A crankshaft axis adjustment fixture

Abstract

The present invention provides a crankshaft axis adjustment fixture, which includes a body, an elastic tapered sleeve installed in the tapered hole of the body, and a calibration mandrel that cooperates with the elastic tapered sleeve. The elastic tapered sleeve is pressed by an adjusting ring and its axial position is adjusted by the adjusting ring. A locking sleeve for fixing the adjusting ring is provided on the body; the tapered hole of the body is eccentrically arranged relative to the outer circle of the body. The outer circle of the elastic tapered sleeve cooperates with the tapered hole of the body, and the inner hole of the elastic tapered sleeve is eccentrically arranged relative to the outer circle of the elastic tapered sleeve. Scale lines are provided on the outer end face of the elastic tapered sleeve, and scale marks are provided on the outer end face of the body; the outer circle of the working section of the calibration mandrel cooperates with the inner hole of the elastic tapered sleeve. The fixture provided by the present invention includes a combination of two eccentric parts inside and outside, realizing the adjustment and orientation of the eccentricity value, realizing the function of offsetting the axis line of the crankshaft, effectively improving the processing efficiency at the same time, avoiding the swing of the shaft section, and ensuring the processing accuracy.

Description

Technical Field

[0001] The invention belongs to the technical field of machining auxiliary tooling, and in particular relates to a crankshaft axis adjustment fixture. Background Art

[0002] The crankshaft is a key component of the engine. It is a special slender shaft part. It is easy to bend and deform during the processing. Severe bending and deformation will cause the crankshaft to be scrapped. In order to save this large deformation crankshaft, the position of the center hole at both ends of the crankshaft can be changed to change the position of the axis centerline, so as to achieve the purpose of making the crankshaft machining allowance tend to be evenly distributed. There are usually two methods to change the position of the center hole in the prior art: one is to change the position of the center hole by a center stand on a machining lathe. The other method is to change the position of the center hole by marking. For the first method, since the support position of the center stand determines the change in the coordinate size of the center hole position, the closer the center is to the middle part of the crankshaft, the better the correction effect of the center hole, but it follows that the distance between the center stand and the shaft end becomes larger, and the shaft end will swing during turning, making it difficult to perform precise processing. Therefore, the position of the center stand can only be supported on the last main journal, which results in little change in the position of the axis centerline of the crankshaft and little effect on the average machining allowance. After the position of the center hole is changed by the second scribing method, it cannot be processed on a lathe, but can only be processed on a machining center. Each time a center hole is processed, the coordinates must be aligned, which is very cumbersome. Therefore, the traditional method according to the prior art can no longer meet the process requirements, and the processing efficiency is also low. Summary of the invention

[0003] In view of this, the present invention aims to overcome the defects in the prior art and proposes a crankshaft axis adjustment fixture.

[0004] To achieve the above object, the technical solution created by the present invention is implemented as follows:

[0005] A crankshaft axis adjustment fixture comprises a body, an elastic taper sleeve installed in a tapered hole of the body, and a calibration core shaft matched with the elastic taper sleeve, the elastic taper sleeve is pressed by an adjustment ring, and the axial position is adjusted by the adjustment ring, and a locking sleeve for fixing the adjustment ring is provided on the body; the tapered hole of the body is eccentrically arranged relative to the outer circle of the body, the outer circle of the elastic taper sleeve is matched with the tapered hole of the body, and the inner hole of the elastic taper sleeve is eccentrically arranged relative to the outer circle of the elastic taper sleeve, a scale line is provided on the outer end face of the elastic taper sleeve, and a scale mark is provided on the outer end face of the body; the outer circle of the working section of the calibration core shaft is matched with the inner hole of the elastic taper sleeve.

[0006] Furthermore, a plurality of adjustment slots are provided at one end of the elastic cone sleeve facing outward.

[0007] Furthermore, at least one fixing hole is provided on the outer circumference of the main body.

[0008] Further, the outer circumference of the locking sleeve is knurled.

[0009] Further, several connecting holes are provided on the outer circumferential surface of the locking sleeve.

[0010] Further, several process holes are provided at one end of the adjusting ring extending out of the locking sleeve.

[0011] Further, the process holes are evenly distributed along the outer circumference of the adjusting ring.

[0012] Further, operating sections are respectively provided on both sides of the working section of the alignment mandrel, the operating sections extend out of the body, and the outer surfaces of the operating sections are knurled.

[0013] Compared with the prior art, the present invention has the following advantages:

[0014] The fixture provided by the present invention includes a combination of two eccentric parts inside and outside, forming a continuous and non-spaced eccentricity value. The eccentricity value and the eccentricity direction are kept consistent by using engraved lines. An elastic cone sleeve is used to fix the fixture at the end of the crankshaft, and a unified machining reference is formed by the outer circle, realizing the adjustment and orientation of the eccentricity value, realizing the function of offsetting the axis line of the crankshaft, effectively improving the machining efficiency at the same time, avoiding the swing of the shaft section, and ensuring the machining accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments and descriptions of the present invention are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0016] Figure 1 is a schematic structural diagram of the present invention;

[0017] Figure 2 is a schematic diagram of the alignment shaft core in the present invention;

[0018] Figure 3 is Figure 1 a left view of

[0019] Figure 4 is a three-dimensional structural diagram of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other.

[0021] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings. These are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more.

[0022] In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, the terms "mounted", "connected", "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood through specific circumstances.

[0023] The present invention will be described in detail below with reference to the drawings and in conjunction with embodiments.

[0024] A crankshaft axis adjustment fixture, as Figures 1 to 4 shown, includes a body 1, an elastic cone sleeve 3 installed in the body taper hole 2, and a calibration mandrel 4 that cooperates with the elastic cone sleeve. The elastic cone sleeve is pressed by an adjusting ring 5 and its axial position is adjusted by the adjusting ring. A locking sleeve 7 for fixing the adjusting ring is provided on the body. The body taper hole is eccentrically arranged relative to the body outer circle. The outer circle of the elastic cone sleeve cooperates with the body taper hole, and the inner hole of the elastic cone sleeve is eccentrically arranged relative to the outer circle of the elastic cone sleeve. A scale line 8 for indicating the eccentricity value is provided on the outer end face of the elastic cone sleeve, and a scale mark 9 is provided on the outer end face of the body. The outer circle of the working section 6 of the calibration mandrel cooperates with the inner hole of the elastic cone sleeve.

[0025] Several adjusting slits 11 are provided at one end of the above-mentioned elastic cone sleeve facing the outside. After the elastic cone sleeve is tightened, it is deformed under pressure. At least one fixing hole 12 is provided on the outer circumference of the above-mentioned body. The outer circumference of the above-mentioned locking sleeve is knurled for convenient manual operation. Several connecting holes 14 are provided on the outer circumferential surface of the locking sleeve. Several process holes 13 are provided at one end of the above-mentioned adjusting ring extending out of the locking sleeve for convenient operation. Usually, the process holes are evenly distributed along the outer circumference of the adjusting ring.

[0026] In the case where the deformation of the induction-hardened crankshaft is relatively large and affects the subsequent machining allowance, this fixture is used to adjust the center line of the main shaft of the crankshaft. The adjustment amount is accurate, with an error less than 0.1 mm, fully meeting the process requirements. At the same time, the operation is convenient and efficient.

[0027] In an optional embodiment, operating sections 10 are respectively provided on both sides of the working section of the calibration mandrel. The operating sections protrude from the body, and knurling treatment is performed on the outer surface of the operating sections.

[0028] The inner hole of the body is an eccentric tapered hole. The center line of the tapered hole is offset by an offset e1 relative to the center line of the outer circle. The outer circle of the elastic tapered sleeve is a cone, and this cone cooperates with the eccentric tapered hole of the body; the inner hole part of the elastic tapered sleeve is dimensionally matched with the shaft end of the crankshaft. The inner hole is an eccentric hole, and the center line of the eccentric hole is offset by an offset e2 relative to the center line of the outer cone. By tightening the locking sleeve, the adjusting ring is deformed to hold the shaft end of the crankshaft tightly. When this fixture is fastened to the shaft end of the crankshaft, the adjusting ring presses the elastic tapered sleeve, and the elastic tapered sleeve can be adjusted by rotating the adjusting ring.

[0029] Before use, first measure the deformation of the crankshaft to determine the value and direction of the offset required for the center hole, and mark the direction on the shaft end of the crankshaft. Then use this fixture to determine the position. The specific operation is as follows: manually rotate the adjusting ring to align the eccentric value indicating scale line with the desired eccentric value, then put this fixture on the shaft end of the crankshaft, align the fixture scale line with the mark on the shaft end of the crankshaft, and rotate the locking sleeve to fix this fixture on the shaft end of the crankshaft.

[0030] During machining, taking the outer circle of the body of this fixture as the machining reference, it can be rotationally machined on a lathe or fixed for machining on a machining center. At the same time, during rotational machining, since the support position is close to the shaft end, the phenomenon of shaft end swing will not occur.

[0031] The fixture provided by this invention includes a combination of two eccentric parts inside and outside, forming a continuous and non-interval eccentric value. The eccentric value and the eccentric direction are kept consistent by using scale lines. The fixture is fixed to the shaft end of the crankshaft by using an elastic tapered sleeve, and a unified machining reference is formed with the outer circle, realizing the adjustment and orientation of the eccentric value, realizing the function of offsetting the axis line of the crankshaft, effectively improving the machining efficiency at the same time, avoiding shaft segment swing, and ensuring the machining accuracy.

[0032] The above are only the preferred embodiments of this invention and are not intended to limit this invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of this invention shall be included within the protection scope of this invention.

Claims

1. A crankshaft axis adjustment fixture, characterized in that: It includes a body, an elastic tapered sleeve installed in the tapered hole of the body, and a calibration mandrel that cooperates with the elastic tapered sleeve. The elastic tapered sleeve is pressed by an adjusting ring and its axial position is adjusted by the adjusting ring. A locking sleeve for fixing the adjusting ring is provided on the body; the tapered hole of the body is eccentrically arranged relative to the outer circle of the body. The outer circle of the elastic tapered sleeve cooperates with the tapered hole of the body, and the inner hole of the elastic tapered sleeve is eccentrically arranged relative to the outer circle of the elastic tapered sleeve. A scale line is provided on the outer end face of the elastic tapered sleeve, and a scale mark is provided on the outer end face of the body; the center line of the tapered hole of the body is eccentrically arranged relative to the center line of the outer circle of the body. The outer circle of the elastic tapered sleeve is a cone that cooperates with the eccentric tapered hole of the body; the inner hole part of the elastic tapered sleeve is dimensionally matched with the end of the crankshaft shaft. The center line of the inner hole of the elastic sleeve is eccentrically arranged relative to the center line of the outer cone; the outer circle of the working section of the calibration mandrel cooperates with the inner hole of the elastic tapered sleeve. Operating sections are provided on both sides of the working section of the calibration mandrel. The operating sections extend out of the body, and knurling treatment is performed on the outer surface of the operating sections.

2. The crankshaft axis adjustment fixture according to claim 1, characterized in that: Several adjusting slits are provided at one end of the elastic tapered sleeve facing the outside.

3. The crankshaft axis adjustment fixture according to claim 1, characterized in that: At least one fixing hole is provided on the outer circumference of the body.

4. The crankshaft axis adjustment fixture according to claim 1, characterized in that: Knurling treatment is performed on the outer circumference of the locking sleeve.

5. The crankshaft axis adjustment fixture according to claim 4, characterized in that: Several connecting holes are provided on the outer circumferential surface of the locking sleeve.

6. The crankshaft axis adjustment fixture according to claim 1, characterized in that: Several process holes are provided at one end of the adjusting ring that extends out of the locking sleeve.

7. The crankshaft axis adjustment fixture according to claim 6, characterized in that: The process holes are evenly distributed along the outer circumference of the adjusting ring.

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