CN211501593U - Baffle plate and transmission with same - Google Patents

Abstract

The utility model provides a plate washer and derailleur that has this plate washer. The baffle is provided with: a main body portion provided so as to separate the differential gear from the oil reservoir; a1 st guide part for guiding oil raised by the differential gear in the machine chamber to the control chamber; a cutout portion formed on the lower outer circumferential rib, defining a communication passage between the cutout portion and a side surface of the housing for flowing oil from the control chamber into the machine chamber; a through hole formed on the outer peripheral side of the opening of the body; and a2 nd flow guide portion which guides the oil raised by the differential gear and passed through the through hole to the shaft support portion, and a wall portion formed on an upper side of the through hole on the back surface of the main body portion. The stirring resistance of the differential gear to oil can be reduced, air is prevented from being sucked into the oil suction port in the control chamber, and the flow rate of the lubricating oil supplied to the shaft support portion of the differential gear is increased, thereby improving the smooth operation and strength durability of each component of the transmission.

Description

Baffle plate and transmission with same

Technical Field

The utility model relates to a baffle and derailleur that has this baffle, the derailleur possesses: a machine chamber defined in the housing and housing a plurality of gears including a differential gear; a control chamber which is disposed adjacent to the machine chamber in the housing and houses a mechanism for hydraulic control; and an oil reservoir formed between the inner surface of the casing and the side surface of the differential gear in the machine chamber, wherein the baffle plate is used for reducing the stirring resistance of the differential gear to the oil and controlling the flow of the oil raised by the differential gear.

Background

Conventionally, there is a transmission mounted on a vehicle, the transmission including: a machine chamber disposed in the housing and housing a plurality of gears including a differential gear; a control chamber which is disposed adjacent to the machine chamber in the housing and houses a mechanism for hydraulic control such as a hydraulic control main body; and an oil reservoir provided in the machine chamber at a gap between the differential gear and an inner side surface of the housing. In such a transmission, a lubricating oil supply structure for supplying oil in the case is provided in a place where lubrication is required, such as a bearing and a gear that support the rotating shaft. As a lubricating oil supply structure of this type, for example, patent documents 1 and 2 disclose a lubricating oil supply structure using oil raised by a differential gear. In the transmission, the oil film formation and cooling of the tooth surface of the gear, the inside of the rotating shaft, and the equiaxed supporting portion such as the bearing are performed by the lubricating oil supply structure, thereby ensuring smooth operation and strength durability of each component in the case.

However, the conventional lubricating structure using oil lifted by the differential gear has the following problems (a1) to (a 4).

(A1) The oil in the machine chamber (differential chamber) lifted by the differential gear falls down again into the machine chamber along the inner wall surface of the casing. Therefore, insufficient oil returns to the control chamber, resulting in a decrease in the oil level of the control chamber. Thus, there is a concern that: an oil suction port provided at or near the bottom of the control chamber is exposed from the oil surface, so that suction (inflation) of air (air) occurs.

(A2) A communication passage (oil inflow portion) that communicates with the bottom of the control chamber is formed in the bottom of the machine chamber. A part of the oil in the control chamber is returned to the machine chamber through the communication passage. The communication passage is formed in a gap portion between an inner surface of the housing and a partition wall integrally formed in the housing. That is, the communication passage is a portion formed by machining of the housing. Therefore, the size of the communication passage can be reduced less due to the condition of stress (strength) required for the housing. Thus, there is a problem that: the flow rate of oil flowing from the control chamber into the machine chamber cannot be appropriately controlled, resulting in an increase in the amount of oil in the machine chamber and an increase in the lift resistance of the differential gear.

(A3) An oil reservoir is formed in a gap between a side surface of the differential gear in the machine chamber and an inner side surface of the housing facing the side surface. However, there are the following problems: the side surface of the differential gear is in contact with (soaked in) the oil stored in the oil reservoir, whereby the oil in the oil reservoir is stirred with the rotation of the differential gear, and the stirring resistance of the oil increases.

(A4) For example, as shown in patent document 3, a lubricating oil passage for guiding a part of oil raised in a machine chamber to a support portion such as a bearing and a spline engaging portion of a differential gear is formed in an inner surface of a housing facing a side surface of the differential gear. However, since the lubricant passage is a groove-like (recessed) portion formed in the inner surface of the housing, most of the lubricant passing through the lubricant passage is dropped into the machine room in the middle. Therefore, there is a problem that a sufficient amount of lubricating oil cannot be supplied to the shaft supporting portion of the differential gear.

As disclosed in patent documents 4 and 5, there is a transmission provided with a damper provided in a case as a structure for restricting the flow of hydraulic oil in the case. By providing such a baffle, the flow of the hydraulic oil in the casing can be restricted to a desired state, and the hydraulic oil accumulated in the bottom portion of the machine chamber can be prevented from being stirred by the rotation of the differential gear. However, in the baffle of the conventional structure, there is no particular baffle which can cope with all the problems (a1) to (a4) described above with a single baffle.

Prior art documents

Patent document

Patent document 1: japanese patent laid-open publication No. 2004-176744

Patent document 2: japanese patent laid-open publication No. 2003-130190

Patent document 3: japanese patent No. 4409929

Patent document 4: japanese patent No. 4497896

Patent document 5: japanese patent No. 4497897

SUMMERY OF THE UTILITY MODEL

Problem to be solved by utility model

The present invention has been made in view of the above problems, and an object of the present invention is to provide a damper capable of coping with the above problems (a1) to (a4), and a transmission having the damper.

Means for solving the problems

In order to solve the above problem, the present invention provides a baffle plate provided in a transmission so as to separate a differential gear from an oil reservoir, the transmission including: a machine chamber defined in the housing and housing a plurality of gears including a differential gear; a control chamber which is disposed adjacent to the machine chamber in the housing and houses a mechanism for hydraulic control; and an oil reservoir formed between an inner surface of the casing and a side surface of the differential gear in the machine chamber, the baffle plate including: a body portion disposed on a side portion of the differential gear; a1 st flow guide portion formed on a surface of the main body portion on the oil storage portion side for guiding the oil raised by the differential gear in the machine chamber to the control chamber; an outer circumferential rib formed on a part of an outer circumference of the main body; a cutout portion provided on the outer circumferential rib, forming a communication passage between the cutout portion and an inner surface of the housing, the communication passage allowing oil to flow from the control chamber into the machine chamber; a slit-shaped through hole formed in the main body portion, the through hole being arranged so as to overlap a tooth profile portion of the differential gear when viewed in an axial direction of the differential gear; a2 nd flow guide portion formed below the through hole on the surface of the main body portion on the oil reservoir side, for guiding the oil raised by the differential gear and passing through the through hole to the shaft support portion of the differential gear; and a wall portion formed above the through hole on the surface of the main body portion on the oil reservoir side, extending from the 1 st flow guide portion toward the shaft support portion of the differential gear, and guiding the oil lifted by the differential gear to the shaft support portion of the differential gear. In the baffle, the 1 st deflector may be a plate-shaped projecting piece inclined so as to gradually descend from an upper portion of the machine chamber toward an upper portion of the control chamber. In the baffle plate, the wall portion is a plate-like projecting wall that projects in the axial direction of the differential gear on the surface of the body portion on the oil reservoir side. The 1 st end of the wall part is connected with the 1 st guide part, the 2 nd end of the wall part is connected with the shaft supporting part, and the 1 st end of the wall part has a protruding length larger than that of the 2 nd end in the axial direction of the differential gear.

The baffle of the present invention can solve the above problems (a1) to (a4) as described in the following (B1) to (B4).

(B1) By providing the first deflector on the baffle plate, the oil raised by the differential gear in the machine chamber is caught by the first deflector and flows into the control chamber along the first deflector, whereby the oil level of the hydraulic oil in the control chamber can be raised. Therefore, the oil suction port can be prevented from being exposed from the oil surface in the control chamber, and air (air) can be prevented from being sucked from the oil suction port, so that the inflation performance (air suction prevention performance) can be improved.

(B2) By forming the cutout portion in the baffle plate to define the communication passage that communicates the machine chamber and the control chamber, the size of the communication passage (the size of the cutout portion) can be set regardless of the stress (strength) required for the housing. Therefore, the flow rate of the oil flowing from the control chamber into the machine chamber through the communication passage can be restricted to a desired flow rate, and the stirring resistance of the differential gear to the oil can be effectively reduced.

(B3) The baffle is interposed between the side surface of the differential gear and the oil reservoir in such a manner as to space them apart from each other, thereby preventing the oil in the oil reservoir from contacting the differential gear. Therefore, the stirring resistance of the differential gear can be effectively reduced.

(B4) By providing the slit-shaped through-hole formed on the outer peripheral side of the opening portion of the main body portion, the 2 nd flow guide portion formed on the lower side of the through-hole formed on the oil reservoir side surface of the main body portion, and the wall portion formed on the upper side of the through-hole formed on the oil reservoir side surface of the main body portion and extending from the 1 st flow guide portion toward the shaft support portion of the differential gear, when oil in the machine chamber is lifted due to rotation of the differential gear in a state where the vehicle is moving forward or in a state where the vehicle is moving backward, the lifted oil is guided from the front side (differential gear side) to the back side (oil reservoir side) of the baffle plate through the slit-shaped through-hole. The oil is supplied to the shaft support portion supporting the differential gear along the 2 nd flow guide portion. The kicked up oil is reliably absorbed along the wall portion and supplied to the shaft support portion that supports the differential gear. Therefore, the flow rate of the lubricating oil supplied to the shaft support portion of the differential gear can be effectively increased.

Thus, according to the present invention, the above-described effects (B1) to (B4) can be achieved by the separate baffle, and therefore, air suction at the oil suction port in the control chamber can be prevented, the stirring resistance of oil accompanying the rotation of the differential gear can be reduced, and the flow rate of the lubricating oil supplied to the shaft support portion of the differential gear can be increased, thereby improving the smooth operation and strength durability of the components in the housing.

In the above-described baffle plate, a recessed portion that is formed continuously with the through-hole by recessing a back side of the differential gear-side surface in the axial direction is provided below the through-hole on the differential gear-side surface of the main body portion.

According to this configuration, the oil raised by the rotation of the differential gear can be efficiently taken into the through-hole by the recessed portion. Therefore, the flow rate of the lubricating oil supplied to the shaft support portion of the differential gear through the 2 nd flow guide portion can be more effectively increased.

Additionally, the utility model relates to a derailleur, the derailleur possesses the utility model discloses an above-mentioned arbitrary baffle of one.

According to the utility model discloses a derailleur possesses as the baffle that sets up between differential gear and oil storage portion the utility model discloses an above-mentioned arbitrary baffle to can reach the effect of above-mentioned (B1) - (B4). Therefore, it is possible to prevent air suction at the oil suction port in the control chamber, reduce the stirring resistance of the oil in the machine chamber caused by the rotation of the differential gear, and increase the flow rate of the lubricating oil supplied to the shaft support portion of the differential gear, thereby improving smooth operation and strength durability of the components in the housing.

The reference numerals in parentheses above are those of the constituent elements of the embodiments described below as an example of the present invention.

In order to make the aforementioned and other features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.

Drawings

Fig. 1 is a schematic side sectional view showing an internal structure of a transmission including a baffle according to an embodiment of the present invention.

Fig. 2 is a schematic view showing a cross section viewed along an X-X arrow of fig. 1.

Fig. 3 is a perspective view of the baffle viewed from the front side.

Fig. 4 is a perspective view of the baffle plate as viewed from above the rear surface side.

Fig. 5 is a rear view of the baffle.

Fig. 6 is a perspective view of the baffle plate as viewed from above on the front side.

Fig. 7 is a perspective view of the baffle plate as viewed from the back side.

Fig. 8 is a diagram for explaining the flow of the working oil in the casing by the baffle.

Fig. 9 is a diagram for explaining the flow of the working oil in the casing by the baffle.

Fig. 10 is a diagram for explaining the flow of the working oil in the casing based on the baffle.

Description of reference numerals:

1: a transmission;

3: a housing;

9: a differential gear;

9 a: a shaft support portion;

10: a machine room;

13: an oil storage section;

20: a communication channel;

30: a control room;

50: a baffle plate;

51: a main body portion;

55: an outer peripheral rib;

56: a cut-out portion;

57: a through hole;

58: a recessed portion;

61: the 1 st diversion part;

63: a2 nd flow guide part;

65: a wall portion;

Detailed Description

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Fig. 1 is a schematic side sectional view showing a transmission including a baffle according to an embodiment of the present invention, and fig. 2 is a schematic view showing a cross section viewed along an X-X arrow in fig. 1. The transmission 1 shown in fig. 1 includes a case 3 that houses constituent members such as a gear mechanism 2 and a hydraulic control main body, which will be described later. The interior of the housing 3 is divided into two chambers, a machine chamber 10 in which the gear mechanism 2 is housed and a control chamber 30 in which a hydraulic control main body and the like are housed.

The gear mechanism 2 in the machine chamber 10 includes: an input shaft 4 to which rotation from an engine (not shown) is input; an output shaft 5 disposed parallel to the input shaft 4; and a differential shaft (rotation shaft) 6. Further, the differential mechanism includes various gears 7 and 8 for forming a gear stage and a clutch (not shown) provided on the input shaft 4 and the output shaft 5, respectively, and a differential gear 9 provided on the differential shaft 6. The differential gear 9 is supported by the differential shaft 6 via a gear spline (shaft support portion) 9a, and is disposed near a bottom portion 10a of the machine chamber 10. In the following description, the term "axial direction" refers to the axial direction of the input shaft 4 and the output shaft 5, and the term "lateral direction" refers to the lateral direction (width direction) with respect to the axial direction. The term "up" or "down" refers to up or down in a state where the transmission 1 is mounted on a vehicle (the state shown in fig. 1).

As shown in fig. 1, an arc-shaped partition wall 3a for partitioning machine chamber 10 and control chamber 30 is formed at a position along the outer peripheral end face of differential gear 9 in the vicinity of bottom 10a of machine chamber 10. The partition wall 3a is integrally formed on the inner surface of the housing 3. The bottom 30a of the control chamber 30 and the vicinity thereof are separated from the bottom 10a of the machine chamber 10 and the vicinity thereof by the partition wall 3 a. A slight space is provided between the lower end of the partition wall 3a and the inner surface 3b of the lower side of the housing 3 opposed thereto. A part of a lower end edge 55a of a lower outer circumferential rib 55 of the baffle 50 described later is disposed at the interval. Also, a cutout portion 56 for defining the communication passage 20 that communicates the machine chamber 10 with the control chamber 30 is provided on the projecting lower outer circumferential rib 55.

As shown in fig. 2, an oil reservoir 13 for storing the hydraulic oil in the machine chamber 10 is formed between the back surface (side surface) 9b of the differential gear 9 and the inner surface of the housing 3 facing the back surface. A baffle 50 is provided along the back surface 9b of the differential gear 9. The baffle 50 is provided to space the differential gear 9 from the oil reservoir 13. The detailed structure of the baffle 50 will be described later.

The oil accumulated in bottom portion 30a of control chamber 30 is sucked through an oil suction port (not shown) that opens at or near bottom portion 30a of control chamber 30. The oil sucked through the oil suction port is supplied to a hydraulic circuit of a control main body, not shown, and the like provided in the transmission 1, and is used as a hydraulic pressure for operating a valve mechanism for gear shift control and the like. Further, oil for lubrication is supplied to bearing portions of the input shaft 4, the output shaft 5, the differential shaft 6, and the like. The lubricating oil supplied to the gears and bearing portions in the machine chamber 10 is stored in an oil reservoir 13 (see fig. 2) of the machine chamber 10. The oil accumulated in the bottom 10a of the machine chamber 10 (the periphery of the differential gear 9 and the oil reservoir 13) is kicked up by the rotation of the differential gear 9.

Here, the baffle 50 provided in the housing 3 will be described in detail. Fig. 3 to 6 are views showing the baffle 50, fig. 3 is a perspective view of the baffle 50 as viewed from the front side, fig. 4 is a perspective view of the baffle 50 as viewed from above on the back side, fig. 5 is a rear view of the baffle 50, and fig. 6 is a perspective view of the baffle 50 as viewed from above on the front side. Fig. 7 is a perspective view of the baffle 50 as viewed from the back side.

The baffle 50 is a plate-like member made of an integrally molded product made of synthetic resin. The baffle 50 includes a substantially circular flat plate-like body portion 51. An opening 52 formed of a circular through-hole through which the differential shaft (rotation shaft) 6 (see fig. 1) passes is formed in the center of the body 51. An upper outer circumferential rib 53 and a lower outer circumferential rib 55 are formed on the outer circumferential edge of the body 51 on the front surface (the surface on the differential gear 9 side, the same applies hereinafter) 51a side, and the upper outer circumferential rib 53 and the lower outer circumferential rib 55 project from the circumferential edge of the body 51 toward the front surface 51a side in the axial direction and extend in a substantially circular arc shape in the circumferential direction. The upper outer circumferential rib 53 is provided at a position surrounding a portion of the upper left side of the differential gear 9, and the lower outer circumferential rib 55 is provided at a position surrounding a portion of the lower right side of the differential gear 9, as viewed from the front surface 51a side of the body portion 51. The outer peripheral edge of the main body 51 except for the upper outer peripheral rib 53 and the lower outer peripheral rib 55 is formed to have a shape along the inner surface of the housing 3.

As shown in fig. 6, the lower outer circumferential rib 55 is provided with a notch 56. The notch 56 is a portion formed by cutting out a distal end portion (corner portion) of the lower end edge 55a of the lower outer circumferential rib 55 in a substantially rectangular shape. The cutout portion 56 is a portion that defines a gap for the communication passage 20 with the side surface 3b of the housing 3 in a state where the shutter 50 is attached to the back surface 9b side of the differential gear 9 as described later.

On the other hand, the upper end edge 51c of the main body 51 is formed into a substantially linear shape extending in the lateral direction. A1 st flow guide 61 in the form of a thin plate extending in the lateral direction along the upper edge 51c is formed on the rear surface 51b of the main body 51 below the upper edge 51 c. The 1 st flow guide 61 is a thin plate-like projecting piece projecting in the axial direction from the back surface 51b of the main body 51, and extends in the lateral direction between both sides of the main body 51 through between the upper end edge 51c and the opening 52. The upper surface 61c of the 1 st flow guide 61 is formed in a gently inclined surface shape gradually descending from the upper end portion 61a toward the lower end portion 61 b. That is, the 1 st flow guide portion 61 is configured to: the height position thereof gradually becomes lower from the upper end portion 61a toward the lower end portion 61 b. Thus, the 1 st flow guide 61 causes the oil to naturally flow down from the upper end portion 61a side toward the lower end portion 61b side by gravity. The 1 st deflector 61 is disposed with its upper end 61a facing upward and its lower end 61b facing downward. Further, a tray-shaped oil collecting portion 61d whose side portion is surrounded and whose upper side is open is provided on the axially rear side of the upper end portion 61a (the front surface 51a side of the body portion 51). The oil collecting portion 61d is provided at the upper end of the upper outer circumferential rib 53.

As shown in fig. 5, a slit-shaped through hole 57 is formed inside the upper outer circumferential rib 53 on the outer diameter side of the opening 52 so as to extend from the front surface 51a side to the rear surface 51b side of the body 51. The through-hole 57 is arranged such that the through-hole 57 partially overlaps with the tooth profile of the differential gear 9 when viewed in the axial direction of the differential gear 9. That is, the through-hole 57 is disposed at the upper left of the opening 52 when viewed from the front surface 51a side of the body 51, and is formed in a substantially rectangular shape extending in the radial direction with respect to the center of the opening 52. Further, a recessed portion 58 formed by recessing the front surface 51a of the body portion 51 toward the axial rear side (the rear surface 51b side) is formed below the through hole 57 in the front surface 51a of the body portion 51. The lower end of the recessed portion 58 continues from the front surface 51a of the main body 51 in an inclined plane shape, and the upper end thereof is connected to the lower end side of the through-hole 57. Thus, the through-hole 57 is opened toward the lower side from the front surface 51 side, and the oil lifted up from the lower side is easily taken in.

The through-hole 57 opens on the rear surface 51b of the main body 51 at a position below the upper end 61a of the 1 st flow guide 61. A2 nd flow guide 63 formed in a thin plate shape for guiding the hydraulic oil flowing out of the through hole 57 toward the opening 52 side is provided below the through hole 57. The 2 nd flow guide portion 63 is a plate-like portion protruding in the axial direction from the back surface 51b of the main body portion 51, and extends substantially in the lateral direction from a position along the lower end edge of the through hole 57 to a position along the outer periphery of the opening portion 52, as in the 1 st flow guide portion 61.

As shown in fig. 5 to 7, a wall 65 is formed on the back surface 51b of the main body 51 between the 1 st flow guide 61 and the 2 nd flow guide 63. The wall portion 65 extends from a position above the through-hole 57 to a position on the outer periphery of the opening 52 in the substantially vertical direction. That is, the wall portion 65 is formed above the through hole 57 in the back surface 51b of the main body portion 51 and extends from the 1 st flow guide portion 61 toward the gear spline (shaft support portion) 9a of the differential gear 9. The wall portion 65 is a plate-like projecting wall projecting in the axial direction from the back surface 51b of the main body 51, as in the case of the 1 st flow guide portion 61 and the 2 nd flow guide portion 63. The wall portion 65 extends from a position of the 1 st flow guide portion 61 located above the through hole 57 toward the shaft support portion 9a to a position close to the outer periphery of the opening portion 52 of the 2 nd flow guide portion 63, that is, a position of the outer edge of the shaft support portion 9 a. As shown in fig. 7, the 1 st end 65a of the wall portion 65 is connected to the 1 st flow guide portion 61, and the 2 nd end 65b of the wall portion 65 is connected to the shaft support portion 9 a. The wall portion 65 formed as a plate-like projecting wall is formed such that the projecting length from the back surface 51b of the main body 51 in the axial direction is highest at the 1 st end 65a and lowest at the 2 nd end 65 b. That is, the projection length of the 1 st end 65a of the wall portion 65 is larger than the projection length of the 2 nd end 65b in the axial direction of the differential gear 9.

As shown in fig. 1 and 2, the baffle 50 having the above-described structure is provided in the machine room 10 at a position along the rear surface (side surface) 9b side of the differential gear 9. That is, the body 51 of the baffle 50 faces the rear surface 9b of the differential gear 9, and the upper outer circumferential rib 53 and the lower outer circumferential rib 55 are arranged so as to surround a portion on the lower right side and a portion on the upper left side of the outer circumferential end surface of the differential gear 9 in an arc shape, respectively, when viewed from the front surface 51a side of the body 51.

As shown in fig. 2, an oil reservoir 13 for storing the hydraulic oil in the machine chamber 10 is formed between the rear surface 51b of the baffle 50 and the inner surface of the casing 3 facing the rear surface. The No. 1 flow guide part 61 of the baffle 50 is disposed to cover the oil reservoir 13. In addition, the lower end portion 61b of the 1 st deflector 61 protrudes above the control chamber 30.

Further, in a state where the baffle 50 is provided in the machine chamber 10, the notch 56 formed in the lower outer circumferential rib 55 is disposed between the partition wall 3a and the side surface 3b of the housing 3. Also, in this state, a gap for defining the communication passage 20 is formed between the side surface 3b of the housing 3 and the cutout portion 56.

Fig. 8 to 10 are diagrams for explaining the flow of the working oil in the machine chamber by the baffle 50. As shown by the arrows in fig. 8, the hydraulic oil that has been lifted up by the rotation of the differential gear 9 in the machine chamber 10 tends to flow down into the machine chamber 10 again. In contrast, in the present embodiment, by providing the 1 st deflector 61 on the baffle 50, the working oil that attempts to flow down into the machine chamber 10 can be received by the 1 st deflector 61. The working oil caught by the 1 st flow guide 61 flows along the 1 st flow guide 61 from the upper end portion 61a side to the lower end portion 61b side, and then flows down into the control chamber 30 from the lower end portion 61 b.

By providing the 1 st deflector 61 on the baffle 50 in this way, the oil lifted up by the differential gear 9 in the machine chamber 10 is caught by the 1 st deflector 61 and flows into the control chamber 30 along the 1 st deflector 61. Accordingly, the oil level L2 of the control chamber 30 rises, and therefore the oil suction port can be prevented from being exposed from the oil level L2. Therefore, the suction of air (air) at the oil suction port can be prevented, and the inflation performance (air suction prevention performance) can be improved.

In the baffle 50, the 1 st deflector 61 is a plate-like projecting piece inclined so as to gradually descend from the upper portion of the machine room 10 toward the upper portion of the control room 30. As shown by the arrows in fig. 8, according to this structure, the oil that is lifted up by the differential gear 9 in the machine chamber 10 can naturally flow down along the 1 st flow guide 61 by gravity, and can be reliably guided to the control chamber 30.

Further, as shown in fig. 9, when the transmission is in a state in which the vehicle is moving forward, by providing the through-hole 57, the No. 2 flow guide portion 63, and the wall portion 65 in the baffle 50, when the oil accumulated in the bottom portion of the machine chamber 10 is kicked up by the rotation of the differential gear 9, the kicked-up oil is guided from the front surface 51a side to the rear surface 51b side of the main body portion 51 through the slit-shaped through-hole 57 as shown in fig. 3 and 9. This oil is guided to the gear spline (shaft support portion) 9a on the differential shaft 6 along the 2 nd flow guide portion 63 provided on the back surface 51b of the main body portion 51. The working oil that has flowed into the back surface 51b of the baffle 50 may overflow through a gap between the 1 st flow guide portion 61 of the baffle 50 and the inner surface of the housing 3, and the working oil that has overflowed through the gap is guided along the wall portion 65 to the shaft support portion 9a on the differential shaft 6 due to the structure of the wall portion 65 that is provided above the through-hole 57 and extends from the 1 st flow guide portion 61 to the outer edge of the shaft support portion 9a near the 2 nd flow guide portion 63. In other words, the kicked up oil can be reliably absorbed by the wall portion 65 and flow into the shaft supporting portion 9 a. Thus, when the transmission is in a state in which the vehicle is moving forward, the flow rate of the lubricating oil supplied to the gear spline 9a on the differential shaft 6 can be effectively increased, and smooth operation and strength durability of the components such as the differential gear 9 in the housing 3 can be improved.

In the present embodiment, even when the transmission is in the vehicle reverse state, the flow rate of the lubricating oil supplied to the gear spline 9a on the differential shaft 6 can be effectively increased by providing the through hole 57, the No. 2 guide portion 63, and the wall portion 65 described above in the baffle 50. When the transmission is in a vehicle reverse state, the rotational speed of the gears including the differential gear 9 is reduced as compared with when the vehicle is moving forward, and the flow rate of the hydraulic oil is reduced at this time. When the hydraulic oil is kicked up in a state where the transmission is in a vehicle backward traveling state, the kicked-up oil is guided from the front surface 51a side to the rear surface 51b side of the main body 51 through the slit-shaped through-holes 57, as in a state where the vehicle is moving forward. The oil is guided to the shaft support portion 9a along the 2 nd flow guide portion 63 provided on the back surface 51b of the main body portion 51. By the structure of the wall portion 65, the hydraulic oil that has flowed into the rear surface 51b of the baffle 50 is guided to the shaft support portion 9a on the differential shaft 6 along the wall portion 65. In other words, the kicked up oil can be reliably absorbed by the wall portion 65 and flow into the shaft supporting portion 9 a. Accordingly, when the transmission is in the vehicle reverse state, the flow rate of the lubricating oil supplied to the gear spline 9a on the differential shaft 6 can be effectively increased, and smooth operation and strength durability of the various components such as the differential gear 9 in the housing 3 can be improved.

As shown in fig. 10, a part of the oil in the control chamber 30 returns to the machine chamber 10 through a communication passage (oil inflow portion) 20 provided between the machine chamber 10 and the control chamber 30. In the present embodiment, the size of the communication passage 20 (the size of the cutout portion 56) can be set regardless of the stress (strength) required for the housing 3 by forming the cutout portion 56 for the communication passage 20 in the baffle 50. Therefore, the oil flowing from the control chamber 30 into the machine chamber 10 through the communication passage 20 can be restricted to a desired flow rate, and therefore, the stirring resistance of the oil in the machine chamber 10 can be effectively reduced.

As shown in fig. 2, in the transmission 1 of the present embodiment, the body portion 51 of the baffle 50 is interposed between the differential gear 9 and the oil reservoir 13 so as to separate them from each other. This prevents the oil in the oil reservoir 13 from contacting the differential gear 9. Therefore, the stirring resistance of the oil in the machine chamber 10 due to the rotation of the differential gear 9 can be reduced.

Further, in the baffle 50, a recessed portion 58 for taking oil kicked up by the differential gear 9 into the through hole 57 is provided below the through hole 57 of the front surface (surface on the differential gear 9 side) 51a of the main body portion 51. By providing the recessed portion 58, the oil kicked up by the differential gear 9 can be taken into the through-hole 57 more efficiently. Therefore, the flow rate of the lubricating oil supplied to the gear spline 9a on the differential shaft 6 through the 2 nd flow guide portion 63 can be more effectively increased.

While the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and various modifications can be made within the scope of the technical ideas described in the claims, the description and the drawings. For example, the specific structure of the transmission shown in the above embodiment is an example, and the baffle of the present invention can also be applied to transmissions of other structures. The specific shape of the baffle is also an example, and as long as the baffle of the present invention is a baffle provided so as to separate the differential gear and the oil reservoir and includes portions corresponding to the above-described 1 st flow guide portion, the through hole, the 2 nd flow guide portion, the wall portion, and the cutout portion, the specific shape may be a shape other than the shape shown in the above-described embodiment.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications or substitutions do not depart from the scope of the present invention in its spirit.

Claims (6)

1. A baffle plate (50) provided in a transmission (1) so as to separate a differential gear (9) from an oil reservoir (13), the transmission (1) comprising: a machine chamber (10) that is defined within the housing (3) and that houses a plurality of gears including the differential gear (9); a control chamber (30) that is disposed adjacent to the machine chamber (10) in the housing (3) and that houses a mechanism for hydraulic control; and the oil reservoir (13) formed between an inner side surface of the housing (3) and a side surface of the differential gear (9) in the machine chamber (10), the baffle plate (50) being characterized in that:

the baffle (50) is provided with:

a body (51) disposed on a side of the differential gear (9);

a1 st flow guide portion (61) formed on a surface (51b) of the main body portion (51) on the oil reservoir portion (13) side, for guiding oil raised by the differential gear (9) in the machine chamber (10) to the control chamber (30);

an outer circumferential rib (55) formed on a part of the outer circumference of the main body portion (51);

a cutout portion (56) provided on the outer circumferential rib (55), a communication passage (20) that allows oil to flow from the control chamber (30) into the machine chamber (10) being defined between the cutout portion (56) and an inner surface of the housing (3);

a slit-shaped through-hole (57) formed in the main body portion (51), the through-hole (57) being arranged such that the through-hole (57) partially overlaps with the tooth profile of the differential gear (9) when viewed in the axial direction of the differential gear (9);

a2 nd flow guide portion (63) formed below the through hole (57) on the surface (51b) of the main body portion (51) on the oil reservoir portion (13) side, and guiding the oil raised by the differential gear (9) and passing through the through hole (57) to a shaft support portion (9a) of the differential gear (9); and

and a wall portion (65) that is formed above the through-hole (57) in the surface (51b) of the main body portion (51) on the oil reservoir portion (13) side, extends from the 1 st flow guide portion (61) toward the shaft support portion (9a) of the differential gear (9), and guides oil that is lifted by the differential gear (9) toward the shaft support portion (9a) of the differential gear (9).

2. The baffle plate according to claim 1, wherein the 1 st flow guide portion (61) is a plate-shaped projecting piece that is inclined so as to gradually descend from an upper portion of the machine chamber (10) toward an upper portion of the control chamber (30).

3. The baffle plate according to claim 1, wherein the wall portion (65) is a plate-like projecting wall that projects in the axial direction of the differential gear (9) on the oil reservoir portion (13) -side face of the main body portion (51).

4. The baffle plate according to claim 3, wherein a1 st end (65a) of the wall portion (65) is connected to the 1 st flow guide portion (61), a2 nd end (65b) of the wall portion (65) is connected to the shaft support portion (9a), and a projecting length of the 1 st end (65a) of the wall portion (65) is larger than a projecting length of the 2 nd end (65b) in an axial direction of the differential gear (9).

5. The baffle plate according to claim 1, wherein a recessed portion (58) is provided on a lower side of the through hole (57) on the differential gear (9) -side surface (51a) of the main body portion (51), the recessed portion being formed continuously with the through hole (57) by recessing the differential gear (9) -side surface (51a) to a deep side in an axial direction.

6. A transmission (1) characterized in that:

the transmission (1) is provided with a baffle (50) according to any one of claims 1 to 5.

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