include: The clamping part is adjustable and located on the connecting rod journal side of the crankshaft; A positioning component is provided on the clamping part and is connected to the straight oil hole on the connecting rod journal to achieve positioning of the clamping part; The drill jig is mounted on the clamping part and corresponds to the crankshaft crank. The clamping part includes a star handle (1), a left drill jig (2), a double-ended stud (3), and a right drill jig (8). The right drill jig (8) has a semi-circular structure, and its two ends are connected to the left drill jig (2) through the double-ended stud (3). The double-ended stud (3) passes through the left drill jig (2) and is threaded to the star handle (1). By rotating the star handle (1), the distance between the left drill jig (2) and the right drill jig (8) can be adjusted to clamp or loosen the connecting rod journal.

2. The clamp according to claim 1, characterized in that, The positioning element is set on the right drill jig (8) and corresponds to the position of the left drill jig (2). The positioning element includes a positioning bushing (9) and a positioning pin (10). The positioning pin (10) is inserted into the straight oil hole on the connecting rod journal through the positioning bushing (9).

3. The clamp according to claim 1, characterized in that, The drill jig includes a drill template (4), a drill sleeve screw (7), and a quick-change drill sleeve (13). The drill template (4) includes an mounting part and a fitting part. The mounting part is mounted on the right drill jig body (8) by fasteners. The fitting part corresponds to the upper side of the crank. The quick-change drill sleeve (13) is fixed to the fitting part by the drill sleeve screw (7).

4. The clamp according to claim 3, characterized in that, The mounting part is provided with a ball head bolt (12), the lower end of which abuts against the top of the crank. The contact surface between the fitting part and the crank is controlled by adjusting the ball head bolt (12).

5. The clamp according to claim 3, characterized in that, The fitting part is provided with a fixed bushing (14), and the quick-change drill bushing (13) is fixed in the fixed bushing (14) by the drill bushing screw (7).

6. The clamp according to claim 3, characterized in that, The fasteners include hexagon socket bolts (5), washers (6) and internally threaded cylindrical pins (15), with the hexagon socket bolts (5) and washers (6) engaging to connect.

7. The clamp according to claim 1, characterized in that, The inner wall of the semi-annular structure is an arc surface, which matches the curved surface of the connecting rod journal.

8. The clamp according to claim 1, characterized in that, The right drill mold (8) is equipped with a lifting eye bolt (11).

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