JP4682393B2 - Gear backlash measurement device for engine balancer device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an engine balancer device.
[0002]
[Prior art]
In a vehicular engine, for example, an imbalance occurs in the rotational balance of the crankshaft due to a secondary inertia force generated by a reciprocating motion of the piston in the vertical direction, and this causes a vertical vibration in the engine. For this reason, in the one disclosed in Japanese Patent Laid-Open No. 4-347032, two balancer shafts provided with eccentric balance weights are rotatably held in a case to form an assembly, and the balance shaft is connected to the crankshaft. It meshes directly through gears. The balance shaft is rotated in opposite directions by the rotational force of the crankshaft to suppress engine vibration. Since the balancer device is generally driven at twice the engine speed, noise generated from the gear due to backlash cannot be ignored.
[0003]
[Problems to be solved by the invention]
Therefore, an object of the present invention is to measure and adjust the backlash between the gears of the engine balancer device with high accuracy.
[0004]
Technical means for solving the above technical problems include a crankshaft supported by an engine block, a first gear provided on the crankshaft so as to rotate integrally with the crankshaft, and the first gear. A second gear; a first balancer shaft that rotates integrally with the second gear; a third gear provided on the first balancer shaft; a fourth gear that meshes with the third gear; and the fourth gear. A rotating second balancer shaft, balance weights respectively provided on the first balancer shaft and the second balancer shaft, a balancer case housing the first balancer shaft and the second balancer shaft, and the balancer case; A plurality of rotary bearings provided to support the first balancer shaft and the second balancer shaft A measuring method used in an engine balancer device comprising: the first balancer shaft and the second balancer shaft in the axial direction of the first balancer shaft and the second balancer shaft. A first jig installed on a portion located on one side of one of the shafts, a rotation amount measuring means engaged with the first jig, and on the other side of the one shaft in the axial direction. A second jig installed at a position where the first jig and the rotation amount measuring means side and the second jig side are balanced with the rotation support portion as a fulcrum. This is a measurement method for measuring backlash between each of the first gear to the fourth gear. Alternatively, a crankshaft supported by the engine block, a first gear provided on the crankshaft so as to rotate integrally with the crankshaft, a second gear meshing with the first gear, and rotating integrally with the second gear A first balancer shaft, a third gear provided on the first balancer shaft, a fourth gear meshing with the third gear, a second balancer shaft rotating integrally with the fourth gear, and the first balancer A balance weight provided on each of the shaft and the second balancer shaft; a balancer case for housing the first balancer shaft and the second balancer shaft; and the first balancer shaft and the second balancer case provided in the balancer case. A balancer device for an engine having a plurality of rotary bearings for supporting the balancer shaft A measuring device for measuring backlash between each of the first gear to the fourth gear, wherein the measuring device is arranged in the axial direction of the first balancer shaft and the second balancer shaft; A first jig installed in a portion located on one side of one of the first balancer shaft and the second balancer shaft; a rotation amount measuring means engaged with the first jig; and the shaft And a second jig installed on a portion located on the other side of the one shaft in the direction, the weight of the first jig and the rotation amount measuring means, and the second jig Is a measuring device for the backlash between the gears of the balancer device of the engine, which is constructed so as to have a weight that balances with the rotary support portion as a fulcrum.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of an engine balancer device according to the present invention will be described with reference to the drawings. 1 and 2, the cylinder block 11 of the engine is manufactured using a material having a high coefficient of thermal expansion such as an aluminum-based material. A crankshaft 12 is rotatably supported on the cylinder block 11 via a bearing (not shown). A piston (not shown) is engaged with the crankshaft 12 via a connecting rod (not shown). An opening 14 is formed on the lower surface of the cylinder block 11, and the first gear 13 is disposed on the crankshaft 12 in the opening 14.
[0006]
The case 24 has a hollow portion 25, and supports the drive shaft 22 and the driven shaft 23 constituting the balancer shaft in parallel and rotatably via the support portions 28, 29, 30, 31. Both ends 22a, 22b, 23a, 23b of both shafts protrude from the case 24 (FIGS. 2 and 3). Oil is forcibly supplied to the support portions 28 to 31 through an oil supply passage (not shown). Also, semi-cylindrical balance weights 26 and 27 are integrally formed in the center of each of the shafts 22 and 23, and the balance weights 26 and 27 rotate within the hollow portion 25. The balance weights 26 and 27 can be molded separately from the shaft and fastened to the shaft with bolts or the like. Third and fourth gears 32 and 33 that mesh with each other are fixed on the balancer shafts 22 and 23, and the shafts 22 and 23 rotate in opposite directions. The meshing positions of the gears 32 and 33 are determined so that the balance weights 26 and 27 can face each other by the rotation of the balancer shafts 22 and 23. A second gear 34 is further disposed on the balancer shaft 22 and meshes with the first gear 13 of the crankshaft. These gears 32, 33, and 34 are not located between the support portions 28 and 30 and between the support portions 29 and 31, but are arranged outside the support portions 28 and 29, so that they are in a so-called one-sided state. Yes.
[0007]
The case 24 is fixed to the plate-like attachment portion 17 of the intermediate member via a bolt 18 via its upper end surface. The balancer case 24 attached to the intermediate member attaching portion 17 is fixed to the cylinder block 11 of the engine via the intermediate member columnar portion 15 and the bolt 19. The front end of the bolt 19 passes through the columnar portion 15 of the intermediate member and is screwed into the lower end surface of the cylinder block 11. The intermediate members 15 and 17 are manufactured using a material having a small coefficient of thermal expansion, such as an iron-based material. The case 24 is disposed inside an oil pan (not shown) of the engine.
[0008]
A plurality of assemblies of the shaft 22 and the gear 32 and a plurality of assemblies of the shaft 23 and the gear 33 are prepared. Before assembling each assembly to the case 24, the backlash between the gears 32 and 33 is measured in advance by an appropriate method, and the optimum assembly pair is assembled to the case 24. However, it is conceivable that an error factor generated at the time of assembly deteriorates backlash that should be optimal.
[0009]
Therefore, the backlash between the gears of the assembled balancer device is measured and adjusted as follows using the measuring device shown in FIG. In FIG. 3, the intermediate member is not yet attached to the case 24. First, the drive shaft 22 is fixed so as not to rotate using a jig (not shown). A jig (first jig) 70 is integrally fixed to one end 23a of the driven shaft 23 via a screw 70d, and a jig (second jig) 71 as shown in FIG. It is fixed integrally through the screw 71c. In FIG. 4, the jig 71 has extending portions 71a and 71b extending on both sides in the radial direction, and a screw 71c is engaged with a part thereof. The weight of the jig 71 itself is determined as follows. That is, the sum of the weights of the gear 33, a part of the shaft 23, and the jig 70 which are positioned on the outer side (left side in FIG. 2) from the support part 29 and the outer side (right side in FIG. 2) from the support part 31. The part of the shaft 23 located at the center of the jig 71 and the sum of the weights of the jig 71 are balanced. As a result, the shaft 23 is supported on the support portions 29 and 31 in a stable state without inclination.
[0010]
The jig 70 also has a functionally similar structure to the jig 71, and includes extending portions 70a and 70b, screws 70c, and an output portion 70d extending in both radial directions. The output unit 70d is a plate-like member extending in a direction perpendicular to the paper surface in FIG. A lever type dial gauge (rotation amount measuring means) 74 is fixed on the magnet stand 75, and the tip of the lever part engages with the output part 70 d of the jig 70. When the above measurement preparation is completed, the weights 72 and 73 having the same mass are placed on the extending portions 70a and 71a of the jigs 70 and 71, respectively, and the shaft 23 rotates. read. Then, the weights 72 and 73 are placed on the extending portions 70b and 71b of the jigs 70 and 71, respectively, and the shaft 23 rotates in the reverse direction. Therefore, the indication value B is read using the dial gauge 74. The difference between the indicated values A and B can be measured as the amount of rotation of the shaft 23, that is, the backlash between the gears 32 and 33. When the backlash amount exceeds the specified amount, the assembly of the other shaft 23 and gear 33 is assembled to the case 24 to obtain the optimum backlash amount. The backlash amount is, for example, about 0 to 100 microns (at room temperature).
[0011]
Similarly, the backlash between the first gear 13 and the second gear 34 can also be measured. A shim (not shown) having a predetermined thickness is sandwiched between the intermediate members 15 and 17 and the case 24. This shim is prepared in various thicknesses. Now, the backlash is measured and adjusted as follows using the measuring apparatus shown in FIG. First, the driven shaft 23 is fixed to be non-rotatable using a jig (not shown). A jig (first jig) 80 is integrally fixed to one end 22a of the drive shaft 22 via its screw 80d, and a jig (first jig) having the same structure as the jig 71 as shown in FIG. (2 jig) 81 is fixed integrally through a screw (not shown). The jig 81 also has extending portions 81a and 81b extending on both sides in the radial direction, and a screw is engaged with a part thereof. The weight of the jig 81 itself is determined as follows. That is, the sum of the weights of the gear 32, the first gear 34, a part of the shaft 22, and the jig 80 that are positioned on the outside (left side in FIG. 2) from the support portion 28 and the outside of the support portion 30. It seems that a part of the shaft 22 located on the right side of FIG. 2 and the sum of the weights of the jig 81 are balanced. As a result, the shaft 22 is supported on the support portions 28 and 30 in a stable state without inclination.
[0012]
The jig 80 also has a functionally similar structure to the jig 81, and includes extending portions 80a and 80b, screws 80c, and an output portion 80d extending in both radial directions. The output unit 80d is a plate-like member extending in a direction perpendicular to the paper surface in FIG. The lever type dial gauge 74 is fixed on the magnet stand 75, and the tip of the lever part is engaged with the output part 80 d of the jig 70. When the above measurement preparations are completed, the weights 72 and 73 having the same mass are placed on the extending portions 80a and 81a of the jigs 80 and 81, respectively, and the shaft 22 rotates. Therefore, the indication value A2 is obtained using the dial gauge 74. read. Then, the weights 72 and 73 are placed on the extending portions 80b and 81b of the jigs 80 and 81, respectively, and the shaft 22 rotates in the reverse direction, so that the indicated value B2 is read using the dial gauge 74. The difference between the indicated values A2 and B2 can be measured as the amount of rotation of the shaft 22, that is, the backlash between the first gear 13 and the second gear 34. When the backlash amount exceeds the specified amount, the distance between the shafts between the crankshaft 12 and the drive shaft 22 is changed by changing the thickness of the shim sandwiched between the intermediate members 15 and 17 and the case 24. Can adjust the amount of backlash to the optimum value. The backlash amount is, for example, about 0 to 100 microns (at room temperature).
[0013]
【The invention's effect】
According to the first aspect of the present invention, since the second jig is disposed and the weights of both sides of the support portion are the same for each balancer shaft, the gear is cantilevered outside the support portion. As a result, the weight balance is achieved and the tilt of the shaft, which is often found in cantilever types, can be eliminated. In this state, the backlash can be measured with high accuracy, and the noise caused by the backlash can be reduced by adjusting.
[Brief description of the drawings]
FIG. 1 is a side view of a balancer device for an engine according to an embodiment of the present invention.
FIG. 2 is a view taken along arrow 2-2 in FIG.
3 is a configuration diagram of an inter-gear backlash measuring device of the balancer device of FIG. 1. FIG.
4 is a perspective view of a jig 70 in FIG. 3. FIG.
FIG. 5 is a configuration diagram when a measuring device similar to FIG. 3 is applied to another shaft.
[Explanation of symbols]
11 ... Engine block 12 ... Crankshaft 13 ... First gears 26, 27 ... Balance weights 22, 23 ... Balancer shaft 24 ... Balancer cases 28, 29, 30, 31 ... · Bearing 32 ··· Third gear 33 ··· Fourth gear 34 ··· Second gear 70 and 80 · · · First jig 71 and 81 · · · Second jig

Claims (2)

A crankshaft supported by the engine block ;
A first gear provided on the crankshaft so as to rotate integrally with the crankshaft;
A second gear meshing with the first gear;
A first balancer shaft that rotates integrally with the second gear;
A third gear provided on the first balancer shaft;
A fourth gear meshing with the third gear;
A second balancer shaft that rotates integrally with the fourth gear;
Balance weights respectively provided on the first balancer shaft and the second balancer shaft;
A balancer case that houses the first balancer shaft and the second balancer shaft;
A measuring method used in an engine balancer device provided on the balancer case, and comprising a plurality of rotating support portions for supporting the first balancer shaft and the second balancer shaft;
In the measurement method, the first balancer shaft and the second balancer shaft are installed in a portion located on one side of one of the first balancer shaft and the second balancer shaft in the axial direction of the first balancer shaft and the second balancer shaft. 1 jig,
A rotation amount measuring means for engaging with the first jig;
In the axial direction, using a second jig installed in a portion located on the other side of the one shaft,
Backlash between each gear of the first gear to the fourth gear in a state where the first jig and the rotation amount measuring means side and the second jig side are balanced with the rotation support portion as a fulcrum. Measuring method of backlash between gears of engine balancer device to be measured. A crankshaft supported by the engine block;
A first gear provided on the crankshaft so as to rotate integrally with the crankshaft;
A second gear meshing with the first gear;
A first balancer shaft that rotates integrally with the second gear;
A third gear provided on the first balancer shaft;
A fourth gear meshing with the third gear;
A second balancer shaft that rotates integrally with the fourth gear;
Balance weights respectively provided on the first balancer shaft and the second balancer shaft;
A balancer case that houses the first balancer shaft and the second balancer shaft;
A plurality of rotation support portions provided on the balancer case and supporting the first balancer shaft and the second balancer shaft; and each of the first gear to the fourth gear. A measuring device for measuring backlash between gears,
The measuring device is installed in a portion located on one side of one of the first balancer shaft and the second balancer shaft in the axial direction of the first balancer shaft and the second balancer shaft. 1 jig,
A rotation amount measuring means for engaging with the first jig;
A second jig installed on a portion located on the other side of the one shaft in the axial direction, and
The backlash between the gears of the balancer device of the engine configured such that the weight of the first jig and the rotation amount measuring means and the weight of the second jig are balanced with the rotation support portion as a fulcrum. Measuring device.

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