Novel crankshaft balance block deformation testing fixture

Abstract

The utility model discloses a novel crankshaft balance block deformation testing fixture which comprises a testing fixture body. The testing fixture body is an I-shaped plate; a positioning hole is formed in the middle of the testing fixture body, and the positioning hole is matched with a middle balance block of a standard crankshaft forge piece in position and size; a plurality of measuring holes are formed in the two ends of the testing fixture body, the positions of the measuring holes correspond to the positions of balance blocks at the two ends of the standard crankshaft forge piece, and the size of the measuring holes is equal to the sum of the size of the corresponding balance blocks of the standard crankshaft forge piece and a tolerance limit value. The detection tool provided by the utility model is simpler in structure, faster in operation and use, higher in detection work efficiency, capable of rapidly detecting whether the crankshaft forge piece balance block is deformed and out of tolerance, and suitable for large-scale forge piece detection work.

Description

Technical Field

[0001] The utility model belongs to the technical field of inspection tools for crankshaft forgings, and particularly relates to a new type of inspection tool for the deformation of the balance weight of a crankshaft. Background Art

[0002] With the development of technology, the automotive industry has become increasingly strict in cost control. As a core component of the engine, the crankshaft has higher requirements for the machining allowance and dimensional accuracy of forgings. Among them, the deformation of the balance weight of the crankshaft forging will lead to problems such as insufficient machining allowance of the crankshaft and inability to remove weight during dynamic balancing, resulting in product scrapping. Even serious leakage failures will cause serious consequences such as interference between the crankshaft and the engine cylinder block. For these reasons, some devices for detecting the deformation of the balance weight of crankshaft forgings have been proposed.

[0003] For example, Chinese Patent Application No. 202223234580.X discloses an inspection tool for the deformation of the balance weight of a crankshaft forging, which includes a workbench, two detection seats, and a crankshaft support assembly. A slide rail is arranged on the top surface of the workbench in the left-right direction. The crankshaft support assembly is deployed in the middle of the workbench. The crankshaft support assembly includes a V-shaped support and a horizontal support platform. There are two V-shaped supports, which are deployed at intervals in the front-rear direction. The horizontal support platform is deployed on the workbench between the two V-shaped supports. The two detection seats are respectively deployed on the slide rails on the left and right sides of the crankshaft support assembly. The detection seat includes a seat body and a detection block installed on the seat body. The seat body is slidably installed on the slide rail. The detection block is provided with two vertical grooves in parallel. The openings of the grooves all face the middle of the workbench. There are 4 detection convex teeth on the two side walls of the groove. One detection convex tooth is arranged at intervals up and down on each side wall. The detection convex teeth on the two side walls are symmetrically deployed. The distance between the tops of the two detection convex teeth corresponding to the two side walls is the maximum thickness designed for the corresponding tip position of the balance weight. The four vertical grooves of the detection seat correspond to the positions of the four balance weights of the crankshaft forging, and a reference groove is provided. A positioning and centering device is arranged in the reference groove. The positioning and centering device includes two guiding blocks respectively arranged on the two side walls. The two guiding blocks are deployed at intervals in the up-down direction. The guiding blocks gradually become thinner towards the opening direction of the groove, and their top surfaces form guiding inclined surfaces inclined relative to the side walls. When inspecting the crankshaft forging, the crankshaft forging is placed horizontally. Its main journal is supported by the two V-shaped supports, and the horizontal support platform supports a connecting rod journal. The parting surface of the balance weight opposite to the reference groove is in a horizontal state. When the detection seat is pushed towards the crankshaft forging, if the balance weight of the crankshaft forging is qualified, the guiding inclined surfaces of the two guiding blocks respectively abut against the front and rear sides of the outer circle of the balance weight above and below the parting surface, and at the same time, the detection convex teeth in all the grooves can pass through the two tips of the balance weight.

[0004] For another example, Chinese Patent Application No. 201620993350.7 discloses a screening tool for a crankshaft blank, which includes a V-shaped support block and a screening plate. In the middle of the upper side of the screening plate, upper screening notches are provided, the number and positions of which are the same as those of the balance blocks in the middle of the crankshaft blank. At both ends of the upper side, upper avoidance notches are provided. At both ends of the lower side of the screening plate, lower screening notches are provided, the number and positions of which are the same as those of the balance blocks at both ends of the crankshaft blank. In the middle of the lower side, a lower avoidance opening is provided. The slopes of the upper and lower screening notches are the same as the draft angles of the balance blocks. The lengths of the upper and lower screening notches are the maximum limit values of the distances from the ends of the balance blocks to the parting line. The widths of the bottoms of the upper and lower screening notches are the maximum limit values of the thicknesses of the balance blocks. At the openings of the upper and lower screening notches, flash avoidance notches for avoiding the flashes of the balance blocks are provided. This screening tool can quickly screen whether there are problems such as out-of-tolerance axial dimensions or deformed balance blocks in the crankshaft blank, improving work efficiency. Summary of the Utility Model

[0005] The purpose of the present utility model is to provide a new type of crankshaft balance block deformation inspection tool with a simpler structure, faster operation, and higher inspection work efficiency.

[0006] To achieve the above purpose, the present utility model adopts the following technical solutions:

[0007] A new type of crankshaft balance block deformation inspection tool includes an inspection body; the inspection body is an I-shaped plate; a positioning hole is provided in the middle of the inspection body, and the position and size of the positioning hole match those of the middle balance block of the standard crankshaft forging; several measuring holes are provided at both ends of the inspection body, and the positions of the measuring holes correspond to the positions of the balance blocks at both ends of the standard crankshaft forging, and the size of the measuring hole is equal to the size of the corresponding balance block of the standard crankshaft forging plus the tolerance limit value.

[0008] In the present utility model, for the convenience of taking and using, the inspection body is designed in the form of an I-shaped single plate. A positioning hole and measuring holes are designed on this single plate. Among them, two balance blocks that are not easily deformed at the center of the crankshaft are selected as the positioning reference for the positioning hole. Therefore, the gaps between the two long sides of the positioning hole and the crankshaft forging should be designed to be small, usually less than 20% of the tolerance range. To ensure the measurement accuracy, usually the gap between the long side of the measuring hole and the crankshaft forging is designed to be within 80% of the tolerance range. During inspection, if the tips of the balance blocks of the crankshaft forging cannot enter the positioning hole and the measuring hole designed in the template at the same time, the balance blocks of the measured crankshaft forging are unqualified in terms of deformation; on the contrary, if they can enter at the same time, they are qualified.

[0009] The present utility model further explains that two groups of measuring holes are provided on the inspection body with the axial center line of the positioning hole as the mirror symmetry line. For extending the service life of the inspection tool and for the convenience of use, the measuring holes are designed with two symmetrical upper and lower groups, and either group can be used for quick measurement during use.

[0010] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0011] Compared with the prior art (such as CN202223234580.X and 201620993350.7), the fixture structure of the present utility model is simpler, the operation and use are faster, the detection work efficiency is higher, and it can quickly detect whether the balance blocks of the crankshaft forgings are deformed and out of tolerance, and is suitable for mass forging detection operations. Brief Description of the Drawings

[0012] Figure 1 It is a schematic structural diagram of an embodiment of the present utility model.

[0013] Figure 2 It is a schematic structural diagram of an embodiment of the present utility model during the detection operation.

[0014] Figure 3 It is Figure 2 front view of

[0015] Reference numerals: 1 - fixture body, 101 - positioning hole, 102 - measuring hole; A - axial center line of the positioning hole. Detailed Embodiments

[0016] The present utility model will be further described below with reference to the drawings.

[0017] Embodiment 1: A new type of crankshaft balance block deformation fixture, including a fixture body 1; as Figure 1 shown, the fixture body 1 is an I-shaped plate; a positioning hole 101 is provided in the middle of the fixture body 1, and the position and size of the positioning hole 101 match the position and size of the middle balance block of the standard crankshaft forging; measuring holes 102 are provided at both ends of the fixture body 1, and the positions of the measuring holes 102 correspond to the positions of the balance blocks at both ends of the standard crankshaft forging, and the size of the measuring hole 102 is equal to the size of the corresponding balance block of the standard crankshaft forging plus the tolerance limit value.

[0018] In the embodiment, two balance blocks that are not easily deformed at the center of the crankshaft are selected as the positioning reference for the positioning hole 101. Therefore, the gaps between the two long sides of the positioning hole 101 and the crankshaft forging should be designed to be small, usually less than 20% of the tolerance range. To ensure the measurement accuracy, the gap between the long side of the measuring hole 102 and the crankshaft forging is usually designed to be within 80% of the tolerance range.

[0019] During the detection, if the tips of the balance blocks of the crankshaft forging cannot enter the positioning hole and the measuring hole designed in the template at the same time, the balance blocks of the measured crankshaft forging are deformed and unqualified; otherwise, if they can enter at the same time, they are qualified.

[0020] Embodiment 2: The difference between this embodiment and Embodiment 1 is only that: asFigure 1 As shown, two groups of measuring holes 102 are arranged on the inspection body 1 with the axial center line of the positioning hole 101 as the mirror symmetry line.

[0021] The working state is as Figure 2 and Figure 3 shown. During measurement, the positioning hole 101 of the inspection body 1 and any one group of measuring holes 102 (a total of four holes) are aligned with the tip of the balance weight of the crankshaft forging. When the tips of the balance weights of the crankshaft forging cannot enter the positioning hole 101 and the measuring holes 102 designed on the inspection body 1 simultaneously, it is determined that the balance weight of the measured crankshaft forging is deformed and unqualified; on the contrary, if it can enter simultaneously, it is determined to be qualified.

[0022] Obviously, the above embodiments are only examples for clearly explaining the present invention, rather than limitations on the implementation of the present invention. For those of ordinary skill in the art in the relevant technical field, other different forms of changes or modifications can be made based on the above description; it is not necessary and impossible to list all implementation manners here; and the obvious changes or modifications derived therefrom are still within the protection scope of the present invention.

Claims

1. A new type of crankshaft balance block deformation inspection tool, including an inspection body; characterized in that: The inspection body is an I-shaped plate; a positioning hole is provided in the middle of the inspection body, and the positioning hole matches the position and size of the middle balancing block of the standard crankshaft forging; a plurality of measuring holes are provided at both ends of the inspection body, and the positions of the measuring holes correspond to the positions of the balancing blocks at both ends of the standard crankshaft forging, and the size of the measuring holes is equal to the size of the corresponding balancing block of the standard crankshaft forging plus the tolerance limit value.

2. The new crankshaft balance block deformation inspection tool according to claim 1 is characterized in that: The inspection body is actually provided with two groups of measuring holes with the axial center line of the positioning hole as the mirror symmetry line.

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