JP3086356B2 - How to assemble double scissors gear - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scissors gear used for preventing backlash and rattling due to backlash.

[0002]

2. Description of the Related Art Conventionally, for example, it has been used in a constant meshing portion of a gear device in an automobile engine or the like.
A scissors gear with a configuration in which a sub-gear with a number of teeth is attached, a torsional force is imparted by a spring in the rotating direction, and the opposing gear is bitten, and the opposing tooth is sandwiched between the main gear and the sub-gear by the reaction force of the spring. Have been. In such a scissors gear, when the main gear and the sub-gear are not flush with each other when the gear is mounted on the gear device, the sub-gear may become an obstacle and the assembling may not be possible. Normally, when assembling the main gear and the sub-gear, a dedicated jig is pressed against the tooth groove, the tooth traces of the respective gears are aligned, and the set bolts are tightened. Usually, when performing such tooth trace alignment is, for example, such as those disclosed in Japanese open flat 1-164863, JP and performs <br/> working with gear for combined tooth trace as jigs is there.

[0003]

In the scissors gear as described above, the main gear and the sub gear are manufactured to have the same thickness with a predetermined error range provided. May be larger than that of. When the difference in the tooth thickness caused by such a manufacturing variation is multiplied, when the tooth alignment is performed, the tooth alignment becomes difficult due to the difference in the tooth thickness of the sub gear, or the tooth with the tooth alignment is adjusted. When the sub gear protrudes from the main gear by the difference in tooth thickness on the tooth surface opposite to the surface and is assembled to the gear device, the protruding portion may be caught by a gear to be meshed with the sub gear so that the sub gear cannot be assembled. The tendency of the workability of assembling to a gear device to deteriorate due to such a difference in tooth thickness becomes more remarkable in a double scissor gear in which sub gears are provided on both sides of the main gear due to a shift of the sub gears on both sides. ing. An object of the present invention is to solve such a problem.

[0004]

In order to achieve the above object, the present invention takes the following measures. That is, assembly of the double scissors gear according to the present invention.
The method comprises: a first gear element having a predetermined number of teeth formed thereon;
The first gear element has the same tooth shape and the same number of teeth as the first gear element and is urged in opposite directions by elastic force in the circumferential direction of the first gear element.
And a second gear element slidably mounted on both sides of the first gear element, each second gear element having a tooth thickness of a tooth of the first gear element. small made da than the thickness
A method for assembling a bull scissors gear, the method comprising:
Close the car element to one side of the first gear element
And the other second gear element is connected to the first gear element.
After pressing in the circumferential direction by closely contacting the other side of the element,
Each second gear element slides relative to the first gear element
To prevent the first gear element from opposing.
Having a length reaching the tooth surface of the second gear element between the adjacent tooth surfaces
Healing with the mating surface for mating the teeth
Tool and insert the tooth surface of one second gear element against the elastic force.
And rotate one of the opposing tooth surfaces of the first gear element.
The jig that is in close contact with the tooth surface
Rotating the tooth surface of the other second gear element against the elastic force;
In contact with the other tooth surface of the opposing tooth surface of the first gear element
In contact with the other mating surface of the jig
Assembling with relative movement of first and second gear elements prohibited
It is characterized in that the prohibition of the relative movement is released after being assembled to the gear device .

[0005]

With such a configuration, even if the first gear element and the second gear element are aligned with each other during the assembly, the tooth thickness of the second gear element is equal to the first tooth thickness. Since it is smaller, the teeth of the second gear element do not protrude from the first gear element. That is, the tooth thickness of the second gear element is smaller than the tooth thickness of the first gear element on the tooth surface side opposite to the tooth surface of the second gear element in which the teeth and the teeth of the first gear element are aligned. By a small amount, the tooth surface of the second gear element is retracted from the tooth surface of the first gear element, and there is no protrusion between the respective tooth surfaces of the first and second gear elements in the thickness direction of the gear element. . This
The relative movement of the first and second gear elements is prohibited in the state of
Since it is stopped and assembled, it is
Do not disturb the teeth of the gear unit when attaching
The workability of the work is improved, and the influence of the accuracy of the jig in the tooth aligning work can be avoided.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. Double scissors gear 100 shown in FIG.
The main gear 1 is a first gear element, and has the same tooth shape and the same number of teeth as the main gear 1 and is slidable in the circumferential direction of the main gear 1 by elastic force on both side surfaces of the main gear 1. A sub gear 2, which is a second gear element to be worn;
3 is provided. The tooth thickness of the main gear 1 and the tooth thickness of the sub gears 2 and 3 are not the same. If the tooth thickness of the sub gears 2 and 3 is smaller than the tooth thickness of the main gear 1 and the difference is set to an ordinary error. For example, it may be 100 μm. Therefore, when the teeth of the sub gears 2 and 3 are superimposed on the teeth of the main gear 1, even if one of the tooth surfaces is flush with the tooth surface of the main gear 1, the other tooth surface is the other tooth of the main gear 1. Does not protrude from the surface. Although each gear element in this embodiment described below is a spur gear, the type of the gear element is not limited, and may be, for example, an involute helical gear.

The main gear 1 has a shaft hole 12 for inserting a support shaft (not shown) into a cylindrical boss 11 at the center thereof.
The wall portion 13 between the boss 11 and the teeth 1a has four hollow holes 4 for hollowing out. The thickness of the boss 11 is
The tooth 1a is located approximately at the center of the boss 11 in the thickness direction, which is about three times the thickness of the boss 11a. Lubricating oil supplied from the support shaft is supplied to the boss 11 by the main gear 1, the sub gear 2,
Supply passages 14 are provided at two locations for supplying to the sliding contact surface with No. 3. The supply passage 14 is provided to be inclined in a diametrical direction from a substantially center in a thickness direction of the boss 11, and an outlet of the lubricating oil is opened to a shoulder portion 15 of the boss 11.
Therefore, the shaft hole 12 and the front and back sides of the main gear 1 communicate with each other. An annular groove is formed near each side end surface of the shoulder portion 15 of the boss 11, and a snap ring 5 for restricting the axial movement of the sub gears 2 and 3 is inserted into the groove.

The four hollow holes 4 are formed in the wall portion 13 between the boss 11 and the teeth 1a in a point-symmetric manner with respect to the center of the main gear 1. Along with the base 1b of 1a, it is provided in a range of about 65 ° with a width between the base 1b and the boss 11. A knock pin 7 for locking a torsion spring 6 described later is provided upright on the front and back sides of the wall 13 between the hollow 4 and the hollow 4 that are 180 ° apart in the circumferential direction. That is, in FIG. 3, when the wall 13 between the hollow hole 4a and the hollow hole 4b shown on the upper side is the first wall 13a and the knock pin 7 is erected on the surface of the main gear 1, another one is formed. Knock pin 7
Is erected on the back surface of the lower second wall 13b, which is 180 ° apart from the first wall 13a. The main gears 1 and 2 are provided at the boundary between the second wall 13b and the base 1b.
A set bolt hole 81 for inserting the set bolt 8, which is fastened when assembling the two sub gears 2 and 3,
It is formed on a straight line connecting the knock pins 7. By arranging the knock pin 7 and the set bolt 8 in this manner,
The double scissors gear 100 can be rotated in a well-balanced manner.

The two sub-gears 2 and 3 have substantially the same shape, although they differ in detail. Here, the one attached to the front side of the main gear 1 is the first sub-gear 2 and the remaining one is the first sub-gear 2. Let it be 2 sub gears 3. 1st sub gear 2
The tooth 2a and the base 2b of the tooth 2a protrude in the surface direction by about 1/2 of the thickness thereof, and have a shape in which the central portion is depressed. With such a shape, the boss 11 of the main gear 1 surrounds the stepped portion between the base 1b of the main gear 1 and the wall portion 13 when assembled.
The oil chamber 9 is formed as a space for storing the lubricating oil supplied from the supply passage 14 provided in the oil passage 9. That is, the oil chamber 9
Is formed between the wall 13 of the main gear 1 and the walls 20, 30 of the first and second sub-gears 2, 3. Therefore, the oil chamber 9 is formed on the front and back of the main gear 1, but is communicated with each other by the hollow hole 4. A shaft hole 21 having an inner diameter substantially equal to the outer diameter of the boss 11 of the main gear 1 is provided at the center thereof, and a knock pin 7 is provided upright on the back surface facing the main gear 1. Also, at the same position as the set bolt hole 81 of the main gear 1,
A through hole 22 through which the set bolt 8 is inserted is formed in the base 2b, and a through hole 23 into which a jig for assembling is inserted is formed in two places on the base 2b. The second sub-gear 3 is different from the first sub-gear 2 in that instead of the through-hole 22 for inserting the set bolt 8, when superimposed, the second sub-gear 3 is directly connected to the set bolt hole 81 of the main gear 1 and the through-hole 22 of the first sub gear 2. A screw hole 31 for screwing the set bolt 8 is provided at a position on the line, and the knock pin 7 is provided upright on the surface facing the main gear 1.
That is, since the first sub gear 2 is attached to the front side of the main gear 1, the knock pin 7 of the torsion spring 6 is erected on the back surface. However, the second sub gear 3 is attached to the back side of the main gear 1 so that the knock pin is attached. 7 will be erected on the surface. Reference numeral 32 denotes a through hole into which an assembly jig is inserted.

The torsion spring 6 is connected to the main gear 1.
A part of the ring is cut off, and is formed of a material that can be elastically deformed so as to generate an elastic force in a circumferential direction thereof. Both ends of the torsion spring 6 are provided with semicircular cutouts corresponding to the shape of the knock pin 7. When the main gear 1 and the sub gears 2 and 3 are assembled to the double scissors gear 100, the notches engage with the knock pins 7 of the main gear 1 and the knock pins 7 of the sub gears 2 and 3, respectively, and fix the torsion spring 6. So that the position does not shift without doing so.

In such a configuration, the assembling and the tooth alignment are performed as follows. First, assembly
First, one end of the torsion spring 6 is engaged with each knock pin 7 on each of the front and back surfaces of the main gear 1, and then the knock pins 7 of the first and second sub gears 2 and 3 are connected to the other end of the torsion spring 6. And the first and second sub-gears 2 and 3 are connected to the main gear 1.
Are in close contact with the side surfaces of the base 1b, which are substantially both side surfaces. Then, the snap ring 5 is mounted on the boss 11 of the main gear 1 to prohibit the movement of the first and second sub gears 2 and 3 in the support shaft direction. Thereafter, in order to the tooth trace alignment, the assembly jig for rotating the first and second subsidiary gear 2 against the elastic force of the torsion scan pulling 6, fitted with a double scissor gear 100 assembled, the The first and second sub gears 2 and 3 rotate in the direction of the anti-elastic force. Rotation is performed until the through hole 22 of the first sub gear 2, the set bolt hole 81 of the main gear 1, and the screw hole 31 are aligned substantially in a straight line, and the set bolt 8 is screwed into the screw hole 31 at that position. Perform temporary fixing. At this time, the first sub-gear 2 and the second sub-gear 3 are urged in directions opposite to each other.
One of the sub-gear 2 and the second sub-gear 3 is made unrotatable with respect to the assembly jig, and the other is rotated to perform a temporary fixing operation.

[0012] After the temporary fixing is completed, the operation of the actual tooth alignment is started. First, as shown in FIG. 7, a hexagonal tooth alignment jig 123 whose cross-sectional shape is a rectangular shape in which two opposing corners are cut in parallel is inserted into the tooth space. That is, the tooth alignment jig 123 is
When inserted into the opposing tooth space of the main gear 1, the first support
It has a length reaching the tooth surface of the gear 2 and the second sub gear 3
Mating surfaces 123a, 123b for aligning the teeth
It is equipped with the back . The main gear 1 is provided on one mating surface 123a of the tooth aligning jig 123.
One tooth surface 1na of the n-th tooth and n of the first sub gear 2
The tooth surface 1nb of the (n + 1) -th tooth of the main gear 1 facing the one tooth surface 1na of the main gear 1 and the second sub-gear 3 so that the one tooth surface 2na of the second tooth is in close contact with the other surface 123b. Tooth surface 3nb of the (n + 1) th tooth of
And the first sub gear 2 and the second support
Each of the gears 3 is rotated against the elastic force . Then, each tooth surface is completely aligned with the tooth alignment jig 123.
Then, the set bolt 8 is tightened to fix the main gear 1 and the first and second sub-gears 2 and 3 to complete the tooth alignment. Therefore, on the opposing tooth surfaces of the main gear 1, the respective tooth surfaces of the first sub gear 2 and the second sub gear 3 are flush with each other. Looking at this for one tooth of the main gear 1, the tooth surface of the first sub gear 2 is flush with the one tooth surface on one tooth surface side of the tooth, and the tooth surface of the second sub gear 3 Forms a step with one tooth surface. Similarly, on the other tooth surface side of the tooth of the main gear 1, the tooth surface of the second sub gear 3 is flush with the other tooth surface, but the tooth surface of the first sub gear 2 is stepped. Is formed.

As described above, at the time of assembling, it is possible to prevent a decrease in the accuracy of tooth alignment due to a variation in tooth thickness. That is, the first and second gears are determined by the tooth thickness of the main gear 1.
Since the tooth thickness of the sub-gears 2 and 3 is small, when the teeth of the respective sub-gears 2 and 3 are aligned with each other when the tooth thickness of the sub-gears 2 and 3 is uneven, the tooth surface of the teeth of the respective sub-gears 2 and 3 is the main gear. It does not protrude laterally than the one tooth surface, and the accuracy of the tooth alignment can be substantially improved. Therefore, even in the case of a gear arrangement as described later, even if the other gears to be combined overlap in the axial direction of the gears, the assembly can be performed without any problem, and the efficiency of the assembling work is greatly improved. Can be done. Furthermore, as described above, the jig 123 for tooth alignment may have a hexagonal cross-sectional shape in which two opposing corners are cut off, so that the thickness accuracy of the jig itself is reduced. Does not need to be secured over the entire tooth width of the main gear 1, the first sub gear 2 and the second sub gear 3, and it is possible to prevent a decrease in the accuracy of tooth alignment due to a poor accuracy of the jig.

Such a double scissors gear 100 is
For example, as shown in FIGS. 8 and 9, it can be used as an idle gear in a gear device. 8, when the gear thickness of the drive gear D is larger than the thickness of the main gear 1, the teeth of the main gear 1 and the second sub gear 2 overlap (mesh) with each other at the time of assembly. However, since the tooth thickness of the first and second sub-gears 2 and 3 is smaller than the tooth thickness of the main gear 1, the teeth of the second sub-gear 3 become the teeth of the main gear 1 even when the teeth are aligned with the first sub-gear 2. The assembly can be completed without any problem without protruding from the surface. Therefore, even if the gear thickness of the drive gear D varies, there is no problem in assembling, and the efficiency of the assembling work is not reduced. Also, in the case where the interfering object W exists near the second driven gear Dnb and it is not possible to secure a required engagement width with the first driven gear Dna in terms of strength (a in the figure), the pairing is also performed. By moving the first driven gear Dna toward the first sub gear 2 at the time of attachment (b in the drawing), the meshing width can be ensured.

Further, as shown in FIG. 9, the first driven gear D
If na is engaged with each of the sub-gears 2 and 3, the axial dimension of the gears can be reduced, and the gear arrangement can be reduced as a whole.

[0016] As the tooth trace alignment jig 123 used for working the tooth trace alignment, for example, as shown in FIG. 1 0, the cross-sectional shape, and a polygon there is a step in the tooth trace mating surface Can also be used. In the jig having such a shape, the main gear 1 and the first and second
The tooth surfaces of the sub gears 2 and 3 do not become flush with the tooth surfaces of the sub gears 2 and 3, but the tooth thickness of each of the sub gears 2 and 3 overlaps the tooth thickness of the main gear 1. That is, each of the sub gears 2 and 3 does not become flush with any of the teeth of the main gear 1, and the set bolt 8 is fastened in a state where a step is formed between the teeth and the main gear 1. It will be tightened to.

The present invention is not limited to the embodiment described above. In addition, the configuration of each unit is not limited to the illustrated example, and various modifications can be made without departing from the spirit of the present invention.

[0018]

According to the present invention, as described in detail above, the first
Since the tooth thickness of each second gear element is smaller than the tooth thickness of the first gear element, the teeth of the second gear element protrude from the tooth surface of the first gear element even when the teeth are aligned. And each second side of the first gear element has a second
The gear elements are brought into close contact with each other while being urged in the circumferential direction,
The first gear is temporarily fixed so as to suppress sliding movement.
Reaches the tooth surface of the second gear element between the opposing tooth surfaces of the element
Face the mating surface for aligning the teeth with length
Since the tooth alignment is performed by inserting the provided jig, the efficiency of the tooth alignment can be improved, and the reduction of the tooth alignment accuracy can be effectively prevented.
In addition, since a portion of the jig used for tooth alignment that requires accuracy can be reduced, the manufacture of the jig can be facilitated.

[Brief description of the drawings]

FIG. 1 is a perspective view showing one embodiment of the present invention.

FIG. 2 is a sectional view of the embodiment.

FIG. 3 is a front view of the main gear of the embodiment.

FIG. 4 is a front view of a first sub gear according to the embodiment.

FIG. 5 is a front view of a second sub gear according to the embodiment.

FIG. 6 is an essential part perspective view showing a tooth portion of the embodiment in an enlarged manner.

FIG. 7 is a cross-sectional view of the embodiment in which a tooth alignment jig is set on a cross section taken along line AA of FIG. 6;

FIG. 8 is a schematic configuration explanatory view showing an example of a gear arrangement to which the embodiment is applied.

FIG. 9 is a schematic configuration explanatory view showing another example of the gear arrangement to which the embodiment is applied.

FIG. 10 is an essential part cross-sectional view showing the configuration of another tooth mating jig of the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Main gear 1na, 1nb ... Tooth surface 2 ... 1st sub gear 2na ... Tooth surface 3 ... 2nd sub gear 3nb ... Tooth surface

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁷ , DB name) F16H 55/00-55/30

Claims (1)

(57) [Claims] 1. A first gear element having a predetermined number of teeth formed thereon, and a first gear element having the same tooth shape and the same number of teeth as the first gear element.
Gear elements in opposite directions by elastic force in the circumferential direction
A second gear element which is biased and slidably attached to both sides of the first gear element, wherein each second gear element has a tooth thickness of the first gear element. A method for assembling a double scissors gear having a smaller tooth thickness , wherein one second gear element is attached to one side surface of a first gear element.
Circumferentially biased in close contact with the other second gear element
Is attached to the other side surface of the first gear element and is attached in the circumferential direction.
After the biasing, each second gear element becomes the first gear element
Are temporarily stopped so as to suppress sliding with respect to the first gear element, and the teeth of the second gear element are interposed between the opposing tooth surfaces of the first gear element.
Alignment for aligning teeth with a length that reaches the surface
Insert the jig provided with its surface facing backward, and rotate the tooth surface of one second gear element against the elastic force.
In contact with one of the opposing tooth surfaces of the first gear element
To the one mating surface of the jig, and the other
The first gear is rotated by rotating the tooth surface of the gear element against the elastic force.
The other of the jigs in close contact with the other tooth surface of the opposing tooth surface of the element
And the relative movement of the first and second gear elements in this state.
Prohibit relative movement after assembling to the assembled gear unit
Double scissors gear set characterized by releasing the stop
Standing method .