Clamp for drilling pin hole in outer circle of crankshaft flange end

Abstract

The utility model discloses a clamp for drilling pin holes in the outer circle of a crankshaft flange end, and relates to the field of automobile part manufacturing. The bottom plate is connected with a drilling machine tool workbench, and the V-shaped supporting device, the axial jacking device, the axial positioning support, the connecting rod neck clamping device and the fixed guiding device are fixedly connected with the bottom plate along the symmetric center line of the bottom plate. The symmetrical center positions of the two V-shaped supporting devices correspond to the main journal M2 and the main journal M7 of the crankshaft. The axial jacking device is installed on the left side of a crankshaft small-end journal, and the axial positioning support is fixed to the crankshaft M6 journal position and jointly used for crankshaft axial positioning. A connecting rod neck clamping device for angular positioning of the crankshaft is arranged at the position of a connecting rod neck of the crankshaft P6; the fixed guiding device used for guiding pin hole machining is installed at the position L away from the right side of the axial positioning support. The device can be well integrated into a crankshaft production line, can fix the crankshaft at a set position when an excircle pin hole is processed on the crankshaft, and is simple to operate, high in efficiency, small in size and convenient to adjust.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile parts manufacturing, in particular to a clamp used for drilling pin holes in the outer circle of a crankshaft flange end. Background Art

[0002] When the engine is running, the crankshaft timing gear cooperates with other gears in the cylinder body. If the angle between the tooth profile center of the crankshaft timing gear and the symmetry center of the crankshaft throw is unreasonable, it may cause the valve timing to be disordered and an alarm to occur when the engine is running. When the crankshaft timing gear is assembled to the crankshaft, the angular positioning is usually carried out by relying on the keyway on one side of the inner hole of the timing gear and the pin on the outer circle pin hole of the crankshaft. Therefore, the angle between the outer circle pin hole of the crankshaft and the symmetry center of the crankshaft throw determines the installation angle of the crankshaft timing gear relative to the crankshaft, and the angular position of the pin hole relative to the crankshaft is an important dimension closely related to assembly. Therefore, it is very important to study a special fixture for drilling pin holes on the outer circle of the crankshaft flange end to meet the processing requirements of the crankshaft pin holes. Summary of the invention

[0003] In order to overcome the shortcomings of the prior art, the purpose of the invention of the utility model is to provide a fixture for drilling pin holes in the outer circle of the crankshaft flange end, so as to clamp and position the crankshaft when batch processing the outer circle pin holes of the crankshaft is required, and play the role of supporting, axially and angularly positioning the crankshaft.

[0004] In order to achieve the above-mentioned purpose of the invention, the base plate of the utility model is connected to the worktable of the drilling machine tool by bolts, and the V-shaped supporting device, the axial tightening device, the axial positioning bracket, the connecting rod neck clamping device, and the fixed guiding device are connected and fixed to the base plate along the symmetrical center line of the base plate by bolts and pins; the symmetrical center positions of the two V-shaped supporting devices correspond to the M2 main journal and the M7 main journal of the crankshaft; the axial tightening device is installed on the left side of the crankshaft small end journal, and the axial positioning bracket is fixed at the position of the crankshaft M6 journal, and they are jointly used for axial positioning of the crankshaft; a connecting rod neck clamping device for angular positioning of the crankshaft is installed at the position of the crankshaft P6 connecting rod neck; the fixed guiding device for pin hole processing guide is installed at the right side L from the axial positioning bracket.

[0005] Furthermore, the V-shaped support device is composed of a V-shaped bracket inlaid with two pads, the pads are made of wear-resistant material, the two pads are at an angle of 90°, and the center heights of the two V-shaped support devices are consistent.

[0006] Furthermore, the support 1 of the axial tightening device is connected and fixed with the base plate along the symmetry center of the base plate by bolts and pins, the push rod is inserted into the inner hole of the support 1, the bolt 2 connects the block used to prevent the push rod from falling off to the right with the push rod, the spring 1 is installed from the left side to the inner hole of the push rod, and the bolt 2 connects the pressure cover with the support 1; adjust the angle of the push rod so that the keyway on the push rod is aligned with the threaded hole of the support 1, install the bolt 1, and insert the bolt 1 into the keyway of the push rod. The bolt 1 makes the inclined surface of the push rod always in a vertical upward state, and the right end of the push rod is provided with a groove for placing the left side pulley journal of the crankshaft small end journal, the end face of the crankshaft small end journal is fitted with the right end face of the push rod, and the crankshaft is horizontally moved to the right side by the reaction force of the spring 1 until the left side end face of the M6 ​​main journal is fitted with the axial positioning bracket, thereby completing the axial positioning of the crankshaft; the axial positioning bracket only contacts the axial positioning surface of the crankshaft and does not contact the outer circle of the crankshaft.

[0007] Furthermore, the positioning block of the connecting rod neck clamping device is connected to the support two by bolts; the support three is installed and fixed opposite to the support two, the pin one is tightly fitted with the hole of the support three, and is slidingly fitted with the hole of the pressure plate, and blind holes for placing the spring two are respectively opened in the support three and the pressure plate; the support four is installed on one side of the support three, the pin four is tightly fitted with the support four, and is connected with the eccentric wheel with a clearance fit, and the eccentric wheel and the handle are tightly connected through the pin three.

[0008] Furthermore, the distance between the support five of the fixed guide device and the axial positioning bracket is consistent with the distance L between the pin hole of the crankshaft and the left end face of the M6 ​​main journal; the drilling template is connected to the support five through pin two, and the drilling template can rotate around the center of pin two, and flat head supports for the fulcrums of the drilling template after the drilling template is rotated into place are respectively installed at the corresponding positions of the support five and the drilling template, and a vertical downward hole is opened on one side of the drilling template, the center of the hole coincides with the center of the pin hole, and an insert sleeve is pressed and installed in the hole, and the insert sleeve is combined with the center drill sleeve, drill sleeve, and reaming sleeve for processing the positioning hole of the pin hole, the bottom hole of the pin hole, and the reaming hole of the pin hole.

[0009] Compared with the prior art, the utility model can be well integrated into the crankshaft production line. When machining the outer cylindrical pin hole on the crankshaft, the crankshaft can be fixed at a set position. The operation is simple, the efficiency is high, the size is compact, and the adjustment is convenient. The utility model has the following advantages:

[0010] 1. The V-shaped support device can place the crankshaft stably and horizontally;

[0011] 2. When the crankshaft is placed downward, due to the gravity of the crankshaft, the small end journal and the inclined surface structure on the push rod of the axial tightening device are squeezed, so that the spring 1 is compressed. When the crankshaft is placed in the V-shaped support device, the spring 1 and the push rod automatically push the small end surface of the crankshaft to move toward the axial positioning bracket until the end surface of the crankshaft journal fits with the axial positioning bracket, and the axial positioning of the crankshaft is completed. This process is carried out simultaneously with the horizontal placement process of the crankshaft, and no additional operation is required, which simplifies the operation steps and saves operation time;

[0012] 3. By turning the handle of the connecting rod neck clamping device, the angular positioning of the crankshaft P6 connecting rod neck can be quickly completed;

[0013] 4. The outer pin hole of the crankshaft can be processed by turning over the drilling template. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a simplified diagram of the crankshaft structure.

[0015] Figure 2 It is a simplified structural diagram of the utility model.

[0016] Figure 3 for Figure 2 Top view of the .

[0017] Figure 4 for Figure 2 A schematic diagram of the structure of the V-shaped support device.

[0018] Figure 5 for Figure 2 Schematic diagram of the connecting rod neck clamping device.

[0019] Figure 6 for Figure 2 Schematic diagram of the structure of the axial positioning bracket.

[0020] Figure 7 for Figure 2 A schematic diagram of the structure of the axial tightening device.

[0021] Figure 8 for Figure 2 A schematic diagram of the structure of the fixed guide device.

[0022] In the figure: 1, crankshaft; 2, small end journal; 3, M2 main journal; 4, M7 main journal; 5, M6 main journal; 6, P6 connecting rod journal; 7, large end journal; 8, bottom plate; 9, axial jacking device; 10, push rod; 11, spring 1; 12, support 1; 13, bolt 1; 14, spacer; 15, stopper; 16, gland; 17, bolt 2; 18, V-shaped bracket; 19, axial positioning bracket; 20, connecting rod journal clamping device; 21, fixing guide device; 22, support 2; 23, positioning block; 24, support 5; 25, Support three; 26. Pressure plate; 27. Pin one; 28. Eccentric wheel; 28-1. Eccentric wheel section; 28-2. Eccentric wheel arc; 28-3. Fillet; 29. ​​Support four; 30. Spring two; 31. Handle; 32. Pin two; 33. Drill template; 34. Center drill sleeve; 35. Drill sleeve; 36. Hinge sleeve; 37. Insert sleeve; 38. Flat head support; 39. Pin hole; 40. Pin three; 41. V-shaped support device; 42. Pin four; 43. Pulley shaft neck; 44. Axial locating surface; 45. Center line of P6 connecting rod neck; 46. Crank. DETAILED DESCRIPTION

[0023] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 As shown, the pin hole 39 of the crankshaft 1 of the utility model is located at the outer circle of the big end journal 7 of the crankshaft 1, and the technical requirements of the pin hole 39 mainly include the axial size of the pin hole 39, that is, the distance L between the center of the pin hole 39 and the left end face of the M6 ​​main journal 5, and the position error of the pin hole 39 relative to the P6 connecting rod journal 6.

[0024] The utility model mainly includes two V-shaped support devices 41, an axial tightening device 9, an axial positioning bracket 19, a connecting rod neck clamping device 20, and a fixing guide device 21. The base plate 8 is connected to the worktable of the drilling machine by bolts, and the V-shaped support device 41, the axial tightening device 9, the axial positioning bracket 19, the connecting rod neck clamping device 20, and the fixing guide device 21 are connected and fixed to the base plate 8 along the symmetrical center line of the base plate 8 by bolts and pins.

[0025] like Figure 4As shown, the symmetrical center positions of the two V-shaped support devices 41 correspond to the M2 main journal 3 and the M7 main journal 4 of the crankshaft 1. When the crankshaft 1 is placed horizontally, the V-shaped support device 41 can support the M2 main journal 3 and the M7 main journal 4 of the crankshaft 1. The V-shaped support device 41 is composed of a V-shaped bracket 18 inlaid with two pads 14. The pads 14 are made of wear-resistant materials. The two pads 14 are at an angle of 90°. The height of the center of a circle tangent to the two pads 14 and having a diameter D1 of the main journal of the crankshaft 1 from the bottom plate 8 is the crankshaft center height H. The center heights of the two V-shaped support devices 41 are consistent, thereby ensuring that the crankshaft 1 is horizontal after being placed.

[0026] like Figure 6 , Figure 7 As shown, the axial clamping device 9 is installed on the left side of the small end journal 2 of the crankshaft 1, and the axial positioning bracket 19 is fixed at the position of the M6 ​​journal 5 of the crankshaft 1, and they are used together for axial positioning of the crankshaft 1. The support 12 of the axial clamping device 9 is connected and fixed to the base plate 8 along the symmetry center of the base plate 8 by bolts and pins. The push rod 10 is inserted into the inner hole of the support 12. The bolt 17 connects the block 15 to the push rod 10 to prevent the push rod 10 from falling off to the right. The spring 11 is installed from the left side to the inner hole of the push rod 10. The bolt 17 is used to connect the pressure cover 16 to the support 12. At this time, the push rod 10 is in an extended state under the action of the spring 11. The angle of the push rod 10 is adjusted so that the keyway on the push rod 10 and the thread of the support 12 are aligned. The holes are aligned, bolt 13 is installed, and bolt 13 is inserted into the keyway of push rod 10. Bolt 13 keeps the inclined surface of push rod 10 always in a vertical upward state. A groove is provided at the right end of push rod 10 for placing the left pulley journal 43 of the small end journal 2 of crankshaft 1; the axial positioning bracket 19 only contacts with the axial positioning surface 44 of crankshaft 1, and does not contact with the outer circle of crankshaft 1. The outer circle diameter of the positioning surface of axial positioning bracket 19 is consistent with the axial positioning surface diameter D2 of crankshaft 1, and the inner circle diameter of the positioning surface is larger than the main journal diameter D1 of crankshaft 1. When the crankshaft 1 is placed downward, the small end journal 2 of the crankshaft 1 falls along the inclined surface of the push rod 10, and the gravity of the crankshaft 1 is decomposed into a thrust to the left applied to the push rod 10 through the inclined surface of the push rod 10, and the spring 11 is compressed. When the crankshaft 1 is placed horizontally, the groove at the right end of the push rod 10 is used to place the pulley journal 43 on the left side of the small end journal 2 of the crankshaft 1, so that the pulley journal 43 is in a suspended state, and the end face of the small end journal 2 of the crankshaft 1 is in contact with the right end face of the push rod 10, and the crankshaft 1 moves horizontally to the right side under the reaction force of the spring 11, and when it moves to the left end face of the M6 ​​main journal 5 and is in contact with and pressed against the axial positioning bracket 19, the axial positioning of the crankshaft 1 is completed.

[0027] like Figure 5As shown, a connecting rod neck clamping device 20 is installed at the position of the P6 connecting rod neck 6 of the crankshaft 1 for angular positioning of the crankshaft 1. The positioning block 23 of the connecting rod neck clamping device 20 is connected to the support 22 by bolts. The height of the symmetry center of the positioning block 23 is the sum of the crankshaft center height H and the radius R1 of the crank 46 of the crankshaft 1. The horizontal distance between the end face of the positioning block 23 and the center line 45 of the P6 connecting rod neck is the connecting rod neck radius R2, so as to ensure that when the P6 connecting rod neck 6 of the crankshaft 1 fits with the end face of the positioning block 23, the center line 45 of the P6 connecting rod neck is in a vertical state; the support 3 25 is installed and fixed on the opposite side of the support 22, and the pin 1 27 is between the hole of the support 3 25. The hole of the pressure plate 26 is a tight fit, and the hole of the pressure plate 26 is a sliding fit. The single-side width of the left end face of the pressure plate 26 is L2. The center of the support three 25 is located at the right side L1 of the center line 45 of the P6 connecting rod neck. L1 is the sum of the radius R2 of the crankshaft 1 connecting rod neck and the single-side width L2 of the left end face of the pressure plate 26. A blind hole is opened on the left side of the support three 25, and a blind hole is also opened at the corresponding position of the pressure plate 26. The spring two 30 is placed in the blind hole; when the handle 31 is lifted, the eccentric wheel 28 rotates counterclockwise around the center of the pin four 42, and the eccentric wheel section 28-1 and the pressure plate 26 The end face of the eccentric wheel is fitted, and since the eccentric wheel section 28-1 has a smaller diameter, the pressure plate 26 is subjected to the force of the spring 2 30 to rotate clockwise around the pin 1 27, so that the distance between the left end face of the pressure plate 26 and the positioning block 23 becomes larger, and the clamping operation of the crankshaft 1 can be performed at this time; the support 4 29 is installed on the right side of the support 3 25, the pin 42 is tightly matched with the support 4 29, and is connected with the eccentric wheel 28 with a clearance fit, and the eccentric wheel 28 is tightly connected with the handle 31 through the pin 3 40; when the crankshaft 1 falls into place, the crankshaft 1 is rotated to make the crankshaft 1 The outer circle of the P6 connecting rod neck 6 fits with the positioning block 23, and the handle 31 is pressed downward. The eccentric wheel 28 rotates clockwise around the pin four 42. There is a rounded corner 28-3 between the eccentric wheel section 28-1 and the eccentric wheel arc 28-2. When the eccentric wheel 28 rotates, it smoothly contacts and transitions with the pressure plate 26. When a section of the eccentric wheel arc 28-2 with a larger diameter contacts the pressure plate 26, the pressure plate 26 is lifted up and rotated counterclockwise around the pin one 27 until the left end face of the pressure plate 26 is pressed tightly against the outer circle of the P6 connecting rod neck 6. At this time, the angular positioning of the crankshaft 1 can be completed.

[0028] like Figure 8As shown, the fixed guide device 21 is installed at L on the right side of the axial positioning bracket 19, where L is the distance between the center of the pin hole 39 and the left end surface of the M6 ​​main shaft neck 5. The fixed guide device 21 is used to guide the center drill sleeve 34, the drill sleeve 35, and the reamer sleeve 36 when processing the pin hole 39. The distance between the support five 24 of the fixed guide device 21 and the axial positioning bracket 19 is consistent with the distance L between the pin hole 39 of the crankshaft 1 and the left end face of the M6 ​​main journal 5 to ensure the axial size of the pin hole 39 during processing; the drilling template 33 is connected to the support five 24 through the pin two 32, and the drilling template 33 can rotate around the center of the pin two 32. Flat head supports 38 are respectively installed at the corresponding positions of the support five 24 and the drilling template 33, which are used as fulcrums after the drilling template 33 is rotated into place. The flat head supports 38 are made of wear-resistant materials with high hardness. A vertical downward hole is opened on one side of the drilling template 33, and the center of the hole coincides with the center of the pin hole 39. A sleeve 37 is pressed and installed in the hole. The sleeve 37 is respectively combined with the center drill sleeve 34, the drill sleeve 35, and the reaming sleeve 36 to process the positioning hole of the pin hole 39, the bottom hole of the pin hole 39, and the reaming hole of the pin hole 39. After the sleeve 37 is worn, only the sleeve 37 can be replaced to ensure the processing position accuracy of the pin hole 39. When processing the pin hole 39, the drilling template 33 fixed on the support 5 24 is turned over so that the drilling template 33 is parallel to the horizontal center line of the outer circle of the big end journal 7 of the crankshaft 1, and the center of the hole of the drilling template 33 is concentric with the center of the pin hole 39. By replacing the center drill sleeve 34, the drill sleeve 35, and the reaming sleeve 36, the positioning hole of the pin hole 39, the bottom hole of the pin hole 39, and the reaming of the pin hole 39 are completed, thereby ensuring the technical requirements of the pin hole 39.

Claims

1. A fixture for drilling pin holes on the outer circle of a crankshaft flange end, characterized in that: The base plate (8) is connected to the worktable of the drilling machine by bolts. The V-shaped support device (41), the axial clamping device (9), the axial positioning bracket (19), the connecting rod neck clamping device (20), and the fixed guide device (21) are connected and fixed to the base plate (8) along the symmetrical center line of the base plate (8) by bolts and pins. The symmetrical center positions of the two V-shaped support devices (41) correspond to the M2 main journal (3) and the M7 main journal (4) of the crankshaft (1). The axial clamping device (9) is installed on the left side of the small end journal (2) of the crankshaft (1). The axial positioning bracket (19) is fixed at the position of the M6 ​​journal (5) of the crankshaft (1) and is used for axial positioning of the crankshaft (1). The connecting rod neck clamping device (20) for angular positioning of the crankshaft (1) is installed at the position of the P6 connecting rod neck (6) of the crankshaft (1). The fixed guide device (21) for guiding the processing of the pin hole (39) is installed at the right side L away from the axial positioning bracket (19).

2. The fixture for drilling pin holes on the outer circle of the crankshaft flange end according to claim 1, characterized in that: The V-shaped support device (41) is composed of a V-shaped bracket (18) inlaid with two cushion blocks (14), the cushion blocks (14) are made of wear-resistant material, the two cushion blocks (14) are at an angle of 90°, and the center heights of the two V-shaped support devices (41) are consistent.

3. The fixture for drilling pin holes on the outer circle of the crankshaft flange end according to claim 1, characterized in that: The support 1 (12) of the axial tightening device (9) is connected and fixed to the bottom plate (8) along the symmetry center of the bottom plate (8) by bolts and pins, the push rod (10) is inserted into the inner hole of the support 1 (12), the bolt 2 (17) connects the stopper (15) used to prevent the push rod (10) from falling off to the right with the push rod (10), the spring 1 (11) is installed from the left side to the inner hole of the push rod (10), the bolt 2 (17) connects the pressure cover (16) to the support 1 (12); adjust the angle of the push rod (10) so that the keyway on the push rod (10) is aligned with the threaded hole of the support 1 (12), install the bolt 1 (13), and insert the bolt 1 (13) into the push rod ( The push rod (10) is provided with a keyway of the push rod (10), a bolt (13) keeps the inclined surface of the push rod (10) always in a vertically upward state, a groove for accommodating the left pulley journal (43) of the small end journal (2) of the crankshaft (1), the end surface of the small end journal (2) of the crankshaft (1) is fitted with the right end surface of the push rod (10), and the crankshaft (1) is horizontally moved to the right side by the reaction force of the spring (11) until the left end surface of the M6 ​​main journal (5) is fitted with the axial positioning bracket (19), thereby completing the axial positioning of the crankshaft (1); the axial positioning bracket (19) only contacts the axial positioning surface (44) of the crankshaft (1) and does not contact the outer circle of the crankshaft (1).

4. The fixture for drilling pin holes on the outer circle of the crankshaft flange end according to claim 1, characterized in that: The positioning block (23) of the connecting rod neck clamping device (20) is connected to the support two (22) by bolts; the support three (25) is installed and fixed on the opposite side of the support two (22); the pin one (27) is tightly fitted with the hole of the support three (25) and is slidingly fitted with the hole of the pressure plate (26); the support three (25) and the pressure plate (26) are respectively provided with blind holes for accommodating the spring two (30); the support four (29) is installed on one side of the support three (25); the pin four (42) is tightly fitted with the hole of the support four (29) and is clearance fitted with the hole of the eccentric wheel (28); the eccentric wheel (28) and the handle (31) are tightly connected through the pin three (40).

5. The fixture for drilling pin holes on the outer circle of the crankshaft flange end according to claim 1, characterized in that: The distance between the support seat 5 (24) of the fixed guide device (21) and the axial positioning bracket (19) is consistent with the distance L between the pin hole (39) of the crankshaft (1) and the left end surface of the M6 ​​main journal (5); the drilling template (33) is connected to the support seat 5 (24) through the pin 2 (32), and the drilling template (33) can rotate around the center of the pin 2 (32). Flat head supports (38) for supporting the drilling template (33) after the drilling template (33) is rotated into place are respectively installed at corresponding positions of the support seat 5 (24) and the drilling template (33). A hole is opened vertically downward on one side of the drilling template (33), and the center of the hole coincides with the center of the pin hole (39). An insert sleeve (37) is pressed and installed in the hole. The insert sleeve (37) is respectively combined with the center drill sleeve (34), the drill sleeve (35), and the reaming sleeve (36) for processing the positioning hole of the pin hole (39), the bottom hole of the pin hole (39), and the reaming hole of the pin hole (39).

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