JPH0826918B2 - Low noise gear device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a low-noise gear device adapted to a vehicle transmission or the like.

(Prior Art) As a conventional low-noise gear device, one as shown in FIG. 13 is known.

This conventional low-noise gear device B is composed of uniaxial gears 101 and 3
By interposing a buffer member 106 in a hub portion 105 between the gear shafts 104 and the gear shafts 102 of the two shafts that mesh with the gears 103 of the shafts, the vibration due to the meshing of the gears is reduced.

(Problems to be Solved by the Invention) However, in such a conventional low-noise gear device, a cushioning member 106 interposed in the hub portion 105 is used to reduce vibration due to meshing of gears. Therefore, the buffer member 106 reduces the strength of the hub portion 105, making it impossible to transmit a high-load power, and the hub portion 10
5, the processing for inserting the buffer member 106 is troublesome,
There are problems such as increased costs.

The present invention pays attention to the above problems, and does not adversely affect the strength of members and power transmission, and the vibration (gear of a gear) in a gear device without causing a cost increase due to the addition of a new member or a machining process. The common task is to develop a low-noise gear device that can reduce noise).

(Means for Solving the Problems) In order to solve the above problems, in the low noise gear device according to claim 1, the number of teeth of the uniaxial gear and the triaxial gear that mesh with the biaxial gears are the same. In a certain triaxial parallel gear device, the phase difference on the line of action between the meshing of the uniaxial gear and the biaxial gear and the meshing of the biaxial gear and the triaxial gear is 1/2 of the front normal pitch. So that each of the gear shafts is arranged by setting an angle formed by a line connecting the center points of the 1st and 2nd axes and a line connecting the center points of the 3rd and 2nd axes. did.

Further, in the low-noise gear device according to claim 2, in a planetary gear device having four planetary gears that mesh with the outer periphery of the sun gear, the first and third planetary gears among the four planetary gears are provided. Meshing with sun gear, second and fourth
1st and 3rd, so that the phase difference on the line of action between the meshing of the planetary gears and the sun gear is 1/2 of the front normal pitch.
Each gear shaft is arranged by setting an angle between the straight line connecting the three center points of the planet gears and the sun gear and the straight line connecting the three center points of the second and fourth planet gears and the sun gear. Was adopted.

Further, in the low-noise gear device according to claim 3, in the three-axis parallel gear device in which the number of teeth of the uniaxial gear and the triaxial gear that mesh with the biaxial gear are different, The meshing ratio of the axial gears and the meshing ratio of the biaxial gears and the triaxial gears are made equal, and the meshing of the uniaxial gears and the biaxial gears and the meshing of the biaxial gears and the triaxial gears are performed. The angle between the line connecting the center points of the 1st and 2nd axes and the line connecting the center points of the 3rd and 2nd axes is set so that the phase difference on the line of action of is half the pitch of the front normal line. The means is characterized in that each gear shaft is set and arranged.

Further, in the low noise gear device according to claim 4, the number of teeth of the two gears having the same number of teeth provided on the two gear shafts, and the number of teeth of the uniaxial gear and the triaxial gear that mesh with each other of the two gears are In the same three-axis parallel gear device, the angle formed by the line connecting the center points of the 1-axis and 2-axis and the line connecting the center points of the 3-axis and 2-axis is Prepare the two gear shafts so that the phase difference on the line of action between the meshing of one gear and the meshing of the other two-axis gear and the three-axis gear is 1/2 the front normal pitch. The phase difference is set for both gears.

Further, in the low noise gear device according to claim 5, the number of teeth of the two gears having the same number of teeth provided on the two gear shafts, and the number of teeth of the uniaxial gear and the triaxial gear that mesh with each other of the two gears are In different three-axis parallel gear devices, the meshing rate of the one-axis gear and one of the two-axis gears and the meshing rate of the other two-axis gears and the three-axis gears are made to coincide with each other. The angle between the line connecting the center points of the two axes and the line connecting the center points of the three axes and the two axes, the meshing of one gear of the one axis and one gear of the two axes, and the other gear of the two axes And the phase difference on the line of action between the meshing of the three axis gears is 1/2 of the front normal pitch, the phase difference is set for both gears provided on the two axis gears. The means.

(Operation) The operation of the invention of claim 1 will be described.

In the low noise gear device according to claim 1, a uniaxial gear and two gears are provided.
A pair of gears consisting of a combination of axial gears, a biaxial gear and three
Two pairs of gears are set by the pair of gears formed by combining the gears of the shafts.

Then, the phase difference on the line of action between the meshing of the uniaxial gear and the biaxial gear and the meshing of the biaxial gear and the triaxial gear should be 1/2 of the front normal pitch. Each gear shaft is arranged by setting an angle between a line connecting the center points of the two axes and a line connecting the center points of the three axes and the two axes.

When the gears are driven, vibrations due to the meshing of the uniaxial gears and the biaxial gears and vibrations due to the meshing of the biaxial gears and the triaxial gears occur. Since the cycle corresponds to the front normal pitch, if the meshing phase difference is set to 1/2 of the front normal pitch as described above, the waveform of the tooth spring stiffness that causes vibration will also be 1 / It becomes a function with two periods of phase shift.

Therefore, the two vibrations have vibration waveforms in opposite phases to each other, the meshing vibrations are canceled by this, and the gear noise of the entire device in the three-axis parallel gear device in which the number of teeth of the uniaxial gear and the triaxial gear is the same. Is reduced.

 The operation of the invention according to claim 2 will be described.

In the low noise gear device according to claim 2, two pairs are provided by a gear pair formed by a combination of the first and third planetary gears and a sun gear and a gear pair formed by a combination of the second and fourth planetary gears and a sun gear. The gear pair is set.

The phase difference on the line of action between the meshing between the first and third planetary gears and the sun gear and the meshing between the second and fourth planetary gears and the sun gear is 1/2 the front normal pitch. So that the angle between the straight line connecting the three central points of the first and third planetary gears and the sun gear and the straight line connecting the three central points of the second and fourth planetary gears and the sun gear is set. Then, the respective gear shafts are arranged.

Therefore, similarly to the first aspect of the present invention, the meshing vibrations due to the two pairs of gears are canceled each other, and the gear noise as a whole device in the planetary gear device having four planetary gears meshing with the outer periphery of the sun gear is reduced. It is reduced.

 The operation of the invention according to claim 3 will be described.

In the low noise gear device according to claim 3, two pairs of gears are set as in the low noise gear device according to claim 1.

Then, the meshing ratio of the uniaxial gear and the biaxial gear,
The meshing ratios of the three-axis gear and the three-axis gear are matched, and the phase difference on the line of action between the one-axis gear and the two-axis gear mesh and the two-axis gear and the three-axis gear mesh is the frontal phase difference. Each gear shaft is arranged so that the angle formed by the line connecting the center points of the 1st and 2nd axes and the line connecting the center points of the 3rd and 2nd axes is set to be 1/2 the normal pitch. It

Therefore, by matching the meshing ratios of the two pairs of gears, even though the number of teeth of the uniaxial gear and that of the triaxial gear that respectively mesh with the biaxial gear are different, Similarly to the device according to claim 1 in which the number of teeth of the shaft is the same as that of the gear, gear noise is reduced by setting a phase difference of 1/2 of the front normal pitch.

 The operation of the invention will be described.

In the low noise gear device according to claim 4, a uniaxial gear and two
Two pairs of gears are set by a pair of gears formed by the combination of one gear of the shafts and a pair of gears formed by the combination of the other gear of the two axes and a gear of the three axes.

The angle between the line connecting the center points of the 1-axis and the 2-axis and the line connecting the center points of the 3-axis and the 2-axis, the meshing of the uniaxial gear and the biaxial one gear, and the 2-axis And the other gear of 3
The phase difference between the two gears provided on the two gear shafts is set so that the phase difference on the line of action with the meshing of the shaft gears is half the front normal pitch.

Therefore, similarly to the invention described in claim 1, the meshing vibrations caused by the two pairs of gears are canceled each other, so that the two gears having the same number of teeth provided on the two gear shafts are uniaxial gears and triaxial gears. The gear noise of the entire device in the three-axis parallel gear device having the same number of teeth as that of the gear is reduced.

 The operation of the present invention will be described.

In the low noise gear device according to claim 5, two pairs of gears are set as in the low noise gear device according to claim 4.

Then, the meshing ratio of the uniaxial gear and one of the biaxial gears and the meshing ratio of the other of the biaxial gears and the triaxial gear are made to coincide, and a line connecting the center points of the uniaxial and biaxial gears. When,
Action of meshing of a uniaxial gear with one of two biaxial gears and meshing of another biaxial with another triaxial gear with respect to an angle formed by a line connecting the center points of the three axes The phase difference is set to both gears provided on the two gear shafts so that the phase difference on the line becomes 1/2 of the front normal pitch.

Therefore, by matching the meshing ratios of the two pairs of gears, the uniaxial gears are different from each other in the number of teeth of the uniaxial gear and the triaxial gear that respectively mesh with the two biaxial gears. The gear noise is reduced by setting the phase difference of 1/2 of the front normal pitch, similarly to the device according to the first aspect, in which the number of teeth of the three-axis gear is the same.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

 First, the configuration of the first embodiment will be described.

FIGS. 1 to 3 show a first embodiment corresponding to the first aspect of the present invention.
It is an explanatory view showing low noise gear device A1 of an example, and in this example, the teeth of 1 axis helical gear 1a and 3 axis helical gear 3a which mesh with biaxial helical gear 2a, respectively. This is a three-axis parallel gear device in which the numbers are the same, and the uniaxial gear shaft 1b, the biaxial gear shaft 2b, and the triaxial gear shaft 3b are arranged in parallel.

Then, as shown in FIG. 3, the simultaneous contact line 4a showing the meshing state of the uniaxial helical gear 1a and the biaxial helical gear 2a.
And the phase difference 6a on the same line of action 5b with the simultaneous contact line 5a showing the meshing state of the two-axis helical gear 2a and the three-axis helical gear 3a is the front eye normal pitch (tes). The gear shafts 1b, 2b, 3b are arranged so as to be 1/2 of 7a.

That is, the angle Y formed by the center points O ₁ , O ₂ and O ₃ of the _three gear shafts 1b, 2b and 3b is Z ₂ : Each gear shaft 1b, 2b, 3b is arranged so that the number of teeth of the biaxial helical gear 2a is n: an integer.

 Here, δ is given by the following equation.

Yg ₂ : Basic radius of biaxial helical gear 2a tes: Front normal pitch In Fig. 3, 4b is the mesh between uniaxial helical gear 1a and biaxial helical gear 2b. Line of action, 4c is the same mesh length, 5b
Is a line of action of meshing between a two-axis helical gear 2a and a three-axis helical gear 3a, 5c is the same meshing length, and 2c is a two-axis helical gear.
2a is a basic circle, 2d is a tooth tip circle, 1c is a basic circle of a uniaxial helical gear 1a, and 3c is a basic circle of a triaxial helical gear 3a.

 Next, the operation will be described.

In the three-axis parallel gear device as in this embodiment, the vibration caused by the meshing of the uniaxial helical gear 1a and the biaxial helical gear 2a and the biaxial helical gears 2a and 3a. Vibration occurs due to meshing of the shaft with the helical gear 3a.

The cause of this vibration is the variation of the spring stiffness K of the tooth based on the variation of the distance between the contact point of the tooth that moves due to the meshing of the gear and the center point of the gear. The spring stiffness K of this tooth is shown in FIG. As shown in, a periodic function is formed, and its period corresponds to the front normal pitch (tes) 7a.

In FIG. 4, 8 is the waveform of the tooth spring stiffness K due to the engagement of the uniaxial helical gear 1a and the biaxial helical gear 2a, and 9 is the biaxial helical gear. Gear 2a and three-axis helical gear
The waveform of the spring stiffness K of the tooth due to meshing with 3a is shown.

On the other hand, the simultaneous contact line 5a showing the engagement and state of the uniaxial helical gear 1a and the biaxial helical gear 2a is the same action line 5b.
Since a phase difference of 1/2 of the front normal pitch (tes) 7a is given above, the waveforms 8 and 9 of the spring stiffness K of the teeth are also functions which are out of phase with each other by 1/2 cycle.

Therefore, the vibration due to the meshing of the uniaxial helical gear 1a and the biaxial helical gear 2a and the vibration due to the meshing of the biaxial helical gear 2a and the triaxial helical gear 3a are The waveforms have opposite phases so as to cancel each other out, and the meshing vibration (gear noise) of the gears of the entire gear device is reduced.

As described above, in the low noise gear device A1 of the first embodiment, the meshing of the uniaxial helical gear 1a and the biaxial helical gear 2a and the biaxial helical gear are performed. The gear shafts 1b, 2b, 3b are arranged so that the phase difference on the line of action between the 2a and the meshing of the three-axis helical gear 3a is 1/2 of the front normal pitch (tes) 7a. In a three-axis parallel gear device in which the uniaxial helical gear 1a and the triaxial helical gear 3a have the same number of teeth, meshing vibration (gear noise) of the entire device can be reduced.

In addition, as mentioned above, reduction of gear noise is achieved by each gear shaft 1b, 2
Since this can be achieved simply by changing the arrangement of b and 3b, it does not adversely affect the strength of members and the power transmission force, and does not increase the cost due to the addition of new members and processing steps.

 Next, a second embodiment will be described.

The low noise gear device A2 of the second embodiment corresponding to the invention of claim 2 is a sun gear as shown in FIGS. 5 and 6.
The four planetary gears 11, 12, 13, 14 which mesh with each other 10 have the same number of teeth, that is, a five-axis parallel gear system.

Reference numeral 15 in the drawing denotes a ring-shaped internal gear, and a helical gear is used as the type of each gear.

Then, showing a simultaneous contact line 16 indicating the state meshing of the first planetary gear 1 1 and the third planetary gear 13 to the sun gear 10, also the meshing state of the second planetary gear 12 and the fourth planet gear 14 with respect to the sun gear 10 Same action line as simultaneous contact line 17
Phase difference 6b on 12b is the front normal pitch (tes)
The planetary gears 11, 12, 13, 14 are arranged so as to be 1/2 of 7b.

That is, in this embodiment, the first planetary gear 11 and the sun gear 10
And the center point O of the second planetary gear 12, the angle Y formed by O ₁ , O, and O ₂ , and the center point of the third planetary gear 13, the sun gear 10, and the fourth planetary gear 14.
The angle Y formed by O ₃ , O and O ₄ is the same as in the first embodiment, Zs: the number of teeth of the sun gear 10, n: the planetary gears 11, 12, 13, 14 are arranged so as to be an integer.

 Here, δ is given by the following equation.

Ygs: Radius of basic circle of sun gear 10 tes: Front normal pitch In Fig. 6, 11b, 12b, 13b, 14b are planetary gears 11, 1
Lines of action of meshing between 2, 13, 14 and the sun gear 10, 10a is a basic circle of the sun gear 10, and 11a, 12a, 13a, 14a are basic circles of the planetary gears.

Therefore, in the low noise gear device A2 of this embodiment,
The first planetary gear 11 and the third planetary gear 13 with respect to the sun gear 10.
Due to the meshing of the gears and the second planetary gear 12 and the fourth planet with respect to the sun gear 10 have opposite waveforms so that the vibrations due to the meshing of the gears 14 cancel each other out, and the meshing vibrations of the gears (gear noise ) Will be reduced.

By applying the relationship with the sun gear 10 in this embodiment to the relationship with the ring-shaped internal gear 15, vibration due to meshing with the ring-shaped internal gear 15 can be reduced, but each planetary gear 11, The meshing ratio with 12,13,14 is larger in the relationship with the ring-shaped internal gear 15 than in the relationship with the sun gear 10, and the variation in the spring stiffness of the teeth is small, so The noise prevention effect is higher when the conditions are set based on the relationship.

 Next, a third embodiment will be described.

A low noise gear device A3 of a third embodiment corresponding to the invention of claim 3 is, as shown in FIGS. 7 to 9, a uniaxial helical gear which meshes with a biaxial helical gear 2a. The number of teeth of the gear 1a is different from that of the triaxial helical gear 3a, and the uniaxial gear shaft 1b, the biaxial gear shaft 2b, and the triaxial gear shaft 3b are arranged in parallel. It is a 3-axis parallel gear device.

In this embodiment, the number of teeth of the uniaxial helical gear 1a is different from that of the triaxial helical gear 3a. In particular, the uniaxial helical gear 1a and the biaxial helical gear 1a are different. The meshing ratio with the helical gear 2a and the meshing ratio with the biaxial helical gear 2a and the triaxial helical gear 3a are formed to be equal in both the front meshing ratio and the overlapping meshing ratio. Simultaneous contact line 4a showing the meshing state of uniaxial helical gear 1a and biaxial helical gear 2a, and biaxial helical gear 2a and triaxial helical gear
Same action line 5b with simultaneous contact line 5a showing meshed state of 3a
The respective gear shafts 1b, 2b, 3b are arranged so that the above phase difference 6a is 1/2 of the front normal pitch (tes) 7c.

That is, the angle Y formed by the center points O ₁ , O ₂ and O ₃ of the _three gear shafts 1b, 2b and 3b is Z _2: number of teeth of the gears 2a helical of biaxial n: integer Yg _2: 2 base radius tes of helical of gears 2a: front-normal pitch m _n: the gear shaft 1b so that the module , 2b, 3b are arranged.

In FIG. 9, 4b is a line of action of meshing between the uniaxial helical gear 1a and the biaxial helical gear 2a, 4c is the meshing length, 5b
Is a line of action of meshing between a two-axis helical gear 2a and a three-axis helical gear 3a, 5c is the same meshing length, and 2c is a two-axis helical gear.
2a basic circle, 1c basic circle of uniaxial helical gear 1a, 3c 3
It is the basic circle of the helical gear 3a of the shaft.

Therefore, in the low noise gear device A3 of this embodiment,
The meshing ratio of the uniaxial helical gear 1a and the biaxial helical gear 2a and the meshing ratio of the biaxial helical gear 2a and the triaxial helical gear 3a depend on the meshing of the gears. The teeth of the uniaxial helical gear 1a and the triaxial helical gear 3a are formed so that both the front meshing ratio and the overlapping meshing ratio that determine the spring stiffness fluctuation of the tooth that becomes the vibration force are equal. The numbers are different 3
Also in the shaft parallel gear device, vibration caused by meshing between the uniaxial helical gear 1a and the biaxial helical gear 2a and the vibration of the biaxial helical gear 2a and the triaxial helical gear 3a Waveforms of opposite phases can be formed so that vibrations due to meshing cancel each other out, and meshing vibrations (gear noise) of the gears of the entire gear device can be reduced.

 Next, a fourth embodiment will be described.

A low noise gear device A4 of a fourth embodiment corresponding to the invention of claim 4 is, as shown in FIG. 10 and FIG. 11, two helical gears with the same number of teeth provided on the two gear shafts 2b. Uniaxial helical gear 1a and triaxial helical gear that mesh with helical gears 2a and 2e, respectively.
It is a three-axis parallel gear device having the same number of teeth as 3a.

And in this embodiment, the center point of each gear shaft 1b, 2b, 3b
The angle Y formed by O ₁ , O ₂ and O ₃ is And the meshing of the uniaxial helical gear 1a and one of the biaxial helical gears 2a, the meshing of the helical gear a,
The phase difference on the same line of action between the meshing of the other helical gear 2e of the two axes and the helical gear 3a of the three axes becomes 1/2 of the front normal pitch (tes). Both of them are provided in a state where the phases of the helical gears 2a and 2e are shifted from each other.

That is, as shown in FIG. 11, the phase difference η between the tooth profile 20a of one gear 2a of the two axes and the tooth profile 20e of the other gear 2e is Both gears 2a and 2e are arranged so that

Therefore, also in this embodiment, the same effect as in the case of the first embodiment can be obtained.

 Next, a fifth embodiment will be described.

The low noise gear device A5 of the fifth embodiment corresponding to the invention of claim 5 is different in the number of teeth of the uniaxial helical gear 1a and the triaxial helical gear 3a as shown in FIG. The three-axis parallel gear device is the same as the low-noise gear device A4 of the fourth embodiment except for the above points.

Therefore, in addition to the conditions in the fourth embodiment, the meshing ratio between the uniaxial helical gear 1a and the biaxial one helical gear 2a, and the two biaxial other helical gear 2e. By adding the condition of matching the meshing ratio of the three-axis helical gear 3a, the same effect as in the case of the fourth embodiment can be obtained.

Although the embodiment of the present invention has been described in detail above with reference to the drawings, the specific configuration is not limited to this embodiment, and the present invention is applicable even if a design change or the like is made within the scope not departing from the gist of the present invention. included.

For example, in the embodiment, the case where the helical gear is used is shown, but the kind of the gear is arbitrary.

(Effects of the Invention) As described above, in the low-noise gear device according to claim 1, the meshing of the uniaxial gear and the biaxial gear, and the meshing of the biaxial gear and the triaxial gear. The angle formed by the line connecting the center points of the 1st and 2nd axes and the line connecting the center points of the 3rd and 2nd axes so that the phase difference on the line of action with Since each gear shaft is set by setting, the two-axle gears can be used without adversely affecting the member strength and power transmission and without increasing the cost due to the addition of new members and machining processes. It is possible to reduce vibration (gear noise) in a triaxial parallel gear device in which the uniaxial gear and the triaxial gear that mesh with each other have the same number of teeth.

In the low noise gear device according to claim 2, 4
Among the planetary gears, the phase difference on the line of action between the meshing between the first and third planetary gears and the sun gear and the meshing between the second and fourth planetary gears and the sun gear is the front normal pitch. 1 / of
2 of the first and third planetary gears and the sun gear
The angle between the straight line connecting the two center points and the straight line connecting the three center points of the second and fourth planetary gears and the sun gear is set so that each gear shaft is arranged, which adversely affects member strength and power transmission. Vibration (gear noise) in a planetary gear device that has four planetary gears that mesh with the outer circumference of the sun gear without affecting the cost and without increasing the cost by adding new members and processing steps. Can be converted.

Further, in the low noise gear device according to claim 3, 1
Axial gear and biaxial gear meshing ratio, and biaxial gear and 3
While matching the meshing ratios of the axial gears, the phase difference on the line of action between the meshing of the uniaxial gears and the biaxial gears and the meshing of the biaxial gears and the triaxial gears is the front normal pitch of 1 /
Each gear shaft is arranged by setting the angle formed by the line connecting the center points of the 1st and 2nd axes and the line connecting the center points of the 3rd and 2nd axes so that the strength of the member and the power are increased. The number of teeth of the uniaxial gear and the triaxial gear that mesh with each of the biaxial gears are different without adversely affecting the transmission and without increasing the cost by adding new members and machining steps. Vibration (gear noise) in the three-axis parallel gear device can be reduced.

Further, in the low noise gear device according to claim 4, 1
The angle between the line connecting the center points of the two axes and the line connecting the center points of the three and two axes, the meshing of one gear of one axis and one of the two axes, and the other of the two axes The phase difference on the line of action between the gear and the meshing of the three-axis gear is 1/2 the front normal pitch.
Since the phase difference is set for both gears provided on the two gear shafts, it does not adversely affect the member strength and power transmission, and the cost is increased by adding new members and processing steps. Without tightening, two gears having the same number of teeth provided on the two gear shafts, and a three-axis parallel gear device in which the number of teeth of the one-axis gear and that of the three-axis gears that mesh with each other are the same. Vibration (gear noise) can be reduced.

Further, in the low noise gear device according to claim 5, 1
The meshing ratio between the shaft gear and one of the two shaft gears and the meshing ratio between the other shaft of the two shafts and that of the three shafts are matched, and a line connecting the center points of the one shaft and the two shafts is used. On the line of action of the meshing of the uniaxial gear and one of the biaxial gears, and the meshing of the other of the biaxial gears and the triaxial gear, with respect to the angle between the axis and the line connecting the center points of the biaxial Since the phase difference was set to both gears provided on the two gear shafts so that the phase difference of 1/2 would be 1/2 of the front normal pitch, there is no adverse effect on member strength or power transmission, and Two gears with the same number of teeth provided on the two gear shafts, and one uniaxial gear and two triaxial gears that mesh with each other without adding cost by adding new members and processing steps. Vibration (gear noise) in the three-axis parallel gear device having different numbers of teeth can be reduced.

[Brief description of drawings]

FIG. 1 is a side view showing a low noise gear device according to a first embodiment of the present invention, FIG. 2 is an overall layout diagram of the gear, and FIG. 3 is an explanatory view showing details of meshing states of the gear, and FIG. FIG. 5 is a diagram showing the change in spring stiffness of the teeth with time, FIG. 5 is an overall layout diagram of a gear according to the second embodiment of the present invention, FIG. 6 is an explanatory diagram showing details of the meshing state of the gear, and FIG. Is a side view showing the third embodiment of the present invention, FIG. 8 is an overall layout of the gear, FIG. 9 is an explanatory view showing the details of the meshing state of the gear, and FIG.
11 is a side view showing an embodiment, FIG. 11 is an explanatory view showing a phase shift state of the gear, FIG. 12 is a side view showing a fifth embodiment of the present invention,
FIG. 13 is an explanatory view showing a conventional low noise gear device. 1a: 1-axis helical gear 2a: 2-axis helical gear 3a: 3-axis helical gear 4b, 5b ... line of action 7a ... front normal pitch 10 ... sun gear 11 ...... First planetary gear 12 ...... Second planetary gear 13 ...... Third planetary gear 14 ...... Fourth planetary gear 7b ...... Front normal pitch 11b, 12b, 13b, 14b …… Line of action

Claims (5)

[Claims] 1. A triaxial parallel gear device in which the number of teeth of a uniaxial gear and a triaxial gear that mesh with a biaxial gear are the same, and the uniaxial gear and the biaxial gear mesh with each other. The phase difference on the line of action between the two-axis gear and the meshing of the three-axis gear is half the front normal pitch, the line connecting the center points of the 1-axis and 2-axis, and the 3-axis and 2-axis. A low-noise gear device in which each gear shaft is arranged by setting an angle formed with a line connecting center points of the shafts. 2. A planetary gear device having four planetary gears meshing with the outer circumference of a sun gear, wherein among the four planetary gears, first and third planetary gears mesh with the sun gear, and The three centers of the 1st and 3rd planetary gears and the sun gear are set so that the phase difference on the action line between the meshing of the 2nd and 4th planetary gears and the sun gear is 1/2 of the front normal pitch. A low-noise gear device in which each gear shaft is arranged by setting an angle between a straight line connecting the points and a straight line connecting the three central points of the second and fourth planetary gears and the sun gear. 3. A triaxial parallel gear device in which the number of teeth of a uniaxial gear and a triaxial gear that respectively mesh with a biaxial gear differ, and a meshing ratio of the uniaxial gear and the biaxial gear, The gear ratios of the two-axis gear and the three-axis gear should be the same, and the one-axis gear and the two-axis gear should be meshed with each other.
Connect the line connecting the center points of the 1st and 2nd axes and the center point of the 3rd and 2nd axes so that the phase difference on the line of action with the gear meshing of the shaft is 1/2 of the front normal pitch. A low-noise gear device in which each gear shaft is arranged by setting an angle formed by a line. 4. A three-axis parallel gear device in which two gears having the same number of teeth are provided on a two-axis gear shaft, and a uniaxial gear and a triaxial gear that mesh with each other have the same number of teeth. At an angle formed by the line connecting the center points of the 1-axis and the 2-axis and the line connecting the center points of the 3-axis and the 2-axis, the meshing of the gear of the 1-axis and the gear of the 2-axis Set the phase difference on both gears of the two gear shafts so that the phase difference on the line of action between the other gear of the shaft and the meshing of the three gears is 1/2 the front normal pitch. A low noise gear device characterized by the above. 5. A three-axis parallel gear device in which two gears having the same number of teeth are provided on a two-axis gear shaft, and the number of teeth of the uniaxial gear and the number of teeth of the two gears that mesh with each other are different. , The meshing ratio of the uniaxial gear and one of the biaxial gears,
While matching the meshing ratio of the other gear of the shaft and the gear of the three axes, with respect to the angle between the line connecting the center points of the one axis and the two axes and the line connecting the center points of the three axes and the two axes The phase difference on the line of action between the meshing of the one-axis gear and one of the two-axis gears and the meshing of the other two-axis gear and the three-axis gears is 1 / the front normal pitch.
A low noise gear device in which the phase difference is set to both gears provided on the two gear shafts so as to be 2.