JP3083932B2 - 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 double scissor 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. (3-4)
No. 3490). In such a scissors gear, the lubricating oil from the rotating shaft of the main gear can be stored in an oil chamber formed between the main gear and the sub gear so as to supply the lubricating oil to the sliding contact surface between the main gear and the sub gear. It is configured.

[0003]

In the scissors gear described above, the main gear and the sub gear have substantially the same thickness, or the thickness of the main gear is larger than that of the sub gear. Therefore, the weight tends to be larger than that of a normal gear, and the inertia weight tends to be larger.However, even if the parts other than the teeth of the main gear are thinned without reducing the mechanical strength, the weight does not reach the desired value. It was difficult to lose weight, and there was a limit to its weight reduction. An object of the present invention is to solve such a problem.

[0004]

This Application SUMMARY OF THE INVENTION In order to achieve the above object, in which took measures as described below. That is, the double scissors gear of the invention according to claim 1 of the present patent application is, has a first gear element obtained by forming a predetermined number of teeth, and a number of teeth of the same tooth profile of the first gear element First
Second gear elements respectively attached to both side surfaces of the first gear element in such a manner as to be slidable by elastic force in the circumferential direction of the first gear element, and the first gear element and the second gear element Between
Torsion spring capable of generating the elastic force
Comprising a grayed, between the portion other than the teeth of the first gear element and the second gear element space is formed, circles vent hole in the first gear element, it communicates the respective spaces between Circumferentially
It is characterized in that it is provided at at least two places at equal pitch . The first gear element has a hollow hole and a hollow hole.
Dowel pin with torsion spring engaging between holes
A first gear element having first and second wall portions
Assemble second gear elements respectively attached to both sides of the
To insert the set bolt that is fastened when
Tobolt holes are drilled on a straight line connecting the first and second walls.
Are preferred.

[0005]

According to the first aspect of the present invention , a space for storing lubricating oil is formed between the first gear element and each of the second gear elements. In these spaces, since the second gear element functions as a lid, the lubricating oil in the spaces does not flow out. Therefore, the first gear element
It is possible to have hollow holes in at least two places at equal pitches in the circumferential direction .
Gear element is lightened. Thus, the inertial weight can be reduced without lowering the mechanical strength. In the case of the invention according to claim 2 of the present application, the first aspect
Gears attached to both sides of the gear element
Insert the set bolt that is fastened when assembling the element
Bolt holes for the first gear element
Drill on a straight line connecting the first and second walls with the hollow hole.
When drilling, the first wall and the second
To set up a knock pin on either side of the wall
Based on the hole that has been drilled, the wall with the hole drilled and the wall that remains
It is only necessary to make a set bolt hole on a straight line connecting did
Thus rotating the first gear element half a turn about its center
It is easy to know the position of the set bolt hole
And improve the workability of drilling set bolt holes
be able to.

[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. Each gear element in this embodiment is an involute helical gear having 67 teeth,
In FIG. 2, only the end faces of the teeth 1a, 2a and 3a are shown.

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 16 is formed near the side end face of each shoulder 15 of the boss 11, into which a snap ring 5 for restricting the axial movement of the sub gears 2, 3 is inserted.

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. 4, 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, one end of a 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 brought into torsion. While being engaged with the other end of the spring 6, the first and second sub gears 2, 3 are brought into close contact with the side surfaces of the base 1b, which are substantially both side surfaces of the main gear 1. After this, set bolt 8
Into the through hole 22 of the first sub gear 2 and the set bolt hole 81 of the main gear 1, and into the screw hole 31 of the second sub gear 3.
Screw. At this time, the teeth of the main gear 1 are matched with the teeth of the first and second sub-gears 2 and 3 and the set bolt 8 is tightened to a specified torque. When the set bolt 8 is tightened, the teeth must be aligned against the elastic force of the torsion spring 6. Therefore, the pins provided on the assembly jig are fitted into the two through holes 32 of the second sub gear 3. In this state, a jig is similarly set in the two through holes 23 of the first sub gear 2, and 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 in a straight line (together with the gear teeth of each gear), and the set bolt 8 is inserted.

When the double scissors gear 100 assembled as described above is in use, the lubricating oil is supplied to the main gear 1 and the first and second sub-gears 2 and 3 via the support shaft of the main gear 1. The oil is injected into the oil chamber 9, which is a space formed therebetween, through the supply passage 14 of the boss 11 and stored. In addition, since the side portion of the main gear 1 is surrounded by the first and second sub-gears 2 and 3, the main gear 1 has a thicker base 1b portion of the teeth 1a and the boss 11 and a thicker wall portion 13 Even if the hollow hole 4 is formed, the lubricating oil does not flow out to the outside. By providing the hollow hole 4, the self-weight can be reduced, the inertial weight can be adjusted, and the well-balanced rotation can be achieved. Can be.

In this embodiment, the hollow hole 4
Are provided with their centers separated by 90 °. Therefore, when drilling a through hole for erecting the set bolt hole 81 and the knock pin 7 in the main gear coarse material, the hollow hole 4 is formed.
The first one through hole in any of the walls 13 between
Drilling may be performed such that a through hole remaining in the wall portion 13 at a position 180 ° away from that position is formed, and a set bolt hole 81 is formed on the extension thereof. That is, the position where the first one through hole is opened may be any wall portion,
By rotating the main gear coarse material a half turn from the position where the eye is opened, the position of the next through hole can be known, and the workability of the hole drilling can be improved.

Such a double scissors gear 100 is
For example, in an automobile diesel engine, the engine is interposed between a crankshaft gear, a gear for driving an injection pump, and a gear for driving a vacuum pump,
The present invention can be applied to an idle gear for transmitting power. In this case, the crankshaft gear and the gear for driving the vacuum pump are composed of the first sub gear 2 and the main gear 1.
And the gear for driving the injection pump is meshed with the second sub gear 3 and the main gear 1. By applying the present invention to the engine in this manner, backlash of each gear is eliminated, and rattling noise can be prevented.

The present invention is not limited to the embodiment described above. For example, in the above embodiment, the first gear element and the second gear element are described as involute helical gears, but these gear elements may be spur gears. 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.

[0016]

The invention according to claim 1 of the present patent application according to the present invention, as described in detail above, by the structure of disposing the second gear element on both sides of the first gear element, space it is possible to prevent the outflow of the lubricating oil outside to be stored in, whereby the reduced at a constant pitch in the circumferential direction to the first gear element
Also, two or more hollow holes can be provided, and significant weight reduction can be achieved. Further, according to claim 2 of the present application,
According to the description, the first gear element has a hollow hole and a hollow hole.
Between the knock pins that the torsion spring engages
First and second wall portions, wherein both of the first gear element
Assemble second gear elements, each mounted on the side
Set bolts for inserting set bolts
Do not drill a hole in the straight line connecting the first and second walls.
When drilling, the first wall
A knock pin is erected on one of the second wall and the second wall
The first gear element in it based on the hole drilled
A half-turn about the heart to make the hole
Position the set bolt holes on a straight line connecting the
It is easy to know and the set bolt hole drilling workability
Can be improved.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a front view of the embodiment.

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

FIG. 4 is a front view of the main gear of the embodiment.

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

FIG. 6 is a front view of a second sub gear according to the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Main gear 2 ... 1st sub-gear 3 ... 2nd sub-gear 4 ... Hollow hole 9 ... Space

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-5-14718 (JP, U) JP-A 62-119563 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F16H 55/00-55/30

Claims (2)

(57) [Claims] A first gear element having a predetermined number of teeth formed therein and a first gear element having the same number of teeth as the first gear element.
Second gear elements respectively attached to both side surfaces of the first gear element in such a manner as to be slidable by elastic force in the circumferential direction of the first gear element, and the first gear element and the second gear element Between
Torsion spring capable of generating the elastic force
Comprising a grayed, between the portion other than the teeth of the first gear element and the second gear element space is formed, circles vent hole in the first gear element, it communicates the respective spaces between Circumferentially
A double scissors gear comprising at least two or more equal pitches . 2. The first gear element has a hollow hole and a hollow hole.
Between the knock pins that the torsion spring engages
First and second wall portions, wherein both of the first gear element
Assemble second gear elements, each mounted on the side
Set bolts for inserting set bolts
Do not drill a hole in the straight line connecting the first and second walls.
The double scissor cedar according to claim 1, wherein
Ya.