JP6271308B2 - Oil strainer - Google Patents

Description

  The present invention relates to an oil strainer that is installed in a case for storing lubricating oil and hydraulic oil used in a vehicle transmission or the like, and that sucks and filters the oil in the case.

  Oil used as lubricating oil and hydraulic oil for a transmission mounted on a vehicle is stored in an oil reservoir provided at the bottom of the transmission case. The oil stored in the oil reservoir is sucked up by an oil pump. The oil sucked up by the oil pump from the oil reservoir is supplied to a portion where lubrication is required in the transmission mechanism or the like and then returned to the oil reservoir.

  An oil strainer for filtering the oil sucked up by the oil pump is installed in the transmission case. The oil strainer has a hollow container-like main body with a built-in filter member and a suction port for sucking oil into the main body, and is sucked from the suction port by the operation of an oil pump installed on the downstream side. After the oil is filtered by the filter member, it is sent to the oil pump.

  Here, the suction port of the oil strainer is opened on the bottom surface of the main body portion or the like and is immersed in the oil in the transmission case. However, if the oil in the transmission case is biased due to sudden acceleration / deceleration or acceleration caused by turning when the vehicle is traveling and the oil level is largely inclined, the suction port may be exposed from the oil level to the air. If it does so, there exists a possibility that the phenomenon that it may be mixed with oil from a suction port and air may be attracted | sucked may occur.

  Therefore, in the conventional oil strainer described in Patent Document 1, the suction port provided at the bottom of the main body is disposed near the bottom of the transmission case. Thereby, it is difficult to expose the suction port from the oil level of the oil stored in the transmission case, and the phenomenon that air is sucked into the oil through the suction port is suppressed. Moreover, in the oil strainer described in Patent Document 1, the filtering member and the flange portion of the main body are arranged to be inclined to the right or left with respect to the traveling direction of the vehicle. Thereby, while the part which air accumulates in a main-body part is reduced, it is comprised so that the air (bubble) mixed in oil may be easily discharged | emitted upwards along a flange part.

JP 2005-291408 A

  However, in the oil strainer described in Patent Document 1, since the suction port provided at the bottom of the main body is disposed near the bottom surface of the transmission case, the height of the main body is increased accordingly. , The volume increases. Thereby, the external dimension of the whole oil strainer is large. Further, the outer dimension of the entire oil strainer is also increased by arranging the filtering member and the flange portion of the main body portion to be inclined to the right or left with respect to the traveling direction of the vehicle. As a result, there is a possibility that the degree of freedom of the layout of the oil strainer in the transmission case cannot be secured sufficiently.

  The present invention has been made in view of the above problems, and can effectively prevent the suction of air from the suction port while reducing the size of the oil strainer by reducing the outer dimensions thereof. Another object of the present invention is to provide an oil strainer that can stabilize the supply of oil by promoting the separation of bubbles mixed in the oil.

  In order to solve the above problems, an oil strainer according to the present invention is installed in a case (2) for storing oil used as lubricating oil and hydraulic oil, and suctions and filters the oil in the case (2). An oil strainer (70) that has a main body (71) that houses a filtering member (71b) for filtering the oil therein, and a cylindrical shape that protrudes downward from the bottom (71a) of the main body (71) The suction part (80), a suction port (78) provided at the lower end of the suction part (80), and a position surrounding the suction port (78) can float on the oil surface (L) of the oil. A float member (74), and the suction part (80) is connected to the first suction cylinder (72) connected to the bottom part (71a) of the main body part (71) and the lower end part (73c). Second suction cylinder with suction port (78) formed 73), and the second suction cylinder (73) is connected to the first suction cylinder (72) so as to be relatively movable in the axial direction directly or via one or a plurality of other suction cylinders. The float member (74) is attached to the second suction cylinder (73), and the second suction cylinder (73) and the float member (74) are integrated in the axial direction. It is configured to move.

  In the oil strainer according to the present invention, the float member and the second suction cylinder follow the oil level by attaching the float member floating on the oil level of the oil stored in the case to the second suction cylinder. Moving. Thereby, when the height position of the oil level of the oil stored in the case changes, the suction port moves following the position of the oil level by sliding the second suction cylinder in the axial direction. . Therefore, it is possible to effectively prevent the suction port from being exposed from the oil surface. Therefore, oil can be sucked without sucking air from the suction port.

  That is, in the oil strainer according to the present invention, the cylindrical suction portion protruding downward from the bottom portion of the main body portion has a multi-stage cylindrical shape, and the float member is attached to the lowermost second suction cylinder, so that the suction port Is configured to prevent the oil from being exposed from the oil surface. Therefore, since it is not necessary to increase the volume of the main body portion of the oil strainer, the overall size of the oil strainer can be reduced. Thus, by downsizing the oil strainer, the degree of freedom in designing the layout when installing is increased as compared with an oil strainer having a conventional configuration.

  In the oil strainer (70) according to the present invention, the float member (74) may be attached so as to be swingable with respect to the axial direction of the second suction cylinder (73).

  According to this configuration, when the oil level of the oil stored in the case is inclined, the float member is inclined with respect to the axial direction of the second suction cylinder so that the float member follows the inclination of the oil surface. The angle will change. Therefore, not only when the oil level of the oil stored in the case changes but also when the oil level is inclined, the oil can be sucked without sucking air from the suction port.

  Further, in the oil strainer (70) according to the present invention, the float member (74) may be formed in an annular shape surrounding the entire periphery of the suction port (78). According to this configuration, the oil guided to the inner diameter side of the annular float member surrounding the suction port as the introduction portion is sucked into the suction port. As a result, it is possible to always arrange the oil introduction portion sucked into the suction port toward the oil surface by the float member that follows the change or inclination of the oil surface height position. Accordingly, it is possible to more effectively prevent air from being sucked when the oil stored in the case is sucked from the suction port.

  In the oil strainer (70) according to the present invention, the float member (74) has an inner peripheral surface (75b) facing the second suction cylinder (73) facing the inner side in the radial direction, and a radial direction The outer peripheral surface (75a) facing outward, the lower surface (77a) facing downward and contacting the oil surface (L), the upper surface (77b) facing upward, and the inner surface formed on the inner peripheral surface (75b) A first groove portion (76b) formed by recessing the peripheral surface (75b), and a second groove portion (76a) formed by recessing the lower surface (77a) formed on the lower surface (77a). The first groove portion (76b) extends upward from the lower surface (77a) side and communicates with the upper surface (77b) side, and the second groove portion (76a) extends radially from the inner peripheral surface (75b) side. It may extend outside and communicate with the outer peripheral surface (75a).

  According to this configuration, the air bubbles mixed in the oil can be separated from the inner circumferential groove of the float member and discharged from the lower surface side to the upper surface side. Further, the air mixed in the oil can be separated by the bottom groove of the float member and discharged from the inner peripheral surface side to the outer peripheral surface side. As a result, the effect of separating and discharging the bubbles mixed in the oil can be improved.

  Moreover, in the oil strainer (70) concerning this invention, it is good to provide the removal prevention part (73b) which prevents that the said float member (74) remove | deviates from the said 2nd suction cylinder (73). According to this configuration, it is possible to prevent the float member from being accidentally detached from the second suction cylinder when the float member moves following the change in the oil level. Therefore, it is possible to more effectively prevent the suction port from being exposed from the oil surface even when the height and inclination of the oil surface change abruptly. In addition, as an example of the above-described detachment preventing portion, it is possible to include a protrusion (73b) that can be engaged with a float member (74) provided in the second suction cylinder (73).

  In addition, the code | symbol in said parenthesis shows the code | symbol of the component in embodiment mentioned later as an example of this invention.

  According to the oil strainer according to the present invention, the height of the oil level of the oil stored in the case or the inclination of the oil level is changed while having a simple configuration capable of reducing the outer dimensions. Since the suction port can be prevented from being exposed from the oil surface, the oil can be sucked without sucking air from the suction port. Moreover, separation of bubbles mixed in the oil can be promoted. As a result, the oil supply can be stabilized.

It is a sectional side view of the automatic transmission provided with the oil strainer concerning 1st Embodiment of this invention. It is a longitudinal cross-sectional view of an automatic transmission. It is a perspective view which shows an oil strainer. It is a sectional side view which shows a suction part and a float member. It is the perspective view which looked at the float member from the lower surface side. It is a partial expanded side sectional view of a suction mouth and a float member, (a) is a figure showing a section corresponding to XX arrow of Drawing 3, and (b) corresponds to YY arrow of Drawing 3. It is a figure which shows a cross section. It is a sectional side view of the driving force transmission device provided with the oil strainer concerning 2nd Embodiment of this invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
[First Embodiment]
1 and 2 are diagrams showing an automatic transmission 1 including an oil strainer according to a first embodiment of the present invention. FIG. 1 is a side sectional view of the automatic transmission 1, and FIG. 2 is a longitudinal sectional view of the automatic transmission 1. The automatic transmission 1 shown in these drawings is a stepped automatic transmission having a gear mechanism housed in a transmission case 2. The gear mechanism includes a main shaft 10, a secondary shaft 11, a third shaft 12, a counter shaft 13, and the like arranged in parallel with each other. Further, an idle shaft 14 disposed adjacent to the main shaft 10 and a reverse idle shaft 15 disposed adjacent to the third shaft 12 are also provided. Reference numeral 16 denotes a differential mechanism.

  As shown in FIG. 2, the communication port 31 of the oil strainer 70 is connected to the oil pump 30. The oil pump 30 is connected to a crankshaft 20 of an engine (not shown) via a case 21a of the torque converter 21, and is always driven by the engine. A gear 22 is fixed to the main shaft 10 so as not to rotate, and gears 23 and 24 are rotatably attached. The gear 23 is fixed to the main shaft 10 by engaging the wet multi-plate clutch 25, and the gear 24 is fixed to the main shaft 10 by engaging the wet multi-plate clutch 26.

  As shown in FIG. 1, a portion from the bottom surface 2 a of the transmission case 2 to a predetermined height is an oil reservoir (oil reservoir) 3 in which oil as lubricating oil or hydraulic oil is accumulated. An oil strainer 70 is installed.

  FIG. 3 is a perspective view showing the oil strainer 70. FIG. 4 is a side sectional view showing a suction part 80 and a float member 74, which will be described later, provided in the oil strainer 70. In the following description, the term “upper” or “lower” refers to the upper and lower sides in a state where the oil strainer 70 is installed in the transmission case 2 (in the oil reservoir 3). It corresponds downward. The axial direction refers to the axial direction of the first suction cylinder 72 and the second suction cylinder 73 provided in the suction unit 80 described later, and this axial direction is the same as the vertical direction.

  The oil strainer 70 includes a hollow container-shaped main body (main body case) 71, a filter member 71 b (see FIG. 1) for filtering the oil stored in the main body 71, and the bottom surface (bottom) of the main body 71. A cylindrical suction portion 80 projecting downward from 71a, a suction port 78 provided at the lower end of the suction unit 80, and a position surrounding the suction port 78 can float on the oil level L of the oil in the oil reservoir 3. The float member 74 is provided.

  The suction part 80 includes a first suction cylinder 72 connected to the bottom surface 71a of the main body 71, and a second suction cylinder 73 having a suction port 78 formed at the lower end 73c. The second suction cylinder 73 is the first suction cylinder 73. It is a two-stage cylindrical shape that is connected to the suction cylinder 72 so as to be capable of relative movement (sliding) in the axial direction (vertical direction). Each of the first suction cylinder 72 and the second suction cylinder 73 has a cylindrical shape whose cross section is formed in a substantially rectangular shape. The float member 74 is attached to the second suction cylinder 73, and the second suction cylinder 73 and the float member 74 are configured to move integrally in the axial direction.

  The bottom surface 2a of the transmission case 2 shown in FIG. 1 and the bottom surface 71a of the main body 71 are parallel or substantially parallel to each other. In the following description, the state in which the oil level L of the oil is parallel or substantially parallel to the bottom surface 71 a of the main body 71 is defined as a state in which the oil level L of the oil is not inclined. A state that is not parallel to the bottom surface 71a is a state in which the oil level L of the oil is inclined.

  The first suction cylinder 72 and the second suction cylinder 73 of the suction portion 80 have their axial directions (longitudinal directions) perpendicular or substantially perpendicular to the bottom surface 71 a of the main body portion 71. The second suction cylinder 73 is attached to the inner diameter side of the first suction cylinder 72.

  A protrusion 72b projecting to the inner diameter side formed on the inner peripheral surface of the lower end portion 72a of the first suction cylinder 72, and a collar portion 73a projecting to the outer diameter side formed on the outer peripheral surface of the upper end section 73d of the second suction cylinder 73. Can be engaged. As a result, when the second suction cylinder 73 is positioned at the lowermost end, the collar portion 73a and the projection 72b engage with each other so that the second suction cylinder 73 does not fall down from the first suction cylinder 72. Yes.

  The float member 74 is formed in an annular shape that surrounds the entire periphery of the suction port 78. FIG. 5 is a perspective view of the float member 74 as seen from the lower surface side. In the figure, the float member 74 is shown upside down with respect to the state in which the float member 74 is attached to the second suction cylinder 73. As shown in the figure, the float member 74 has an inner peripheral surface 75b facing the second suction cylinder 73 facing the inner side in the radial direction, an outer peripheral surface 75a facing the outer side in the radial direction, and an oil surface facing the lower side. It has a lower surface 77a in contact with L and an upper surface 77b facing upward. The inner peripheral surface 75b is formed in a substantially rectangular shape along the outer periphery of the second suction cylinder 73, and has a pair of surfaces corresponding to the long sides of the rectangle and another pair of surfaces corresponding to the short sides. ing. The float member 74 is attached to the outer periphery of the second suction cylinder 73 with a slight gap provided between the inner peripheral surface 75 b and the second suction cylinder 73. Thereby, the float member 74 is attached so as to be swingable with respect to the axial direction of the second suction cylinder 73.

  In addition, a protrusion 73 b that protrudes to the outer diameter side is provided on the outer periphery of the lower end portion 73 c of the second suction cylinder 73. The protrusion 73 b is engaged with the inner peripheral surface 75 b of the float member 74 from the lower surface side, thereby preventing the float member 74 from falling off the second suction cylinder 73. The protrusion 73 b constitutes a disengagement prevention unit that prevents the float member 74 from coming off the second suction cylinder 73.

  Further, the upper surface 77b of the float member 74 is formed in an inclined surface shape that inclines in a direction gradually rising from the inner peripheral surface 75b side toward the outer peripheral surface 75a side. Thereby, the float member 74 is formed so that its thickness dimension (thickness dimension in the axial direction) gradually increases from the inner peripheral surface 75b side toward the outer peripheral surface 75a side.

  The float member 74 includes an inner circumferential groove (first groove portion) 76b formed on the inner circumferential surface 75b and a lower surface groove (second groove portion) 76a formed on the lower surface 77a. The inner circumferential groove 76b is a groove formed by recessing the inner circumferential surface 75b of the float member 74 to the outer diameter side, and extends upward from the lower surface 77a side of the float member 74 and communicates with the upper surface 77b side. The lower surface groove 76a is a groove formed by recessing the lower surface 77a of the float member 74 upward, and extends from the inner peripheral surface 75b side to the outer side in the radial direction and communicates with the outer peripheral surface 75a side. The inner peripheral groove 76b and the lower surface groove 76a correspond to approximately the center in the width direction of the pair of surfaces corresponding to the short side of the second suction cylinder 73 and the pair of surfaces corresponding to the long side on the inner peripheral surface 75b. Is formed. Accordingly, a total of four inner circumferential grooves 76b and lower surface grooves 76a are formed in the float member 74.

  6 is a partial enlarged side cross-sectional view of the suction portion 80 and the float member 74, where (a) is a diagram illustrating a cross-section corresponding to the XX arrow in FIG. 3, and (b) is Y-- in FIG. It is a figure which shows the cross section corresponding to Y arrow view. FIG. 6A shows a state where the oil level L is not inclined, and FIG. 6B shows a state where the oil level L is inclined. As shown in FIG. 5 and FIG. 5, the lower surface groove 76a provided in the float member 74 is set to have a larger cross-sectional area than the inner peripheral groove 76b, and the amount of depression is increased. Further, the lower surface groove 76a has an inclined surface shape in which an inner surface (inner bottom surface) 76d gradually inclines upward from the inner peripheral surface 75b side of the float member 74 toward the outer peripheral surface 75a side. Thereby, the groove | channel of the lower surface groove | channel 76a becomes deep gradually from the inner peripheral surface 75b of the float member 74 toward the outer peripheral surface 75a.

  In the oil strainer 70 of the present embodiment, the float member 74 that floats on the oil surface L of the oil stored in the oil reservoir 3 of the transmission case 2 is attached to the second suction cylinder 73, so that FIG. 4 and FIG. 6 (a), the float member 74 and the second suction cylinder 73 move following the oil level L (up and down). Therefore, when the height position of the oil level L of the oil stored in the transmission case 2 changes, the second suction cylinder 73 slides in the axial direction, so that the suction port 78 is positioned at the oil level L. Move to follow. This effectively prevents the suction port 78 from being exposed from the oil level L. Therefore, oil can be sucked without sucking air from the suction port 78.

  That is, in the oil strainer 70 of the present embodiment, the suction part 80 that protrudes downward from the bottom surface 71a of the main body part 71 is a multi-stage (two-stage) cylindrical shape, and the float member 74 is attached to the lowermost second suction cylinder 73. By attaching, the suction port 78 can be effectively prevented from being exposed from the oil surface L. Therefore, it is not necessary to increase the volume of the main body unlike the oil strainer having a conventional structure, so that the overall size of the oil strainer 70 can be reduced. Further, by reducing the size of the oil strainer 70, the degree of freedom in designing the layout when installed in the transmission case 2 is increased as compared with the oil strainer having the conventional configuration.

  In the oil strainer 70 of the present embodiment, the float member 74 is attached so as to be swingable with respect to the axial direction of the second suction cylinder 73. Thereby, as shown in FIG. 6B, when the oil level L of the oil stored in the oil reservoir 3 is inclined, the float member 74 is inclined with respect to the axial direction of the second suction cylinder 73. The angle of the float member 74 changes following the inclination of the oil level L. Therefore, not only when the oil level L of the oil stored in the oil reservoir 3 changes but also when the oil level L is inclined, the oil can be sucked without sucking air from the suction port 78. . Thereby, when the vehicle speed of the vehicle equipped with the automatic transmission 1 is increased, the oil level L of the oil reservoir 3 is decreased, or the oil level L of the oil reservoir 3 is decreased due to sudden turning, rapid acceleration or rapid deceleration of the vehicle. Even when tilted, it is possible to effectively prevent air from being sucked from the suction port 78.

  In the oil strainer 70 of the present embodiment, the float member 74 is formed in an annular shape that surrounds the entire periphery of the suction port 78. With this configuration, the oil guided to the inner diameter side of the annular float member 74 surrounding the suction port 78 is sucked into the suction port 78. As a result, the oil introduction portion sucked into the suction port 78 can always be arranged toward the oil surface L by the float member 74 that follows the change in the height position and the inclination of the oil surface L. . Therefore, it is possible to more effectively prevent air from being sucked when the oil stored in the oil reservoir 3 is sucked from the suction port 78.

  In the oil strainer 70 of the present embodiment, the float member 74 includes an inner peripheral groove (first groove portion) 76b formed on the inner peripheral surface 75b, and a lower surface groove (second groove portion) 76a formed on the lower surface 77a. It has. The inner circumferential groove 76b extends upward from the lower surface 77a of the float member 74 and communicates with the upper surface 77b, and the lower surface groove 76a extends radially outward from the inner circumferential surface 75b of the float member 74 to the outer circumferential surface 75a. Leads to.

  According to this configuration, the air bubbles mixed in the oil can be separated by the inner peripheral groove 76b of the float member 74 and discharged from the lower surface 77a side to the upper surface 77b side. Further, the air bubbles mixed in the oil can be separated by the lower surface groove 76a of the float member 74 and discharged from the inner peripheral surface 75b side to the outer peripheral surface 75a side. As a result, the effect of separating and discharging the bubbles mixed in the oil can be improved.

  Furthermore, the lower surface groove 76a provided in the float member 74 is set to have a larger cross-sectional area than the inner circumferential groove 76b, and the amount of depression is increased. As a result, the lower surface groove 76a is wider (larger) than the inner circumferential groove 76b, so that a relatively large bubble S1 is introduced into the lower surface groove 76a, as shown in FIG. A relatively small (fine) bubble S2 is introduced into the groove 76b. Accordingly, the large bubble S1 is discharged to the outer peripheral surface 75a side of the float member 74 through the lower surface groove 76a, and the small bubble S2 is discharged to the upper surface 77b side of the float member 74 through the inner peripheral groove 76b.

  Further, the bottom surface groove 76a has a bottom surface (upper bottom surface) 76d that is gradually inclined upward from the inner peripheral surface 75b side to the outer peripheral surface 75a side of the float member 74. The bubble S1 entering the groove 76a is guided downstream while rising along the bottom surface 76d. Therefore, it is possible to smoothly discharge the air bubbles that have entered the lower surface groove 76a to the outer peripheral surface 75a side of the float member 74 without retaining them.

  Further, the float member 74 is formed so that its thickness dimension (thickness dimension in the axial direction) gradually increases from the inner peripheral surface 75b side toward the outer peripheral surface 75a side. The thickness dimension is the smallest dimension. Thereby, the length dimension of the inner peripheral groove 76b is suppressed to a short dimension. Therefore, it is possible to smoothly discharge the bubbles that have entered the inner circumferential groove 76b to the upper surface side of the float member 74 in a short time.

  Further, in the oil strainer 70 of the present embodiment, the protrusion 73 b that can be engaged with the float member 74 provided on the second suction cylinder 73 as a detachment prevention section that prevents the float member 74 from being detached from the second suction cylinder 73. It has. According to this configuration, the float member 74 can be prevented from being accidentally detached from the second suction cylinder 73 when the float member 74 moves following the change in the oil level L. Therefore, even when the height or inclination of the oil level L changes abruptly, the suction port 78 can be more effectively prevented from being exposed from the oil level L.

[Second Embodiment]
Next, an oil strainer according to a second embodiment of the present invention will be described. In the description of the second embodiment and the corresponding drawings, the same or corresponding components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted below. Further, matters other than those described below and matters other than those illustrated are the same as those in the first embodiment.

FIG. 7 is a side sectional view of the driving force transmission device 40 including the oil strainer 70 according to the second embodiment of the present invention. As shown in FIG. 7 , the driving force transmission device 40 has a hypoid pinion shaft (not shown) coupled to a propeller shaft (not shown) that is rotationally driven by a driving force transmitted from an engine (not shown). And a hypoid pinion gear 46 formed at the tip of the hypoid pinion shaft, and a hypoid ring gear 47 that meshes with the hypoid pinion gear 46.

  The hypoid ring gear 47 is attached to the outer periphery of a hollow rotary shaft 41 that is arranged coaxially with the left axle 44 and the right axle 43. Therefore, when the hypoid pinion shaft is rotationally driven through the engine and the propeller shaft, the driving force is transmitted to the rotational input shaft 41 through the hypoid pinion gear 46 and the hypoid ring gear 47 so that the rotational input shaft 41 rotates. It has become.

  The rotation input shaft 41 is provided with a left clutch 53 that transmits driving force between the rotation input shaft 41 and the left axle 44 at the end on the side where the hypoid ring gear 47 is attached. A right clutch 52 that transmits driving force between the rotary input shaft 41 and the right axle 43 is provided at the end of the shaft. The rotation of the rotation input shaft 41 is transmitted to the left clutch 53 and the right clutch 52. The driving force transmission device 40 is formed with a gear chamber 45 disposed in the center in the axial direction of the rotary input shaft 41. A pair of clutch chambers 50 and 51 are formed on both sides of the gear chamber 45. Accordingly, the driving force transmission device 40 has a three-part structure including the gear chamber 45 and the pair of clutch chambers 50 and 51.

  A left clutch 53 and a right clutch 52 are installed in the left and right clutch chambers 50 and 51, respectively. The right clutch 52 in the right clutch chamber 50 is composed of a substantially cylindrical clutch housing 54 coupled at the end of the rotation input shaft 41 and a friction material in which a plurality of friction materials are alternately stacked along the axial direction in the clutch housing 51. And a friction engagement portion 56 having the same. A piston housing 57, a cylinder piston 58 accommodated in the piston housing 57, and a return spring 59 that urges the cylinder piston 58 are provided at positions adjacent to the friction engagement portion 56. A piston chamber 60 into which oil is introduced between the piston housing 57 and the cylinder piston 58 is formed in the piston housing 57. Although detailed description is omitted, the left clutch 53 has the same configuration as the right clutch 52.

  The hypoid pinion gear 46 and the hypoid ring gear 47 described above are installed in the gear chamber 45, and an oil strainer 70 is installed in the bottom 45 a of the gear chamber 45. The oil strainer 70 sucks oil accumulated in the bottom 45a. The oil strainer 70 has the same configuration as that of the first embodiment.

  Also in the driving force transmission device 40 of this embodiment, the same effect as that of the first embodiment can be obtained by including the oil strainer 70 according to one embodiment of the present invention.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the technical idea described in the claims and the specification and drawings. Is possible. For example, the automatic transmission 1 and the driving force transmission device 40 shown in the above embodiment are examples of a device including the oil strainer according to the present invention, and the device to which the oil strainer according to the present invention is applied has a configuration other than the above. It may be.

  In addition, the specific shape of the suction portion provided in the oil strainer according to the present invention is an example, and in the above embodiment, the suction portion 80 has the uppermost first suction cylinder 72 as the lowermost second suction cylinder 73. However, in addition to this, the suction part of the oil strainer according to the present invention is connected to the first suction cylinder connected to the bottom part of the main body part and the lower end part. As long as at least a second suction cylinder having a suction port is provided, the uppermost first suction cylinder and the lowermost second suction cylinder are not directly connected to each other, It may be a multi-stage configuration of three or more stages that are connected via a plurality of other suction cylinders so as to be relatively movable in the axial direction.

DESCRIPTION OF SYMBOLS 1 Automatic transmission 3 Oil reservoir 10 Main shaft 30 Oil pump 40 Driving force transmission device 45 Gear chamber 46 Hypoid pinion gear 47 Hypoid ring gear 50 Right clutch chamber 51 Left clutch chamber 70 Oil strainer 71 Main body 71a Bottom surface (bottom)
71b Filtration member 72 First suction cylinder 72a Lower end 72b Projection 73 Second suction cylinder 73d Upper end 73a Collar 73b Projection (disengagement prevention part)
73c Lower end 74 Float member 75a Outer peripheral surface 75b Inner peripheral surface 76a Lower surface groove 76b Inner peripheral groove 77a Lower surface 77b Upper surface 78 Suction port 80 Suction part L Oil surface

Claims (3)

An oil strainer that is installed in a case that stores oil used as lubricating oil and hydraulic oil, and that sucks and filters the oil in the case,
A main body housing a filtering member for filtering the oil;
A cylindrical suction part protruding downward from the bottom of the main body part;
A suction port provided at the lower end of the suction part;
A float member arranged at a position surrounding the suction port and floatable on the oil surface of the oil,
The suction part includes at least a first suction cylinder connected to a bottom part of the main body part and a second suction cylinder in which the suction port is formed at a lower end part, and the second suction cylinder is the first suction cylinder. A multi-stage configuration that is connected to be axially or relative to each other directly or via one or more other suction cylinders,
The float member is attached to the second suction cylinder, and the second suction cylinder and the float member are configured to move integrally in the axial direction , and
The oil strainer , wherein the float member is swingable with respect to an axial direction of the second suction cylinder . Installed in a case for storing oil used as lubricating oil and hydraulic oil, the case
An oil strainer that sucks and filters the oil inside,
A main body housing a filtering member for filtering the oil;
  A cylindrical suction part protruding downward from the bottom of the main body part;
  A suction port provided at the lower end of the suction part;
  A float member disposed at a position surrounding the suction port and capable of floating on the oil surface;
Prepared,
  The suction part includes a first suction cylinder connected to a bottom part of the main body part, and a suction port formed at a lower end part.
At least a second suction cylinder formed, and the second suction cylinder directly with respect to the first suction cylinder
Or a multi-stage configuration connected to be axially movable relative to each other via one or a plurality of other suction cylinders.
The
  The float member is attached to the second suction cylinder, and the second suction cylinder and the float member are configured to move integrally in the axial direction, and
  The float member is formed in an annular shape surrounding the entire periphery of the suction port, and has an inner peripheral surface facing the second suction cylinder facing the inner side in the radial direction and an outer peripheral surface facing the outer side in the radial direction. A lower surface facing downward and in contact with the oil surface, an upper surface facing upward, a first groove portion recessed from the inner peripheral surface and leading from the lower surface side to the upper surface side, and the lower surface recessed. And a second groove portion communicating from the inner peripheral surface side to the outer peripheral surface side.
Oil strainer characterized by that. 3. The oil strainer according to claim 1, further comprising a detachment prevention unit that prevents the float member from detaching from the second suction cylinder. 4.

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