JP2019039480A - Driving force transmission gear device and automatic transmission - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the supply of lubricating oil to a gear around a helical gear. SOLUTION: A first helical gear 17a, a second helical gear 16c arranged above the first helical gear 17a and meshing with the first helical gear 17a, and a first helical gear 17a and a second helical gear 16c are housed and supported. It has a case, a gear 16b arranged on one side surface side of the second helical gear 16c, and a first baffle plate 22 arranged on one side surface side of the first helical gear 17a, and has teeth of the first helical gear 17a. Is oriented in a twisting direction so that the side of the first baffle plate 22 is on the upstream side of the rotation direction of the first helical gear 17a rather than the side of the gear 16b, and the gear 16b is on the upper part of the first baffle plate 22. It has a first guide portion 22g formed so as to extend upward toward the gear tooth 16g1 and be inclined so that the clearance with one side surface of the first helical gear 17a increases toward the upward direction. [Selection diagram] FIG. 6

Description

  The present invention relates to a driving force transmission gear device suitable for a vehicle differential device and an automatic transmission including the same.

  A structure in which a baffle plate is provided around a gear in a case of a vehicle driving force transmission gear is disclosed (for example, Patent Document 1). By covering the vicinity of the gear in the case with the baffle plate, an oil reservoir for storing oil such as lubricating oil in the case is divided into the inside and outside of the baffle plate, and the oil stirring resistance due to the rotation of the gear is reduced.

  That is, in the vicinity of the gear, the oil stirred by the gear is limited to the space inside the baffle plate and the stirring resistance can be lowered, and the oil accumulated in the oil sump in the space outside the baffle plate in the case is not stirred. , Does not become resistance.

  Patent Document 1 discloses a structure in which a baffle plate is provided around a substantially lower half portion of a final gear fixed to a differential case in a transmission case in a differential device.

Japanese Patent No. 5844019

  By the way, a helical gear (helical gear) excellent in quietness is often used for the driving force transmission gear, and a structure in which a baffle plate is provided around the helical gear in the case is also known.

  As a result of intensive studies by the inventors of the present application, it has been found that the oil scooped up by the helical gear scatters in the direction of the helix angle of the helical gear.

  The present invention provides a driving force transmission gear device and an automatic transmission that can improve the supply of lubricating oil to gears around the helical gear by utilizing such characteristics of the helical gear. The purpose is to do.

  (1) In order to achieve the above object, a driving force transmission gear device according to the present invention is disposed above a first helical gear for transmitting a driving force of a vehicle, the first helical gear, and the first helical gear. A second helical gear that meshes with the gear, a case that houses and supports the first helical gear and the second helical gear, a gear that is disposed between one side of the second helical gear and the case, A first baffle plate disposed between one side surface of the first helical gear and the case, and a twist direction of gear teeth of the first helical gear is set so that the vehicle moves forward. When the helical gear rotates, the one side surface is oriented so as to mesh later than the other side surface, and the upper portion of the first baffle plate extends upward toward the gear teeth of the gear, and It is characterized by having a first guide portion clearance is formed to be inclined so as to be greater between one side of the first helical gear as it goes upward.

  (2) having a second baffle plate disposed between the other side surface of the first helical gear and the case, the first helical gear being sandwiched between the first baffle plate and the second baffle plate; The second baffle plate covers the circumferential surface and the other side surface of the first helical gear below the horizontal line passing through the center of the first helical gear, and the first baffle plate above the horizontal line. It is preferable to have the 2nd guide part extended toward the meshing position of a helical gear and the said 2nd helical gear.

  (3) A vertical upper portion of the first baffle plate and the second baffle plate on the downstream side in the rotation direction of the first helical gear is disposed in the case along with the rotation of the first helical gear on the downstream side in the rotation direction. The first guide portion and the second guide portion are provided further downstream in the rotational direction and vertically above the extension portion than the extension portion. It is preferable.

  (4) The automatic transmission according to the present invention is characterized by being equipped with the driving force transmission gear device described in any of (1) to (3) above.

  According to the present invention, the lubricating oil can be efficiently supplied to the upper gear by utilizing the behavior characteristic of the oil by the gear teeth of the helical gear.

It is a transverse cross section explaining an automatic transmission which has a driving force transmission gear device concerning each embodiment of the present invention. It is a block diagram of the automatic transmission concerning each embodiment of this invention. It is principal part sectional drawing of the automatic transmission concerning each embodiment of this invention. It is a perspective view (perspective view seen from the transmission case side) inside the case of the automatic transmission according to the embodiment of the present invention. It is a perspective view (perspective view seen from the converter housing side) inside the case of the automatic transmission according to the embodiment of the present invention. It is a figure which shows the gear inside the case of the automatic transmission concerning embodiment of this invention, Comprising: (a) is the front view seen from the direction orthogonal to a gear shaft, (b) shows the characteristic of a helical gear. FIG.

  Embodiments of the present invention will be described below with reference to the drawings. Note that the embodiment described below is merely an example, and there is no intention to exclude various modifications and technical applications that are not explicitly described in the following embodiment. The configurations of the following embodiments can be implemented with various modifications without departing from the spirit thereof.

[Configuration of automatic transmission]
FIG. 2 is a configuration diagram showing a vehicle automatic transmission 2 having a driving force transmission gear device according to each embodiment and configured as a belt-type continuously variable transmission. As shown in FIG. 2, the automatic transmission 2 includes a first axis O ₁ , a second axis O ₂ , a third axis O _3, and a fourth axis O _4, and each axis O ₁ to Each O ₄ is equipped with a power transmission element.

On the first shaft O ₁ , there are an engine 1 for outputting the driving force of the vehicle, a lockup type torque converter 11 connected to the engine 1, a forward / reverse switching mechanism 12 connected to the torque converter 11, A primary pulley 13 connected to the forward / reverse switching mechanism 12 is arranged in this order.

On the second axis O _2, the secondary pulley 15 connected through the primary pulley 13 and the belt 14 are arranged. On the third axis O ₃ is an idler gear 16 which is drivingly connected to the secondary pulley 15 is arranged. On the fourth shaft O _4, the differential mechanism 17 having a final gear 17a that meshes with the idler gear 16 is disposed.

  In the automatic transmission 2 configured with four shafts, each power transmission element is housed and supported in a case 3 including a converter housing (first case member) 4 and a transmission case (second case member) 5. The

  A torque converter 11 is accommodated in the converter housing 4, and a forward / reverse switching mechanism 12 is accommodated in the axial direction on the torque converter 11 side in a space formed by coupling the converter housing 4 and the transmission case 5. The first case portion 3a and the third case portion 3c in which the idler gear 16 and the differential mechanism 17 are housed are provided, and the primary pulley 13 and the secondary pulley 15 are housed on the opposite side of the torque converter 11 in the axial direction. The second case portion 3b is provided.

  The driving force transmission gear device 10 according to each embodiment is composed of a final gear 17a of a differential mechanism 17 provided in the case 3 of the automatic transmission 2 and the surrounding structural elements. The driving force is output.

  2 and 3, the differential mechanism 17 includes a final gear 17a meshing with the output gear 16c of the idler gear 16, a differential case 17b to which the final gear 17a is coupled, and a differential case (hereinafter, differential case). A pinion gear 17c that is mounted inside the differential case 17b and revolves integrally with the differential case 17b, and a side gear 17d that is connected to the rotation shafts 6a and 6a of the left and right drive wheels 6 and 6 are provided.

  The shafts (difference shafts) 17e of the left and right side gears 17d are supported by the case 3 by bearings 18a and 18b via the differential case 17b. Accordingly, the final gear 17a coupled to the differential case 17b is also supported by the case 3 via the bearings 18a and 18b.

  Tapered roller bearings are applied to the bearings 18a and 18b. In FIG. 3, the right side gear 17d is supported by the converter housing 4 by the first taper roller bearing 18a, and the left side gear 17d is second tapered by the transmission case 5. It is supported by a roller bearing 18b.

  The idler gear 16 has an input gear 16b and an output gear 16c fixed to the idler shaft 16a, and the input gear 16b has an output gear fixed to the rotary shaft 15a of the secondary pulley 15 of the continuously variable transmission mechanism. 15b is engaged.

  Such a differential mechanism 17 is accommodated in the third case portion 3 c of the case 3 including the converter housing 4 and the transmission case 5. Further, in the case 3, lubricating oil is stored in order to supply the lubricating oil to each sliding portion such as a bearing portion and a gear meshing portion.

FIG. 1 is a cross-sectional view showing the automatic transmission 2 cut along a cross section orthogonal to each of the axes O _{1 to} O ₄ . As shown in FIG. 1, the shafts O _{1 to} O ₄ are arranged compactly so as to be adjacent to each other and gather, and the fourth shaft O ₄ equipped with the final gear 17a is arranged at the lowest in the vertical direction.

  An oil pan 7 is provided at the bottom of the case 3. An oil sump 7a is formed in the upper part of the oil pan 7 below the case 3, and lubricating oil is stored in the oil sump 7a. Lubricating oil in the oil reservoir 7a is sucked from an oil suction port 8 by a pump (not shown) and supplied from the upper part in the case 3 to each lubricating part.

Most fourth shaft O ₄ final gear 17a provided arranged in the lower portion, the which lower part is arranged to dip into the oil reservoir 7a, reduced oil level of the lubricating oil in the oil reservoir 7a Unless otherwise, the lower part of the final gear 17a is submerged in oil.

Between the final gear 17a and the case 3, as shown in FIGS. 3 to 6, a baffle plate set 20 composed of a pair of baffle plates 21 and 22 (hereinafter also simply referred to as a baffle plate 20) is provided. Has been placed. The baffle plate 20 is a partial region including a vertically downward than the center of rotation (fourth axis) O ₄ of the final gear 17a, the rotation center O ₄ about the vertical line Lv1 directed downward, the final gear 17a It arrange | positions so that the final gear 17a may be surrounded in the upstream and downstream area | region of a rotation direction.

[Baffle plate]
The baffle plate 20 includes a housing side baffle plate 22 (first baffle plate) supported by the converter housing 4 and a transmission case side baffle plate 21 (second baffle plate) supported by the transmission case 5. .

  As shown in FIG. 3, the housing-side baffle plate 22 is disposed between the final gear 17a (one side surface 17a2 thereof) and the inner wall surface 4a of the converter housing 4 facing the final gear 17a, and has a fan-shaped flat plate portion when viewed from the front. 22a and a curved surface portion 22b formed on the inner peripheral side of the flat plate portion 22a.

  The flat plate portion 22a is disposed so as to cover one side surface 17a2 of the final gear 17a, and the curved surface portion 22b is disposed so as to cover the differential case 17b adjacent to the one side surface 17a2.

The flat plate portion 22a and a curved portion 22b also, from the vicinity of the horizontal line Lh1 passing through the rotation center _{O 4} of the final gear 17a of the central angle of 90 degrees by the upstream side in the rotational direction of the final gear 17a than vertical line Lv1, Final than vertical line Lv1 It is arranged further over to the downstream (upward) than the horizontal line Lh2 passing through the rotation center O ₄ only central angle of 90 degrees in the direction of rotation of the gear 17a downstream of the final gear 17a.

  The transmission case side baffle plate 21 is disposed between the final gear 17a (the other side surface 17a1) and the transmission case 5, and is formed along a fan-shaped flat plate portion 21a and an arcuate outer periphery of the flat plate portion 21a. And a partial cylindrical portion 21b.

  The flat plate portion 21a is disposed between the other side surface 17a1 and the inner wall surface 5a of the transmission case 5 facing the other side surface 17a1 so as to cover the other side surface 17a1 of the final gear 17a. The partial cylindrical portion 21b is disposed between the outer peripheral gear surface 17a3 and the inner peripheral surface 5b of the outer peripheral wall portion of the transmission case 5 facing the outer peripheral gear surface 17a3 so as to cover the outer peripheral gear surface 17a3 of the final gear 17a.

The flat plate portion 21a and the partially cylindrical portion 21b, as shown in FIG. 1, around the horizontal line Lh1 passing through the rotation center _{O 4} only central angle of 90 degrees in the direction of rotation of the final gear 17a than the vertical line Lv1 upstream of the final gear 17a from being disposed further over to the downstream (upward) than the horizontal line Lh2 passing through the rotation center O ₄ Final only central angle of 90 degrees in the direction of rotation of the gear 17a downstream of the final gear 17a than vertical line Lv1.

  As described above, by arranging the baffle plate 20 around the lower portion of the final gear 17a, the oil reservoir 7a formed below the final gear 17a and storing the lubricating oil is formed in the internal space 20b and the external space of the baffle plate 20. Divided into 20a.

  As a result, the lubricating oil in the oil reservoir 7a in the external space (baffle plate external space) 20a outside the baffle plate 20 is not agitated even in the case 3, so that it does not become a resistance and is agitated around the final gear 17a. Is limited to the space inside the baffle plate 20. Since the amount of oil stirred in this way is reduced, the stirring resistance is reduced.

Note that baffle plate 20 is at the downstream side in the rotation direction of the final gear 17a (see outline arrows in FIG. 1), a horizontal line Lh2 passing through the rotation center O ₄ position higher than the upstream side to P1 (final gear 17a However, this is because the lubricating oil moves in the rotational direction along the inner wall of the case 3 along with the rotation of the final gear 17a, and the downstream side in the rotational direction (vertically upward in terms of arrangement). This is to cope with an increase in the oil level of the lubricating oil. In other words, the extension 20e that extends the downstream end of the baffle plate 20 attenuates the force that moves the lubricating oil that moves upward along the inner wall of the case 3 against the extension 20e. I have to.

  Since the lubricating oil storage space in the oil sump 7a is disposed below the final gear 17a, as described above, there is a concern about excessive supply rather than insufficient supply of the lubricating oil, but the gear above the final gear 17a. In this case, there is a risk of insufficient supply of lubricating oil.

  In the present apparatus, by using the baffle plate 20, the lubricating oil can be supplied to the meshing point P2 with the output gear 16c directly above the final gear 17a.

  Further, in this apparatus, helical gears (helical gears) in which gear teeth 17g and 16g2 are inclined are used for the final gear 17a and the output gear 16c meshing therewith. Therefore, the final gear 17a is also called a first helical gear, and the output gear 16c is also called a second helical gear.

  In particular, the twist direction of the gear teeth 17g of the final gear (first helical gear) 17a is such that the final gear 17a rotates when the vehicle moves forward as shown in FIGS. 6 (a) and 6 (b). One side surface 17a2 side (right side in FIG. 6) of 17a is oriented so as to be engaged later than the other side surface 17a1 side (left side in FIG. 6). Accordingly, the tooth surface on the downstream side of the gear teeth 17g of the final gear 17a is oriented in the direction toward the input gear 16b closer to the housing side baffle plate 22 than the output gear 16c (see arrow A2).

  In this apparatus, the baffle plate 20 is used by paying attention to the characteristics of such a helical gear so that the lubricating oil can be supplied also to the gear teeth 16g1 of the input gear 16b obliquely above the final gear 17a. Yes.

  That is, as shown in FIGS. 4 to 6, the transmission case side baffle plate 21 is positioned at the downstream end of the extension portion 21 e that is extended in order to suppress the rise in response to the rise in the oil level of the lubricating oil. (Position indicated by an alternate long and short dash line) Extends to a position near the meshing point P2 with the output gear 16c immediately above the final gear 17a on the downstream side (in the vertical direction in the structure) side of the rotation direction further than P1, and the guide portion (first 2 guide portions) 21g.

  The guide portion 21g is formed on both the flat plate portion 21a and the partial cylindrical portion 21b of the transmission case side baffle plate 21, and guides the oil that moves together with the gear teeth 17g to the vicinity of the meshing location P2 when the final gear 17a rotates. .

  As shown in FIGS. 4 and 5, the housing side baffle plate 22 has a downstream end position P1 of an extension portion 22e extended to suppress the rise in response to the rise in the oil level of the lubricating oil. Further, a guide part (first guide part) 22g is formed by extending further downstream (in the structure, vertically upward) in the rotational direction.

  The guide portion 22g is an extension of the flat plate portion 22a of the housing side baffle plate 22, and is closer to one side surface 17a2 of the final gear 17a (first helical gear) toward the upper side (downstream in the rotation direction of the final gear 17a). In order to increase the clearance between them, that is, incline in a direction toward the input gear 16b obliquely upward.

  In this way, the surface of the guide portion 22g is inclined, as shown in FIGS. 6A and 6B, when the final gear 17a rotates in the arrow A1 direction, it moves together with the gear teeth 17g. The oil is based on the knowledge that there is a characteristic toward the torsional direction of the gear teeth 17g as indicated by the arrow A2. That is, it is for guiding oil to the input gear 16b located in the twist direction of the gear teeth 17g.

[Action and effect]
Since the driving force transmission gear device according to the present embodiment is configured as described above, the following operations and effects can be obtained.

  By dividing the oil reservoir 7a into the inside and outside of the baffle plate 20 by the baffle plate 20, stirring of oil in the baffle plate external space 20a can be suppressed, and stirring resistance can be reduced.

  Further, since the baffle plate 20 is disposed further downstream than the horizontal line Lh2 on the downstream side in the rotational direction of the final gear 17a, the oil surface of the lubricating oil is downstream on the downstream side in the rotational direction as the final gear 17a rotates. Even if it rises, the ingress of oil into the internal space 20b of the baffle plate 20 can be suppressed.

  Since the guide portions 21g and 22g are provided above the baffle plate 20 (further downstream in the rotational direction than the horizontal line Lh2), the lubricating oil is used as the meshing point P2 between the final gear 17a and the output gear 16c, or the final gear. It can also be positively supplied to the gear teeth 16g1 of the input gear 16b obliquely above the gear 17a.

  When the final gear 17a rotates, the oil that moves together with the gear teeth 17g receives centrifugal force, so that it is likely to scatter in a direction away from the gear teeth 17g. However, the oil that moves together with the gear teeth 17g is prevented from scattering by the guide portion 21g, and moves between the gear teeth 17g and the inner surface of the guide portion 21g in the rotational direction.

  Since the guide portion 21g extends to the vicinity of the meshing location P2 with the output gear 16c directly above the final gear 17a, the oil is supplied to the meshing location P2 and contributes to the lubrication thereof.

  As shown in FIGS. 6A and 6B, when the final gear 17a rotates in the direction of the arrow A1, the oil that moves together with the gear teeth 17g moves in the twisting direction of the gear teeth 17g as shown by the arrow A2.

  A guide portion 22g that is inclined in the twisting direction of the gear teeth 17g is provided in a portion near the input gear 16b above the housing side baffle plate 22, so that oil directed toward the twisting direction of the gear teeth 17g is supplied to the guide portion 22g. Along the gear teeth 16g1 of the input gear 16b. Thus, the lubricating oil can be efficiently supplied to the gear teeth 16g1 of the upper gear 16b using the behavioral characteristics of the oil by the gear teeth of the helical gear.

  Thus, since the supply of the lubricating oil to the gear teeth 16g1 of the input gear 16b and the meshing location P2 of the final gear 17a and the output gear 16c is promoted, the lubricity of these portions is improved and the driving force transmission gear is improved. This contributes to improving the performance of the device 10 and the automatic transmission 2.

  Further, in order to prevent the oil level of the lubricating oil in the three cases 3 from rising along with the rotation of the final gear 17a, extension portions 21e provided on the vertical upper portion on the downstream side in the rotation direction of the baffle plates 21, 22; Since the guide portions 21g and 22g are provided further downstream in the rotational direction than 22e and vertically upward, the effect of suppressing the oil level rise by the extension portions 21e and 22e is not impaired.

  That is, the extension portions 21e and 22e for suppressing the oil level rise need to be close to the outer peripheral surface and the side surface of the final gear 17a. On the other hand, the guide portions 21g and 22g are separated from the side surface of the final gear 17a, for example, like the guide portion 22g, in order to supply the oil adhering to the outer peripheral surface and the side surface of the final gear 17a to the gear teeth 16g1 and the meshing location P2. It is also necessary. In this apparatus, since the guide portions 21g and 22g are provided on the downstream side in the rotation direction of the extension portions 21e and 22e, the functions of the extension portions 21e and 22e are not impaired.

[Others]
As mentioned above, although embodiment of this invention was described, this invention is not limited to these embodiment, It can implement in various deformation | transformation in the range which does not deviate from the meaning of this invention.

  For example, in the above-described embodiment, the final gear 17a of the differential mechanism 17 is exemplified, but the present invention is not limited to the final gear 17a and can be applied to various gears using a baffle plate.

1 Engine 2 Automatic transmission (belt type continuously variable transmission)
3 Case 4 Converter housing (first case member)
5 Transmission case (second case member)
6 Driving Wheel 7 Oil Pan 7a Oil Pool 8 Oil Suction Port 10 Driving Force Transmission Gear Device 11 Lockup Torque Converter 12 Forward / Reverse Switching Mechanism 13 Primary Pulley 14 Belt 15 Secondary Pulley 16 Idler Gear 16b Input Gear 16c Output Gear (Second Helical) gear)
16g1, 16g2 Gear teeth 17 Differential mechanism 17a Final gear (first helical gear)
17a1 Other side of final gear (first helical gear) 17a2 One side of final gear (first helical gear) 17b Differential case 17g Gear teeth 18a First bearing (first tapered roller bearing)
18b Second bearing (second taper roller bearing)
20 baffle plate 20a baffle plate outer space 20b baffle plate inner space 21 mission case side baffle plate 22 housing side baffle plate 21d, 22d recess 20e, 21e, 22e extension part 21g, 22g guide part A1 final gear (first helical gear) 17a Rotation direction A2 Oil movement direction by final gear (first helical gear) 17a Lv1 Vertical line Lh1, Lh2 Horizontal line O ₄ 4th axis (Rotation center of final gear 17a)

Claims (4)

A first helical gear for transmitting the driving force of the vehicle;
A second helical gear disposed above the first helical gear and meshing with the first helical gear;
A case for storing and supporting the first helical gear and the second helical gear;
A gear disposed between one side of the second helical gear and the case;
A first baffle plate disposed between one side surface of the first helical gear and the case;
The twist direction of the gear teeth of the first helical gear is oriented such that when the first helical gear rotates so that the vehicle moves forward, the one side face meshes later than the other side face,
The upper part of the first baffle plate is inclined so as to extend upward toward the gear teeth of the gear and to increase the clearance between the first helical gear and the side of the first helical gear. A driving force transmission gear device having a formed first guide portion. In claim 1,
A second baffle plate disposed between the other side surface of the first helical gear and the case;
The first helical gear is disposed between the first baffle plate and the second baffle plate,
The second baffle plate covers the circumferential surface and the other side surface of the first helical gear below a horizontal line passing through the center of the first helical gear, and the first helical gear and the first side above the horizontal line. A driving force transmission gear device having a second guide portion extending toward a meshing position with the two helical gear. In claim 2,
Lubricating oil in the case is formed in the vertical upper portion of the first baffle plate and the second baffle plate on the downstream side in the rotation direction of the first helical gear as the first helical gear rotates on the downstream side in the rotation direction. An extension is provided to prevent the oil level from rising,
The driving force transmission gear device, wherein the first guide part and the second guide part are provided further on the downstream side in the rotational direction and vertically above the extension part. An automatic transmission comprising the driving force transmission gear device according to any one of claims 1 to 3.

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