JP2006151152A - Washing device of lighting fixture for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent rotation of a piston relative to a cylinder and to improve dust-prevention property. <P>SOLUTION: The washing device of a lighting fixture for a vehicle is provided with the cylinder 2 fed with a washing liquid; the piston 3 having a washing liquid passage 3a at the inside and slidably bonded to the cylinder; a nozzle part having an injection port 511 for injecting the washing liquid; and a check valve 4 interposed between the nozzle part and the piston. In the washing device 1 of the lighting fixture for the vehicle, a dust cover 25 contacted with an outer peripheral surface of the piston is provided on a distal end of the cylinder and an outer peripheral surface of a part slide-contacted with the cylinder of the piston formed by a circle other than roundness such as ellipse or ellipse viewed from a cross section perpendicular to an axial direction or a flat surface and/or a curved surface continued with an angle each other. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a novel vehicle lamp cleaning apparatus. Specifically, the present invention relates to a technique for preventing a piston from rotating with respect to a cylinder and improving dust resistance.

  A vehicular lamp, for example, a headlamp, is an important functional component, and it must be avoided that the beam irradiation capability is impaired.

  One of the causes of the deterioration of the illumination capability of vehicle lamps such as headlamps is the contamination of the front lens. For example, when traveling on an unpaved road during rainfall or melting of snow, muddy water splashed by the vehicle, the preceding vehicle, and the oncoming vehicle flies to the front lens, which may interfere with beam irradiation due to mud adhering to the front lens. May occur. For this reason, it is necessary to remove dirt such as mud adhering to the front lens in a timely manner even during traveling.

  Therefore, there is a demand for a vehicular lamp cleaning device for spraying cleaning liquid onto the front lens as needed to wash off dirt such as mud adhering to the front lens even during traveling.

  In the vehicular lamp cleaning apparatus as described above, since the cleaning liquid is sprayed onto the front lens, the ejection port needs to be positioned further forward than the front lens. By the way, it is unfavorable from the viewpoint of safety that the nozzle portion having the injection port is located further forward than the front lens because a protrusion exists on the front portion of the vehicle. The so-called pop-up type was conceived, and the nozzle part with an injection port is usually located on the back side of a bumper or the like, and when the cleaning liquid needs to be injected, the nozzle part is forward of the front lens. Protruding cleaning devices have been proposed. An example of such a pop-up type vehicle lamp cleaning device is disclosed in Patent Document 1.

  By the way, in the vehicular lamp cleaning apparatus as described above, if the piston rotates with respect to the cylinder, the position of the injection port of the nozzle portion is deviated, and the sprayed cleaning liquid is reliably supplied to the front lens. Will not reach. Therefore, in the vehicular lamp cleaning apparatus disclosed in Patent Document 1, a plurality of ribs (engagement blades) extending in the axial direction are formed on the outer peripheral surface of the piston, and the ribs are provided in the cylinder. The piston is prevented from rotating around the axis by being guided by the shaft.

JP-A-8-58533

  By the way, when a protrusion such as a rib is provided on the outer peripheral surface of the piston as in the vehicular lamp cleaning device disclosed in Patent Document 1, the seal between the piston and the cylinder is taken. The part of the dust cover, for example, the portion of the dust cover that contacts the outer peripheral surface of the piston becomes complicated, making it difficult to reliably contact the outer peripheral surface of the piston, and the dust prevention between the piston and the cylinder is uncertain. There is a problem of becoming.

  Therefore, an object of the present invention is to prevent the piston from rotating with respect to the cylinder and to improve the dust resistance.

  In order to solve the above-described problems, a cleaning device for a vehicle lamp according to the present invention includes a cylinder to which cleaning liquid is supplied, a piston having a cleaning liquid passage therein and slidably coupled to the cylinder, and a jet of cleaning liquid. A vehicular lamp cleaning device comprising a nozzle portion having an injection port and a check valve portion interposed between the nozzle portion and a piston, the front end portion of the cylinder being provided on an outer peripheral surface of the piston. The outer peripheral surface of the portion of the piston that comes into contact with the cylinder of the piston is in contact with a circular shape other than a perfect circle such as an ellipse or an ellipse when viewed in a cross section perpendicular to the axial direction, or continuous with an angle. It is formed by a flat surface and / or a curved surface.

  Therefore, in the vehicular lamp cleaning apparatus of the present invention, the outer peripheral surface of the piston that contacts the dust cover is formed only by a simple flat surface and / or curved surface.

  The vehicle lamp cleaning device of the present invention includes a cylinder to which cleaning liquid is supplied, a piston having a cleaning liquid passage inside and slidably coupled to the cylinder, and a nozzle portion having an injection port for injecting the cleaning liquid, A vehicular lamp cleaning device comprising a check valve portion interposed between the nozzle portion and a piston, wherein the piston includes a dust cover in contact with an outer peripheral surface of the piston at a tip portion of the cylinder. The outer peripheral surface of the portion that is in sliding contact with the cylinder is formed by a plane and / or curved surface that is continuous with an angle when viewed in a cross section perpendicular to the axial direction.

  Another cleaning device for a vehicle lamp according to the present invention has a cylinder to which cleaning liquid is supplied, a piston having a cleaning liquid passage therein, and slidably coupled to the cylinder, and an injection port for injecting the cleaning liquid. A cleaning device for a vehicle lamp comprising a nozzle portion and a check valve portion interposed between the nozzle portion and the piston, wherein a dust cover that contacts the outer peripheral surface of the piston is provided at a tip portion of the cylinder. And the outer peripheral surface of the portion in sliding contact with the cylinder of the piston is a circle other than a perfect circle such as an ellipse or an ellipse when viewed in a cross section perpendicular to the axial direction.

  Therefore, in the vehicle lamp cleaning device of the present invention and another vehicle lamp cleaning device of the present invention, the piston can be prevented from rotating with respect to the cylinder, and the outer peripheral surface of the piston with which the dust cover comes into contact, Formed only by simple planes and / or curved surfaces, such as circles other than perfect circles such as ellipses and ellipses, or planes and / or curved surfaces that are continuous with an angle to each other when viewed in a cross section perpendicular to the axial direction Therefore, the shape of the part of the dust cover that contacts the outer peripheral surface of the piston is not complicated, the dust cover can easily contact the outer peripheral surface of the piston, and the dust-proof positiveness between the piston and the cylinder is kept good. I can do it.

  Specifically, the outer peripheral surface of the portion in sliding contact with the cylinder of the piston is a regular polygon (Claim 2) and a circle with a part of the arc changed to a plane (Claim 3) when viewed in a cross section perpendicular to the axial direction. , An ellipse, an ellipse, and the like other than a perfect circle.

  Further, it is not always necessary for the dust cover to be in contact with the outer peripheral surface of the piston over the entire stroke of the piston, and the dust cover is at least in a state where the piston is drawn into the cylinder and a state where the piston protrudes from the cylinder. The object of dust prevention can be achieved if it is in contact with the outer peripheral surface of the piston. Of course, if the dust cover is in contact with the outer peripheral surface of the piston over the entire stroke of the piston with respect to the cylinder, there is nothing to say.

  The best mode for carrying out the vehicular lamp cleaning apparatus of the present invention will be described below with reference to the accompanying drawings.

  The vehicular lamp cleaning apparatus 1 includes a cylinder 2, a piston 3 slidably coupled to the cylinder 2, and a nozzle portion 5 connected to the tip of the piston 3 via a check valve portion 4.

  The cylinder 2 includes a main portion 21 having a substantially cylindrical shape and a joint portion 22 that closes the rear end of the main portion 21.

  A plurality of engaging protrusions 21a, 21a,..., 21b, 21b,... (See FIGS. 3 and 4) are spaced in the circumferential direction on the front end portion and the rear end portion of the outer peripheral surface of the main portion 21, respectively. It is formed with a gap. Further, an inner flange 21c (see FIG. 5) protruding inward is formed at the front end of the main portion 21.

  The joint portion 22 has a substantially annular shape, and is formed by integrally forming a fitting portion 221 whose rear end is closed and a connecting pipe 222 connected to the rear end of the fitting portion 221 and projecting sideways. A plurality of engagement holes 221a, 221a,... Are formed at intervals in the circumferential direction in the fitting portion 221, and a spring hooking portion 221b is integrally formed inside the fitting portion 221. (See FIGS. 3 to 5).

  And the fitting part 221 of the joint part 22 is externally fitted by the rear-end part of the main part 21, and the engagement protrusions 21b, 21b, ... formed in the outer peripheral surface of the main part 21 are the joint part 22's. .. Are engaged with the engagement holes 221a, 221a,..., Whereby the joint portion 22 is attached to the rear end portion of the main portion 21. A groove 221c is formed on the inner surface of the rear end of the fitting portion 221 of the joint portion 22 over the entire circumference, and the O-ring 23 is fitted in the back of the groove 221c. The rear end is fitted in the groove 221c (see FIG. 5).

  The piston 3 is slidably coupled to the cylinder 2. The piston 3 is formed in a substantially cylindrical shape, and an engagement groove 31 is formed over the entire outer periphery of the rear end portion, and a flange 32 projects from the front side of the engagement groove 31. The outer diameter of the flange 32 is formed to be substantially the same as the inner diameter of the main portion 21 of the cylinder 2, and the outer peripheral surface of the flange 32 is in sliding contact with the inner peripheral surface of the main portion 21 of the cylinder 2. (See FIG. 5).

  A small-diameter portion 33 having an outer diameter smaller than other portions is formed at the front end portion of the piston 3, and a plurality of engagement protrusions 34, 34,... On the outer peripheral surface of the portion near the rear end of the small-diameter portion 33. Are formed at intervals in the circumferential direction, and an engagement groove 35 is formed on the outer peripheral surface at a position immediately before the engagement protrusions 34, 34,. 5). The shape of the outer peripheral surface of the portion between the immediately after the small-diameter portion 33 of the piston 3 and the flange 32 is a circle other than a perfect circle such as an ellipse or an ellipse when viewed in a cross section perpendicular to the axial direction, or an angle with each other. And has a continuous plane and / or curved surface. For example, it is formed into a circle other than a perfect circle such as a regular polygon, an ellipse, or an ellipse, or a circle obtained by changing a part of a so-called D-cut arc into a plane. In this embodiment, it is formed in a regular hexagon (see FIG. 8). Note that the shape of the inner peripheral surface of the inner flange 21c formed at the front end of the cylinder 2 is adapted to the shape of the outer peripheral surface of the piston 3, thereby rotating the piston 3 in the direction around the axis. Is prevented. In this embodiment, the shape of the inner peripheral surface of the inner flange 21c of the cylinder 2 is a regular hexagon (see FIG. 8).

  Furthermore, a spring hooking bar 36 is formed at the front end of the piston 3 so as to bridge between the inner peripheral surfaces (see FIG. 5).

  Then, a seal body 37 formed in an annular shape by an elastic material is fitted into the engagement groove 31 formed at the rear end portion of the piston 3, and the engagement groove 35 formed in the small diameter portion 33 at the front end portion is opened to the engagement groove 35. The ring 38 is fitted. The cross-sectional shape of the seal body 37 is in a horizontally inverted V shape, and the flange portion 37a located on the outside is located slightly outside the flange 32 of the piston 3 (see FIG. 5). As a result, the flange portion 37a is in sliding contact with the inner peripheral surface of the main portion 21 of the cylinder 2 in close contact.

  The piston 3 is inserted into the main portion 21 of the cylinder 2 from the rear end thereof, and then the rear end of the main portion 21 of the cylinder 2 is closed by the joint portion 22. The tension spring 24 is stretched between the spring hooking portion 221b of the cylinder 2 and the spring hooking bar 36 of the piston 3. As a result, the piston 3 is coupled to the cylinder 2 so as to be slidable in the axial direction, and is held in a state of being pulled into the cylinder 2 by the tension spring 24 (see FIG. 5). Thus, by arranging the tension spring 24 inside the piston 3, the radial and axial sizes of the cylinder 2 can be made small. When the piston 3 is retracted into the cylinder 2, the front end side portion of the piston 3 slightly protrudes from the small diameter portion 33 of the piston 3 to the front end side, and the front end of the main portion 21 of the cylinder 2. The dust cover 25 fixed to the surface comes into contact with the outer peripheral surface of the piston 3 (see FIG. 5). The dust cover 25 is formed of a rubber-like elastic material in a substantially annular shape, and the shape of the inner peripheral portion is a shape corresponding to the shape of the outer peripheral surface of the piston 3, that is, an ellipse when viewed in a cross section perpendicular to the axial direction. It is formed by a circle other than a perfect circle such as a circle or an ellipse, or a plane and / or curved surface that is continuous with an angle.

  A check valve portion 4 and a nozzle portion 5 are connected to the front end portion of the piston 3.

  The check valve 4 is formed by a case body 41, a lid body 42, a valve body 43, a spring 44 and a plate 45.

  As can be seen from FIGS. 9 and 10, the case body 41 is substantially flat, that is, has a cylindrical shape with a short axial length, and is connected to the main portion 411 serving as a valve arrangement portion and the front and rear of the main portion 411. The substantially cylindrical connecting portions 412 and 413 are integrally formed. The main part 411 is formed so that the axial direction extends in the vertical direction, and is divided into two parts up and down by the partition wall 411a, that is, a valve body housing recess 411b and a pressure forming part 411c. The pressure forming portion 411c is separated from a portion communicating with the connecting portion 413 by a semicircular partition 411d as viewed from above, and communicates with the connecting portion 412. The partition wall 411a is formed with a circular communication hole 411e located inside the partition wall 411d forming position, and the pressure forming portion 411c and the valve body housing recess 411b are communicated with each other through the communication hole 411e. The partition wall 411a is formed with an arc-shaped outflow hole 411f located outside the partition wall 411d, and the valve body housing recess 411b and the connection portion 413 communicate with each other through the outflow hole 411f. The inner side 412a of the connecting part 412 serves as a cleaning liquid inflow part and communicates with the pressure forming part 411c, and the inner side 413a of the connecting part 413 serves as a cleaning liquid outflow part and passes through the outflow hole 411f. It communicates with the storage recess 411b.

  Two engaging holes 412b and 412b are formed at equal intervals in the circumferential direction at the end of the connecting portion 412 on the base side of the case body 41. Further, a regulated projection is formed from the side surface on the distal end side of the connecting portion 412. 412c and 412c protrude (refer FIG. 7, FIG. 10).

  The connecting portion 413 on the distal end side is formed with connecting portions 413b and 413b protruding left and right, and the cleaning liquid outflow portion 413a communicates with the connecting portions 413b and 413b. And the engagement protrusion 413c, 413c extended cyclically | annularly is formed in the outer peripheral surface of the said connection part 413b, 413b.

  As can be seen from FIGS. 11 to 13, the valve body 43 is formed of, for example, a rubber-like elastic material such as synthetic rubber, and has a substantially disk shape. A convex portion 431 protruding in a dome shape is integrally formed at the central portion of the valve body 43, and a step-like convex portion 432 is formed at a position corresponding to substantially the back side of the convex portion 431. And the plate 45 is provided so that the said step-like convex part 432 and its peripheral part may be covered. The plate 45 is formed by molding a material having higher rigidity than the material of the valve body 43, for example, a metal plate by pressing or the like, and the valve body 43 and the plate 45 are integrated by insert molding or the like when the valve body 43 is formed. ing.

  In particular, as can be clearly seen in FIG. 11, the spring 44 is formed of a leaf spring material, has a circular outer shape, and arc-shaped slits 441 and 441 are formed in a labyrinth from the peripheral portion to the central portion. A circular hole 442 having a size for fitting the projection 451 at the center of the plate 45 is formed.

  The lid body 42 covers the valve body housing recess 411b, has a plurality of air holes 421, 421,..., And has a convex wall 422 extending in an annular shape on the outer periphery.

  The valve body 43 and the spring 44 are inserted in this order into the valve body housing recess 411b. At this time, the convex portion 431 of the valve body 43 protrudes from the communication hole 411 e toward the pressure forming portion 411 c, and the projection 451 of the plate 45 is fitted in the circular hole 442 of the spring 44. Then, the lid body 42 is attached to the case body 41. When the lid body 42 is attached to the case body 41, the valve body housing recess 411b communicates with the outside air only by the air holes 421, 421,..., And the peripheral portions of the valve body 43 and the spring 44 are the lid body 42. The convex wall 422 and the partition wall 411a of the case body 41 are sandwiched and fixed in position. The spring force of the spring 44 acts to urge the central portion of the valve body 43 in the direction of the pressure forming portion 411c via the plate 45, thereby closing the communication hole 411e and the outflow hole 411f. In addition, since the plate 45 having higher rigidity than the valve body 43 is interposed between the spring 44 and the valve body 43, the force of the spring 44 is transmitted to the valve body 43 without waste, and the communication hole 411e and the outflow hole 411f are surely provided. Obstructed.

  As described above, the valve body 43 is arranged so that its radial direction is along the sliding direction of the piston 3, so that the sliding direction of the piston 3 is substantially in the front-rear direction and the diameter of the valve body 43. If the check valve unit 4 is arranged so that the direction is substantially horizontal, the vertical size of the check valve unit 4 can be reduced, and the outer diameter of the piston 3, and hence the check valve unit is not provided in the piston 3. The outer diameter of the cylinder 2 receiving the piston 3 can be reduced, whereby the vertical size of the entire apparatus can be reduced, and the vertical and horizontal directions can be reduced along the periphery of the vehicular lamp. Can be placed in a small space.

  In the check valve portion 4 described above, the base side connecting portion 412 is externally fitted to the small diameter portion 33 at the distal end portion of the piston 3, and the engaging protrusions 34, 34,. Are engaged with the engagement holes 412b, 412b,. As a result, the check valve portion 4 is attached to the tip portion of the piston 3.

  In the present embodiment, two, five, and five nozzle portions are provided. Each nozzle unit 5 includes a nozzle body 51 and a nozzle holder 52 that holds the nozzle body 51.

  As can be seen in FIG. 14, the nozzle body 51 has a cylindrical shape with the upper end closed, and has an injection port 511 that opens at the side of the upper end. An engagement groove 512 extending in an annular shape is formed on the inner peripheral surface of the lower end. The nozzle holder 52 includes an annular connection portion 521 and a cylindrical support portion 522, and the connection portion 521 and the support portion 522 are orthogonal to each other and communicate with each other. An engagement groove 521 a that extends in an annular shape is formed on the inner peripheral surface of the connecting portion 521, and an engagement protrusion 522 a that extends in an annular shape is formed on the outer peripheral surface of the support portion 522.

  The nozzle body 51 is externally fitted to the support portion 522 of the nozzle holder 52, and the engagement groove 512 of the nozzle body 51 and the engagement protrusion 522 a of the support portion 522 of the nozzle holder 52 are engaged with each other. Is prevented from falling off from the nozzle holder 52. In this way, the nozzle portion 5 is formed. Since the engagement groove of the nozzle body 51 and the engagement protrusion 522a of the support portion 522 of the nozzle holder 52 are formed in an annular shape, the nozzle body 51 can be rotated around the axis of the support portion 522.

  In the nozzle body 5 formed as described above, the connecting portion 521 of the nozzle holder 52 is fitted on the connecting portion 413b formed on the connecting portion 413 of the check valve portion 4, and the engaging groove 521a of the nozzle holder 52 is formed. The check valve portion 4 engages with the engagement protrusion 413c of the coupling portion 413b. In this way, the nozzle body 5 is supported by the tip of the check valve 4 and is prevented from falling off. Further, since the engagement groove 521a of the nozzle holder 52 and the engagement protrusion 413c of the coupling portion 413b of the check valve portion 4 are formed in an annular shape, the nozzle body 5 can be rotated around the axis of the coupling portion 413b. it can.

  As described above, the direction of the ejection port 511 is adjusted to a desired direction by the rotation of the nozzle holder 52 with respect to the coupling portion 413b of the check valve portion 4 and the rotation of the nozzle body 51 with respect to the support portion 522 of the nozzle holder 52. Can do.

  The cylinder 2 described above is attached to the vehicle body via the bracket 6.

  As can be seen from FIGS. 5 and 6, the bracket 6 includes a cylindrical support tube 61 having a short axial length, a support piece 62 formed to extend left and right above the support tube 61, and a support tube. The positioning piece 63 projecting rearward and obliquely upward from 61 and the support piece 62 and the restricting portion 64 projecting forward from the lower end of the support cylinder 61 are integrally formed.

  A plurality of engagement holes 611, 611,... Are formed in the support cylinder 61 at intervals in the circumferential direction. In addition, support holes 621 and 621 are formed at both left and right ends of the support piece 62. Further, an engagement piece 631 is projected from the rear end of the positioning piece 63.

  The restriction portion 64 is formed by integrally forming a restriction piece 641 protruding forward from the lower end of the support cylinder 61 and a restriction arm 642 protruding upward from the front end of the restriction piece 641, and the restriction arm 642 is viewed from the front. In the upper end portion thereof, restricting grooves 642a and 642a located opposite to each other are formed (see FIG. 7).

  In the standby state in which the piston 3 is drawn into the cylinder 2, the restricting piece 641 is positioned close to the lower surface of the base side connecting portion 412 of the check valve portion 4, and the regulated protrusions 412 c and 412 c of the connecting portion 412. Is located in the restriction grooves 642a and 642a (see FIG. 7), and the position of the tip of the piston 3 is restricted by the restriction part 64 of the bracket 6.

  The front end portion of the cylinder 2 is fitted into the support cylinder 61 of the bracket 6, and the engagement protrusions 21 a, 21 a,... Of the cylinder 2 are engaged with the engagement holes 611, 611,. Accordingly, the cylinder 2 is supported by the bracket 6. Then, the engaging piece 631 of the positioning piece 63 of the bracket 6 is positioned by being engaged with a positioning portion (not shown) formed on the vehicle body, and a bolt (not shown) inserted into the support holes 621 and 621 of the support piece 62 is inserted. The cylinder 2 is supported by the vehicle body by being fixed to a mounting portion (not shown) formed on the vehicle body by a nut (not shown).

  A cover 7 that covers the nozzle portion 5 with respect to the front is fixed to the front end of the check valve portion 4.

  The vehicular lamp cleaning device 1 can be disposed between a vehicular lamp, for example, a bumper 9 just below the headlamp 8. Reference numeral 81 denotes a front lens that forms the front surface of the headlamp 8, and the front lens 81 is surrounded by a cosmetic rim 82. The cover 7 is configured to form a part of the rim 82. That is, in the standby position shown in FIGS. 1 to 3, the cover 7 is positioned so as to form a part of the rim 82. Accordingly, in appearance, the cleaning device 1 is integrated with the headlamp, and the appearance of the vehicle equipped with the cleaning device 1 is improved. Only when the front lens 81 needs to be cleaned, the piston 3 protrudes from the cylinder 2 so that the nozzles 511 and 511 of the nozzle bodies 51 and 51 are located in front of the front lens 81 as shown in FIG. .

  Next, the operation of the vehicle lamp cleaning device will be described.

  In the standby state in which the piston 3 is drawn into the cylinder 2, that is, in the state shown in FIGS. 3, 5, and 6, the cleaning liquid is supplied to the cylinder 2 through a cleaning liquid supply pipe (not shown) connected to the connecting pipe 222 of the cylinder 2. When supplied to the inside, the space between the rear end of the piston 3 and the inner peripheral surface of the cylinder 2 is held in a watertight manner by a seal body 37 that is fitted and fixed to the rear end of the piston 2. 3 reaches the pressure forming part 411c of the check valve part 4 through the inside 3a. That is, the inside 3a of the piston 3 becomes a cleaning liquid passage.

  When the cleaning liquid passage 3 a is filled with the cleaning liquid, the pressure of the cleaning liquid in the cleaning liquid path 3 a increases, but the spring force of the spring 44 of the check valve portion 4 is stretched between the cylinder 2 and the piston 3. Since it is made larger than the spring force of the spring 24, the tension spring 24 starts to expand by the pressure of the cleaning liquid. Then, the piston 3 protrudes from the cylinder 2 by the extension of the tension spring 24.

  When the flange 32 of the piston 3 contacts the inner flange 21c of the cylinder 2, the protrusion of the piston 3 from the cylinder 2 stops. When the movement of the piston 3 protruding from the cylinder 2 is stopped, the pressure of the cleaning liquid in the piston 3 and the cylinder 2 further increases, and the dome-shaped protrusion of the valve body 43 is formed in the pressure forming portion 411c of the check valve portion 4. The pressure applied to the surface of the part 431 and the like increases. When the pressure applied to the valve body 43 rises, the pressure eventually overcomes the spring force of the spring 44, the spring 44 and the valve body 43 bend toward the air holes 421, 421,..., The communication hole 411e and the outflow hole. 411f is opened (see FIG. 13). Accordingly, the cleaning liquid flow path of the cleaning liquid inflow portion 412a, the pressure forming portion 411c, the communication hole 411e, the valve body housing recess 411b (the pressure forming portion 411c side from the valve body 43), the outflow hole 411f, and the cleaning liquid outflow portion 413a is opened. The cleaning liquid further reaches the nozzle portions 5 and 5 through the coupling portions 413b and 413b.

  In addition, since air holes 421, 421,... Are formed in the lid body 42 that closes the valve body housing recess 411b, the valve body 43 to the lid body 42 regardless of the behavior of the valve body 43. Therefore, the opening and closing operation of the valve body 43 accompanying the change of the cleaning liquid pressure in the pressure forming portion 411c is smoothly performed.

  In the state of use shown in FIG. 4 and the like, the piston 3 protrudes most from the cylinder 2, but the piston 3 includes a portion where the outer peripheral surface of the flange 32 and the inner peripheral surface of the cylinder 2 are in contact with each other, and the piston 3. Since the outer peripheral surface is supported by the cylinder 2 at two positions where the outer peripheral surface contacts the inner peripheral surface of the inner flange 21c of the cylinder 2, the support state of the piston 3 is stabilized. Further, even if the piston 3 may be slid downward due to some momentum, the restriction piece 641 formed on the bracket 6 is close from the bottom near the base of the piston 3 (see FIG. 7). 3 is prevented by the restriction piece 641.

  The cleaning liquid that has reached the nozzle portions 5 and 5 further flows from the nozzle holders 52 and 52 into the nozzle bodies 51 and 51, and is finally ejected from the ejection ports 511 and 511 toward the front lens 81 of the headlamp 8. The

  When the supply of the cleaning liquid is stopped, the cleaning liquid pressure in the pressure forming section 411c of the check valve section 4 is reduced, so that the spring force of the spring 44 is superior to the cleaning liquid pressure in the pressure forming section 411c. The communication hole 411e and the outflow hole 411f are closed (see FIG. 12). Thereby, the supply of the cleaning liquid to the nozzle portions 5 and 5 is stopped, and the injection of the cleaning liquid from the injection ports 511 and 511 is stopped. Note that cleaning liquid remains between the outflow hole 411f of the check valve unit 4 and the injection ports 511 and 511, and the remaining cleaning liquid may leak from the injection ports 511 and 511. Since the distances to 511 and 511 are short, the amount of the cleaning liquid remaining in the portion is extremely small, and leakage of the residual cleaning liquid is hardly a problem.

  Further, when the pressure of the cleaning liquid inside the piston 3 and the cylinder 2 decreases, the spring force of the tension spring 24 is greater than the pressure of the cleaning liquid, and the piston 3 is drawn into the cylinder 2 by the tension spring 24. Finally, the standby state shown in FIGS. In any of the standby state, the use state, and the state between these two states, the inner peripheral portion of the dust cover 25 provided at the front end portion of the cylinder 2 is in close contact with the outer peripheral surface of the piston 3. Therefore, dust or the like is prevented from entering between the cylinder 2 and the piston 3 from between the front end portion of the cylinder 2 and the outer peripheral surface of the piston 3. In addition, since the shape of the outer peripheral surface of the piston 3 is a regular polygon, it is easy to manufacture, and when it is an ellipse or an ellipse, there is no corner (ridge line). Adhesion is improved.

  It should be noted that the shapes and structures of the respective parts shown in the above-described embodiments are merely examples of implementations in carrying out the present invention, and these limit the technical scope of the present invention. It should not be interpreted.

  It is possible to provide a vehicle lamp cleaning device that is small in size and has a high degree of freedom in arrangement space, and is suitable for use in vehicles that cannot secure a wide arrangement space due to design requirements.

FIGS. 2 to 4 are views showing a state in which the vehicle lamp cleaning device of the present invention is incorporated in a vehicle body together with a headlamp, and this figure is a front view in a standby state. It is a top view in a standby state. It is a side view in a standby state. It is a side view in use condition. It is a longitudinal cross-sectional view which shows the whole washing | cleaning apparatus of the vehicle lamp. It is a top view which shows the whole washing | cleaning apparatus of the vehicle lamp. It is an expanded sectional view which follows the VII-VII line of FIG. It is an expanded sectional view which follows the VIII-VIII line of FIG. The check valve portion is shown together with FIGS. 10 to 13, and this figure is a longitudinal sectional view of the case body. It is a bottom view of a case body. It is a disassembled perspective view. It is a longitudinal cross-sectional view which shows the obstruction | occlusion state. It is a longitudinal cross-sectional view which shows an operation state. It is an enlarged vertical sectional view of a nozzle part.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Cleaning device for vehicle lamps, 2 ... Cylinder, 25 ... Dust cover, 3 ... Piston, 3a ... Inside (cleaning liquid passage), 4 ... Check valve part, 5 ... Nozzle part, 511 ... Injection port

Claims (5)

A cylinder to which cleaning liquid is supplied, a piston having a cleaning liquid passage inside, and a piston slidably coupled to the cylinder, a nozzle portion having an ejection port for injecting the cleaning liquid, and an interposition between the nozzle portion and the piston A vehicular lamp cleaning device comprising a check valve portion,
A dust cover that contacts the outer peripheral surface of the piston at the tip of the cylinder;
An outer peripheral surface of a portion of the piston in sliding contact with the cylinder is formed by a plane and / or a curved surface which are continuous with an angle when viewed in a cross section perpendicular to the axial direction. apparatus. The apparatus for cleaning a vehicular lamp according to claim 1, wherein an outer peripheral surface of a portion of the piston in sliding contact with the cylinder is a regular polygon as viewed in a cross section perpendicular to the axial direction. 2. The vehicular lamp cleaning device according to claim 1, wherein an outer peripheral surface of a portion in sliding contact with the cylinder of the piston is a circular shape in which a part of an arc is changed to a plane when viewed in a cross section perpendicular to the axial direction. . A cylinder to which cleaning liquid is supplied, a piston having a cleaning liquid passage inside, and a piston slidably coupled to the cylinder, a nozzle portion having an ejection port for injecting the cleaning liquid, and an interposition between the nozzle portion and the piston A vehicular lamp cleaning device comprising a check valve portion,
A dust cover that contacts the outer peripheral surface of the piston at the tip of the cylinder;
An apparatus for cleaning a vehicular lamp, wherein an outer peripheral surface of a portion in sliding contact with a cylinder of the piston is a circle other than a perfect circle such as an ellipse or an ellipse when viewed in a cross section perpendicular to the axial direction. The dust cover is in contact with the outer peripheral surface of the piston at least when the piston is retracted into the cylinder and when the piston protrudes from the cylinder. The cleaning device for a vehicle lamp according to claim 3 or claim 4.

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