Center hole adjustable limiting device for crankshaft machining

Abstract

The utility model discloses an adjustable limiting device for machining a central hole in a crankshaft, which is provided with a bottom plate, the bottom plate is provided with left V-shaped iron and right V-shaped iron, and a crankshaft is erected between the left V-shaped iron and the right V-shaped iron; an axial positioning seat is arranged in the direction perpendicular to the crankshaft, an axial positioning pin is sleeved in the axial positioning seat in a penetrating mode, an outer ring of the axial positioning pin abuts against the inner wall of the axial positioning seat, a bottom plate of the axial positioning seat is connected with a bottom plate, and an angular positioning seat is arranged on the front portion, corresponding to the axial positioning pin, of the bottom plate. The crankshaft angular positioning device has the advantages that the axial positioning pin can be inserted into a crankshaft thrust gear to position the axial size, the crankshaft is rotated to enable a connecting rod neck to fall on the angular positioning block, and angular positioning of the crankshaft is achieved; the problems of quick positioning and multi-model adaptation in crankshaft center hole machining are solved.

Description

Technical Field

[0001] This utility model relates to the field of crankshaft machining technology, and is particularly applicable to high-precision positioning and limiting in crankshaft center hole drilling. Background Technology

[0002] The crankshaft is placed on a V-slot for calibration before being measured and machined. To accommodate crankshafts of different models and sizes, V-slots of different sizes need to be produced, resulting in an excessive number of V-slots. Furthermore, the adjustment and positioning efficiency is low and the changeover time is long during calibration. Utility Model Content

[0003] To solve the problem of rapid positioning and compatibility with multiple models in crankshaft center hole machining, this utility model discloses an adjustable limiting device for crankshaft center hole machining.

[0004] The specific technical solution is as follows:

[0005] An adjustable limiting device for crankshaft machining center holes includes a base plate with left and right V-blocks, between which the crankshaft is mounted. An axial positioning seat is positioned perpendicular to the crankshaft, with an axial positioning pin fitted into it. The outer ring of the axial positioning pin abuts against the inner wall of the axial positioning seat. The base plate of the axial positioning seat abuts against the base plate. An angular positioning seat is located at the front of the base plate corresponding to the axial positioning pin. The angular positioning seat includes a base with a rod portion and a countersunk through-hole. A screw passes through the countersunk through-hole to fix the angular positioning seat to the base. Rotating the crankshaft connecting rod journal allows it to rest on the upper surface of the angular positioning seat for angular positioning.

[0006] The left V-shaped iron includes an L-shaped bracket with a V-shaped groove; two symmetrical positioning grooves are provided at the lower end of the bracket; through holes are provided on the base plate at positions corresponding to the positioning grooves, and bolts pass through the positioning grooves and through holes to fix the left V-shaped iron to the base plate; the structure of the right V-shaped iron is the same as that of the left V-shaped iron.

[0007] The angular positioning seat has a positioning pad at its upper end.

[0008] The rear end of the axial positioning pin is provided with a handle and a handle pin that passes through the handle.

[0009] To ensure the positioning of the axial locating pin, a locking screw hole is provided on the axial locating seat, through which a locking screw passes and abuts against the axial locating pin. The inner diameter of the axial locating seat has a tolerance grade of H7, the outer diameter of the axial locating pin has a tolerance grade of g6, and the axial locating pin is clearance-fitted into the axial locating seat.

[0010] Another structure is: the axial positioning seat is threaded, the axial positioning pin is also threaded, and the axial positioning pin is screwed into the axial positioning seat.

[0011] The advantages of this invention are: it solves the problem of rapid positioning and multi-model compatibility in crankshaft center hole machining. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model;

[0013] Figure 2-1 This is the front view of the left V-shaped iron;

[0014] Figure 2-2 yes Figure 2-1 The left view;

[0015] Figure 2-3 yes Figure 2-1 Top view;

[0016] Figure 3-1 This is the front view of the angular positioning seat;

[0017] Figure 3-2 yes Figure 3-1 The left view;

[0018] Figure 4-1 This is the front view of the positioning seat;

[0019] Figure 4-2 yes Figure 4-1 The left view. Detailed Implementation

[0020] The present invention will now be described in detail with reference to the accompanying drawings. As shown in the figures, an adjustable limiting device for a crankshaft machining center hole is provided, comprising a base plate 4, on which a left V-shaped iron 1 and a right V-shaped iron 3 are provided. The left V-shaped iron 1 includes an L-shaped bracket 101, on which a V-shaped groove 102 is provided; two symmetrical positioning grooves 103 are provided at the lower end of the bracket; through holes are provided on the base plate at positions corresponding to the positioning grooves, and bolts 2 pass through the positioning grooves and through holes to fix the left V-shaped iron 1 to the base plate 4; the structure of the right V-shaped iron is the same as that of the left V-shaped iron. Thus, by adjusting the fixed positions of the left V-shaped iron 1 and the right V-shaped iron 3, the center distance between the left V-shaped iron 1 and the right V-shaped iron 3 can be adjusted; the crankshaft is mounted between the left V-shaped iron and the right V-shaped iron; an axial positioning seat 501 is set in a direction perpendicular to the crankshaft, the axial seat 501 is fixed on the axial seat base plate 503, the axial seat base plate 503 is also provided with a strip groove 502, and the base plate 4 is provided with a through hole corresponding to the position of the strip groove. Bolts pass through the strip groove and the through hole to fix the axial seat base plate on the base plate 4.

[0021] The base plate is T-shaped.

[0022] The outer ring of the axial positioning pin 8 is engaged with the inner wall of the axial positioning seat 501, and the base plate 4 is provided with an angular positioning seat 9 at the front corresponding to the axial positioning pin.

[0023] The angular positioning seat 9 has the following structure: Figure 3-1 and Figure 3-2 As shown, it includes a base 902 below, a rod 901 on the base 902, and a groove through hole 903 on the base. Screws 10 pass through the groove through hole 903 to fix the angular positioning seat 9 to the base 4; the rotating crankshaft connecting rod neck falls on the upper end face of the angular positioning seat 9 for angular positioning.

[0024] The upper end of the angular positioning seat rod 901 is provided with a positioning pad 11. This structure ensures that different crankshaft angular positioning can be achieved by replacing the positioning pad.

[0025] The rear end of the axial positioning pin is provided with a handle 7 and a handle pin 6 passing through the handle 7.

[0026] To ensure the positioning of the axial locating pin, a locking screw hole 12 is provided on the axial locating seat. The locking screw passes through the inner hole of the locating seat with a tolerance grade of H7, and the outer diameter of the axial locating pin has a tolerance grade of g6. The axial locating pin is clearance-fitted into the locating seat. The screw hole abuts against the axial locating pin. The inner hole of the axial locating seat has a tolerance grade of H7, the outer diameter of the axial locating pin has a tolerance grade of g6, and the axial locating pin is clearance-fitted into the locating seat.

[0027] Another structure is: the axial positioning seat is threaded, the axial positioning pin is also threaded, and the axial positioning pin is screwed into the axial positioning seat.

[0028] The axial locating pin can be manually moved forward and backward, facilitating the installation and removal of the crankshaft. The axial locating pin can also be replaced to accommodate crankshafts of different specifications.

[0029] The working principle of this invention is as follows: the extension and retraction of the axial positioning pin enables free loading and unloading of the crankshaft. First, the axial positioning pin is pulled out to create space, and the crankshaft is placed on the V-shaped support of the machine tool. The crankshaft is rotated so that its connecting rod journal falls onto the angular positioning block, achieving angular positioning of the crankshaft. Then, the axial positioning pin is pushed into the crankshaft thrust stop, and the axial positioning pin is rotated to position itself on the shoulder end face of the crankshaft thrust stop, achieving axial positioning of the crankshaft. This fixes the loading position of each crankshaft, ensuring the consistency of the depth and center position of the machining center hole for each crankshaft.

Claims

1. An adjustable limiting device for machining center holes of crankshafts, characterized in that: A base plate is provided, with a left V-shaped iron and a right V-shaped iron on the base plate. The crankshaft is mounted between the left and right V-shaped irons. An axial positioning seat is provided perpendicular to the crankshaft and is fixed to the axial seat base plate. The axial seat base plate also has a strip groove and a through hole corresponding to the position of the strip groove. Bolts pass through the strip groove and the through hole to fix the axial seat base plate to the base plate. An axial positioning pin is sleeved in the axial positioning seat, and the outer ring of the axial positioning pin abuts against the inner wall of the axial positioning seat. An angular positioning seat is provided at the front of the base plate corresponding to the axial positioning pin. The angular positioning seat includes a base with a rod on it and a countersunk through hole on it. Screws pass through the countersunk through hole to fix the angular positioning seat to the base. The crankshaft connecting rod journal is rotated and falls on the upper end face of the angular positioning seat for angular positioning.

2. The adjustable limiting device for crankshaft machining center holes according to claim 1, characterized in that: The left V-shaped iron includes an L-shaped bracket with a V-shaped groove; two symmetrical positioning grooves are provided at the lower end of the bracket; through holes are provided on the base plate at positions corresponding to the positioning grooves, and bolts pass through the positioning grooves and through holes to fix the left V-shaped iron to the base plate; the structure of the right V-shaped iron is the same as that of the left V-shaped iron.

3. The adjustable limiting device for crankshaft machining center holes according to claim 1, characterized in that: The angular positioning seat has a positioning pad at its upper end.

4. The adjustable limiting device for crankshaft machining center holes according to claim 1, characterized in that: The rear end of the axial positioning pin is provided with a handle and a handle pin that passes through the handle.

5. The adjustable limiting device for crankshaft machining center holes according to claim 1, characterized in that: The axial positioning seat is provided with a locking screw hole, and the locking screw passes through the locking screw hole and abuts against the axial positioning pin.

6. The adjustable limiting device for crankshaft machining center holes according to claim 4, characterized in that: The inner diameter of the axial positioning seat has a tolerance grade of H7, the outer diameter of the axial positioning pin has a tolerance grade of g6, and the axial positioning pin is fitted with a clearance fit in the axial positioning seat.

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