JP7384599B2 - Transmission lubrication structure - Google Patents

Description

The present invention relates to a transmission lubrication structure in which oil scooped up by gears provided in a transmission case is collected by a bucket-shaped oil receiver and guided toward a lubricated part.

Conventionally, various types of transmissions, such as manual transmissions, have been configured to supply oil (lubricating oil) inside the transmission case to parts that require lubrication, such as bearings and gears that support rotating shafts. There is. A configuration in which such oil is supplied through a gutter-shaped oil receiver disposed in the upper part of the transmission case is well known (see, for example, Patent Document 1).

There are three main functions of an oil receiver: collecting oil, storing oil, and supplying oil to areas where it is needed. There are two ways to collect oil: one is to extend a part of the oil receiver above the ring gear (also called differential ring gear) of the differential gear mechanism and directly collect the oil scooped up by the differential ring gear, and the other is to directly collect the oil scooped up by the differential gear. There are two methods to collect the oil that has been scooped up and scattered (including oil that has dripped from the transmission case).

JP2017-115976A

In the transmission lubrication structure disclosed in Patent Document 1, in order to efficiently capture the oil scooped up by the gears in the oil receiver, the oil receiver is formed diagonally upward from above the side wall of the tub. The extending upper eaves part is formed integrally with the tub part with a gap between it and the side wall part of the tub part, and the oil scraped up by the gear is captured on the lower surface of the upper eaves part, and the oil is transferred to the lower surface. A configuration is disclosed in which the particles are transmitted along the line and collected in a tub. However, in order to manufacture an oil receiver having such a shape by injection molding, a gap (opening) must be formed between the side wall part of the tub part and the upper eave part, as disclosed in Patent Document 1. In order to do this, it is necessary to use a slide type, which poses a problem in that the manufacturing cost of the oil receiver increases.

The technical object of the present invention is to provide a lubrication structure for a transmission that is improved by considering the above-mentioned current situation.

The present invention provides a lubrication structure for a transmission in which a bucket-shaped oil receiver collects oil scooped up by a gear provided in a transmission case and guides the oil toward a lubricated part. a receiver body having a passage that guides the collected oil toward the lubricated part; and a capturing member that is non-removably attached to the upper surface of the receiver body and has an inclined capturing surface that guides the captured oil to the passage. and a breather chamber of a breather mechanism that communicates between the inside and outside of the transmission case is provided on an inner wall of the transmission case, and the catching member connects the inside of the transmission case and the breather chamber. The gear is arranged between a hole that communicates with the gear .

According to the transmission lubrication structure of the present invention, by making the oil receiver an assembled type consisting of a receiver body and a capture member separate from the receiver body, the shape that is difficult to manufacture with a one-piece body can be reduced. It can be installed in the oil receiver at a low cost. Thereby, the inclined capturing surface portion of the capturing member can be arranged at a desired position and at a desired angle of inclination, and the oil scraped up by the gear can be actively and reliably captured. For example, by providing the inclined capturing surface part of the capturing member at a desired angle of inclination at a position where oil is scooped up in a low speed gear or reverse gear where a lot of oil is scooped up among the transmission gears, it can be used when climbing or descending a slope. Oil can be reliably collected in the oil receiver regardless of the condition. Furthermore, by making the oil receiver an assembly type, the receiver main body and the capturing member can be formed by injection molding at low cost without using a slide mold.

In the transmission lubrication structure of the present invention, the capturing member includes the inclined capturing surface portion whose base end side is connected to the receiver main body and extends diagonally upward, and the oil blocking portion extending diagonally downward from the tip of the inclined capturing surface portion. It may also be provided with the following.

According to this aspect, the capturing member has a function of not only capturing the oil scooped up by the gear but also preventing the oil scooped up by the gear from scattering to a desired location using the oil blocking portion. be able to. The shape of the capture member (approximately F-shape) can be achieved at low cost because the oil receiver is constructed in such a manner that the capture member is assembled to the receiver body.

For example, a breather chamber of a breather mechanism that communicates between the inside and outside of the transmission case is provided on an inner wall of the transmission case, and the oil blocking portion communicates between the inside of the transmission case and the breather chamber. The gear may be disposed between the gear and the gear.

According to this aspect, the oil blocking part prevents the oil scraped up by the gear from directly heading to the hole, so that the oil scraped up by the gear does not directly enter the hole or the oil scraped up by the gear goes directly to the hole. It is possible to prevent a large amount of oil from adhering around the hole and blocking the hole. In addition, it is possible to suppress oil from entering the breather chamber through the hole, and thereby to prevent oil from being ejected from the breather mechanism to the outside of the transmission case.

The transmission lubrication structure of the present invention allows an oil receiver that can actively and reliably collect oil scraped up by gears to be formed at low cost.

FIG. 2 is a schematic plan view of a manual transmission. It is a schematic perspective view of the same manual transmission. It is a skeleton diagram showing a power transmission system of the same manual transmission. FIG. 2 is a developed cross-sectional view showing a power transmission system of the manual transmission. FIG. 3 is a perspective view of the speed change gear mechanism and the switching mechanism with the main body and the lid separated. FIG. 3 is a plan view of the speed change gear mechanism and the switching mechanism with the main body and the lid separated. It is a side view of the speed change gear mechanism and the switching mechanism in a state where the main body part and the lid part are separated. FIG. 2 is an enlarged perspective view showing the relationship between a speed change gear mechanism and a switching mechanism. FIG. 3 is a side view showing a transmission gear mechanism, a switching mechanism, and an oil receiver. FIG. 3 is a plan view showing a speed change gear mechanism and an oil receiver. FIG. 3 is a rear view showing a speed change gear mechanism and an oil receiver. It is a side view showing an oil receiver and an oil guide together with a case main body. 15 is a side view showing the oil collection of the oil receiver taken along the line AA in FIG. 14; FIG. It is a top view showing an oil receiver. It is a perspective view showing an oil receiver. FIG. 15 is an enlarged perspective view showing the oil receiver taken along the line CC in FIG. 14; FIG. 3 is an enlarged perspective view for explaining the attachment structure of the capture member to the receiver main body, in which (A) is a view seen from diagonally above the left rear, and (B) is a view seen diagonally from above right front. It is a perspective view showing a breather mechanism and a capture member of an oil receiver. (A) is a perspective view of one front side of the oil guide, (B) is a perspective view of the back side of the oil guide, and (C) is a longitudinal cross-sectional view showing the peripheral portion of the oil guide and the oil guide holding portion. FIG. 3 is a cross-sectional view showing the vicinity of the oil guide mounting position in the case body, with (A) showing the assembled state and (B) showing the separated state.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments embodying the present invention will be described based on the drawings. In the following explanation, when terms indicating a specific direction or position (e.g. "left and right", "up and down", etc.) are used as necessary, the left side is used when facing the forward direction of the vehicle equipped with engine E and manual transmission 1. The left side is simply referred to as the left side, and the right side when facing the forward direction is simply referred to as the right side, and these are used as a reference. These terms are used for convenience of explanation and are not intended to limit the technical scope of the present invention. Note that FIGS. 1 to 9 all show the state when the floor shifter in the vehicle is located at the neutral position.

As shown in FIGS. 1 and 2, the manual transmission 1 according to the embodiment has five forward speeds and one reverse speed, and has a horizontal engine E mounted in the engine room (not shown) of the vehicle. It is attached to engine E so that it is located on the left side of the engine. As shown in FIGS. 3 to 9, the manual transmission 1 includes a transmission gear mechanism 2 that changes the output from the engine E, a switching mechanism 3 that switches the transmission gear mechanism 2, and a transmission gear mechanism 2 and the switching mechanism. 3 and a transmission case 4 that houses the transmission case 3.

The transmission case 4 is divided into two parts, including a deep main body part 5 and a lid part 6 that closes the opening of the main body part 5. Although detailed illustration is omitted, the main body portion 5 opens rightward. The lid portion 6 is open toward both left and right sides. The lid portion 6 is formed with side walls that partition the interior into left and right sides. Therefore, the lid portion 6 is formed with a left opening and a right opening, each having the side wall as a bottom.

A portion of the transmission gear mechanism 2 and the switching mechanism 3 are accommodated within the left opening of the lid portion 6, and most of the transmission gear mechanism 2 and the switching mechanism 3 are accommodated within the main body portion 5. In the embodiment, a differential gear mechanism 7 is also housed within the transmission case 4 (specifically, within the left opening of the lid 6). That is, the transmission case 4 of the embodiment is a so-called transaxle case that houses the transmission gear mechanism 2 and the differential gear mechanism 7 therein. That is, the manual transmission 1 of the embodiment is adopted as a front wheel drive type. The main body part 5 and the lid part 6 (on the left opening side) are bolted together with the transmission gear mechanism 2, the switching mechanism 3, and the differential gear mechanism 7 housed therein. The axes of the speed change gear mechanism 2 and the switching mechanism 3 extend along the opening direction of the main body 5 (the direction in which the main body 5 and the lid 6 are fastened together, in the left-right direction in the embodiment).

A main clutch CL that connects and disconnects power transmission from the engine E to the transmission gear mechanism 2 is housed in the right opening of the lid 6. A speed change input shaft 10 (details will be described later) of the speed change gear mechanism 2 rotatably penetrates a side wall within the lid portion 6. An engine output shaft SH (crankshaft) protruding from the engine E is connected to a speed change input shaft 10 protruding into the right opening via a main clutch CL. The lid portion 6 (right opening side) is bolted to the engine E while housing the main clutch CL.

The power of the engine E is transmitted from the engine output shaft SH to the speed change gear mechanism 2, where the speed is changed as appropriate, and the speed change power is transmitted to left and right front wheels (not shown) via the differential gear mechanism 7.

Next, the speed change gear mechanism 2 of the manual transmission 1 will be explained. As shown in detail in FIG. 3, the transmission gear mechanism 2 housed in the transmission case 4 has a transmission input shaft 10 to which the power of the engine E is input, and a transmission gear mechanism 2 extending parallel to the transmission input shaft 10 and having a differential transmission. A variable speed output shaft 20 that transmits power to the gear mechanism 7 is provided. The speed change input shaft 10 and the speed change output shaft 20 are provided with a plurality of forward speed gear trains G1 to G5 and a reverse gear train GR that transmit power from the speed change input shaft 10 to the speed change output shaft 20. Each of the forward speed gear trains G1 to G5 is composed of two gears that are always in mesh with each other. The reverse gear train GR is composed of three gears that mesh with each other during reverse travel. In the transmission gear mechanism 2 of the embodiment, from the engine E side, a first gear train G1, a reverse gear train GR, a second gear train G2, a third gear train G3, a fourth gear train G4, and a fifth gear train G5. They are lined up in order.

The first speed gear train G1 and the second speed gear train G2 each include a first speed input gear 11 and a second speed input gear 12 fixed to the speed change input shaft 10, and a first speed output gear fitted to the speed change output shaft 20 so as to be relatively rotatable. 21 and a second-speed output gear 22. In addition, the third-speed gear train G3 to the fifth-speed gear train G5 include a third-speed input gear 13 to a fifth-speed input gear 15 that are relatively rotatably fitted to the speed-change input shaft 10, and a third-speed output fixed to the speed-change output shaft 20. It has gears 23 to 5-speed output gear 25. The reverse gear train GR includes a reverse input gear 17 fixed to the transmission input shaft 10, a rearward output gear 27 fitted to the transmission output shaft 20 so as to be non-rotatable and slidable in the axial direction, and the transmission input shaft 10 and the transmission. It is comprised of a reverse idle gear 37 rotatably and slidably fitted in the reverse idle shaft 30 extending in parallel with the output shaft 20 in the axial direction. An output gear 28 that constantly meshes with the ring gear 8 of the differential gear mechanism 7 is fixed to the end (right end) of the variable speed output shaft 20 closer to the engine E.

A low-speed slider 51 is fitted between the first-speed output gear 21 and the second-speed output gear 22 on the speed-change output shaft 20 so as to be non-rotatable relative to each other and slidable in the axial direction. Due to the action of the low speed slider 51, the first speed output gear 21 and the second speed output gear 22 are alternatively connected to the speed change output shaft 20. A medium speed slider 52 is fitted between the third speed input gear 13 and the fourth speed input gear 14 on the speed change input shaft 10 so as to be unable to rotate relative to each other and to be slidable in the axial direction. Due to the action of the medium speed slider 52, the third speed input gear 13 and the fourth speed input gear 14 are selectively connected to the speed change input shaft 10. A high-speed slider 53 is fitted on the transmission input shaft 10 at a location farther from the engine E than the fifth-speed input gear 15 so as to be relatively non-rotatable and slidable in the axial direction. The action of the high-speed slider 53 connects or disconnects the fifth-speed input gear 15 to the speed change input shaft 10 .

By sliding the sliders 51 to 53 along the speed change output shaft 20 or the speed change input shaft 10 based on the forward shift operation of the floor shift (not shown), the sliders 51, 52, 53 are moved based on the speed change output shaft 20 or the speed change input shaft 10. By sliding along the input shaft 10, the relatively rotatable output gears 21, 22 or the input gears 13 to 15 are fixed to the speed change output shaft 20 or the speed change input shaft 10, and the corresponding forward speed gear train G1 is fixed. ~G5 becomes connected to power.

Specifically, when the low speed slider 51 slides toward the engine E side (right side), the first speed output gear 21 is connected to the speed change output shaft 20. As a result, the power of the engine E is transmitted to the differential gear mechanism 7 via the main clutch CL, transmission input shaft 10, first speed input gear 11, first speed output gear 21, transmission output shaft 20, and output gear 28. The front wheels of the machine rotate in first forward speed. When the low-speed slider 51 slides toward the side away from the engine E (to the left), the second-speed output gear 22 is connected to the variable-speed output shaft 20 . As a result, the power of the engine E is transmitted to the differential gear mechanism 7 via the main clutch CL, transmission input shaft 10, second-speed input gear 12, second-speed output gear 22, transmission output shaft 20, and output gear 28. The front wheels of the machine rotate in second forward speed.

When the medium speed slider 52 slides toward the engine E, the third speed input gear 13 is connected to the speed change input shaft 10. As a result, the power of the engine E is transmitted to the differential gear mechanism 7 via the main clutch CL, the transmission input shaft 10, the third-speed input gear 13, the third-speed output gear 23, the transmission output shaft 20, and the output gear 28. The front wheels of the machine rotate in the third forward gear. When the medium speed slider 52 slides away from the engine E, the fourth speed input gear 14 is connected to the speed change input shaft 10. As a result, the power of the engine E is transmitted to the differential gear mechanism 7 via the main clutch CL, transmission input shaft 10, 4-speed input gear 14, 4-speed output gear 24, transmission output shaft 20, and output gear 28. The front wheels of the machine rotate in four forward speeds.

When the high-speed slider 53 slides toward the engine E, the fifth-speed input gear 15 is connected to the speed change input shaft 10. As a result, the power of the engine E is transmitted to the differential gear mechanism 7 via the main clutch CL, transmission input shaft 10, fifth-speed input gear 15, fifth-speed output gear 25, transmission output shaft 20, and output gear 28. The front wheels of the machine rotate in five forward speeds.

The reverse output gear 27 that constitutes the reverse gear train GR is attached to the low-speed slider 51. By sliding the reverse idle gear 37 away from the engine E along the reverse idle shaft 30 based on the reverse shift operation of the floor shift, the reverse idle gear 37 is connected to both the reverse input gear 17 and the reverse output gear 27. mesh together. As a result, the reverse gear train GR enters the power connected state. That is, the power of the engine E is transmitted to the differential gear mechanism 7 via the main clutch CL, the speed change input shaft 10, the reverse input gear 17, the reverse idle gear 37, the reverse output gear 27, the speed change output shaft 20, and the output gear 28. , the left and right front wheels rotate while in reverse.

Next, the switching mechanism 3 of the manual transmission 1 will be explained. As shown in FIGS. 5 to 8, the switching mechanism 3 in the transmission case 4 includes a low-medium speed operation shaft 61 extending parallel to the speed change input shaft 10, the speed change output shaft 20, and the reverse idle shaft 30, and a high speed reverse operation shaft 61 extending parallel to the speed change input shaft 10, the speed change output shaft 20, and the reverse idle shaft 30. A shaft 62 is provided. Both the low-medium speed operation shaft 61 and the high-speed reverse operation shaft 62 are supported in the transmission case 4 so as to be slidable in the axial direction. In the embodiment, one end side (right end side) of the low-medium speed operation shaft 61 and the high-speed reverse operation shaft 62 is supported slidably in the axial direction by the side wall of the lid part 6, and the low-medium speed operation shaft 61 and the high-speed reverse operation shaft 62 are slidably supported in the axial direction. The other end side (left end side) of 62 is supported by the inner wall of main body part 5 so as to be slidable in the axial direction.

A low-speed fork 63 that engages with the low-speed slider 51 and a medium-speed fork 64 that engages with the medium-speed slider 52 are fitted onto the low-medium speed operation shaft 61 so as to be slidable in the axial direction. A high-speed fork 65 that engages with the high-speed slider 53 and a reverse fork 66 that slides the reverse idle gear 37 are fixed to the high-speed reverse operation shaft 62 . Between the low-speed fork 63 and the medium-speed fork 64 on the low-medium speed operation shaft 61, a selection arm 67 for selectively selecting the low-speed fork 63, the medium-speed fork 64, or the reverse fork 66, and a selection arm 67 are provided. A guide lever 68 that is rotated about a low-medium speed operating shaft 61 is attached.

The selection arm 67 is fixed to the low-medium speed operation shaft 61 and is rotatable together with the low-medium speed operation shaft 61. The guide lever 68 is fitted so as to be slidable relative to the low-medium speed operation shaft 61 and rotatable around the low-medium speed operation shaft 61 . The guide lever 68 cannot slide along the low-medium speed operation shaft 61. The low-speed fork 63, the medium-speed fork 64, and the reverse fork 66 are each provided with protruding engagement pieces 69 to 71 that can be engaged with the distal end side of the selection arm 67.

Due to the rotation of the guide lever 68 around the low-medium speed operation shaft 61, the selection arm 67 also rotates around the low-medium speed operation shaft 61, and the low-speed engagement piece 69 of the low-speed fork 63 and the medium-speed fork 64 are rotated. It engages with either the medium-speed engagement piece 70 or the reverse engagement piece 71 of the reverse fork 66 . As a result, the low-speed fork 63, the medium-speed fork 64, and the reverse fork 66 are selectively connected to the selection arm 67 and, in turn, to the low-medium speed operating shaft 61. In the embodiment, when the selection arm 67 selectively selects the low-speed fork 63, the medium-speed fork 64, or the reverse fork 66, the action of the guide lever 68 causes the unselected fork to move to the low-medium-speed operating shaft 61 or the high-speed fork. It is configured to prevent sliding movement along the reverse operation shaft 62.

A shift sleeve 72 with a locking groove 73 is fixed on the low-medium speed operating shaft 61 at a location closer to the engine E than the low-speed fork 63 is. The shift sleeve 72 and, in turn, the low-medium speed operating shaft 61 are configured to slide in the axial direction in conjunction with the rotation of the shift arm 81, which will be described later.

When the guide lever 68 is rotated around the low-medium speed operation shaft 61 based on the selection operation of the floor shift, the selection arm 67 is rotated around the low-medium speed operation shaft 61 in conjunction with the guide lever 68, and the low-speed fork is rotated. The selection arm 67 selectively engages with the low-speed engagement piece 69 of 63, the medium-speed engagement piece 70 of the medium-speed fork 64, or the reverse engagement piece 71 of the reverse fork 66. As a result, the low-speed fork 63, the medium-speed fork 64, and the reverse fork 66 are selectively connected to the selection arm 67 and, in turn, to the low-medium speed operating shaft 61.

Then, when the shift sleeve 72 and thus the low-medium speed operating shaft 61 are slid in the axial direction based on the forward shift operation of the floor shift, the sliders 51 to 53 corresponding to the selected fork 63, 64, 66 are moved to the shift output shaft 20. Alternatively, it slides along the speed change input shaft 10, and as described above, the corresponding forward speed gear trains G1 to G5 are brought into the power connected state.

When the floor shifter is operated to shift to the first speed, the shift sleeve 72 and the low-medium speed operating shaft 61 slide toward the engine E side (right side), and accordingly the low speed fork 63 and the low speed slider 51 slide toward the engine E side. . As a result, the first speed output gear 21 is connected to the variable speed output shaft 20, and as described above, the left and right front wheels are rotationally driven in the forward first speed state.

When the floor shifter is operated to shift to second speed, the shift sleeve 72 and the low-medium speed operating shaft 61 slide to the side away from the engine E (left side), and accordingly the low speed fork 63 and the low speed slider 51 move away from the engine E. Slide to move. As a result, the second speed output gear 22 is connected to the variable speed output shaft 20, and as described above, the left and right front wheels are rotationally driven in the forward second speed state.

When the floor shifter is operated to shift to the third speed, the shift sleeve 72 and thus the low-medium speed operation shaft 61 slide toward the engine E side, and accordingly the medium speed fork 64 and the medium speed slider 52 slide toward the engine E side. As a result, the third speed input gear 13 is connected to the speed change input shaft 10, and as described above, the left and right front wheels are rotationally driven in the forward third speed state.

When the floor shifter is operated to shift to the fourth speed, the shift sleeve 72 and the low-medium speed operating shaft 61 slide away from the engine E, and accordingly, the medium-speed fork 64 and the medium-speed slider 52 move away from the engine E. Slide to move. As a result, the four-speed input gear 14 is connected to the speed change input shaft 10, and as described above, the left and right front wheels are rotationally driven in the forward four-speed state.

When the floor shifter is operated to shift to the fifth speed, the shift sleeve 72 and the low-medium speed operating shaft 61 slide toward the engine E side, and accordingly, the high-speed slider 53 connected to the reverse fork 66 via the high-speed reverse operating shaft 62 moves. Slide to the engine E side. As a result, the 5th speed input gear 15 is connected to the speed change input shaft 10, and as described above, the left and right front wheels are rotationally driven in the 5th forward speed state.

In this case, the reverse idle gear 37 is interlocked and connected to the reverse fork 66 via the flexibility arm 74. Although details are omitted, the flexibility arm 74 moves the reverse idle gear 37 along the reverse idle shaft 30 to the side away from the engine E only when the reverse fork 66 and the high-speed reverse operation shaft 62 slide toward the side away from the engine E. It is configured to slide. Therefore, in a state where the reverse fork 66 and the high-speed reverse operation shaft 62 slide toward the engine E, the backward idle gear 37 does not slide due to the action of the flexibility arm 74.

When the floor shifter is operated backward, the shift sleeve 72 and thus the low-medium speed operating shaft 61 slide away from the engine E, and the reverse fork 66 slides away from the engine E accordingly. As a result, the reverse idle gear 37 slides away from the engine E along the reverse idle shaft 30 via the flexibility arm 74, and the reverse idle gear 37 is connected to both the reverse input gear 17 and the reverse power gear 27. As mentioned above, the left and right front wheels are engaged and rotated while moving in reverse.

Now, the transmission case 4 includes a shift shaft 76 for performing a shift operation by sliding the low-medium speed operation shaft 61, and a select shaft 75 for performing a selection operation for rotating the low-medium speed operation shaft 61. In the embodiment, the shift shaft 76 and the select shaft 75 are rotatably supported on the upper surface of the transmission case 4 (not supported pivotably) in a vertical posture extending in a direction intersecting the low-medium speed operation shaft 61. ). In this case, the select shaft 75 is rotatably supported on the upper surface of the main body portion 5, while the shift shaft 76 is rotatably supported on the upper surface of the lid portion 6 on the left opening side.

An outside select lever 77 for rotating the select shaft 75 is fixed to the protruding end side of the select shaft 75 outside the main body 5 . An outside shift lever 78 for rotating the shift shaft 76 is fixed to the protruding end side of the shift shaft 76 outside the lid 6 . The select outer lever 77 and the shift outer lever 78 are operatively connected to the floor shift via a link mechanism (not shown) including a link mechanism and a wire. By operating the floor shift in the select direction, the select shaft 75 is rotated via the link mechanism and the outside select lever 77, and by operating the floor shift in the shift direction, the select shaft 75 is rotated via the link mechanism and the outside shift lever 78. The shift shaft 76 is configured to rotate.

The shift shaft 76 is configured to engage the switching mechanism 3 from a direction intersecting the low-medium speed operation shaft 61. That is, a shift arm 81 that engages with the locking groove 73 of the shift sleeve 72 is attached to the protruding end side of the shift shaft 76 inside the lid 6 . The shift arm 81 is fitted into the locking groove 73 of the shift sleeve 72 from above. By rotating the shift arm 81 around the shift shaft 76, the shift sleeve 72 and, in turn, the low-medium speed operation shaft 61 are configured to slide in the axial direction.

The select shaft 75 is configured to engage the switching mechanism 3 from the axial direction of the low-medium speed operation shaft 61. That is, the guide lever 68 is formed with a U-shaped locking recess 79 that is open in the upper direction and in the axial direction of the low-medium speed operation shaft 61, while the protruding end side of the select shaft 75 inside the main body 5 is formed. A select arm 80 that engages with the locking recess 79 of the guide lever 68 is attached to the guide lever 68 . The select arm 80 moves the guide lever 68 in a posture along the axial direction of the low-medium speed operation shaft 61, that is, the opening direction of the main body 5 (the direction in which the main body 5 and the lid 6 are fastened, the left-right direction in the embodiment). It is inserted into the locking recess 79. The rotation of the selection arm 80 about the selection shaft 75 causes the guide lever 68 and, in turn, the selection arm 67 to rotate about the low-medium speed operation shaft 61.

Although details are omitted, a shift detent mechanism is provided in the left opening of the lid 6 to maintain the shift shaft 76 at a neutral position in the shift direction. Even during assembly work of the manual transmission 1, the shift shaft 76 is held at a neutral position in the shift direction, and the shift arm 81 and the locking groove 73 of the shift sleeve 72 are configured to smoothly engage. .

Furthermore, a select detent mechanism is provided within the main body portion 5 to maintain the select shaft 75 in a completely neutral position. Even during assembly work of the manual transmission 1, the select shaft 75 is held at a completely neutral position, and the select arm 80 and the locking recess 79 of the guide lever 68 are configured to smoothly engage.

Next, the lubrication structure of the manual transmission 1 will be described with reference to FIGS. 10 to 20. As shown by the symbol LO in FIG. 9, oil (lubricating oil) is stored at the bottom of the transmission case 4. A gutter-shaped oil receiver 100 is arranged at the upper part of the transmission case 4. The oil receiver 100 temporarily stores the oil in the transmission case 4 that has been scraped up by the rotation of the ring gear 8 and the gears such as the first-speed output gear 21 and the rearward output gear 27, and stores the oil in the transmission case 4. This is a member for guiding to lubricated parts such as the left end (one end) of the gear shift output shaft 20 and the output gears 22, 23, 24, 25, 27 on the speed change output shaft 20. Details of the oil receiver 100 will be described later.

As shown in FIG. 4 and the like, the transmission input shaft 10 includes an input shaft oil passage 10a extending rightward from the left end, and a third to fifth gear oil passage 10a extending radially from the input shaft oil passage 10a. Lubrication holes 10b to 10d are provided on the sliding surfaces of the speed input gears 13 to 15. A funnel-shaped oil guide 200 is provided to the left of the left end of the transmission input shaft 10, which is attached to the left end surface of the transmission case 4 and inserted into the input shaft oil passage 10a. Note that both left and right end portions of the transmission input shaft 10 are rotatably supported by the transmission case 4 via bearings 31 and 32.

The speed change output shaft 20 also includes an oil passage 20a in the output shaft extending leftward from the right end (other end), and an oil passage 20a in the output shaft extending in the radial direction from the oil passage 20a in the output shaft. Lubricating holes 20b and 20c are provided in the sliding surfaces of the output gears 21 and 22, respectively. A funnel-shaped oil guide 300 is provided to the right of the right end of the transmission output shaft 20, which is attached to the right end surface (lid 6) of the transmission case 4 and inserted into the output shaft internal oil passage 20a. Note that both left and right end portions of the transmission output shaft 20 are rotatably supported by the transmission case 4 via bearings 33 and 34.

The differential gear mechanism 7 includes a differential gear 56 (pinion gear and side gear) housed in a differential case 55 that rotates integrally with the ring gear 8. The left and right boss portions of the differential case 55 are rotatably supported by the transmission case 4 via a left bearing 57 and a right bearing 58. A left axle 35 and a right axle 36 are connected to the left and right side gears of the differential gear 56 so as to be non-rotatable relative to each other. The left and right axles 35 and 36 protrude left and right from the transmission case 4, and the gaps between the left and right axles 35 and 36 and the transmission case 4 are sealed by a left oil seal 59 and a right oil seal 60.

Next, an overview of the lubrication structure of the manual transmission 1 will be explained. As shown in FIGS. 9 to 16, the lubrication structure of this embodiment uses a bucket-shaped oil receiver 100 to capture oil scooped up by the ring gear 8 of the differential gear mechanism 7 provided inside the transmission case 4. It is configured to guide the gears toward the left end (one end) of the speed change input shaft 10 as a rotating shaft. 10, FIG. 11, FIG. 13, and FIG. 16, solid line arrows indicate movement of oil scooped up by gears or oil flowing out from oil receiver 100, and dashed line arrows indicate movement of oil on oil receiver 100. .

The oil receiver 100 is configured to separate a first oil passage 110 serving as a main passage that guides the oil scooped up by the ring gear 8 toward the left end of the transmission input shaft 10 and oil overflowing from a midway part of the first oil passage 110. A right seal passage 120 that guides toward the right oil seal 60 provided on the side (right side) of the differential gear 56 of the dynamic gear mechanism 7, and a right seal passage that supplies oil to the differential gear 56. A differential gear supply port 130 is provided in the middle of the differential gear 120. In this embodiment, oil overflowing from the middle of the first oil passage 110 is introduced into the sealing passage 120 via the storage section 140.

As described above, according to the lubrication structure of the transmission 1, a part of the oil scooped up by the ring gear 8 of the differential gear mechanism 7 is transferred to the right oil through the first oil passage 110 and the right seal passage 120 of the oil receiver 100. It can be supplied to the seal 60 and also to the differential gear 56 from the differential gear supply port 130. Thereby, insufficient lubrication of the differential gear 56 and the right oil seal 60 can be prevented.

Note that the differential gear supply port 130 is not limited to the opening provided at the bottom of the right seal passage 120, but may be formed by an opening or a notch provided in the side wall 121 of the right seal passage 120. . Further, the rotating shaft through which the oil scraped up by the ring gear 8 is supplied to one end via the main passage is not limited to the speed change input shaft 10, but may be the speed change output shaft 20, or may be the speed change input shaft 10 and the speed change input shaft 10. Both output shafts 20 may be used.

As shown in FIGS. 15 and 16, in the lubrication structure of this embodiment, the oil receiver 100 includes a partition wall 131 around the differential gear supply port 130 that is lower than the side wall 121 of the right seal passage 120. ing.

When there is a large amount of oil flowing through the right seal passage 120 overflowing from the first oil passage 110 of the oil receiver 100 and flowing into the right seal passage 120, the oil flowing through the right seal passage 120 is supplied to the right oil seal 60 and used for the differential gear. It is also supplied to the differential gear 56 over the partition wall 131 around the supply port 130 . On the other hand, when the amount of oil flowing into the right seal passage 120 is small, the oil flowing through the right seal passage 120 is exclusively supplied to the oil seal 60 without exceeding the partition wall 131 around the differential gear supply port 130. . As a result, when the amount of oil on the oil receiver 100 increases and the oil level in the transmission case 4 decreases, the differential gear supply port By supplying oil from 130 to the differential gear 56, insufficient lubrication of the differential gear 56 can be prevented.

As shown in FIGS. 10, 14 to 16, etc., the oil receiver 100 includes a storage section 140 that stores oil overflowing from the first oil passage 110, and the oil overflowing from the storage section 140 is placed in the right seal passage 120. It is configured to be supplied with oil.

The lubrication structure of this embodiment stores the oil overflowing from the first oil passage 110 in the storage part 140, thereby lowering the oil level in the transmission case 4 and resisting oil stirring in the differential gear mechanism 7, etc. In addition, when oil is stored on the oil receiver 100 to the extent that it overflows from the storage section 140, the oil flows from the storage section 140 into the right seal passage 120 to lubricate the oil seal 60 and the differential gear 56. Can prevent shortages.

Note that the oil overflowing from the first oil passage 110 may be configured to directly flow into the right seal passage 120 without passing through the storage section 140, or may be configured to flow directly into the right seal passage 120 through another passage. It may be configured so that it flows in.

As shown in FIG. 10, FIG. 13 to FIG. 15, FIG. The oil receiver 100 collects the oil in a tub-shaped oil receiver 100 and guides it toward a lubricated part such as one end of the transmission input shaft 10. a receiver main body 101 having passages 150, 160, 170, 180, etc. that guide the oil toward the receiver body 101; and a capture member 102 that is non-removably attached to the upper surface of the receiver main body 101 and has an inclined capture surface portion 102a that guides the captured oil to the passage 150. It is equipped with

In this way, by configuring the oil receiver 100 with the receiver body 101 and the capture member 102 that is separate from the receiver body 101, the gear can be adjusted by setting the inclined capture surface portion 102a of the capture member 102 to a desired inclination angle. It can actively and reliably collect the oil that is scraped up. Furthermore, each of the receiver body and the capture member can be formed by injection molding at low cost without using a slide mold.

Next, the configuration of the oil receiver 100 will be explained. The oil receiver 100 is made of synthetic resin, and includes the receiver body 101 and the capture member 102 as described above.

As shown in FIGS. 14, 15, etc., the receiver main body 101 includes a first oil passage 110 (main passage) that extends diagonally forward to the left from above the ring gear 8 and extends toward the left inner wall of the transmission case 4; The oil supply end 180 is provided continuously with the downstream end of the first oil passage 110. The oil scraped up by the rotation of the ring gear 8 is collected in a first oil receiver 111 provided at the right end of the first oil passage 110.

The bottom surface of the first oil passage 110 is slightly inclined downwardly from the first oil receiver 111 toward the oil supply end 180, so that the oil collected in the first oil receiver 111 is transferred to the oil supply end. It is configured to flow toward section 180.

A storage section 140 that stores oil overflowing from the first oil passage 110 is provided on the front side of the right end portion of the first oil passage 110 . The first oil passage 110 and the storage section 140 are separated by a side wall 112. An oil return hole 142 is provided at the bottom of the storage section 140, and the oil accumulated in the storage section 140 is configured to be gradually returned below the oil receiver 100.

A right seal passage 120 is provided along the right side wall from the front side wall of the first oil receiving portion 111 . As shown in FIG. 10 and the like, the right seal passage 120 curves from the right rear corner of the storage section 140 to the rear side along the first oil receiving section 111 and further extends to the right side in a plan view. It passes above the differential gear 56 of the moving gear mechanism 7 and extends above the right bearing 58 .

As shown in FIGS. 15 and 16, among the side walls surrounding the storage section 140, the side wall 141 between the right seal passage 120 and the right seal passage 120 is formed to have a lower height than the other side wall portions. When a certain amount or more of oil accumulates in 140, the oil is configured to flow preferentially to the right seal passage 120.

A side wall 113 that partitions the front part of the first oil receiving part 111 and the right seal passage 120 is formed higher than the side wall 112 of the first oil passage 110, and the oil scooped up by the ring gear 8 is transferred to the first oil receiving part. It is configured to efficiently collect the oil in the portion 111 and to prevent oil scraped up by the ring gear 8 and oil overflowing from the first oil passage 110 from flowing directly into the right seal passage 120.

As shown in FIGS. 10 and 11, the oil flowing into the right seal passage 120 from the storage section 140 flows through a notch-shaped right seal supply port 122 provided in the side wall 121 at the right end of the right seal passage 120. The oil is supplied to the right bearing 58 and the right oil seal 60 through the inner wall 6a (see FIG. 11) of the transmission case 4 (lid 6).

A differential gear supply port 130 that opens in the vertical direction is provided in the middle of the bottom of the right seal passage 120. The differential gear supply port 130 is located above the differential gear 56 of the differential gear mechanism 7. A partition wall 131 that is lower than the side wall 121 of the right seal passage 120 is provided around the differential gear supply port 130 . As a result, when the amount of oil flowing into the right seal passage 120 is small, the oil flowing through the right seal passage 120 is exclusively supplied to the oil seal 60 without exceeding the partition wall 131 around the differential gear supply port 130. On the other hand, when the amount of oil flowing into the right seal passage 120 is large, it is supplied to the right oil seal 60 and also to the differential gear 56 over the partition wall 131 around the differential gear supply port 130.

As shown in FIGS. 14 to 16, a box-shaped left seal supply into which oil overflowing from the first oil passage 110 flows into a position on the left side of the first oil receiving portion 111 on the rear side of the first oil passage 110. A section 145 is provided. An oil drip hole 145a is provided at the bottom of the left seal supply section 145. As shown in FIGS. 10 and 11, the oil flowing out from the oil drip hole 145a is configured to be supplied to the left bearing 57 and the left oil seal 59 through the inner wall 5a of the main body 5 of the transmission case 4. ing.

As shown in FIGS. 10, 14, etc., a second oil passage 190 is provided in front of the storage section 140 and extends leftward along the storage section 140. The right end portion of the second oil passage 190 constitutes a second oil receiving portion 191 that collects oil scooped up by the rotation of the first speed output gear 21. The side wall 192 between the right end portion of the second oil passage 190 and the storage portion 140 is formed high so that its upper end portion is located near the upper surface of the inner wall of the transmission case 4, and is connected to the first speed output gear 21. The second oil receiving portion 191 is configured to efficiently collect the oil scooped up by the second oil receiving portion 191.

As shown in FIGS. 10, 11, 14, 15, etc., a box-shaped reverse supply section 193 and a second and third speed supply section 194 are connected in the middle of the second oil passage 190. ing. The oil drip hole 193a provided at the bottom of the reverse supply section 193 is located above the reverse output gear 27, and the oil drip holes 194a and 194b provided at the bottom of the second and third speed supply sections 194 are located above the second speed output gear 22. It is located at the top and third output gear 23.

The partition wall between the second oil passage 190 and the supply parts 193, 194 is formed with a lower dimension than the side wall of the second oil passage 190, and the partition wall between the second oil passage 190 and the supply parts 193, 194 is formed with a lower dimension than the side wall of the second oil passage 190. At times, oil flows into the supply portions 193, 194 from the second oil passage 190, and the oil drips from the oil drip holes 193a, 194a, 194b to the output gears 27, 22, 23.

As shown in FIGS. 10 to 15 and the like, a third oil passage 150 is provided in front of the second oil passage 190 with a space therebetween. As shown in FIG. 12 and the like, the third oil passage 150 extends in the left-right direction above the output gears 22, 23, and 27, and is provided at a higher position than the second oil passage 190. A right-side portion of the third oil passage 150 constitutes a third oil receiving portion 151 that collects oil scooped up by the second-speed output gear 22 and the backward output gear 27.

A capturing member 102 that is separate from the receiver main body 101 is connected to the third oil passage 150 so as to cover the upper part of the third oil receiving portion 151 . Details of the capture member 102 will be described later.

The middle part of the second oil passage 190 and the middle part of the third oil passage 150 are connected by a U-shaped connecting part 199 that opens upward. The receiver main body 101 is provided with an opening 198 surrounded by a second oil passage 190, a third oil passage 150, a connecting portion 199, and an intermediate oil passage 160, which will be described later. As shown in FIGS. 6, 7, 12, etc., the above-mentioned select arm 80 is arranged in the opening 198 so as to be rotatable around the select shaft 75.

The left end (downstream end in the oil flow direction) of the third oil passage 150 is connected to an intermediate oil passage 160 having a concave bottom. The intermediate oil passage 160 includes, in order from the front side, a front inclined part 161 with a high front and low rear posture extending leftward from the left end of the third oil passage 150 to near the oil supply end 180, and a part near the right end of the front inclined part 161. It has a central inclined part 162 with a high front and low rear posture adjacent to the center inclined part 162, and a rear inclined part 163 with a low front and high rear posture adjacent to the central inclined part 162. The rear inclined portion 163 is adjacent to the left end portion of the second oil passage 190, and a partition wall 164 is provided between the rear inclined portion 163 and the second oil passage 190. As shown in FIG. 10, the front inclined portion 161 of the intermediate oil passage 160 constitutes an oil receiving portion that collects oil scooped up by the fourth-speed output gear 24 and the fifth-speed output gear 25.

The left end portions of the inclined portions 162 and 163 forming the V-shaped bottom of the intermediate oil passage 160 merge with the left end portion of the second oil passage 190, and are connected to a deeper substantially V-shaped merging oil passage 170. . The merging oil passage 170 is inclined at the same inclination angle as the rear inclined portion 163 of the intermediate oil passage 160 and the left end portion of the second oil passage 190, with a lower front and a higher rear position. The merging oil passage 170 and the central inclined part 162 of the intermediate oil passage 160 are connected to each other by an inclined part 171 having a lower left-right position and a higher right-hand position. A left end portion of the confluence oil passage 170 is connected to an oil supply end portion 180.

A box-shaped fourth-speed and fifth-speed supply section 165 is connected to the middle of the front inclined portion 161 of the intermediate oil passage 160 . Oil drip holes 165a and 165b provided at the bottom of the fourth and fifth speed supply portions 165 are located above the fourth speed output gear 24 and the fifth speed output gear 25.

A partition wall 166 is provided between the front inclined portion 161 and the fourth and fifth speed supply portions 165, and a partition wall 172 is provided between the merging oil passage 170 and the fourth and fifth speed supply portions 165. There is. When the amount of oil accumulated in the merging oil passage 170 exceeds a certain amount, oil flows into the fourth and fifth speed supply portions 165 through the partition wall 172 and is supplied to the output gears from the oil drip holes 165a and 165b. The structure is such that oil drips into ports 24 and 25.

The oil supply end portion 180 is formed in a substantially V-shaped groove shape, and is connected to the left end portions (downstream end portions of oil flow) of the first oil passage 110 and the merging oil passage 170. The left front end portion of the oil supply end portion 180 constitutes an input shaft center supply port 181 formed in a nozzle shape with a low front and high posture.

As shown in FIGS. 12 and 20, the left inner wall 5b of the main body 5 of the transmission case 4 has a substantially U-shaped opening facing right into which the left end (oil supply end 180) of the receiver main body 101 is inserted. A receiver support groove 5c is provided. The receiver support groove 5c is provided in a posture that is low in the front and high in the rear, and is connected to a cylindrical bearing support portion 5d that accommodates a bearing 31 that supports the left end portion of the speed change input shaft 10.

Although the details will be described later, an oil guide holding part 5e consisting of a stepped part that supports the oil guide 200 is provided at the bottom (left side part) of the bearing support part 5d, and an oil guide holding part 5e is provided between the oil guide 200 and the inner wall of the transmission case 4. An oil storage section 5f capable of storing oil is provided. The oil flowing out from the input shaft center supply port 181 of the oil supply end portion 180 is configured to be supplied to the oil storage portion 5f.

As shown in FIGS. 5 to 7, the oil receiver 100 is supported by the main body portion 5 of the transmission case 4. As shown in FIGS. More specifically, as shown in FIG. 12, FIG. 14, FIG. A leftward L-shaped mounting protrusion 105 that is press-fitted from the right side into a mounting hole 5g (see FIG. 14) provided in the main body part 5 and protrudes from the rear side wall 151a of the third oil passage 150 is attached to the inner wall boss of the main body part 5. The oil supply end 180 is inserted from the right side into the mounting hole 5h (see FIGS. 12 and 14) provided in the part (boss part having a vertical through hole through which the select shaft 75 is inserted), and the oil supply end 180 is inserted into the left side inner wall of the main body part 5. It is inserted into the receiver support groove 5c provided in the receiver support groove 5b.

Next, the capturing member 102 of the oil receiver 100 will be explained. As shown in FIGS. 10 to 15 and 17, the rear end of the capture member 102 is connected to the rear side wall 151a of the third oil receiver 151 of the receiver main body 101, and It is also provided so as to protrude forward. The capturing member 102 includes an inclined capturing surface portion 102a on the rear side in a low forward and rearward posture, and an oil blocking portion 102b on the front side in a low and posteriorly high posture that is continuous with the front end of the inclined capturing surface portion 102a, and faces upward in side view. It has a convex, approximately F-shape.

As shown in FIGS. 10 and 13, the inclined capturing surface portion 102a of the capturing member 102 covers the upper part of the third oil receiving part 151, and also extends above the output gears 22, 27 on the front side of the third oil receiving part 151. It is located. The oil scooped up by the output gears 22 and 27 is captured on the lower surface of the inclined capturing surface section 102a, and is collected in the third oil receiving section 151 along the lower surface of the inclined capturing surface section 102a. Thereby, the oil scraped up by the output gears 22, 27, etc. can be actively and reliably collected.

The oil blocking portion 102b of the capturing member 102 extends obliquely forward and downward from the front portion of the inclined capturing surface portion 102a. The right edge of the oil blocking portion 102b protrudes to the right than the right edge of the inclined capture surface portion 102a, and is disposed near a breather chamber cover member 401, which will be described later.

The attachment structure of the capture member 102 to the receiver main body 101 will be described with reference to FIG. 17 and the like. Engagement portions 102c that protrude rearward at three left and right locations on the rear of the capture member 102 are inserted into insertion holes 151c at three left and right locations provided in the rear side wall 151a of the third oil receiving portion 151 in the receiver body 101 on the diagonally upper front side. Insert from.

The front part of the capture member 102 is rotated downward, and an engagement hole 102d that opens in the vertical direction provided in the engagement portion 102c of the capture member 102 is provided in the upper part of the insertion hole 151c of the receiver main body 101 for a downwardly convex engagement. It engages with the protrusion 151d. As a result, movement of the capturing member 102 in the vertical and horizontal directions with respect to the receiver main body 101 is restricted.

Further, an engagement notch 102e is provided on the right side of the capture member 102 (the right side of the inclined capture surface 102a), and an engagement claw 151e is provided on the right end of the front side wall 151b of the third oil receiving portion 151 and is provided to protrude upward. By inserting the engagement claw 151e from below into the upper surface of the inclined capture surface portion 102a while elastically deforming the distal end portion of the engagement claw 151e backward, the forward claw portion of the engagement claw 151e connects to the inclined capture surface portion in front of the engagement notch portion 102e. 102a. As a result, upward rotation of the front portion of the capturing member 102 attached to the receiver main body 101 is prohibited.

Then, the lower surface of the right edge of the inclined capture surface section 102a contacts the support stepped section 151f provided on the left side of the engagement claw 151e, while the third oil passage 150 is erected so as to face the left edge of the inclined capture surface section 102a. The upper end of the provided support protrusion 151g comes into contact with the left edge of the inclined capture surface portion 102a, thereby restricting downward rotation of the front portion of the capture member 102. Further, since the downward rib portion 102f extending in the left-right direction and hanging down from the lower surface of the rear edge of the capturing member 102 is arranged adjacent to the front face of the rear side wall 151a of the third oil receiving portion 151, the front portion of the capturing member 102 It is configured such that downward rotation of the is restricted.

In this way, the capturing member 102 can be attached to the receiver main body 101 without using any tools and through a simple process. Note that by displacing the tip of the engagement claw 151e backwards and positioning the forward claw part of the engagement claw 151e above the engagement notch 102e, the front part of the capture member 102 is rotated upward. , it is also possible to remove the capture member 102 from the receiver body 101.

As shown in FIGS. 10, 13, 18, etc., the right edge of the oil blocking portion 102b, which is provided at the front of the capturing member 102 and has a low front and high posture, is on the right side of the right edge of the inclined capturing surface 102a. The breather chamber cover member 401 is disposed protruding from the breather chamber cover member 401 .

The manual transmission 1 is provided with a breather mechanism 400 that communicates between the inside and outside of the transmission case 4. The breather mechanism 400 includes a concave breather chamber 6b provided on the inner wall surface 6i of the lid portion 6 of the transmission case 4, and a breather chamber cover attached to a convex rib portion 6c provided on the inner wall surface 6i around the breather chamber 6b. It includes a member 401, a vent hole 6d that communicates the breather chamber 6b with the outside of the transmission case 4, and a breather plug 402 attached to the vent hole 6d from the outside of the transmission case 4.

The breather chamber 6b is provided at an upper front portion of the left-facing inner wall surface 6i of the lid portion 6, and is arranged above the support hole 6g that supports the high-speed reverse operation shaft 62. The rib portion 6c surrounds the opening edge of the breather chamber 6b, and has a ventilation portion 6e that opens a part of the opening edge (lower front portion) of the breather chamber 6b. Here, the rib part 6c on the lower side of the breather chamber 6b is a boss part provided around the support hole 6g that slidably supports the right end part of the high-speed reverse operation shaft 62, and the breather chamber cover member 401 is connected to the lid part 6. It is made up of a boss part provided around a screw hole 6h into which a bolt 403 for attaching to the main body is screwed.

The ventilation hole 6d is provided so as to penetrate upward from the upper surface of the breather chamber 6b to the upper surface of the transmission case 4 (lid portion 6). The breather plug 402 is configured to be able to adjust the internal pressure of the transmission case 4, and is attached to the upper surface of the transmission case 4 so as to close the upper part of the ventilation hole 6d.

The breather chamber cover member 401 is made of metal and has a flat plate portion that covers the breather chamber 6b and the ventilation portion 6e from the left side. is fixed to the inner wall surface 6i of. Further, the inner wall surface 6i of the lid portion 6 is provided with a downward rib portion 6f extending downward from the boss portion around the screw hole 6h into which the bolt 403 is screwed, so that the right side surface of the breather chamber cover member 401 faces downward. By coming into contact with the rib portion 6f, the oil scraped up by the output gears 21, 27, etc. is prevented from reaching the ventilation portion 6e. The breather chamber cover member 401 also serves as a member that rotatably supports the flexibility arm 74 (see FIG. 6) that slides the reverse idle gear 37.

The breather chamber cover member 401 is provided with a through hole 401a that penetrates in the left-right direction at a position facing the breather chamber 6b. The breather chamber 6b communicates with the inside of the transmission case 4 at two locations: a through hole 401a and a ventilation portion 6e. By providing the through hole 401a with a different oil entry environment for the ventilation part 6e, the internal pressure of the transmission case 4 increases due to the temperature rise of the manual transmission 1, and the air inside the transmission case 4 is discharged from the breather plug 402 to the outside. When the oil is discharged, it is possible to suppress the phenomenon in which the oil is sucked up from the ventilation portion 6e, and in turn, it is possible to prevent the oil from being ejected from the breather plug 402.

As shown in FIGS. 9, 10, 13, and 18, the right end portion of the capture member 102 (oil blocking portion 102b) of the oil receiver 100 is disposed close to the breather chamber cover member 401, and is located below the through hole 401a. It is provided so that it is located. The oil blocking portion 102b prevents oil scraped up by the output gears 21, 27, etc. from directly heading toward the through hole 401a. This prevents oil scraped up by the output gears 21, 27, etc. from directly entering the through hole 401a, or a large amount of oil adhering to the surface of the breather chamber cover member 401 around the through hole 401a, blocking the through hole 401a. can be prevented. In addition, oil can be prevented from entering the breather chamber 6b through the through hole 401a, and oil can be prevented from ejecting from the breather plug 402.

Next, an overview of the lubrication structure using the oil guide 200 will be described with reference to FIGS. 11 to 12, 19, 20, and the like.

The lubrication structure of this embodiment guides oil through a funnel-shaped oil guide 200 to an input shaft oil passage 10a that opens at the end face of a speed change input shaft 10 as a rotating shaft provided in a transmission case 4. The oil guide 200 includes a base 201 whose peripheral edge is held by the oil guide holding portion 5e of the transmission case 4, and a cylindrical portion 202 that protrudes from one surface 201a of the base 201 and is inserted into the input shaft oil passage 10a. and a claw portion 203 protruding from the peripheral edge of the base portion 201. The oil guide holding portion 5e includes an engagement groove 5j in which a claw portion 203 engages with an inner wall surface 5i surrounding the peripheral edge of the base 201 of the oil guide 200.

According to this aspect, the process of attaching the oil guide 200 to the transmission case 4 is not performed by welding or press-fitting, but by fitting the oil guide 200 into the oil guide holding part 5e and connecting the claw part 203 with the engagement groove 5j. The oil guide 200 can be attached to the transmission case 4 by a simple operation of engaging the two. Thereby, the time required to attach the oil guide 200 can be shortened and productivity can be improved, and since a welding machine or a press machine is not required for attaching the oil guide 200, manufacturing costs can be reduced.

As shown in FIGS. 19 and 20, the oil guide 200 is made of resin and includes an opening 204 provided on the periphery of the base 201 at a position closer to the center of the base 201 than the claw 203. The claw portion 203 is configured to be able to be displaced toward the center of the base portion 201 by bending and deforming the portion of the base portion 201 between the opening portion 204 and the opening portion 204 .

According to this aspect, by making the oil guide 200 made of resin, it is possible to realize weight reduction, and by making the oil guide 200 an injection molded product, sheet metal drawing is not required, so that productivity can be improved.

As shown in FIGS. 19 and 20, the oil guide holding portion 5e is attached to the back surface of the base 201 of the oil guide 200 opposite to the one surface 201a (in this case, a rib back surface 201d of a rib portion 201c provided at the periphery of the back surface 201b). ) is in contact with the step portion 5k, and the claw portion 203 of the oil guide 200 and the engagement groove 5j of the oil guide holding portion 5e are at a position where they engage with the rib back surface 201d of the base 201 in contact with the step portion 5k. It is set in.

According to this aspect, when attaching the oil guide 200 to the oil guide holding part 5e, the oil guide 200 can be attached by a simple operation of pushing the oil guide 200 until the rib back surface 201d of the oil guide 200 comes into contact with the stepped part 5k. The oil guide 200 can be easily attached to a predetermined position, and productivity can be improved by ensuring the installation of the oil guide 200 and shortening the installation time.

Note that the base portion 201 of the oil guide 200 may have a configuration in which the rib portion 201c is not formed on the back surface 201b. In this case, the claw portion 203 is provided on the outer circumferential surface of the base portion 201 so as to protrude outward in the circumferential direction. Further, in this embodiment, three claw portions 203 are provided as described later, but the number of claw portions 203 is not particularly limited.

As shown in FIGS. 19 and 20, the engagement groove 5j of the oil guide holding portion 5e is an undercut groove provided in the inner wall surface 5i at the corner of the stepped portion 5k.

According to this aspect, since the undercut groove formed by the undercut processing performed on the corner of the recess is utilized, the oil guide 200 can be attached to the oil guide holding portion while suppressing an increase in manufacturing costs. It can be maintained at 5e.

The engagement groove 5j of the oil guide holding portion 5e is not limited to being an undercut groove, and may be formed, for example, by a groove provided in the middle of the inner wall surface 5i in the axial direction.

Next, the configurations of the oil guide 200 and the oil guide holding section 5e will be explained. As shown in FIG. 19, etc., the oil guide 200, which is a resin molded product, includes a substantially circular flat base 201, and a substantially cylindrical tube portion 202 erected at the center of one surface 201a of the base 201. . A hole communicating with the cylindrical part 202 is provided in the center of the base 201, so that oil can flow from the back surface 201b side of the base 201 through the inside of the cylindrical part 202 to the outside of the cylindrical part 202. The outer diameter of the cylindrical portion 202 is smaller than the inner diameter of the input shaft oil passage 10a of the speed change input shaft 10, and the cylindrical portion 202 is configured to be insertable into the input shaft oil passage 10a.

The diameter of the base portion 201 is set smaller than the outer diameter of the bearing 31 that supports the left end portion of the speed change output shaft 20. The bearing 31 is supported by a substantially cylindrical concave bearing support portion 5d provided on the left inner wall 5b of the main body portion 5 of the transmission case 4. The base portion 201 of the oil guide 200 is held by a substantially cylindrical concave oil guide holding portion 5e provided at the bottom of the bearing support portion 5d and having a smaller diameter than the bearing support portion 5d. The bearing 31 is, for example, a shielded/sealed ball bearing with a metal shield or a rubber seal attached to the side surface.

The base 201 is provided with a protruding rib portion 201c that protrudes in a direction opposite to the one surface 201a at the peripheral edge of the back surface 201b. The rib portion 201c is provided along the peripheral edge of the base portion 201, and is provided in a C-shape in which a portion of the circle is cut out.

Claw portions 203 that protrude outward in the radial direction of the base portion 201 are provided at three locations on the outer peripheral surface of the rib portion 201c (peripheral portion of the base portion 201). The three claws 203 are arranged at equal intervals along the peripheral edge of the base 201, and one claw 203 is positioned opposite to the cutout of the rib 201c across the center of the base 201. It is provided.

As shown in FIG. 19(C), the three claws 203 are provided closer to the rib back surface 201d on the outer circumferential surface of the rib portion 201c, and are positioned closer to the rib back surface 201d in the radial direction of the base 201. It is provided with an inclined portion 203a that is inclined at a slope.

The rib portion 201c is formed so that a portion near the claw portion 203 is wider than other portions, and the wide portion is located at a position closer to the center of the base portion 201 than the claw portion 203 with an interval from the claw portion 203. An opening 204 is formed therein. The opening 204 is provided so as to penetrate from the one surface 201a of the base 201 to the back surface 201d of the rib, and the portion of the base 201 (rib portion 201c) between the claw portion 203 and the opening 204 is bent and deformed. The claw portion 203 is configured to be movable toward the center of the base portion 201.

The base portion 201 is provided with a tongue portion 205 that projects radially outward from a position where the rib portion 201c is cut out. The tongue portion 205 extends radially outward from the peripheral edge of the base portion 201, is bent in a direction parallel to the protruding direction of the cylindrical portion 202, and is further bent radially outward, so that the tongue portion 205 has a crank-like shape when viewed from the side. .

As shown in FIGS. 12 and 20(B), the oil guide 200 includes an oil receiver 100 attached to the main body 5 of the transmission case 4, and an oil supply end 180 of the oil receiver 100 supporting the receiver of the main body 5. While engaged with the groove 5c, the tongue portion 205 is attached to the oil guide holding portion 5e with the tongue portion 205 positioned within the receiver support groove 5c, as shown in FIGS. 12 and 20(A).

The tongue portion 205 of the oil guide 200 is provided within the receiver support groove 5c so as to cover the input shaft supply port 181 of the oil receiver 100 from the right side. Thereby, the oil flowing out from the input shaft supply port 181 passes between the tongue portion 205 and the inner wall of the main body portion 5, and efficiently and reliably flows into the oil storage portion 5f from the notch portion of the rib portion 201c. It is configured as follows. The oil supplied to the oil storage portion 5f is supplied to the input shaft oil passage 10a of the speed change input shaft 10 through the cylindrical portion 202 of the oil guide 200.

As shown in FIG. 19(C), the oil guide holding portion 5e of the main body portion 5 of the transmission case 4 has an inner wall surface 5i surrounding the peripheral edge portion (outer peripheral surface of the rib portion 201c) of the base portion 201 of the oil guide 200; It includes a stepped portion 5k that the rib back surface 201d of the rib portion 201c comes into contact with, and an engagement groove 5j that engages with the claw portion 203 of the oil guide 200. The inner diameter of the inner wall surface 5i is slightly larger than the outer diameter of the rib portion 201c of the oil guide 200, and smaller than the virtual circle concentric with the center of the base portion 201 and passing through the tip of the claw portion 203.

When attaching the oil guide 200 to the oil guide holding part 5e, align the tongue part 205 with the receiver support groove 5c and push the oil guide 200 toward the stepped part 5k, so that the inclined part 203a of the claw part 203 is The claw portion 203 comes into contact with the opening corner of the guide holding portion 5e (the end of the inner wall surface 5i on the bearing support portion 5d side), and as the oil guide 200 is moved toward the stepped portion 5k, the claw portion 203 increases in diameter along the inclined portion 203a. displacement inward. The oil guide 200 is further pushed in until the rib back surface 201d contacts the stepped portion 5k. The claw portion 203 reaches the engagement groove 5j, is displaced radially outward by the elastic force of the base 201 portion (rib portion 201c portion) outside the opening 204, and engages with the engagement groove 5j. In this way, the oil guide 200 can be attached to the oil guide holding portion 5e easily and in a short time.

When assembling the manual transmission 1, before connecting the main body 5 and the lid 6, as shown in FIGS. 6 and 7, a select shaft 75, a select outer lever 77, a select The arm 80, oil receiver 100, and oil guide 200 are assembled, and the transmission gear mechanism 2, switching mechanism 3, etc. are assembled to the lid part 6. Then, when the main body part 5 and the lid part 6 are connected, the bearing 31 is fitted into the bearing support part 5d of the main body part 5, as shown in FIG. The movement of the oil guide 200 to the right is restricted by an annular spacer member 39 provided on the left side of the outer ring 31).

Further, the tip of the cylindrical portion 202 of the oil guide 200 is located closer to the bottom of the bearing support 5d (on the oil guide holding portion 5e side) than the opening edge of the bearing support 5d (edge on the lid portion 6 side). Therefore, when the bearing 31 is fitted into the bearing support portion 5d, the bearing 31 does not come into contact with the tip of the cylindrical portion 202, and damage to the cylindrical portion 202 can be prevented.

Note that the configuration of each part in the present invention is not limited to the illustrated embodiment, and various changes can be made without departing from the spirit of the present invention. For example, the manual transmission 1 of the embodiment is employed in a front wheel drive type, but is not limited to this, and may be employed in a rear wheel drive type or a four wheel drive type. is also possible.

1 Manual transmission (an example of a transmission)
4 Transmission case 11 First speed input gear 12 Second speed input gear 17 Reverse input gear 21 First speed output gear 22 Second speed output gear 27 Reverse power gear 100 Oil receiver 101 Receiver main body 102 capture member 102a Inclined capture surface portion 102b Oil blocking portion 150 3rd oil passage

Claims (3)

A transmission lubrication structure in which oil scooped up by a gear provided in a transmission case is collected by a bucket-shaped oil receiver and guided toward a lubricated part,
The oil receiver includes a receiver body having a passage that guides the collected oil toward the lubricated part, and an inclined capture surface part that is non-removably attached to the upper surface of the receiver body and that guides the captured oil to the passage. and a capturing member having
A breather chamber of a breather mechanism that communicates between the inside and outside of the transmission case is provided on an inner wall of the transmission case,
A lubricating structure for a transmission, wherein the capture member is disposed between a hole that communicates between the inside of the transmission case and the breather chamber, and the gear. 2. The capturing member according to claim 1, wherein the capturing member includes the inclined capturing surface portion whose proximal end side is connected to the receiver main body and extends diagonally upward, and an oil blocking portion extending diagonally downward from the distal end of the inclined capturing surface portion. Lubrication structure of the described transmission. 3. The transmission lubrication structure according to claim 2, wherein the oil blocking portion is disposed between the gear and the hole that communicates between the inside of the transmission case and the breather chamber.

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