JP3512638B2 - Lubrication structure of continuously variable transmission for vehicles - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicular continuously variable transmission lubrication structure, and more particularly to a reduction gear lubrication structure.

[0002]

2. Description of the Related Art Conventionally, a V-belt transmission pulley is provided on each of an input shaft and an output shaft which are arranged in parallel with each other, and a winding diameter of a V-belt wound around both pulleys is changed to continuously change the V-belt. A V-belt type continuously variable transmission that performs gear shifting is known. In the case of a V-belt type continuously variable transmission, the input shaft and the output shaft rotate in the same direction, so that the rotation direction of the input shaft and the rotation direction of the differential device coincide with each other, and in order to obtain a necessary reduction ratio, A reduction shaft is arranged in parallel between the output shaft and the differential device. That is, the reduction shaft is provided with the first reduction gear and the second reduction gear, and the output gear fixed to the output shaft meshes with the first reduction gear,
The reduction gear meshes with the differential ring gear.

By the way, the oil discharged from the oil pump is used for lubrication of the oil chamber of the pulley, the torque converter, each part, etc. After that, the oil accumulates in the oil pan and the bottom of the case. In particular, since the portion in which the differential device is housed is located at the bottom of the case, a relatively large amount of oil accumulates around the differential device. Therefore, with the rotation of the differential device, the differential ring gear splashes oil, and the second reduction gear meshing with the ring gear can be lubricated.

However, sufficient oil is not applied to the first reduction gear arranged in parallel with the second reduction gear, which may result in poor lubrication. Therefore, conventionally, a method of increasing the absolute amount of oil in the transmission case and increasing the amount of oil applied to the reduction gear has been adopted, but this has a drawback that mechanical loss due to oil agitation becomes large.

Therefore, it has been proposed that a rib for collecting oil is provided below the first reduction gear inside the case, and the rib is used to temporarily store oil to lubricate the first reduction gear. (See Kaihei 8-28666).

[0006]

However, in the above-mentioned lubrication structure, since a special rib must be provided inside the transmission case, the case shape must be changed and the cost is increased. there were. Moreover, since the ribs may interfere with the movable parts in the transmission case, it is not possible to form large ribs, so that it is not possible to store a sufficient amount of oil and it is not possible to effectively lubricate the first reduction gear. There was a nature.

Therefore, an object of the present invention is to provide a lubrication structure for a continuously variable transmission for a vehicle, which can efficiently lubricate the first reduction gear without providing a rib or the like on the case.

[0008]

In order to achieve the above object, the invention according to claim 1 is provided with a V-belt transmission pulley on each of an input shaft and an output shaft arranged in parallel with each other. , So that the output gear fixed to the output shaft meshes with the first reduction gear provided on the reduction shaft arranged in parallel with the output shaft, and the second reduction gear rotating integrally with the first reduction gear meshes with the differential ring gear. In the continuously variable transmission for a vehicle described above, an oil communication passage extending in the radial direction from the inside to the differential case and opening to a side surface of the differential ring gear on the first reduction gear side is formed, and the first reduction gear of the differential ring gear is formed. An oil guide surface is formed on the side surface to allow the oil inside the differential device to pass through the oil communication passage. The first of the differential ring gear Te 1
Provided is a lubricating structure for a continuously variable transmission for a vehicle, which is characterized in that it is guided to a reduction gear side and further lubricates a first reduction gear through an oil guide surface.

The first reduction gear, which is insufficiently lubricated only by raising the ring gear, is lubricated by positively guiding the oil splashed by centrifugal force from the inside of the differential gear, so that a sufficient amount of lubrication is secured. In addition to being able to reduce the absolute oil amount, it is possible to reduce the mechanical loss.

According to a second aspect of the present invention, the chamber in which the V-belt transmission pulley is arranged and the chamber in which the first and second reduction gears and the differential device are arranged are isolated by the partition wall of the transmission case and the oil seal. In particular, the present invention is particularly effective. For example, in the case of a tension drive type continuously variable transmission that drives the V belt without lubrication,
Only the chamber in which the second reduction gear and the differential device are arranged is lubricated with oil, but it is difficult to lubricate the first reduction gear because the absolute amount of oil is insufficient. By applying the present invention here, the first reduction gear can be efficiently lubricated even with a small amount of oil.

[0011]

1 shows an FF type continuously variable transmission which is an example of a continuously variable transmission for a vehicle according to the present invention. The output shaft 2 of the engine 1 drives the pump impeller 4 of the torque converter 3, and the turbine runner 5 is connected to the drive shaft 10. The stator 6 is connected to a fixed portion 8 such as a transmission case via a one-way clutch 7. In addition, inside the torque converter 3, the drive shaft 10
A lock-up clutch 9 connected to one end of is arranged.

A planetary gear type forward / reverse switching mechanism 11 is provided at the other end of the drive shaft 10. This forward / reverse switching mechanism 1
Reference numeral 1 denotes a sun gear 12 connected to the drive shaft 10, a carrier 13 connected to an input shaft 21 of the continuously variable transmission 20, a first planetary gear 14 that is rotatably supported by the carrier 13, and meshes with the sun gear 12, and a carrier 13. A second planetary gear 15 that is rotatably supported and that meshes with the first planetary gear 14, a ring gear 16 that meshes with the second planetary gear 15, a forward clutch 17 that is provided between the carrier 13 and the drive shaft 10, and a ring gear 16 include a transmission case. A reverse brake 18 that connects and disconnects with a fixed portion 19 such as the above. When the forward clutch 17 is engaged and the reverse brake 18 is released, the drive shaft 10, the carrier 13 and the input shaft 21 are integrally rotated to enter the forward drive state, the forward clutch 17 is released, and the reverse brake 1 is released.
When 8 is fastened, the ring gear 16 and the sun gear 12 rotate in opposite directions, so that the backward drive state is established.

The continuously variable transmission 20 is, for example, a V belt 25.
Is a non-lubricated tension drive system, and includes an input side pulley 22 provided on the input shaft 21, an output side pulley 24 provided on the output shaft 23, and a V belt 25 wound between the pulleys 22 and 24. It is composed of. The input side pulley 22 has a fixed sheave 22a and a movable sheave 22b, and a gear ratio control oil chamber 26 for controlling the gear ratio is provided behind the movable sheave 22b. On the other hand, the output side pulley 24 also has a fixed sheave 24a and a movable sheave 24b, like the input side pulley 22, and behind the movable sheave 24b is a load thrust that gives a thrust necessary for torque transmission to the V belt 25. A control oil chamber 27 is provided. The hydraulic pressures of the gear ratio control oil chamber 26 and the load thrust control oil chamber 27 are controlled by a hydraulic control device (not shown).

An output gear 28 is fixed to the end of the output shaft 23, and the output gear 28 is connected to a ring gear 33 of a differential device 32 via reduction gears 30 and 31 provided on a reduction shaft 29. The differential device 32 distributes power to the left and right axles 34, 35.

2 shows a specific structure of the transmission system from the output shaft 23 to the differential device 32, FIG. 3 shows a detail of a part of FIG. 2, and FIG. 4 shows a cross section of a part of FIG. Indicates. The chamber 53 in which the continuously variable transmission 20 is housed and the chamber 54 in which the output gear 28, the reduction gears 30 and 31, and the differential device 32 are housed are the transmission case 5
The partition wall 50a of 0 and the oil seal 52 isolate the lubricating oil from the chamber 54 to the chamber 53. The differential device 32 is arranged at the bottom of the chamber 54, and a predetermined amount of oil is accumulated in this portion. The chamber 54 is formed between the transmission cases 50 and 51.

The differential device 32 of this embodiment
Is equipped with two differential cases 36 and 37, the flange portions 36a and 37a of which are attached to the ring gear 33.
They are integrated by tightening together with the fastening bolts 43. Between the cases 36 and 37, the axle 3
A pair of side gears 38, 39 coupled to 4, 35 and pinion gears 40, 4 meshing with the side gears 38, 39.
1, a pinion shaft 42 supporting the pinion gears 40, 41
Etc. are housed. One of the differential cases 37 has a window hole 37b formed therein.
The oil in the chamber 54 enters into the differential device 32 via the and the gears can be lubricated.

As shown in FIG. 3, the mating surfaces of the flange portions 36a, 37a of the differential cases 36, 37 extend radially outward from the insides of the differential cases 36, 37 to extend the first reduction gear 30 of the ring gear 33. The oil communication passages 44 that open to the side surface on the side (the left side surface in FIGS. 2 and 3) are formed at two locations on the periphery. The oil communication passage 44 of this embodiment also serves as a relief hole for the shaft support hole of the pinion shaft 42 formed in the differential case 36 as shown in FIG. An oil guide surface 33 a extending toward the first reduction gear 30 is formed on the side surface of the ring gear 33 on the first reduction gear 30 side. The oil guide surface 33a of this embodiment extends so as to surround the outer periphery of the opening of the oil communication passage 44, but the invention is not limited to this.

The oil that has entered the differential cases 36 and 37 through the window hole 37b is guided to the first reduction gear 30 side of the ring gear 33 through the oil communication passage 43, as shown by the arrow in FIG. Further, the oil is supplied to the first reduction gear 30 via the oil guide surface 33a. Therefore, it is difficult to lubricate the first reduction gear 3 in the past.
0 can be efficiently lubricated. Moreover, the transmission case 50,
Since the reduction gear 30 can be efficiently lubricated without increasing the absolute amount of oil in 51, mechanical loss can be reduced. Further, since it is not necessary to change the shapes of the transmission cases 50 and 51 by only changing a part of the shape of the differential case 36, there is no increase in cost.

The structure of the continuously variable transmission according to the present invention is not limited to that shown in FIG. For example, the forward / reverse switching mechanism 11 is not limited to the planetary gear type, but may be a mechanism that shifts the switching sleeve in the axial direction for switching. In addition, the forward / reverse switching mechanism 11
The arrangement position of is not limited to the drive shaft 10, and may be provided on the output shaft 23. Further, the gear ratio control oil chamber 26
Instead of the load thrust control oil chamber 27, other means such as a motor may be used.

In the above embodiment, the continuously variable transmission 20 is an example of a tension drive system in which the V-belt 25 is driven without lubrication, but it is a compression drive system in which the V-belt 25 is driven while being lubricated with oil. Good. Even in the case of the compression drive system, if the chamber 53 accommodating the continuously variable transmission 20 and the chamber 54 accommodating the differential device 32 are lubricated with different oils, it is difficult to lubricate the reduction gear in the chamber 54. Therefore, the present invention is effective. Further, in the above-mentioned embodiment, the differential case is shown as an example of a two-piece type, but it goes without saying that it may be an integral type.

[0021]

As is apparent from the above description, claim 1
According to the invention described above, the differential case extends in the radial direction from the inside to form an oil communication passage opening to the side surface of the differential ring gear on the first reduction gear side, and the oil guide is formed on the side surface of the differential ring gear on the first reduction gear side. Since the surface is formed and the oil inside the differential device is guided to the first reduction gear side of the differential ring gear through the oil communication passage, and the first reduction gear is lubricated through the oil guide surface, the differential device The oil that is splashed off from the inside by centrifugal force can be positively used, and a sufficient amount of lubrication can be secured. Moreover, since the absolute oil amount in the transmission case can be reduced, mechanical loss due to stirring can be reduced. Further, since it is not necessary to perform special processing such as an oil sump rib inside the transmission case, cost increase can be suppressed.

[Brief description of drawings]

FIG. 1 is a skeleton diagram of an example of an FF type continuously variable transmission to which the present invention is applied.

FIG. 2 is a detailed sectional view of a differential device portion.

FIG. 3 is a partially enlarged view of FIG.

FIG. 4 is a partial cross-sectional view taken along the line IV-IV of FIG.

[Explanation of symbols]

20 continuously variable transmission 21 Input axis 22 Input side pulley 23 Output shaft 24 Output side pulley 28 output gears 29 Reduction axis 30 1st reduction gear 31 Second reduction gear 32 differential device 33 differential ring gear 33a Oil guide surface 36,37 differential case 44 oil passage 50 transmission case 50a partition wall 52 Oil seal

Claims (2)

(57) [Claims] 1. An V-belt transmission pulley is provided on each of an input shaft and an output shaft arranged in parallel with each other, and an output gear fixed to the output shaft is provided on a reduction shaft arranged in parallel with the output shaft. In a continuously variable transmission for a vehicle in which a second reduction gear that meshes with a first reduction gear and rotates integrally with the first reduction gear meshes with a differential ring gear, the continuously variable transmission extends radially from the inside to a differential case, and An oil communication path that opens to the side surface on the first reduction gear side is formed, and an oil guide surface is formed on the side surface on the first reduction gear side of the differential ring gear described above to allow oil inside the differential device to pass through the oil communication path. Guide it to the first reduction gear side of the ring gear and Lubrication structure for a vehicle continuously variable transmission, which comprises lubricating the first reduction gear via the oil guide surface. 2. The chamber in which the V-belt transmission pulley is arranged and the chamber in which the first and second reduction gears and the differential device are arranged are separated by a partition wall of a transmission case and an oil seal. The lubrication structure for a continuously variable transmission for a vehicle according to claim 1.