Drilling device for detecting crank arm difference

Abstract

The present invention belongs to the field of crankshaft maintenance equipment, and specifically relates to a drilling device for detecting crank arm difference, comprising two 60° punches, a bracket, a swivel joint, a rotation control device, a fixed stud, and a prismatic stud. The thread directions of the two ends of the prismatic stud are opposite. The bracket comprises a drilling part and two symmetrically arranged wing plates connected to two sides of the drilling part. The drilling part is a U-shaped frame. The prismatic stud is arranged in the U-shaped frame. The two swivel joints are respectively arranged in two transverse through holes. When in use, the positioning horizontal plane is close to the counterweight mounting end face of the crankshaft, the bracket is fixed on the counterweight mounting end face, the two 60° punches are aligned with the positions to be drilled on the crank arm, the prismatic stud is rotated, and the two swivel joints move outward under the drive of the prismatic stud, and are pushed outward by the swivel joint to realize drilling of the crank arm. The drilling device has rapid positioning and high punching efficiency and has the advantages of simple structure and convenient operation.

Description

Technical Field

[0001] The invention belongs to the field of crankshaft repair equipment, and in particular relates to a drilling device for detecting crank arm difference. Background Art

[0002] During the operation of the internal combustion engine, the main bearings of each track are unevenly worn, causing overall and local deformation of the crankshaft. During one rotation of the crankshaft, the crank arms open and close slightly, and the distance difference between adjacent crank arms (crank arm difference) is measured to understand and control the deformation of the crankshaft and the wear of the main bearings to prevent fatigue damage to the crankshaft. When detecting the crank arm difference, it is usually necessary to install the arm distance gauge rod in the reference hole on the crankshaft arm. In order to facilitate the rapid and accurate installation of the crankshaft gauge, a hole is usually drilled at (S+D) / 2 (S is the piston stroke, and D is the main journal diameter) on the center symmetry line inside the crank arm when manufacturing the crankshaft as a fixed measuring point.

[0003] In order to punch the crank arm difference positioning holes on the two crank arm surfaces, a punch with a head angle of 60 degrees is used in the prior art. The punch is held and hit with a hammer on the rear end of the punch to punch holes at the determined points on the crank arm surfaces. Alternatively, a simple screw punch assembly is used to punch holes at the marked determined positions by rotating the screw.

[0004] In the above-mentioned punching method of the prior art, since the distance between the two crank arm surfaces is small, the punch can only be extended obliquely into the crank arm surface on one side to perform the punching operation, the error caused by human factors is large, the operation is inconvenient, and it is necessary to measure and mark the punching position in advance. The punching quality is poor, and the position, hole diameter, and hole depth cannot be accurately controlled, resulting in poor matching of the two end rods of the arm distance meter when inserted into the positioning hole, affecting the detection and low detection accuracy.

[0005] The crank is usually equipped with a counterweight. For some crankshafts, especially medium and large crankshafts (with a diameter of more than 130mm), the counterweight is usually installed at the end of the crank by bolts, and the end face of the crankshaft where the counterweight is installed is parallel to the axis of the crankshaft. Summary of the invention

[0006] The purpose of the present invention is to provide a drilling device for detecting crank arm difference, which has the advantages of rapid positioning and good drilling effect, in view of the shortcomings of the prior art.

[0007] The technical solution to achieve the above-mentioned purpose includes the following contents.

[0008] A drilling device for detecting crank arm difference, comprising two 60° punches arranged horizontally, a bracket, a swivel joint, a rotation control device, a fixing stud, and a prismatic stud. The threads at both ends of the prismatic stud are in opposite directions, one end of the swivel joint is screwed to the end of the prismatic stud, each of the two ends of the prismatic stud is provided with a swivel joint, the other end of the swivel joint is connected to the 60° punch, the center line of the 60° punch is consistent with the axis of the prismatic stud, the bracket comprises a drilling part and two symmetrically arranged wing plates connected to both sides of the drilling part, the drilling part is a U-shaped frame, the upper part of the two side walls of the U-shaped frame is provided with two symmetrical transverse through holes, the diameter of the transverse through holes matches the outer diameter of the swivel joint, and the transverse through holes are symmetrically connected to the outer diameter of the swivel joint. A rotation control device is provided in the through hole, one side of the wing plate is connected to the outer side of the top end of the U-shaped frame, a positioning horizontal plane is provided at the bottom of the wing plate, a bolt through hole for screwing and inserting the fixing stud is provided on the wing plate, the prismatic stud is arranged in the U-shaped frame, and the two rotating joints are respectively arranged in the two transverse through holes. The rotating joints are constrained by the rotation control device and the transverse through holes and can only move axially. When in use, the positioning horizontal plane is close to the counterweight mounting end face of the crankshaft, the fixing stud is screwed into the counterweight mounting screw hole and the bracket is fixed to the counterweight mounting end face, the two 60° punches are aligned with the positions to be drilled on the crank arm, the prismatic stud is rotated, and the two rotating joints move outward under the drive of the prismatic stud, and are pushed outward by the rotating joints to realize drilling of the crank arm.

[0009] Furthermore, one end of the 60° punch is installed in a blind hole at the center of the end face of the rotary joint, and the height of the 60° punch protruding from the end face of the rotary joint is equal to the depth required for drilling. This arrangement is conducive to accurately grasping the depth of drilling.

[0010] Further optimization is that the rotation control device includes a rotation control plane and a rotation control stud. The rotation control plane is parallel to the axis of the rotary joint and is arranged on the outer wall of the rotary joint. The rotation control stud is arranged in a through hole on the U-shaped frame. The rotation control stud is perpendicular to the rotation control plane. When in use, one end face of the rotation control stud is in contact with the rotation plane, and the rotary joint cannot rotate under the constraints of the rotation stud and the rotation end face.

[0011] Another optimization scheme is that the turning device includes a turning groove and a turning stud. The turning groove is arranged on the outer wall of the rotary joint. The direction of the turning groove is parallel to the axis of the rotary joint. The turning stud is arranged in a through hole on the U-shaped frame. The diameter of the turning stud is adapted to the width of the turning groove. When in use, one end of the turning stud is inserted into the turning groove, and the rotary joint cannot rotate under the constraints of the turning stud and the turning groove.

[0012] When using the above-mentioned drilling device, first place the U-shaped frame of the bracket between the two cranks, so that the two wing plates of the bracket are aligned with the counterweight mounting surfaces of the two cranks, and screw the fixed studs on the wing plates into the counterweight mounting screw holes, ensuring that the positioning horizontal surfaces of the two wing plates are respectively close to the counterweight mounting surfaces of the two cranks. At this time, the two 60° punches are facing the positions to be drilled on the crank arm surface, and the prismatic studs are rotated to drive the rotary joints to move to both ends. The two 60° punch rotary joints move and contact the crank arm surfaces, and the prismatic studs continue to be rotated. The 60° punch starts drilling until the predetermined depth is reached; reverse the prismatic studs to make the 60° punch withdraw from the drilling, screw the fixed studs out of the counterweight mounting screw holes, and the drilling device can be removed from the crankshaft.

[0013] The present invention utilizes the technical feature that the counterweight mounting surface on the crank has a fixed position. The position to be drilled on the crank arm surface has a certain distance h from the counterweight mounting surface. The 60° punch can only move along the axis in the transverse through hole along with the rotary joint, ensuring that the distance between the 60° punch and the positioning horizontal plane of the wing plate is a constant value. If the constant value is set to h, then after the drilling device is installed on the counterweight mounting surface, the two 60° punches are now facing the position to be drilled on the crank arm surface.

[0014] The drilling device of the present invention can realize self-positioning, fast and accurate drilling of crankshaft crank arm difference measurement reference holes, and the operation is simple and clear. The device itself is light and easy to carry, the manufacturing cost is low, and the drilling efficiency is effectively improved. The device can perform drilling operations on crankshaft crank arm difference measurement reference holes at any position on site, and the skill requirements for operators are not high. The drilling position accuracy is high, and the drilling of the crank arm difference measurement reference hole of a single crank can be completed within 2 minutes. There is no need to measure and mark the position of the crank arm difference measurement reference hole in advance. The operator can conveniently, quickly and accurately complete the drilling operation of the crank arm difference measurement reference hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A schematic diagram of the use state of the first embodiment of the present invention;

[0016] Figure 2 for Figure 1 The enlarged schematic diagram of the middle A part;

[0017] Figure 3 It is a schematic diagram of the local structure of the second embodiment of the present invention.

[0018] In the figure, 1. bracket; 1-1. U-shaped frame; 1-2. wing plate; 1-2-1. positioning horizontal plane; 2. prismatic stud; 3. fixing stud; 4. swivel joint; 4-1. turning plane (turning groove); 5. 60° punch; 6. turning stud; 7. crankshaft; 7-1. counterweight mounting end face; 7-2. counterweight mounting screw hole. DETAILED DESCRIPTION

[0019] The present invention is described in detail below with reference to the embodiments.

[0020] Embodiment 1

[0021] See also Figure 1 and Figure 2 A drilling device for detecting crank arm difference, comprising two 60° punches 5 arranged horizontally, a bracket 1, a rotary joint 4, a rotation control device, a fixed stud 3, and a prism-shaped stud 2. The threads at both ends of the prism-shaped stud 2 are in opposite directions. One end of the rotary joint 4 is matched and screwed to the end of the prism-shaped stud 2. Each end of the prism-shaped stud 2 is provided with a rotary joint 4. One end of the 60° punch 5 is installed in a blind hole at the center of the other end face of the rotary joint 4. The height of the 60° punch protruding from the end face of the rotary joint 4 is the same as the depth required for drilling. The center line of the 60° punch 5 is consistent with the axis of the prismatic stud 2. The bracket 1 includes a drilling portion and two wing plates 2 symmetrically connected to the two sides of the drilling portion. The drilling portion is a U-shaped frame 1-1. The upper part of the two side walls of the U-shaped frame 1-1 is provided with two symmetrical transverse through holes. The diameter of the transverse through holes matches the outer diameter of the rotary joint 4. A rotation control device is provided in the transverse through hole. The rotation control device includes a rotation control plane 4-1 and a rotation control stud 6. The rotation control plane 4-1 is a plane cut on the outer wall of the rotary joint 4. The rotation control plane 4-1 is parallel to the axis of the rotary joint 4. The rotation control stud 6 is arranged in the through hole on the U-shaped frame 1-1, the rotation control stud 6 is perpendicular to the rotation control plane 4-1, the bottom end face of the rotation control stud 6 abuts the rotation control plane 4-1, one side of the wing plate 2 is connected to the outer side of the top of the U-shaped frame 1-1, the bottom of the wing plate 2 is provided with a positioning horizontal plane 1-2-1, the wing plate 2 is provided with a bolt through hole for rotating and inserting the fixing stud 3, the prismatic stud 2 is arranged in the U-shaped frame 1-1, and the two rotary joints 4 are respectively arranged in the two transverse through holes. The rotary joint 4 is constrained by the bottom end face of the rotation control stud 6 and the transverse through hole wall and can only be rotated in the axial direction When moving, when in use, the horizontal plane 1-2-1 is positioned close to the counterweight mounting end face 7-1 of the crankshaft 7, the fixing stud 3 is screwed into the counterweight mounting screw hole 7-2 and the bracket 1 is fixed on the counterweight mounting end face 7-1, the two 60° punches 5 are aligned with the positions to be drilled on the crank arm, the prismatic stud 2 is rotated, and the two rotary joints 4 move outward under the drive of the prismatic stud 2, and are pushed outward by the rotary joint 4 to realize drilling of the crank arm. When the end face of the rotary joint 4 contacts the crank arm surface, the drilling depth is reached, the drilling is completed, and then the drilling device can be removed.

[0022] Embodiment 2

[0023] See also Figure 3The difference between this embodiment and the first embodiment lies in the structure of the rotation control device. The other structures and the use methods are the same as those of the first embodiment. The rotation control device of this embodiment includes a rotation control groove 4-1 and a rotation control stud 6. The rotation control groove 4-1 is arranged on the outer wall of the rotary joint 4. The direction of the rotation control groove 4-1 is parallel to the axis of the rotary joint 4. The rotation control stud 6 is arranged in the through hole on the U-shaped frame 1-1. The diameter of the rotation control stud 6 is adapted to the width of the rotation control groove 4-1. When in use, the bottom end of the rotation control stud 6 is inserted into the rotation control groove 4-1, and the rotary joint 4 cannot rotate under the constraints of the rotation control stud 6 and the rotation control groove 4-1.

Claims

1. A drilling device for detecting crank arm difference, comprising two 60° punches arranged transversely, characterized in that it also comprises a bracket, a swivel joint, a rotation control device, a fixing stud, and a prismatic stud. The threads at both ends of the prismatic stud are in opposite directions. One end of the swivel joint is screwed to the end of the prismatic stud. Each of the two ends of the prismatic stud is provided with a swivel joint. The other end of the swivel joint is connected to the 60° punch. The center line of the 60° punch is consistent with the axis of the prismatic stud. One end of the 60° punch is installed in a blind hole at the center of the end face of the swivel joint. The height of the 60° punch protruding from the end face of the swivel joint is equal to the depth required for drilling. The bracket includes a drilling portion and two wing plates symmetrically arranged and connected to both sides of the drilling portion. The drilling portion is a U-shaped frame. The upper part of the two side walls of the U-shaped frame is provided with two symmetrical transverse through holes. The diameter of the transverse through holes matches the outer diameter of the rotary joint. A rotation control device is provided in the transverse through hole. One side of the wing plate is connected to the outer side of the top end of the U-shaped frame. A positioning horizontal plane is provided at the bottom of the wing plate. A bolt through hole for rotating and inserting a fixing stud is provided on the wing plate. The prismatic stud is provided in the U-shaped frame. The two rotary joints are respectively provided in the two transverse through holes. The rotation control device includes a rotation control plane and a rotation control stud. The rotation control plane is parallel to the axis of the rotary joint and is provided on the outer wall of the rotary joint. The rotation control stud It is arranged in the through hole on the U-shaped frame, and the turning stud is perpendicular to the turning plane. When in use, one end face of the turning stud is in contact with the turning plane, and the swivel joint cannot rotate under the constraints of the turning stud and the turning end face. The swivel joint can only move axially due to the constraints of the turning device and the horizontal through hole wall. When in use, the positioning horizontal plane is close to the counterweight installation end face of the crankshaft, the fixed stud is screwed into the counterweight installation screw hole and the bracket is fixed on the counterweight installation end face, the two 60° punches are aligned with the positions to be drilled on the crank arm, the prismatic stud is rotated, and the two swivel joints move outward under the drive of the prismatic stud, and are pushed outward by the swivel joint to realize drilling of the crank arm.

2. A drilling device for detecting crank arm difference, comprising two 60° punches arranged transversely, characterized in that it also comprises a bracket, a swivel joint, a rotation control device, a fixing stud, and a prismatic stud. The threads at both ends of the prismatic stud are in opposite directions. One end of the swivel joint is screwed to the end of the prismatic stud. Each of the two ends of the prismatic stud is provided with a swivel joint. The other end of the swivel joint is connected to the 60° punch. The center line of the 60° punch is consistent with the axis of the prismatic stud. One end of the 60° punch is installed in a blind hole at the center of the end face of the swivel joint. The height of the 60° punch protruding from the end face of the swivel joint is equal to the depth required for drilling. The bracket includes a drilling portion and two wing plates symmetrically connected to the two sides of the drilling portion. The drilling portion is a U-shaped frame. The upper part of the two side walls of the U-shaped frame is provided with two symmetrical transverse through holes. The diameter of the transverse through holes matches the outer diameter of the rotary joint. A rotation control device is provided in the transverse through hole. One side of the wing plate is connected to the outer side of the top end of the U-shaped frame. A positioning horizontal plane is provided at the bottom of the wing plate. A bolt through hole for rotating and inserting a fixing stud is provided on the wing plate. The prismatic stud is provided in the U-shaped frame. The two rotary joints are respectively provided in the two transverse through holes. The rotation control device includes a rotation control groove and a rotation control stud. The rotation control groove is provided on the outer wall of the rotary joint. The direction of the rotation control groove is parallel to the axis of the rotary joint. The rotation control stud is provided. It is placed in the through hole on the U-shaped frame, and the diameter of the turning stud is matched with the width of the turning groove. When in use, one end of the turning stud is inserted into the turning groove, and the swivel joint cannot rotate under the constraints of the turning stud and the turning groove. The swivel joint is constrained by the turning device and the horizontal through hole wall and can only move axially. When in use, the positioning horizontal plane is close to the counterweight mounting end face of the crankshaft, the fixed stud is screwed into the counterweight mounting screw hole and the bracket is fixed on the counterweight mounting end face, the two 60° punches are aligned with the position to be drilled on the crank arm, the prismatic stud is rotated, and the two swivel joints move outward under the drive of the prismatic stud, and are pushed outward by the swivel joint to realize drilling of the crank arm.

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