JPH0617844B2 - Unbalance tester - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention is modified to measure the unbalance of a test rotor such as a crankshaft, and balance the test rotor based on the measurement result. The present invention relates to an unbalance tester that indicates a direction and an amount.

<Prior Art> For example, in balancing a three-cylinder crankshaft, generally, a front view is shown in FIG. 2 and FIGS.
As shown in the enlarged views of A-A, B-B, and C-C in (C), it is equivalent to a connecting rod being attached to the connecting portion of the connecting rod during assembly, that is, each crank pin P _{1 to} P _3. a weight adding dummy weights D ₁ to D ₃ with, from unbalance signals obtained by rotating in this state, the left and right crankshaft counterweight W _L, the modified surface of the right and left set on the W _R Is calculated, and the unbalance vector on each of the correction surfaces is further divided into component force axes L ₁ and L ₂ set for the respective unbalance vectors.
Dynamic balancing is performed by breaking down into component force vectors on R ₁ and R ₂ and performing drilling or the like on each component force axis according to the magnitude of the component force vector.

<Problems to be Solved by the Invention> By the way, in such a crankshaft, normally, in the forging step, the unbalance vector is a correctable direction of each counterweight in consideration of the weights of the dummy weights D _{1 to} D ₃ . That is, it is devised so as to enter between L _{1 and} L _{2 and} between R _{1 and} R ₂ , but in some cases, it may deviate from that direction for some reason. In addition, the residual unbalance after the primary correction may deviate from that direction.

In the conventional dynamic balance testing machine, such a crankshaft cannot be balanced and corrected and cannot be commercialized.

An object of the present invention is to provide an unbalance tester capable of balancing a test piece such as a crankshaft having an unbalance vector deviating from the correctable direction.

<Means for Solving Problems> The principle of the present invention is that (a) the purpose of balancing crankshafts and the like is mainly to reduce the occurrence of vibration during use, and the effect on this vibration is more than that of even-unbalanced. The balance between static and imbalance is greater, and, as mentioned above, (b)
In the forging process, the crankshaft is designed so that its unbalance vector fits within the correctable direction on each counterweight, and even if the unbalance vector deviating from this direction is measured, its size is usually small, This is also due to the fact that the unbalance vector that deviates from the correctable direction at the time of the secondary correction is an unbalance that remains at the primary correction, and thus its magnitude is also small. That is, even if there is some even imbalance, even if the static imbalance is almost completely generated, vibration is small even if the crankshaft is commercialized. Therefore, in the present invention, it is an embodiment drawing. As shown in FIG. 1, a discriminating circuit for discriminating whether or not the unbalance vectors on the left and right correction surfaces obtained by the dynamic equilibrium test are within the correctable angular range on each correction surface (component force value positive / negative determination). Circuits 6L and 6R) and an unbalance vector composition circuit 7 that combines the unbalance vectors on the left and right correction surfaces to form a static (on one surface) unbalance vector. Only if at least one of the above unbalance vectors is out of the correctable angular range, the measurement result of the dynamic balance test is converted into a static unbalance vector, It is characterized by being configured as capable of performing balancing.

<Operation> An angle range in which the unbalance vector on each correction surface can be corrected, that is, L _{1 in} FIGS. 3A and 3C.
Between -L _2, when in between R ₁ -R ₂ are not dynamically balanced on the basis of conventional measurement result, if at least one is out of that range, by balancing statically, For the reasons (a) and (b) described above, it was possible to fully commercialize the product, and it became possible to remedy what was previously discarded as a defective product.

<Examples> Examples of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of the embodiment of the present invention.

The test piece is supported by the left and right bearings 1L and 1R and is given rotation. The unbalance signal generated by this rotation is
It is detected by detectors 2L and 2R provided in the bearings 1L and 1R. Further, the rotation reference phase signal of the sample is detected by detecting the mark or the like attached to the sample by the photocell 3.

The outputs of the detectors 2L and 2R are introduced into the correction surface separation circuit 4, and are converted into unbalanced signals on the left and right correction surfaces set on the left and right counterweights of the crankshaft, which is the sample, in advance, and the left and right of the next stage. component force arithmetic circuit 5L, a 5R, is decomposed into respective counter force component axis _L 1, which is set on the weight, _{L 2} and _R 1, a component force vector _L1 on _{R 2, L2} and _{R1, R2.} Up to this point, it is known.

Each component force vector obtained as described above is sent to the left and right component force value positive / negative discrimination circuits 6L and 6R, respectively, and the positive / negative discrimination is performed. Where _L1 , _L2 and
The fact that the values of the component force vectors of _R1 and _R2 are positive means that the unbalance vectors _{L 1} and _{R 2} on the left and right correction surfaces are L and _L , respectively, as shown in FIGS. 4 (A) and 4 (B).
₁ -L ₂ and _R 1 -R ₂ in time, which means that it is possible to dynamic balancing of the conventional, _L1, based on the _L2 and _{R1, R2} modifications to this case left and right modified surface, i.e. 2 An instruction for surface correction is given. _If any one of the component force vectors of _L1 , _L2 and _R1 , _R2 has a negative value, for example, if a component force vector as shown in FIGS. 5A and 5B is obtained, _R1 Is negative, the unbalance vector _R on the right correction surface is not between R _{1 and} R ₂ in the conventional device, and therefore the right surface cannot be corrected. In such a case, the unbalance vector synthesizing circuit 7 and the one-plane unbalance component force calculating circuit 8 are automatically operated.

The unbalance vector synthesis circuit 7 calculates the unbalance vectors _{L 1} and _{R 2} on both the right and left correction planes as shown in FIG.
It is combined with an unbalance vector on any one surface. That is, the motion unbalance vectors _{L 1} and _{R 2} of the test piece are combined and converted into the static unbalance vector. The one-plane unbalanced component force calculation circuit 8 calculates this static unbalanced vector as a component force vector on the component force axes L ₁ , L ₂ , R ₁ , and R _2.
It is decomposed into ₁ and ₂ , but the static unbalance vector is the sixth
As shown in the figure, for example, when it is between the L ₁ and R ₂ axes,
₁ and ₂ are component force vectors on the L ₁ and R ₂ axes, respectively, and corrections on these axes are instructed. This fix is 1
Since it is a surface modification, it does not matter at all about the axial position of the specimen, and any modification may be made. Therefore, if ₁ is on the R ₂ axis on the left counterweight and ₂ is on the R ₂ axis on the right counterweight, drilling with a depth corresponding to each size will statically balance them. become. When this static balance is applied, the above-mentioned (a), (b)
Due to the reason, there is no trouble such as vibration generation in practical use, and it can be commercialized.

In the above embodiment, the unbalance vectors _{L 1} and _{R 2} on both the right and left correction surfaces are combined to obtain the static unbalance vector, which is decomposed into component force vectors ₁ and ₂ , as shown in FIG. As described above, when the measurement results as shown in FIGS. 5A and 5B are obtained, only the negative component force vector _R1 is combined with the component force vector _L1 on the L ₁ axis on the opposite side of 180 ° and corrected. Even if the surface is modified by _L1 + _{L2 and} only the right modified surface is modified by _R2 , static balancing can be achieved similarly, and the present invention is also realized by a circuit that realizes such an action. It is possible.

<Effect> As described above, according to the present invention, as a result of performing the dynamic equilibrium test and measuring the unbalance vector on both the left and right correction surfaces, the range in which at least one of the unbalance vectors can be corrected If it is out of the range, it is automatically discriminated and one side is corrected, that is, it is switched to static balance, so it is impossible to correct by the conventional dynamic balance test and it is possible to correct the balance on the test piece as well. Especially, the crankshaft and the like can be sufficiently commercialized even by such modification, and most of the crankshafts can be salvaged from disposal.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of the embodiment of the present invention, and FIG.
3 and 4 are explanatory views of balancing of a three-cylinder crankshaft, FIGS. 4, 5, and 6 are explanatory views of the operation of an embodiment of the present invention, and FIG. 7 is another embodiment of the present invention. FIG. 1L, 1R ... Bearing, 2L, 2R ... Detector 3 ... Photo cell, 4 ... Corrected surface separation circuit 5L, 5R ... Component force calculation circuit 6L, 6R ... Component force value positive / negative discriminating circuit 7 ... Unbalance vector synthesis circuit 8 …… One-side unbalance component force calculation circuit

Claims (1)

[Claims] 1. A discriminating circuit for discriminating whether or not the unbalance vectors on the left and right correction surfaces on the specimen, which are obtained by the dynamic equilibrium test, are within the correctable angular range on each correction surface, and The unbalance vector on both the left and right modified surfaces is combined with the unbalance vector on one surface by combining the unbalance vectors on both the left and right modified surfaces. Is configured to be able to statically balance the test piece based on the unbalance vector on one surface by the unbalance vector composition circuit only when at least one of the two is outside the modifiable angle range, Unbalanced testing machine.