JP6077923B2 - Cover member - Google Patents

Description

  The present invention relates to a cover member that covers an oil filter.

  The automatic transmission of a vehicle has an oil pump and oil, and the oil pump circulates high-pressure oil in the automatic transmission. The oil circulation path is provided with an oil filter to remove foreign matters such as sputters and cutting chips mixed in the circulation.

  Patent Document 1 discloses a transmission case that houses a transmission mechanism, a recess that is formed on the surface of the transmission case and communicates with an oil passage, a filter case that is attached to the recess, and an oil filter that is built in the filter case. Is provided. The filter case has an insertion hook part inserted into a gap formed in the transmission case, and a fixing hook part fastened to the surface of the transmission case with a fixing screw. The filter case is fixed to the transmission case by the insertion hook part and the fixing hook part.

JP 2011-21666 A

  In the technique of Patent Document 1, in order to attach the filter case to the transmission case, the fixing flange of the filter case is fastened with a fixing screw, which increases the number of parts and the weight.

  This invention is made | formed in view of such a subject, The objective is to provide the cover member reduced in weight.

  In order to solve the above-described problems, a cover member according to an aspect of the present invention is a cover member that is attached to an attachment hole formed in a case so as to cover an oil filter, with one end closed and the other end opened. A cylindrical main body for covering the oil filter, a screw groove formed on the outer peripheral surface on the opening side of the main body and screwed into the mounting hole, and a tension from the outer peripheral surface of the main body on the closing side of the screw groove. And a rotation restricting portion supported by the support portion. The rotation restricting portion is engaged with the surface of the case radially outside the attachment hole and restricts the rotation of the cover member in a state where the cover member is attached to the attachment hole.

  According to this aspect, the cover member can be attached to the case by the screw groove, and the weight can be reduced as compared with the case where the cover member is attached to the case using a bolt.

  According to the present invention, the cover member can be reduced in weight.

It is a figure for demonstrating the cover member of embodiment. It is a bottom view of the cover member which accommodated the oil filter. It is a figure for demonstrating the attachment hole of a case. FIG. 4A is a side view of the cover member, and FIG. 4B is a plan view of the cover member. 5A is a cross-sectional view taken along line AA of the cover member attached state shown in FIG. 4B, and FIG. 5B is a cover member attached state shown in FIG. 4B. It is sectional drawing of line segment BB. It is a figure for demonstrating the cover member of a modification.

  Drawing 1 is a figure for explaining cover member 10 of an embodiment. FIG. 1A is a perspective view seen from the front surface side of the cover member 10, and FIG. 1B is a perspective view seen from the back surface side of the cover member 10. Here, the same or equivalent components and members shown in the drawings are denoted by the same reference numerals, and repeated description thereof is omitted as appropriate. Further, the central axis of the cover member 10 is simply used as an “axis” in the following description, and the direction along the axis is referred to as an axial direction.

  The cover member 10 is attached to a case of a transmission such as a CVT (Continuously Variable Transmission) of a vehicle. The transmission includes a case that covers the whole, a piping unit that is built in the case, an oil pump that circulates oil through the piping unit, an oil filter 12 that filters the oil, and a cover member 10 that covers the oil filter 12. . FIG. 1B shows the oil filter 12 accommodated in the cover member 10. The transmission case is composed of a plurality of cases.

  Cover member 10 is attached to an attachment hole provided on the surface of the case of the transmission so as to cover oil filter 12. The cover member 10 surrounds the oil filter 12 and suppresses oil leakage. Oil can be cooled by arrange | positioning the cover member 10 outside.

  The oil flowing in from the supply port 34 shown in FIG. 1B passes through the oil filter 12 and is discharged from the discharge port 36. The oil filter 12 removes foreign matters such as metal powder from the oil circulating in the transmission.

  Since the cover member 10 is formed of a resin material, the cost can be suppressed while reducing the weight. The cover member 10 includes a main body portion 20, a male screw groove 22, a support portion 24, a convex portion 26, and an outer peripheral polygonal portion 32. The main body 20 is formed in a cylindrical shape, and has an opening 20a at one end and a closing portion 20b at the other end.

  The male screw groove 22 is formed on the outer peripheral surface on the opening side of the main body 20 and is screwed into the mounting hole of the case. The male screw groove 22 is located closer to the opening 20a than the support 24. The outer peripheral polygonal portion 32 is formed in an octagonal shape on the outer peripheral surface on the closing side of the main body portion 20. The outer peripheral polygonal portion 32 facilitates engagement with the operator's hand or a predetermined jig when rotating the main body portion 20.

  The support portion 24 protrudes from the outer peripheral surface of the main body portion 20 on the closing side of the male screw groove 22. The support part 24 includes an elastic part 30 and an overhang part 28. The plurality of overhang portions 28 project radially outward from the outer peripheral surface of the main body portion 20, and support both ends of the elastic portion 30 between the plurality of overhang portions 28. The plurality of elastic portions 30 are formed thinner than the overhang portion 28 and have elasticity, and support the convex portion 26. The elastic portion 30 is a two-handed piece that is formed in an arc shape so as to surround the main body portion 20 while being separated from the main body portion 20, and both ends are supported by the overhanging portion 28. The elastic portion 30 has higher elastic force and lower rigidity than the overhang portion 28.

  The convex portions 26 are respectively formed on the back surfaces of the plurality of elastic portions 30. The convex portion 26 is movable in the axial direction by the elastic portion 30. The back surface of the elastic part 30 is located on the opening side of the main body part 20 in the axial direction. The convex portion 26 functions as a rotation restricting portion that restricts the rotation of the cover member 10 in a state where the male screw groove 22 is screwed into the attachment hole and is engaged with the surface of the case 14 on the radially outer side of the attachment hole.

  FIG. 2 is a bottom view of the cover member 10 in which the oil filter 12 is accommodated. The oil filter 12 is inserted from the opening 20 a of the main body 20. A supply port 34 through which oil flows is formed in the center of the oil filter 12, and a discharge port 36 is formed between the outer peripheral surface 12 b of the oil filter 12 and the inner peripheral surface 20 c of the main body 20. Oil entering from the supply port 34 is filtered by the oil filter 12 and exits from the discharge port 36. The supply port 34 and the discharge port 36 are communicated with each pipe of the pipe unit.

  Four overhang portions 28 are arranged at equal intervals in the circumferential direction, and the elastic portion 30 is formed so as to connect the overhang portions 28. Four convex portions 26 are provided between the overhang portions 28, and four convex portions 26 are arranged at equal intervals in the circumferential direction.

  FIG. 3 is a view for explaining the mounting hole 14 a of the case 14. The case 14 of the transmission has a box shape, and this figure shows a part of the surface 14d of the case 14.

  The case 14 has a mounting hole 14a, a female screw groove 14b, and a recess 14c. The mounting hole 14a communicates with the supply port and the discharge port of the piping unit. The mounting hole 14a has a female screw groove 14b on the inner peripheral surface. The female screw groove 14 b is screwed into the male screw groove 22 of the cover member 10. The female screw groove 14b is provided apart from the opening end of the mounting hole 14a.

  The plurality of recesses 14c are formed to be recessed on the surface 14d of the case 14 and the periphery of the mounting hole 14a. The concave portion 14 c locks the convex portion 26 when the cover member 10 is attached. The concave portion 14c is larger than the convex portion 26 and accommodates the convex portion 26 with a margin.

  FIG. 4A is a side view of the cover member 10, and FIG. 4B is a plan view of the cover member 10. Fig.5 (a) shows sectional drawing of line segment AA of the attachment state of the cover member 10 shown in FIG.4 (b), FIG.5 (b) shows the cover member 10 shown in FIG.4 (b). Sectional drawing of line segment BB of an attachment state is shown.

  As shown in FIG. 5A, the male screw groove 22 of the cover member 10 is screwed into the female screw groove 14b of the attachment hole 14a. The main body portion 20 on the side of the closing portion 20 b above the support portion 24 is exposed on the surface 14 d of the case 14. The cover member 10 further includes an O-ring 40 between the male screw groove 22 and the support portion 24. The male screw groove 22 is separated from the support portion 24 by more than half of the axial length of the male screw groove 22, and an O-ring 40 is provided therebetween. The O-ring 40 is a sealing member that seals so that oil does not leak. The O-ring 40 and the male screw groove 22 are also separated by a predetermined axial length. The cover member 10 receives oil pressure from the opening 20a to the closing portion 20b, that is, upward in the axial direction.

  By the way, conventionally, the cover member is formed of a metal material, and the flange formed on the cover member is screwed to the surface 14d of the case 14 with a plurality of bolts to suppress oil leakage. On the other hand, the cover member 10 of the embodiment is formed from a resin material. Transmission oil is kept at a very high pressure, and deformation of the resin material may cause oil leakage from places other than bolted portions. That is, oil leakage may occur even if the bolt is completely tightened. Further, the stress on the cover member 10 is biased due to the non-uniform bolt tightening degree, and the resin material may be deformed.

  The cover member 10 of the embodiment can be screwed by the male screw groove 22 to make the stress uniform, suppress deformation, and suppress oil leakage. Further, since the cover member 10 is uniformly supported by the male screw groove 22, the cover member 10 can be prevented from being deformed and tilted. Moreover, it can reduce in weight compared with the case where a cover member is provided with a flange and fastened with bolts. Further, although various vibrations are generated in the transmission, it is possible to suppress loosening of the screws with respect to the vibration as compared with the bolts. Further, by attaching the cover member 10 with the male screw groove 22, the oil filter 12 can be easily replaced by removing the cover member 10. By replacing the oil filter 12, the pressure loss in the oil filter 12 is reduced, and the load on the oil pump can be suppressed.

  As shown in FIG. 5A, a holding groove 38 is formed on the outer peripheral surface between the support portion 24 of the main body 20 and the male screw groove 22, and the O-ring 40 is held by the holding groove 38. The O-ring 40 is located closer to the opening 20a than the support 24. Since the screw 20 is screwed on the opening 20a side from the O-ring 40, the male screw groove 22 is also sealed to form a double seal, and oil leakage can be further suppressed. Further, when the O-ring 40 is in pressure contact with the inner peripheral surface of the mounting hole 14a as the cover member 10 is inclined by oil, the O-ring 40 is prevented from being crushed by supporting it with the male screw groove 22, and oil leakage is prevented. Can be suppressed. In addition, even when the cover member 10 is lifted, the O-ring 40 is sealed on the inner peripheral surface, so that a reduction in sealing performance can be suppressed.

  As shown in FIG. 5B, the convex portion 26 is accommodated in the concave portion 14c in a state where the cover member 10 is attached to the attachment hole 14a. By forming irregularities around the attachment hole 14a in the cover member 10 and the case 14, a configuration for restricting the rotation of the cover member 10 can be easily provided. By restricting the rotation of the cover member 10, it is possible to prevent the cover member 10 from loosening due to the vibration of the transmission. As shown in FIG. 5B, the convex portion 26 has a tapered surface on the front side in the screw tightening direction (left direction in the drawing) and a vertical surface on the rear side in the screw tightening direction.

  The protruding height of the convex portion 26 is larger than the average pitch of the male screw grooves 22. The average pitch of the male screw grooves 22 is a value obtained by averaging the pitches between the apexes of the adjacent threads of the male screw groove 22 as one pitch. As a result, when the support member 24 reaches an interval from the surface 14d to 1 pitch when the cover member 10 is screwed into the mounting hole 14a, the convex portion 26 can be inserted into the concave portion 14c. That is, the convex part 26 can be reliably put into the concave part 14c.

  Further, by providing the convex portion 26 on the elastic portion 30, when the cover member 10 is attached to the attachment hole 14a, even if the convex portion 26 enters the concave portion 14c before the attachment is completed, the elastic portion 30 is deflected to cause the convex portion. The cover member 10 can be tightened while 26 is taken out from the recess 14c. Thereby, the attachment operation | work of the cover member 10 can be done easily.

  In addition, since both ends of the elastic portion 30 are supported by each of the overhang portions 28, durability is enhanced as compared with the case where only one end is supported. As a result, even when the cover member 10 is rotated too much during the mounting operation and a load is applied from the convex portion 26 to the elastic portion 30, it is possible to prevent the elastic portion 30 from being damaged.

  In the modification, the convex portion 26 has vertical surfaces on both the front side and the rear side in the screw tightening direction. The vertical surface of the convex portion 26 is formed perpendicular to the elastic portion 30. When the cover member 10 of the modified example is rotated in the screw tightening direction and the opposing convex portions 26 and the confronting surfaces of the concave portions 14c abut in the screw tightening direction, the attachment is completed. Since the opposing surfaces of the convex portion 26 and the concave portion 14c are orthogonal to the screw tightening direction, the rotation of the cover member 10 stops when they contact each other. That is, when the convex portion 26 enters the concave portion 14c, the rotation stops when the convex portion 26 contacts the concave portion 14c, whether the cover member 10 is rotated in the screw tightening direction or the reverse screw loosening direction. Thereby, it can be made to recognize that the attachment was completed to the operator and attachment work can be made easy.

  FIG. 6 is a view for explaining a cover member 100 of a modified example. 6A is a perspective view seen from the front surface side of the cover member 100, and FIG. 6B is a perspective view seen from the back surface side of the cover member 100. FIG.

  Compared to the cover member 10 shown in FIG. 1, the cover member 100 of the modified example has the same configuration of the main body portion 20 and the male screw groove 22, but is different in the configuration of rotation restriction of the support portion 124 and the convex portion 126. In the modified example, the differences will be mainly described.

  The cover member 100 includes a main body part 20, a male screw groove 22, a support part 124, a convex part 126, an elastic part 130, and an O-ring (not shown). The support portion 124 is formed so as to protrude outward in the radial direction from the outer peripheral surface of the cylindrical main body portion 20. The support part 124 is formed as an annular flange. The support part 124 includes an elastic part 130 on which the convex part 126 is provided. The support portion 124 is more durable than the support portion 24 of the cover member 100.

  The elastic part 130 and the convex part 126 are formed as an elastic claw body and are provided as a pair. A convex portion 126 is provided at one end of the elastic portion 130, and the other end is supported. The convex portion 126 is formed on the back surface of the elastic portion 130 and is movable in the axial direction by the bending of the elastic portion 130.

  The convex portion 126 functions as a rotation restricting portion that restricts the rotation of the cover member 100 in a state where the male screw groove 22 is screwed into the mounting hole 14a and is engaged with the concave portion 14c. The convex portion 126 has a tapered surface 126a on the front side of the screw tightening direction 132 and has a locking surface 126b on the rear side of the screw tightening direction 132. The tapered surface 126a is inclined with respect to the axial direction of the main body 20, while the locking surface 126b extends along the axial direction.

  That is, when the cover member 100 is rotated in the screw tightening direction 132, the tapered surface 126a abuts on the stepped portion of the concave portion 14c, so that the convex portion 126 is not caught by the concave portion 14c. On the other hand, when the cover member 100 is rotated in the screw loosening direction, the locking surface 126b comes into contact with the step of the concave portion 14c, and the convex portion 126 is locked. Thus, the convex part 126 is comprised so that it may latch on the recessed part 14c, only when it rotates in the screw loosening direction. Thereby, even if a manufacturing error occurs in the protruding height of the male screw groove 22 or the convex portion 126, the convex portion 126 can be easily put into the concave portion 14c.

  As another modification, the convex portion 126 may have a locking surface on the front side and the rear side in the screw tightening direction 132, respectively. That is, the convex portion 126 is configured to be engaged with the concave portion 14c regardless of whether the cover member 100 is rotated in the screw tightening direction 132 or in the reverse screw loosening direction. According to this configuration, when the cover member 100 is attached, the cover member 100 is rotated in the screw tightening direction, and when the convex portion 126 comes into contact with the concave portion 14c, the screw tightening is stopped and the attachment is completed. Thereby, it can be made to recognize that the attachment was completed to the operator and attachment work can be made easy. In addition, the convex part 26 of the cover member 10 shown in FIG. 1 may have a locking surface in the screw tightening direction front side and back side, respectively. Moreover, the convex part 26 of the cover member 10 shown in FIG. 1 may have a taper surface on the front side in the screw tightening direction and may have a locking surface on the rear side.

  The present invention is not limited to the above-described embodiments, and various modifications such as design changes can be added to the embodiments based on the knowledge of those skilled in the art. Embodiments described may also be included within the scope of the present invention.

  In the embodiment, the mode in which the convex portion 26 is provided in the cover member 10 and the concave portion 14c is provided in the case 14 is shown, but the present invention is not limited to this mode. For example, the convex / concave relationship may be reversed, and a convex portion may be provided on the surface of the case 14 and the concave portion may be provided on the support portion 24 of the cover member 10. Also according to the modification, the rotation of the cover member 10 can be restricted by the engagement between the concave portion and the convex portion.

  DESCRIPTION OF SYMBOLS 10 Cover member, 12 Oil filter, 14 Case, 14a Mounting hole, 14b Female thread groove, 14c Recessed part, 14d Surface, 20 Main body part, 20a Opening part, 20b Closure part, 22 Male screw groove, 24 Support part, 26 Convex part 28 overhanging part, 30 elastic part, 32 outer peripheral polygon part, 34 supply port, 36 discharge port, 38 holding groove, 40 O-ring.

Claims (6)

A cover member attached to the mounting hole formed in the case so as to cover the oil filter,
One end is closed, the other end is open, and a cylindrical main body for covering the oil filter,
A thread groove formed on the outer peripheral surface on the opening side of the main body, and screwed into the mounting hole;
A support portion projecting radially outward from the outer peripheral surface of the main body portion on the closing side from the screw groove;
A rotation restricting portion supported by the support portion,
The rotation restricting portion is formed on the support portion and is one of a convex portion protruding in the axial direction and a concave portion recessed in the axial direction,
One of the convex portion and the concave portion is either the convex portion or the concave portion formed on the surface of the case on the radially outer side of the attachment hole in a state where the cover member is attached to the attachment hole. A cover member that is locked to the cover member to restrict the rotation of the cover member. A cover member attached to the mounting hole formed in the case so as to cover the oil filter,
One end is closed, the other end is open, and a cylindrical main body for covering the oil filter,
A thread groove formed on the outer peripheral surface on the opening side of the main body, and screwed into the mounting hole;
A support portion protruding from the outer peripheral surface of the main body portion on the closing side from the screw groove;
A rotation restricting portion supported by the support portion,
The rotation restricting portion restricts the rotation of the cover member by engaging with the surface of the case on the radially outer side of the attachment hole in a state where the cover member is attached to the attachment hole.
The said support part has an elastic part which supports the said rotation control part, The cover member characterized by the above-mentioned. A cover member attached to the mounting hole formed in the case so as to cover the oil filter,
One end is closed, the other end is open, and a cylindrical main body for covering the oil filter,
A thread groove formed on the outer peripheral surface on the opening side of the main body, and screwed into the mounting hole;
A support portion protruding from the outer peripheral surface of the main body portion on the closing side from the screw groove;
A rotation restricting portion supported by the support portion,
The rotation restricting portion is either one of a convex portion and a concave portion formed in the support portion,
One of the convex portion and the concave portion is either the convex portion or the concave portion formed on the surface of the case on the radially outer side of the attachment hole in a state where the cover member is attached to the attachment hole. To restrict the rotation of the cover member,
The cover member according to claim 1, wherein a protruding height of the convex portion is larger than an average pitch of the screw grooves.   The cover member according to claim 2, wherein the support portion has an overhang portion that projects from an outer peripheral surface of the main body portion and supports both ends of the elastic portion.   4. The cover member according to claim 1, wherein the cover member is rotated in the screw tightening direction, and the attachment is completed when the convex portion and the concave portion facing each other in the screw tightening direction come into contact with each other.   The cover member according to any one of claims 1 to 5, wherein an O-ring is provided on an outer peripheral surface of the main body portion between the screw groove and the support portion.

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