Crankshaft precision assembling clamp

Abstract

The utility model relates to the technical field of crankshaft machining, in particular to a precise crankshaft assembling clamp which comprises a bottom plate, two first springs are arranged on the bottom plate, a first upper cover plate is arranged over the bottom plate, a guide sleeve and an upper working plate are fixedly arranged on the first upper cover plate, a guide column is arranged in the guide sleeve in a sliding mode, and a second upper cover plate is arranged on the upper working plate. A hydraulic clamp is arranged on the first upper cover plate, a lower sleeve block and a lower positioning mechanism are arranged on the bottom plate, sliding grooves are formed in the lower sleeve block and the upper working plate, second springs are arranged in the sliding grooves, positioning columns are arranged on the second springs, and a second upper cover plate is fixedly arranged on one side of the lower portion of the upper working plate. And a workpiece is arranged between the second upper cover plate and the lower sleeve block, so that the workpiece is convenient to take out.

Description

Technical Field

[0001] The utility model relates to the technical field of crankshaft processing, and particularly relates to a precision assembly fixture for a crankshaft. Background Technique

[0002] The crankshaft is one of the most important components in an engine. It undertakes the important task of converting the force transmitted by the connecting rod into torque and drives other accessories on the engine through the output of the crankshaft. The shape of the crankshaft is a long strip object, with the connecting rod connected to both ends. The central part is the main journal, which is used to bear pressure and rotational force, and the two ends are the connecting rod journals, which are used to connect the connecting rod. When assembling the crankshaft, a fixture is needed to fix it.

[0003] As disclosed in a Chinese patent: a crankshaft processing fixture, application number: CN201620388838.7, which includes a chuck, a fixture base and a chuck head. The chuck is installed on the machine tool spindle and is coaxial with the machine tool spindle. The fixture base is fixed at the front end of the chuck by screws. The fixture base is provided with a stepped mounting hole, which includes two parts. A thimble is provided at the rear end of the stepped mounting hole, and the front end of the stepped mounting hole serves as a crankshaft positioning hole. The thimble part of the thimble extends into the crankshaft positioning hole. The distance between the center line of the crankshaft positioning hole and the center line of the fixture base is equal to the eccentricity of the eccentric wheel. A keyway is provided on the front end face of the fixture base, and the center line of the keyway passes through the center of the fixture base. A convex key that cooperates with the keyway is provided at the rear end of the chuck head. A part of the crankshaft is inserted into the crankshaft positioning hole, and the chuck head is sleeved on the crankshaft and clamped by the cooperation of the convex key and the keyway.

[0004] However, in the above technical solution, the crankshaft is the most important component in the engine. It bears the force transmitted by the connecting rod, converts it into torque and outputs it through the crankshaft to drive other accessories on the engine. Therefore, the assembly of the crankshaft is a very important process. In the current pressing device, when pressing the crankshaft, due to the high requirement for pressing accuracy, the skill requirements for the operator are relatively high, which increases the pressing cost. Secondly, when pressing the crankshaft, the operator needs to maintain a highly concentrated and stable operation state for a long time to ensure the accuracy and safety of pressing, which increases the labor intensity. Content of the Utility Model

[0005] The main object of the present utility model is to provide a precision assembly fixture for a crankshaft, which can effectively solve the problems in the background technology. The crankshaft is the most important component in an engine. It bears the force transmitted by the connecting rod and converts it into torque, which is output through the crankshaft to drive other accessories on the engine. Therefore, the assembly of the crankshaft is a very important process. In the current press-fitting device, when press-fitting the crankshaft, due to the high requirements for press-fitting accuracy, the skills required for the operators are relatively high, which increases the press-fitting cost. Secondly, when press-fitting the crankshaft, the operator needs to maintain a highly concentrated and stable operating state for a long time to ensure the accuracy and safety of the press-fitting, which increases the labor intensity.

[0006] To achieve the above object, the technical solution adopted by the present utility model is as follows:

[0007] A precision assembly fixture for a crankshaft includes a bottom plate. Two first springs are arranged on the bottom plate. A first upper cover plate is arranged directly above the bottom plate. A guide sleeve and an upper working plate are fixedly arranged on the first upper cover plate. A guide post is slidably arranged in the guide sleeve. A hydraulic fixture is arranged on the first upper cover plate. A lower sleeve block and a lower positioning mechanism are arranged on the bottom plate. Chutes are arranged on the lower sleeve block and the upper working plate. A second spring is arranged in the chute. A positioning post is arranged on the second spring. A second upper cover plate is fixedly arranged on one side below the upper working plate. A workpiece is arranged between the second upper cover plate and the lower sleeve block.

[0008] Preferably, the guide post is fixedly connected to the bottom plate.

[0009] Preferably, the lower sleeve block is directly above the lower positioning mechanism.

[0010] Preferably, the chute on the upper working plate penetrates through the second upper cover plate.

[0011] Preferably, the lower positioning mechanism includes a mechanism base, and a groove is arranged on the mechanism base.

[0012] Preferably, a return spring is arranged in the groove, and a positioning pin is arranged on the return spring.

[0013] Compared with the prior art, the present utility model has the following beneficial effects:

[0014] (1) When the utility model is in use, first place the workpiece between the lower sleeve block and the second upper cover plate, then insert the crankshaft hole in the upper part of the workpiece into the hydraulic fixture, and align the crankpin hole on the workpiece with the positioning post above. At this time, the liquid is pressurized through the gap to form hydraulic pressure, so that the hydraulic fixture clamps the upper part of the workpiece. The lower part of the workpiece follows the same steps to meet the accuracy requirements of the position degree during the press-fitting of the workpiece and prevent the workpiece from accidentally falling. Subsequently, move the first upper cover plate downward to apply a load, and at the same time, the spring plays a buffering role to limit the load pressure and press down the workpiece. Due to the limit of the second springs on both sides, after the assembly is completed, when lifting upward, the hydraulic fixture is depressurized to release the workpiece, which is convenient for taking out. Description of the Drawings

[0015] Figure 1 is a schematic structural diagram of a precision assembly fixture for a crankshaft of the utility model;

[0016] Figure 2 is a schematic internal structural diagram of a precision assembly fixture for a crankshaft of the utility model;

[0017] Figure 3 is a schematic structural diagram of the lower positioning mechanism in a precision assembly fixture for a crankshaft of the utility model.

[0018] In the figure: 1, base plate; 2, first spring; 3, guide sleeve; 4, upper working plate; 5, first upper cover plate; 6, hydraulic fixture; 7, chute; 8, second upper cover plate; 9, positioning post; 10, lower sleeve block; 11, lower positioning mechanism; 1101, mechanism base; 1102, groove; 1103, spring; 1104, positioning pin; 12, workpiece; 13, second spring; 14, guide post. Specific Embodiments

[0019] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0020] Such as Figure 1 and Figure 2As shown in the figure, a precision assembly fixture for a crankshaft includes a bottom plate 1, and is characterized in that: two first springs 2 are arranged on the bottom plate 1, a first upper cover plate 5 is arranged directly above the bottom plate 1, a guide sleeve 3 and an upper working plate 4 are fixedly arranged on the first upper cover plate 5, a guide post 14 is slidably arranged in the guide sleeve 3, a hydraulic fixture 6 is arranged on the first upper cover plate 5, a lower sleeve block 10 and a lower positioning mechanism 11 are arranged on the bottom plate 1, a chute 7 is arranged on the lower sleeve block 10 and the upper working plate 4, a second spring 13 is arranged in the chute 7, a positioning post 9 is arranged on the second spring 13, a second upper cover plate 8 is fixedly arranged on one side below the upper working plate 4, and a workpiece 12 is arranged between the second upper cover plate 8 and the lower sleeve block 10.

[0021] As Figure 3 shown, in another embodiment of the present utility model, the lower positioning mechanism 11 includes a mechanism base 1101, and a groove 1102 is arranged on the mechanism base 1101;

[0022] A return spring 1103 is arranged in the groove 1102, and a positioning pin 1104 is arranged on the return spring 1103. When product pressing is required, the hole on the workpiece 12 is positioned by the positioning pin 1104 to meet the accuracy requirements of the position degree during the pressing of the workpiece 12. At the same time, when pressing the workpiece 12, the return spring 1103 will deform. After the pressing is completed, the return spring 1103 rebounds to make the positioning pin 1104 return to its original position, so as to quickly perform the next pressing.

[0023] The working principle of this precision assembly fixture for a crankshaft:

[0024] During use, first place the workpiece 12 between the lower sleeve block 10 and the second upper cover plate 8, then insert the upper part of the crankshaft hole on the workpiece 12 into the hydraulic fixture 6, and align the crank pin hole on the workpiece 12 with the upper positioning post 9. At this time, the liquid is pressurized through the gap to form hydraulic pressure, so that the hydraulic fixture 6 clamps the upper part of the workpiece 12. The lower part of the workpiece 12 is the same as the above steps to meet the accuracy requirements of the position degree during the pressing of the workpiece 12 and prevent the workpiece 12 from accidentally falling. Subsequently, move the first upper cover plate 5 downward to apply a load, and at the same time, the spring 2 plays a buffering role to limit the load pressure and press down the workpiece 12. Due to the limit of the two second springs 13, after the assembly is completed, when lifting upward, the hydraulic fixture 6 is depressurized instantly to release the workpiece 12, which is convenient for taking out.

[0025] Obviously, the above embodiments of the present utility model are merely examples for clearly illustrating the present invention, rather than limitations on the implementation manners of the present invention. For those of ordinary skill in the art, other different forms of changes or alterations can be made based on the above description. It is impossible to list all the implementation manners here. Any obvious changes or alterations derived from the technical solutions of the present invention still fall within the protection scope of the present invention.

Claims

1. A precision assembly fixture for a crankshaft, comprising a base plate (1), characterized in that: There are two first springs (2) provided on the bottom plate (1). A first upper cover plate (5) is provided directly above the bottom plate (1). A guide sleeve (3) and an upper working plate (4) are fixedly provided on the first upper cover plate (5). A guide post (14) is slidably arranged in the guide sleeve (3). A hydraulic fixture (6) is provided on the first upper cover plate (5). A lower sleeve block (10) and a lower positioning mechanism (11) are provided on the bottom plate (1). Chute grooves (7) are provided on the lower sleeve block (10) and the upper working plate (4). A second spring (13) is arranged in the chute groove (7). A positioning post (9) is arranged on the second spring (13). A second upper cover plate (8) is fixedly provided on one side below the upper working plate (4). A workpiece (12) is arranged between the second upper cover plate (8) and the lower sleeve block (10).

2. The precision assembly fixture for a crankshaft according to claim 1, wherein: The guide post (14) is fixedly connected to the bottom plate (1).

3. The precision assembly fixture for a crankshaft according to claim 2, wherein: The lower sleeve block (10) is located directly above the lower positioning mechanism (11).

4. The precision assembly fixture for a crankshaft according to claim 3, characterized in that: The chute groove (7) on the upper working plate (4) penetrates through the second upper cover plate (8).

5. The precision assembly fixture for a crankshaft according to claim 4, wherein: The lower positioning mechanism (11) includes a mechanism base (1101), and a groove (1102) is provided on the mechanism base (1101).

6. A precision assembly fixture for a crankshaft according to claim 5, characterized in that: A return spring (1103) is arranged in the groove (1102), and a positioning pin (1104) is arranged on the return spring (1103).

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