KR20140009076A - Lubricating oil discharge structure for transmission case - Google Patents

Abstract

The purpose of the present invention is to prevent a discharge of lubricating oil inside a pulley chamber (20) from being decreased. A valve receiving unit (30) receiving a control valve body is installed on the lower part of the pulley chamber (20) receiving a transmission mechanism unit of a belt type continuously variable transmission. Discharge holes (11a, 11b, 11c) of lubricating oil which lubricates the transmission mechanism unit is formed on a boundary wall unit (111) between the pulley chamber (20) and the valve receiving unit (30) and connected to the valve receiving unit (30). A differential receiving unit (60) receiving a final gear (F) where the output rotation of a secondary pulley (Pb) is inputted is formed on the transmission case installed at the position offset from the pulley chamber (20) in a rotary shaft direction of the final gear (F). The discharge hole (11c) is formed on the boundary wall unit (111) around the differential receiving unit in the rotary shaft direction.

Description

Lubricant discharge structure in transmission case {LUBRICATING OIL DISCHARGE STRUCTURE FOR TRANSMISSION CASE}

The present invention relates to a lubricating oil discharge structure in a transmission case of a belt type continuously variable transmission.

6 is a view illustrating a transmission case 100 of a vehicular belt continuously variable transmission, (a) is a plan view of the transmission case 100 viewed from the opposite side to the torque converter, and (b) is a transmission case 100. This is a plan view seen from the torque converter side.

FIG. 7: is sectional drawing A-A in FIG. 6 (a), (a) is the thickness direction of the transmission case 100 in the step before the rotation speed of a final gear F reaches a maximum rotation speed. It is a figure explaining the height distribution of the lubricating oil, (b) demonstrates the height distribution of the lubricating oil in the thickness direction of the transmission case 100 when the rotation speed of final gear F reaches the maximum rotation speed. Drawing.

As shown in Fig. 6A, in the transmission case 100 of the vehicular belt type continuously variable transmission, the transmission mechanism portion (primary pulley, secondary pulley, belt) is disposed on the surface opposite to the torque converter (not shown). The pulley chamber 101 for accommodating this is provided.

The pulley chamber 101 is formed inside the annular circumferential wall part 104 as viewed in the axial direction, and inside the circumferential wall part 104, the receiving part of the primary pulley (primary pulley receiving part ( 102) and the accommodating portion (secondary pulley accommodating portion 103) of the secondary pulley are provided side by side in the width direction of the transmission case 100.

As shown in FIG. 6B, the outer circumference of the transmission case 100 is formed on the entire circumference on a surface on the side opposite to the pulley chamber 101 in the transmission case 100 (surface on the torque converter side). An annular circumferential wall portion 107 enclosed is provided, and inside the circumferential wall portion 107, a valve accommodating portion 106 accommodating the control valve body and a accommodating portion 108 of the forward and backward switching mechanism. The clutch accommodating part 109 and the differential accommodating part 110 are provided open to the torque converter side (ground front side) which is not shown in figure.

The accommodation part 108 is located on the opposite side to the primary pulley accommodation part 102 (refer to FIG. 6 (a)), and the valve accommodation part 106 is located in the lower part of this accommodation part 108.

The valve accommodating part 106 is formed by expanding more than the primary pulley accommodating part 102 and the partition wall part 108a of the accommodating part 108 in the paper inner side in FIG.6 (b), and FIG. As shown to (a) of the above, above-mentioned primary pulley accommodating part 102 is located above this expanded part.

In the peripheral wall part 104 which surrounds the primary pulley accommodating part 102, the primary pulley accommodating part 102 and the valve accommodating part 106 are located in the boundary wall part 104a which becomes a boundary with the valve accommodating part 106. FIG. And discharge holes 102a and 102b (see FIG. 6) are formed, and lubricating oil lubricating the primary pulley and the secondary pulley in the pulley chamber 101 passes through these discharge holes 102a and 102b to form a valve. It is discharged | emitted to the accommodating part 106 side.

As shown in Fig. 6B, the clutch accommodating portion 109 is located on the opposite side of the secondary pulley accommodating portion 103, and the front side of the ground of the clutch accommodating portion 109 (torque converter) is shown. On the lower side of the side), the differential accommodation portion 110 is located.

In the transmission case 100, the differential accommodation portion 110 is provided at a position offset in the direction away from the secondary pulley accommodation portion 103 (pulley chamber 101) in the axial direction of the axis X3. In the differential accommodating part 110, the final gear F shown with the virtual line in a figure is provided so that rotation is possible about the axis X3.

In the pulley chamber 101 described above, primary pulleys (not shown) and secondary pulleys (not shown) are rotatably provided around the axes X1 and X2, respectively. When the rotational driving force of the engine input to the primary pulley is transmitted to the secondary pulley through the belt (not shown), the transmitted rotational driving force is applied to the reduction gear (not shown) located in the clutch accommodating portion 109. It enters into the final gear F through it, and the final gear F is made to rotate about axis X3.

Here, when the lubricating oil which lubricates the primary pulley and the secondary pulley stays in the pulley chamber 101, it becomes a friction (rotational resistance) of a primary pulley and a secondary pulley.

For this reason, various studies have been made to enable the lubricant oil in the pulley chamber 101 to be quickly discharged to the valve receiving portion 106 side (for example, Patent Document 1).

In the transmission case 100 shown to FIG. 6, FIG. 7, the boundary wall part 104a of the primary pulley accommodating part 102 and the valve accommodating part 106 is made into the lubricating oil which lubricated the primary pulley and the secondary pulley. The valve accommodating part 106 is discharged | emitted from the discharge holes 102a and 102b which were formed in this.

Japanese Patent Application Laid-Open No. 2000-073724

Here, when the behavior of the lubricating oil in the transmission case 100 is analyzed, when the final gear F rotates, the height distribution of the lubricating oil in the transmission case 100 is changed, and the discharge of the lubricating oil from the pulley chamber 101 is affected. Found to receive.

Specifically, in the transmission case 100, the lubricating oil is filled up to the height of the virtual line Im1 shown in Fig. 6B, and this virtual line Im1 is a case where the final gear F is not rotating. The height distribution of lubricating oil is shown.

From this state, when the final gear F rotates in the clockwise direction in the figure, the lubricant in the differential accommodating part 110 is scraped up by the final gear F, and the scraped up lubricant is the transmission case 100. In the width direction (diameter direction of axis X3) in the widthwise direction (axial direction of axis X3) of the valve receiving portion 106 and the receiving portion 108 adjacent to the differential receiving portion 110 or the transmission case 100. It was found that the flow into the pulley chamber 101 (primary pulley receiving portion 102 in the case of Figure 7) in a position spaced apart from the differential receiving portion (110).

Here, since the amount of the lubricating oil flowing in increases as the rotation speed of the final gear F increases, the differential accommodating part 110 increases as the rotation speed of the final gear F increases in the width direction of the transmission case 100. The height of the lubricating oil of the side becomes low, and the height of the lubricating oil of the valve accommodating part 106 and the accommodating part 108 side becomes high.

Therefore, when the rotation speed of the final gear F which stopped was changed to the maximum rotation speed, the height distribution of the lubricating oil in the width direction of the transmission case 100 will be moved to the virtual line Im2 from the height distribution shown by the virtual line Im1. After passing through the height distribution shown, it becomes the height distribution shown by the virtual line Im3 finally.

In addition, in the thickness direction of the transmission case 100, as the rotation speed of the final gear F increases, the height of the lubricating oil on the side of the differential accommodating portion 110 decreases, and the primary pulley accommodating portion 102 (pulley) The height of the lubricating oil on the side of the seal 101 increases.

Therefore, when the rotation speed of the final gear F which stopped was changed to the maximum rotation speed, the height of the lubricating oil in the perpendicular direction of the rotating shaft (axial line X3) of the final gear F will change the intermediate position P2 from the initial position P1. After that, it will fall to the lowest position P3.

Then, the height distribution of the lubricating oil in the thickness direction of the transmission case 100 passes from the height distribution represented by the virtual line Im1 to the height distribution represented by the virtual line Im4, and finally to the height distribution represented by the virtual line Im5. (See FIG. 7).

Here, in the conventional transmission case 100 shown in Figs. 6 and 7, the discharge holes 102a and 102b are formed at positions spaced apart from the differential accommodation portion 110 in the thickness direction of the transmission case 100. This position is at the side where the oil level rises at the time of rotation of the final gear F (the position side spaced apart from the final gear F).

Therefore, when the height distribution of the oil surface is changed by the lubrication oil scraped up, the discharge hole 102a, 102b may be located below the oil surface, In this case, the valve accommodating part 106 from the pulley chamber 101 is carried out. The discharge of lubricant to the side is inhibited.

Accordingly, when the differential gear is rotated, the lubricant in the differential chamber is scraped up, and when the height distribution of the oil level in the transmission case is changed, it is required that the discharge of the lubricant in the pulley chamber (transmission mechanism portion accommodating portion) is not impeded. have.

The valve accommodating part which accommodates a control valve body is provided in the lower part of the transmission mechanism accommodating part which accommodates the transmission mechanism part of a belt type continuously variable transmission,

The discharge hole of the lubricating oil which lubricated the said shift mechanism part is formed in the boundary wall with the said valve accommodating part of the said shift mechanism accommodating part in communication with the said valve accommodating part,

In a transmission case provided at a position offset from the transmission mechanism accommodating portion in the rotation axis direction of the final gear, a gear accommodating portion for accommodating a final gear to which the output rotation of the transmission mechanism is input,

In the said boundary wall, it was set as the lubricating oil discharge structure in the transmission case of the structure in which the said discharge hole is formed in the position of the said gear accommodating part vicinity in the said rotating shaft direction.

In this configuration, since the height of the lubricating oil in the transmission case when the final gear is rotating increases as it is spaced apart from the final gear, the transmission mechanism at a position spaced apart from the final gear in the rotation axis direction of the final gear in the transmission case. In the accommodating portion, the discharging hole is formed at a position near the final gear, whereby the discharging hole is located below the oil surface of the lubricating oil when the final gear is rotating so that the lubricating oil in the transmission mechanism accommodating portion is not discharged to the valve accommodating side. Can be prevented appropriately.

1 is a perspective view of a transmission case according to an embodiment.
2 is a view for explaining a pulley chamber of a transmission case according to an embodiment.
3 is a view for explaining an opposite side of a pulley chamber of a transmission case according to an embodiment.
4 is a plan view of the transmission case according to the embodiment as seen from below.
5 is a sectional view of a transmission case according to an embodiment.
6 is a view for explaining a transmission case according to a conventional example.
7 is an essential part cross sectional view of a transmission case according to a conventional example.

Hereinafter, embodiments of the present invention will be described.

FIG. 1: is a perspective view of the transmission case 10 which concerns on embodiment, and with the transmission case 10, the final gear F assembled in this transmission case 10, and the main elements of a transmission mechanism part (primary pulley ( Pa), secondary pulley Pb, and belt V].

FIG. 2: is a figure explaining the pulley chamber 20 in the transmission case 10, (a) is a top view of the pulley chamber 20 side of the transmission case 10, (b) is a pulley chamber 20 It is a perspective view which expands and shows the part of the discharge hole 11a, 11b, 11c of lubricating oil in ().

As shown in FIG. 1, in the transmission case 10 of the vehicular belt type continuously variable transmission, the final body which rotates integrally with the differential case which is not shown from one side (torque converter side not shown) of the said transmission case 10 is shown. The gear F is assembled, and the transmission mechanism part formed by winding the belt V to the primary pulley Pa and the secondary pulley Pb is assembled from the other side.

As shown in FIG. 2, in the transmission case 10, the pulley chamber 20 is provided on the surface on the side opposite to the torque converter (not shown).

The pulley chamber 20 is formed inside the annular peripheral wall portion 11 as viewed in the axial direction, and inside the peripheral wall portion 11, the receiving portion (primary pulley) of the primary pulley Pa is formed. The accommodating part 21 and the accommodating part (secondary pulley accommodating part 22) of the secondary pulley Pb are provided in the width direction of the transmission case 10 side by side.

The primary pulley Pa and the secondary pulley Pb are rotatably installed in the primary pulley accommodating portion 21 and the secondary pulley accommodating portion 22, respectively, around the axis X1 and the axis X2 parallel to each other. When the rotational driving force of the engine (not shown) is input to the primary pulley Pa, the rotational driving force is applied to the secondary pulley Pb side through the belt V that spans the primary pulley Pa and the secondary pulley Pb. It is supposed to be delivered.

The bottom wall portion 21a of the primary pulley accommodating portion 21 has a low width of the secondary pulley accommodating portion 22 in order to secure the stroke width in the axis X1 direction of the movable cone plate (not shown) of the primary pulley Pa. It is located in the paper inner side rather than the wall part 22a, and these bottom wall parts 21a and 22a are connected by the side wall part 221 extended in the axial line X1 direction.

3 is a plan view of the transmission case 10 viewed from the torque converter side, and (a) shows a valve accommodation portion 30, a mounting portion 40, and a clutch accommodation portion 50 located inside the peripheral wall portion 12. ), And the positional relationship between the differential accommodating portion 60, (b) briefly indicates the torque converter side of the transmission case 10, and the pulley chamber 20 of the transmission case 10; The peripheral wall part 11 etc. which are located in the side are shown with a hidden line, and it is a figure explaining the positional relationship of these and the communication holes 62 and 63 formed in the differential accommodating part 60. As shown in FIG.

In addition, in FIG.3 (a), it is the height distribution of the lubricating oil in the transmission case 10, The height distribution when the final gear F is not rotating is the imaginary line Im1, and the final gear F rotates the maximum. The height distribution at the time of rotation by a number is shown by the virtual line Im3, respectively.

On the surface on the side opposite to the pulley chamber 20 in the transmission case 10 (surface on the torque converter side), an annular peripheral wall portion 12 surrounding the outer periphery of the transmission case 10 over its entire circumference is provided. It is provided, and inside this peripheral wall part 12, the valve accommodating part 30, the attaching part 40 of a forward / backward switching mechanism (not shown), and the clutch accommodating part of a sub transmission mechanism (not shown) are provided. 50 and the differential accommodating part 60 are open to the torque converter side which is not shown in figure.

In the center portion of the mounting portion 40, an insertion through hole 40b through which an input shaft (not shown) of the primary pulley Pa (see FIG. 1) is inserted is formed, and below this insertion hole 40b. The recessed hole 40c for supporting the rotating shaft of a forward-backward switching mechanism (not shown) is located in this. The holding portions 40d, 40d, 40e, and 40e of the forward and backward switching mechanism are provided around the recess hole 40c and around the insertion through hole 40b.

The valve accommodating part 30 which accommodates a control valve body (not shown) is located in the lower part of the mounting part 40, and this valve accommodating part 30 is the said mounting part 40 and the primary pulley accommodating part. More than the bottom wall part 21a used as the partition wall of (21), it expands and forms in the inner side of the paper surface in FIG.

In the transmission case 10, the inner side of the valve accommodating part 30 is located in the lower part of the primary pulley accommodating part 21, and the valve accommodating part in the peripheral wall part 11 of said pulley chamber 20 ( At the portion (boundary wall portion 111: see FIG. 5) which becomes a boundary with 30, discharge holes 11a, 11b, and 11c are formed in communication with the primary pulley accommodation portion 21 and the valve accommodation portion 30. (See FIG. 2, FIG. 5).

Here, as shown in Fig. 2B, the discharge holes 11a and the discharge holes 11b are formed at intervals in the circumferential direction of the peripheral wall portion 11 (boundary wall portion 111), The discharge hole 11b is located on the side of the bottom wall portion 21a on the side of the secondary pulley receiving portion 22 than the discharge hole 11a. Moreover, the discharge hole 11c is located in the bottom wall part 21a side rather than the discharge hole 11b, and this discharge hole 11c is closer to the side wall part 221 of the primary pulley accommodating part 21. Formed.

As shown to Fig.2 (a), in the lower part of the peripheral wall part 11 which divides the pulley chamber 20, the boundary side of the primary pulley accommodating part 21 and the secondary pulley accommodating part 22 is shown. [Center side in the width direction of the transmission case 10] is located below in the height direction of the transmission case 10 than the both side parts 112 of the circumferential wall part 11.

Therefore, in the transmission case 10, the lubricating oil which lubricated the primary pulley Pa and the secondary pulley Pb is pulley chamber 101 (primary pulley accommodating part 21) along the peripheral wall part 11. After flowing to the discharge hole 11a, 11b, 11c side formed in the lower part of the inside, it is discharged to the valve accommodating part 106 through the discharge hole 11a, 11b, 11c.

And the lubricating oil discharged to the valve accommodating part 106 is collect | recovered finally by the oil pan (not shown) attached to the lower part of the valve accommodating part 106. FIG.

3, the clutch accommodating part 50 is located in the opposite side to the secondary pulley accommodating part 22, and this clutch accommodating part 50 is the bottom wall part 22a of the secondary pulley accommodating part 22. As shown in FIG. It protrudes to the front side of the paper surface, and is formed in a substantially cylindrical shape.

At the lower part of the front face side (torque converter side) of the clutch accommodating part 50, the differential accommodating part 60 which accommodates the final gear F is provided. The differential accommodating part 60 recesses and is formed in the paper inner side in FIG.3 (a), and defines the outer periphery of the differential accommodating part 60 in the peripheral wall part 12. Inside, the final gear F is accommodated.

In this differential accommodating part 60, the final gear F is rotatably installed around the axis X3 parallel to the axis of rotation (axis X1, X2) of said primary pulley Pa and secondary pulley Pb. When the output rotation of the secondary pulley Pb is input through the reduction gear which is not shown in figure, the final gear F is made to rotate integrally with the differential case which is not shown in figure.

As shown in FIG.3 (b), in the transmission case 10, the valve accommodating part 30 is formed over the back surface side (pulley chamber 20 side) of the differential accommodating part 60, As viewed from the side of the torque converter, the side wall part 301 of the differential accommodating part 60 side of the valve accommodating part 30 is located in the vicinity of the center opening 61a of the differential accommodating part 60. As shown in FIG.

In the inner wall portion 61 of the differential accommodating part 60, communication holes 62 and 63 are formed in the part where the valve accommodating part 30 is located in the vicinity of the valve accommodating part 30, and the differential The accommodation part 60 and the valve accommodation part 30 communicate with each other through the communication holes 62 and 63.

The communication hole 62 is located below the rotation axis (axis X3) of the final gear F, and the height of the lubricating oil when the final gear F is rotating at the maximum rotational speed (see the imaginary line Im3 in the drawing). It is formed in the position which becomes lower than the above.

The communication hole 63 is located above the rotation axis (axis line X3) of the final gear F. As shown in FIG. And this communication hole 63 is a position which becomes higher than the height of the lubricating oil (refer the imaginary line Im3 in drawing) when the final gear F is rotating by the maximum rotation speed, The valve accommodating part 30 and the pulley It is formed in the position close to the boundary wall part 111 of the chamber 20.

4 is a plan view of the transmission case 10 viewed from below, and shows bottom wall portions 21a and 22a of the primary pulley accommodating portion 21, the secondary pulley accommodating portion 22, and the primary pulley accommodating portion 21. It is a figure which shows typically the side wall part 221 with a hidden line.

As shown in FIG. 4, the valve housing portion 30 is opened on the lower surface of the transmission case 10, and a control valve body (s) is provided inside the peripheral wall portion 13 partitioning the valve housing portion 30. Mounting portions 31, 32, and 33 (not shown) are provided to protrude toward the front of the page.

The discharge hole 11a, 11b, 11c mentioned above is open in the part corresponded to the primary pulley accommodating part 21, and it is the side of the bottom wall part 21a in this part, and the primary pulley accommodating part 21 ) And the discharge hole 11c is formed in the vicinity of the side wall part 221 which divides the secondary pulley accommodation part 22.

The discharge hole 11c in the primary pulley accommodating part 21 is the final gear F in the radial direction (width direction of the transmission case 10) and the axial direction of the rotation axis (axis X3) of the final gear F. In FIG. It is formed in the position from which the separation distance from () becomes the smallest.

5 shows the height distribution (virtual line Im5) of the lubricating oil in the thickness direction of the transmission case when the rotation speed of the final gear F reaches the maximum rotation speed, and the positions of the discharge holes 11a, 11b, 11c. It is a figure explaining a relationship, (a) is AA sectional drawing in FIG.2 (a), (b) is BB sectional drawing in FIG.2 (a).

In the thickness direction (axial direction of axis X3) of the transmission case 10, as the rotation speed of the final gear F increases, the height of the lubricating oil on the side of the differential accommodating portion 60 decreases, and the primary pulley accommodating portion (21) The height of the lubricating oil on the [pulley chamber 20] side is increased.

When the inclination in the axis X3 direction of the lubricating oil at the time when the rotation speed of the final gear F is the maximum rotation speed is shown as a straight line crossing the horizontal line for convenience, as shown in FIG. 5, the final gear F It is a straight line starting from the intersection P3 of the horizontal line (virtual line Im3) which passes the height position of the lubricating oil in the differential accommodating part 60 at the time of maximum rotation, and the surface Fa of the pulley chamber 20 side of the final gear F. It can be represented by the straight line (virtual line Im5) from which the height from the horizontal line (virtual line Im3) becomes high as it goes to the pulley chamber 20 side from the final gear F. As shown in FIG.

In embodiment, above-mentioned discharge hole 11c is formed in the position on the final gear F side rather than the intersection of this virtual line Im3 and said boundary wall part 111. As shown in FIG.

That is, when the final gear F rotates around the axis X3, it is a position of the side where the height of the oil surface in the primary pulley accommodation portion 21 becomes lower, and the final gear F rotates at the maximum rotational speed. At this time, even if a situation in which the lubricating oil is biased toward the primary pulley accommodating portion 21 and the separation distance from the final gear F increases, the lubricating oil becomes high, does not become the lower side of the oil level of the lubricating oil. , The discharge hole 11c is formed.

Therefore, it is appropriately prevented that the lubricating oil in the pulley chamber 200 is not discharged | emitted to the valve accommodating part 30 side at the time of maximum rotation of the final gear F. As shown in FIG.

Here, when the final gear F rotates clockwise in the figure, the pressure in the region in the vicinity of the communication hole 63 in the differential accommodating portion 60 is lower than that of other portions (see FIG. 3).

In embodiment, since the communication hole 63 which connects the differential accommodating part 60 and the valve accommodating part 30 is formed in the uppermost position of the vicinity of the primary pulley accommodating part 21, it is shown in FIG. As described above, the communication hole 63 and the discharge hole 11c for communicating the primary pulley accommodation portion 21 and the valve accommodation portion 30 are located close to each other (see FIG. 4).

Therefore, when the pressure in the vicinity of the communication hole 63 in the differential accommodating part 60 is lowered, the gas (fluid) in the vicinity of the communication hole 63 in the valve accommodating part 30 becomes a differential accommodating part. Pulled toward the (60) side (see arrow Fr in the drawing), the pressure in the vicinity of the communication hole 63 in the valve accommodation portion 30 is lower than in other regions.

In this case, a negative pressure condition is also generated in the vicinity of the discharge hole 11c adjacent to the communication hole 63, and the lubricant in the primary pulley receiving portion 21 chamber is sucked to the discharge hole 11c side, so that the primary pulley is accommodated. The lubricating oil in the chamber 21 can be discharged more effectively.

As mentioned above, in embodiment, the valve accommodating part 30 which accommodates a control valve body is provided in the lower part of the pulley chamber 20 which accommodates the transmission mechanism part of a belt type continuously variable transmission,

Lubricant discharge holes 11a, 11b, 11c lubricating a shift mechanism portion (primary pulley Pa, secondary pulley Pb, etc.) to the boundary wall portion 111 with the valve accommodating portion 30 of the pulley chamber 20. ) Is in communication with the valve housing portion 30 is formed,

The position where the differential accommodating part 60 which accommodates the final gear F into which the output rotation of the secondary pulley Pb is input is offset from the pulley chamber 20 in the rotation axis (axis X3) direction of the final gear F. In FIG. In the transmission case 10 installed in,

In the boundary wall part 111, it is a position near the differential accommodating part 60 in a rotation axis direction, and the lubricating oil discharge | discharges in the transmission case of the structure with which the discharge hole 11c is formed in the vicinity of the bottom wall part 21a. It was made into a structure.

If comprised in this way, since the height of the lubricating oil in the transmission case 10 when the final gear F is rotating increases as it moves away from the final gear F, the final gear F in the transmission case 10 is carried out. In the pulley chamber 20 at a position spaced apart from the final gear F in the direction of the rotation axis, the discharge hole 11c is formed at a position near the final gear F (differential receiving portion 60), When the final gear F is rotating, the discharge hole 11c is located below the oil surface of the lubricating oil so that the lubricating oil in the pulley chamber 20 can not be prevented from being discharged to the valve receiving portion 30 side. have.

Thereby, since lubricating oil can be prevented from remaining in the pulley chamber 20 and the friction of the rotation of the primary pulley Pa and the secondary pulley Pb, the lubricating oil will be prevented from the primary pulley Pa and the secondary pulley ( The occurrence of a problem caused by friction of rotation of the Pb), that is, a problem that the fuel efficiency is deteriorated can be properly prevented.

The position of the discharge hole 11c in the axis X3 direction is the inclination of the lubricating oil in the rotation axis (axis X3) direction of the final gear F in the transmission case 10, and the maximum rotation of the final gear F It is set to the position near the differential accommodation part 60 (final gear F) rather than the intersection of the straight line Im5 which shows the inclination of the city, and the boundary wall part 111,

The straight line Im5 is a horizontal line passing through the height position Im3 (height position in the vertical direction of the axis X3) of the lubricating oil in the differential accommodation portion 60 at the time of maximum rotation of the final gear F, and the final gear F It was a straight line made into the starting point of the intersection P3 with the surface Fa on the pulley chamber 20 side, and it was set as the straight line structure from which the height from a horizontal line becomes high as it is spaced apart from the final gear F to the pulley chamber 20 side.

As a result of the analysis, the distribution of the height direction of the oil level of the lubricating oil in the thickness direction (axis line X3) of the transmission case 10 is substantially contained within the predetermined range on the basis of the above-mentioned imaginary line Im5, and thus is configured as described above. In this case, the discharge hole 11c is located below the oil surface of the lubricating oil at the time of the maximum rotation of the final gear F so that the lubricating oil in the pulley chamber 20 is not discharged to the valve accommodating portion 30 side. It can prevent.

The differential accommodating part 60 and the valve accommodating part 30 are provided adjacently in the width direction of the transmission case 10, and the valve accommodating part 30 of the differential accommodating part 60 is seen from the axis X3 direction. ) Side is provided so as to overlap with the valve housing portion 30,

It is a part overlapping with the valve accommodating part 30 in the differential accommodating part 60, and the differential accommodating part 60 is located in the upper position near the boundary wall part 111 of the pulley chamber 20 and the valve accommodating part 30. FIG. ) And a communication hole 63 for communicating the valve housing portion 30 with each other.

If comprised in this way, the communication hole 63 which communicates the differential accommodating part 60 and the valve accommodating part 30, and the discharge hole 11c which communicates the primary pulley accommodating part 21 and the valve accommodating part 30 will be communicated. ) Are located close to each other (see FIG. 4).

Here, when the final gear F rotates in the clockwise direction in the figure, the pressure in the region in the vicinity of the communication hole 63 in the differential accommodating portion 60 is lower than that of other portions, and the valve accommodating portion 30 The gas (fluid) in the vicinity of the communication hole 63 is pulled toward the differential receiving portion 60 side, and the pressure in the vicinity of the communication hole 63 in the valve receiving portion 30 is lower than in other regions.

In this case, a negative pressure condition is caused also in the vicinity of the discharge hole 11c adjacent to the communication hole 63, and the lubricating oil in the primary pulley accommodating portion 21 is sucked toward the discharge hole 11c side. (21) It becomes possible to discharge the lubricating oil in the (pulley chamber 20) more effectively.

In addition, when the lubricant oil stirred in the final gear F and flowed into the pulley chamber 20 stays in the pulley chamber 20, the primary pulley Pa and the secondary pulley Pb that rotate in the pulley chamber 20. Is further agitated to form a lubricant containing a lot of air. When this lubricant containing a large amount of air is recovered to an oil pan (not shown) via the valve receiving portion 30 and then sucked by the oil pump and used for the fastening of the frictional fastening element, there is a fear of causing a fastening shock or the like. have.

By configuring as described above, it is possible to appropriately prevent the occurrence of such a problem by preventing the lubricating oil from remaining in the pulley chamber.

In the pulley chamber 20, the primary pulley accommodating part 21 and the secondary pulley accommodating part 22 are provided adjacent in the width direction of the transmission case 10, and the valve accommodating part 30 is a primary It is provided in the lower part of the pulley accommodating part 21, and the final gear F is located in the side of the secondary pulley accommodating part 22 side of the valve accommodating part 30,

The discharge hole 11c is a position in the vicinity of the secondary pulley accommodation portion 22 in the radial direction of the axis X3 in the boundary wall portion 111 with the valve accommodation portion 30 of the primary pulley accommodation portion 21. It was set as the structure formed in the vicinity of the side wall part 221 which divides the primary pulley accommodating part 21 and the secondary pulley accommodating part 22. As shown in FIG.

Since the height of the lubricating oil in the transmission case 10 when the final gear F is rotating increases as it is separated from the final gear F, the configuration as described above and the final gear F in the transmission case 10 are configured. In the primary pulley receiving portion 21 at a position spaced apart from the final gear F in the radial direction of the rotation axis of the rotary shaft, the discharge hole 11c is positioned near the rotation axis (the axis X3) of the final gear F. The discharge hole 11c is positioned below the oil level of the lubricating oil when the final gear F is rotated by forming at the position, that is, near the side wall portion 221 in the primary pulley accommodation portion 21. Thus, it is possible to appropriately prevent the lubricating oil in the pulley chamber 20 from being discharged to the valve receiving portion 30 side.

Therefore, since it can respond to the change of the height distribution of the lubricating oil in the axial direction and the radial direction of the rotary shaft of the final gear F, the lubricating oil stays in the pulley chamber 20, and the primary pulley Pa and the secondary are The friction of the rotation of the pulley Pb can be prevented more reliably.

10: transmission case
11: surrounding wall
111: boundary wall (boundary wall)
11a to 11c: discharge hole
12: peripheral wall
13: surrounding wall
20: pulley room (transmission mechanism accommodation)
21: primary pulley receiving portion
21a: bottom wall
22: secondary pulley receiver
22a: bottom wall
221: side wall portion
30: valve receiving part
30: receiving part
301: side wall
31 to 33: mounting portion
40: mounting portion
40b: insertion through hole
40c: concave hole
40d, 40e: holding part
50: clutch receiving part
60: differential accommodation portion (gear accommodation portion)
61: wall
61a: center opening
62: communication hole
63: communication hole
100: transmission case
101: pulley room
102: primary pulley receiving portion
102a, 102b: discharge hole
103: secondary pulley receiving unit
104: surrounding wall
104a: boundary wall
106: valve receiving portion
107: peripheral wall
108: receiver
108a: partition wall portion
109: clutch receiving portion
110: differential accommodation
F: Final gear
P1: primary pulley
P2: Secondary Pulley
V: Belt
X1: axis
X2: axis
X3: axis

Claims (4)

The valve accommodating part which accommodates a control valve body is provided in the lower part of the transmission mechanism accommodating part which accommodates the transmission mechanism part of a belt type continuously variable transmission,
The discharge hole of the lubricating oil which lubricated the said shift mechanism part is formed in the boundary wall with the said valve accommodating part of the said shift mechanism accommodating part in communication with the said valve accommodating part,
In a transmission case provided at a position offset from the transmission mechanism accommodating portion in the rotation axis direction of the final gear, a gear accommodating portion for accommodating a final gear to which the output rotation of the transmission mechanism is input,
In the said boundary wall, the said discharge hole is formed in the position of the gear accommodating part vicinity in the said rotating shaft direction, The lubricant discharge structure in the transmission case characterized by the above-mentioned. The position of the discharge hole in the rotation axis direction,
The inclination of the lubricating oil in the rotation shaft direction in the transmission case is set to a position near the gear accommodating portion rather than an intersection of a straight line representing the inclination at the maximum rotation of the final gear and the boundary wall,
The straight line is a straight line at the intersection of the horizontal line passing through the height position of the lubricating oil in the gear accommodating portion at the maximum rotation of the final gear and the surface of the transmission mechanism accommodating portion side of the final gear, and the final The lubricating oil discharge structure in the transmission case characterized by being a straight line from which a height from said horizontal line becomes high as it is spaced apart from a gear toward the said transmission mechanism accommodation part side. The said gear accommodating part and the said valve accommodating part are provided adjacent in the width direction of the said transmission case, and the said valve accommodating part side of the said gear accommodating part is a thing seen from the said rotating shaft direction. Is installed to overlap with the valve receiving portion,
It is a part which overlaps with the said valve accommodating part in the said gear accommodating part, Comprising: The communication hole which communicates the said gear accommodating part and the said valve accommodating part is formed in the position near the boundary wall of the said transmission mechanism accommodating part and the said valve accommodating part. A lubricant discharge structure in a transmission case characterized by the above-mentioned. The transmission mechanism accommodating part according to claim 1 or 2, wherein the accommodating part of the primary pulley and the accommodating part of the secondary pulley are provided adjacent to each other in the width direction of the transmission case,
The valve accommodating portion is provided below the accommodating portion side of the primary pulley, and the final gear is located on the side of the accommodating portion side of the primary pulley of the valve accommodating portion,
In the transmission case, the discharge hole is formed at a position in the vicinity of the accommodation portion of the secondary pulley in the radial direction of the rotational axis on the boundary wall of the accommodation portion of the primary pulley. Lubricant discharge structure.

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