JP6565896B2 - Electric parking brake device - Google Patents

Description

  The present invention relates to an electric parking brake device.

  Conventionally, an electric motor, a driving mechanism that drives the parking brake by the driving force of the electric motor, a releasing member that drives the driving mechanism by the driving force of manual operation, and changes the parking brake from the braking state to the releasing state, and the releasing There is known an electric parking brake device including a housing member that houses a member and communicates the inside and outside of a housing of a drive mechanism (for example, Patent Document 1).

JP 2008-018898 A

  In this type of electric parking brake device, for example, a waterproof filter having a ventilation function is arranged in the housing member so as to ventilate the inside and outside of the housing. At this time, in particular, when the release member is disposed outside the passenger compartment, for example, for the purpose of preventing the waterproof filter from being damaged or protecting the drive mechanism, entry of foreign matters such as water into the housing member is more easily suppressed. A configuration is required. One of the objects of the present invention is to obtain an electric parking brake device with a less inconvenience, for example, having a new configuration relating to a housing member.

  The electric parking brake device of the present invention is, for example, an electric motor, driven by the electric motor, and the state of the parking brake, the braking state in which the parking brake brakes the wheels of the vehicle, and the braking of the wheels by the parking brake. A mechanism that changes to a released state, a housing that houses the mechanism, and an operation unit that is located outside the housing and receives a manual operation. A drive member that is driven by the driving force input to the drive unit to drive the mechanism unit to change the parking brake state from the braked state to the released state; And a first opening end that opens to the end surface and exposes the operation portion, and is provided with the housing through the first opening end. A housing member that communicates between the outside of the housing and the inside of the housing; and a cover that covers the end surface and the first opening end and is detachably attached to the housing member and that forms an assembly together with the housing member. A non-linear air passage is provided between the housing member and the cover, and the air passage is provided from the second opening end provided in the assembly and opened to the outside of the assembly. The first opening end and the second opening end are in communication with each other.

  In the electric parking brake device, for example, a cover that covers the first opening end and is detachably attached to the housing member is provided, so that the cover is attached to the first opening end by the cover. The entry of foreign matter such as water is suppressed. Further, when the operation unit is operated, the operation unit is exposed by removing the cover, so that it is not difficult to operate the operation unit with the cover. Therefore, according to the electric parking brake device, for example, it is possible to suppress entry of foreign matter into the first opening end portion while suppressing deterioration in operability of the operation portion. Further, the housing can be ventilated through the first opening end portion by a relatively simple structure in which an air passage is provided between the housing member and the cover. In addition, for example, since the air passage is non-linear, it is easy to suppress the arrival of foreign matter through the air passage to the first opening end as compared with the straight passage. In addition, for example, the first part of the air passage is directed upward in the vertical direction of the vehicle from the second opening end, so that the foreign matter that has entered the first part is easily discharged by gravity.

  In the electric parking brake device, for example, the first opening end portion faces downward in the vertical direction.

  According to the electric parking brake device, for example, since the first opening end faces downward in the vertical direction, even if a foreign object reaches the first opening end through the air passage, the foreign object is It is easy to be suppressed from entering the back side of one opening end.

  In the electric parking brake device, for example, the air passage includes a plurality of the first portions and a second portion that communicates each of the plurality of first portions with the first opening end.

  According to the electric parking brake device, for example, since the air passage has a plurality of first portions, foreign matter that has entered the air passage can be discharged from the second opening end portions of the plurality of first portions. Emissions are high. In addition, for example, foreign matter that has entered a certain first portion can be discharged from another first portion, so that the foreign matter is highly discharged.

  In the electric parking brake device, for example, a plurality of the air passages are provided.

  According to the electric parking brake device, for example, since a plurality of air passages are provided, even if a certain air passage is blocked, the housing can be ventilated by another air passage.

  In the electric parking brake device, for example, an upper air passage and a lower air passage are provided as the two air passages, and the second opening end portion of the upper air passage is the first air passage of the lower air passage. It is located above the up-down direction from the two opening ends.

  According to the electric parking brake device, for example, the second opening end portion of the upper air passage is located above the second opening end portion of the lower air passage in the vertical direction. Even when the second opening end portion is submerged, the housing can be ventilated if the second opening end portion and the first opening end portion of the upper air passage are on the water surface.

  In the electric parking brake device, for example, the housing member includes a fixing member that has the end surface and is fixed to the mounting portion of the vehicle, and the air passage includes a groove portion that is recessed from the end surface.

  According to the electric parking brake device, for example, since the air passage includes a groove portion that is recessed from the end surface of the housing member, the cover is provided when the cross-sectional area of the air passage is a predetermined area in order to ensure a predetermined air flow amount. It is not necessary to provide a groove portion in the cover, or even when a groove portion constituting an air passage is provided in the cover, the size (depth, etc.) of the groove portion can be reduced. Therefore, it is easy to reduce the thickness of the cover.

  In the electric parking brake device, for example, the peripheral edge of the cover protrudes from the peripheral edge of the end surface.

  According to the electric parking brake device, for example, since the peripheral portion of the cover protrudes from the peripheral portion of the end surface, entry of foreign matter to the second opening end portion of the air passage is easily suppressed by the peripheral portion of the cover. .

FIG. 1 is an exemplary and schematic configuration diagram of a vehicle including the electric parking brake device of the embodiment. FIG. 2 is an exemplary schematic cross-sectional view of a part of the release portion of the electric parking brake device according to the embodiment. 3 is a view taken in the direction of arrow III in FIG. FIG. 4 is an exemplary and schematic perspective view of the distal end portion of the release portion of the electric parking brake device of the embodiment. FIG. 5 is an exemplary schematic perspective view of the distal end portion of the release portion of the electric parking brake device of the embodiment, and is a view in a state where the cover is removed. FIG. 6 is an exemplary schematic cross-sectional view of a cap and a seal ring of the electric parking brake device according to the embodiment. FIG. 7 is an exemplary schematic plan view of the cap of the electric parking brake device according to the embodiment.

  Hereinafter, exemplary embodiments of the present invention are disclosed. The configuration of the embodiment shown below, and the operation and result (effect) brought about by the configuration are examples. The present invention can be realized by configurations other than those disclosed in the following embodiments. According to the present invention, it is possible to obtain at least one of various effects (including derivative effects) obtained by the configuration.

  Moreover, in this specification, the ordinal number is given for convenience in order to distinguish parts, parts, and the like, and does not indicate priority or order.

  As shown in FIG. 1, the electric parking brake device 2 is provided in the vehicle 1. The electric parking brake device 2 includes a drive mechanism 3 and a release unit 4. The release unit 4 is also referred to as an emergency release mechanism.

  The drive mechanism 3 is driven by the electric motor 11 and changes the state of the parking brakes 13 and 15 between a braking state and a release state. The braking state is a state in which the parking brakes 13 and 15 brake the wheels of the vehicle 1 (left rear wheel LRW, right rear wheel RRW), and the released state is a wheel by the parking brakes 13 and 15 (left rear wheel LRW, right rear wheel). This is a state in which braking of the rear wheel RRW) is released.

  The drive mechanism 3 includes a mechanism unit 20, a housing 21, a pair of cables 17 and 19, and an electric control device 10.

  The mechanism part 20 has the speed reduction mechanism 5, the conversion mechanism 6, and the distribution mechanism 7, and changes the state of the parking brakes 13 and 15 into a braking state and a release state. The mechanism unit 20 is accommodated in a housing 21 having a sealed structure. The inside of the housing 21 is divided into two (plural) chambers by a partition wall 23, and each part of the mechanism unit 20 is distributed and accommodated in these chambers. The housing 21 is assembled on the upper surface of the frame that supports the wheels (the left rear wheel LRW and the right rear wheel RRW), for example, below the trunk provided at the rear portion of the vehicle 1.

  The deceleration mechanism 5 decelerates and transmits the rotational driving force that is the output of the electric motor 11. The conversion mechanism 6 converts the rotational driving force of the electric motor 11 transmitted through the speed reduction mechanism 5 into a linear driving force. The distribution mechanism 7 is driven by the linear driving force converted by the conversion mechanism 6 and distributes the linear driving force to the two output units. The pair of cables 17 and 19 are connected to the output portions of the distribution mechanism 7 and transmit a linear driving force to the parking brakes 13 and 15. The electric control device 10 controls forward / reverse rotation driving of the electric motor 11.

  The electric motor 11 is assembled to the housing 21 together with the speed reduction mechanism 5. The electric motor 11 is electrically connected to the electric control device 10, and the operation is controlled by the electric control device 10. When the driver operates the brake switch SW1, the electric motor 11 is rotationally driven in the forward direction, and when the driver operates the release switch SW2, the electric motor 11 is rotationally driven in the reverse direction. .

  The reduction mechanism 5 is configured by a reduction gear train (the number of gear trains can be set as appropriate). The speed reduction mechanism 5 has a plurality of gears including an input gear 25 and an output gear 27. The plurality of gears are accommodated in a room provided in the housing 21. The input gear 25 is fixed to the output shaft 11 a of the electric motor 11. The output gear 27 is fixed to one end of the screw shaft 29.

  The conversion mechanism 6 includes a screw shaft 29, a nut 31, and an equalizer 33. The nut 31 is screwed (coupled) to the screw shaft 29. The equalizer 33 moves integrally with the nut 31 in the axial direction of the screw shaft 29 in a state where the rotation of the nut 31 around the screw shaft 29 is restricted. In the conversion mechanism 6, when the screw shaft 29 is rotationally driven in the forward direction, the nut 31 and the equalizer 33 are moved from the release position (position in FIG. 1) to the braking position (position a predetermined amount to the right of the position in FIG. 1). Is moved in the axial direction of the screw shaft 29. For this reason, the inner wires 17a and 19a of both the cables 17 and 19 are pulled, and both the parking brakes 13 and 15 are brought into a braking state. Further, when the screw shaft 29 is rotationally driven in the reverse direction, the nut 31 and the equalizer 33 are moved in the axial direction of the screw shaft 29 from the braking position toward the release position. For this reason, the inner wires 17a and 19a of both cables 17 and 19 are loosened, and both parking brakes 13 and 15 are released.

  The parking brake 13 is incorporated in a wheel brake (not shown) that is mounted to brake the left rear wheel LRW. The parking brake 15 is incorporated in a wheel brake (not shown) that is mounted to brake the right rear wheel RRW. The parking brake 13 is also referred to as a brake body or a braking unit.

  The distribution mechanism 7 distributes the linear driving force acting on the nut 31 equally to the two output portions. The distribution mechanism 7 includes an equalizer 33. The equalizer 33 is supported at the central portion 33 a so as to be swingable on the nut 31 via the connecting pin 35, and can move in the axial direction of the screw shaft 29 together with the nut 31. The equalizer 33 is coupled to the inner wires 17a and 19a of the cables 17 and 19 by a pair of arm portions 33b and 33c (output portions) extending from the central portion 33a toward the outer diameter of the screw shaft 29. Yes.

  The screw shaft 29 has a male screw on the outer periphery, and is assembled to the housing 21 via a pair of bearings 37 and 39 so as to be rotatable and immovable in the axial direction. Further, the screw shaft 29 is rotationally driven in the forward or reverse direction by the electric motor 11 via the speed reduction mechanism 5 in a state where movement in the axial direction is restricted by the bearings 37 and 39. Yes. The nut 31 has a female screw on the inner periphery, and is screwed to the male screw of the screw shaft 29 with this female screw.

  The equalizer 33 has both upper and lower walls and a vertical wall (a through hole for allowing the screw shaft 29 to pass therethrough) connected to these walls, and is bent in a U-shaped cross section. The equalizer 33 is slidably engaged with the guide plane 21a of the housing 21 (the upper surface of the bottom wall of the housing 21 shown in FIG. 1) on its lower surface. The equalizer 33 is swingably supported on both upper and lower surfaces of the nut 31 by upper and lower walls of the central portion 33a.

  Further, the equalizer 33 is rotated at one arm portion 33b which is one output portion via one end portion of the inner wire 17a and the end pin 41 (preliminarily fixed to one end portion of the inner wire 17a) in one cable 17. It is linked movably. In addition, the equalizer 33 is rotatably connected to one end portion of the inner wire 19a in the other cable 19 via the tension sensor TS and the rod 43 at the arm portion 33c which is the other output portion.

  One cable 17 includes an inner wire 17a and an outer tube 17b that covers and guides the outer periphery of the inner wire 17a other than both ends. The other end portion of the inner wire 17a is connected to the operating portion of one parking brake 13. The other cable 19 includes an inner wire 19a and an outer tube 19b that covers and guides the outer periphery of the inner wire 19a other than both ends. The other end of the inner wire 19a is connected to the operating portion of the other parking brake 15.

  The tension sensor TS is interposed together with the rod 43 at a connection portion between the inner wire 19a of the other cable 19 and the arm portion 33c which is the other output portion of the equalizer 33. The tension sensor TS detects the tension of the inner wire 19 a in the other cable 19. A detection signal (tension detection value) of the tension sensor TS is input to the electric control device 10.

  The electric control device 10 is configured separately from the drive mechanism 3 and is provided in the engine room. The electric control device 10 is electrically connected to the electric motor 11 of the drive mechanism 3 and the tension sensor TS, and is electrically connected to a brake switch SW1 and a release switch SW2 disposed in the vicinity of the driver's seat. Yes. The electric control device 10 may be provided integrally with the drive mechanism 3.

  The release unit 4 does not use the driving force of the electric motor 11 but drives the mechanism unit 20 of the drive mechanism 3 by the input driving force of the manual operation, so that the parking brakes 13 and 15 in the braking state are released. It can be changed. For example, the parking brakes 13 and 15 can be released by the release unit 4 without using the electric motor 11 even when the electric motor 11 is abnormal or the battery has run out.

  As shown in FIGS. 1 and 2, the release unit 4 includes a release member 51, a storage member 53, a cap 55, and a cover 59. The release member 51 can rotationally drive the output gear 27 that is a driven member in the drive mechanism 3. The accommodation member 53 accommodates the release member 51 in a rotatable manner. The cap 55 is assembled inside the end portion of the housing member 53. The cover 59 is detachably attached to the end of the housing member 53. The release member 51 is also referred to as a power transmission member, and the housing member 53 is also referred to as an outer cylinder.

  The release member 51 includes a rotation shaft 51a, an operation unit 51b, and an output gear 51c. The output gear 51 c is accommodated in the housing 21 and meshes with the output gear 27. One end of the rotating shaft 51 a is fixed to the output gear 27 and extends to the outside of the housing 21. The rotating shaft 51a can rotate and bend. The operation part 51b is fixed to the other end of the rotating shaft 51a. The operation part 51b is located outside the housing 21 and receives a manual operation. For example, the operation unit 51 b is located outside the body of the vehicle 1. A tool can be attached to and removed from the operation unit 51b. For example, the operation unit 51b is formed with a hexagonal hole and can be manually rotated using a tool inserted into the hexagonal hole. In the release member 51 configured as described above, the rotary shaft 51a and the output gear 51c can be rotated by rotating the operation unit 51b with a tool, and the output gear 27 is rotated by the rotation of the output gear 51c. It is possible. That is, the release member 51 is connected to the mechanism unit 20 and drives the mechanism unit 20 by the driving force input to the operation unit 51b to change the state of the parking brakes 13 and 15 from the braking state to the release state. Is possible. The operation unit 51b is also referred to as a hexagon socket head.

  As shown in FIG. 2, the housing member 53 houses at least the operation portion 51 b of the release member 51. Specifically, the housing member 53 houses the operation portion 51b and the rotating shaft 51a. As shown in FIG. 1, the housing member 53 is positioned outside the housing 21, and one end of the housing member 53 is assembled to the housing 21 in an airtight and liquid tight manner. 2-5, the end surface 53c is provided in the edge part on the opposite side to the housing 21 of the accommodating member 53. As shown in FIG. The accommodating member 53 is provided with an accommodating chamber 53 a that accommodates the release member 51. The storage chamber 53a is provided across the end surface 53c and the end surface of the storage member 53 on the housing 21 side. The storage chamber 53 a is provided over the entire length of the storage member 53. One end of the storage chamber 53 a is open and communicates with the inside of the housing 21. Further, the first opening end portion 53b, which is the other end portion of the storage chamber 53a, opens to the end surface 53c. The first opening end portion 53 b opens obliquely downward in the vertical direction of the vehicle 1. That is, the first opening end portion 53b faces downward D. Further, the first opening end portion 53b exposes the operation portion 51b of the release member 51. The housing member 53 having such a configuration communicates the outside of the housing 21 with the inside of the housing 21 via the first opening end portion 53b (the housing chamber 53a).

  The housing member 53 is configured as a combination of a plurality of members, specifically, a cylindrical member 61 and a fixing member 63. The storage chamber 53 a is provided across the cylindrical member 61 and the fixing member 63. The tubular member 61 can be bent and is assembled to the housing 21.

  As shown in FIG. 2, the fixing member 63 is assembled (fixed) in an airtight and liquid-tight manner to the end of the cylindrical member 61 on the side opposite to the housing 21. The fixing member 63 has a liquid-tight sealing structure by assembling the cap 55.

  Further, the fixing member 63 is fixed to the mounting portion 67 of the vehicle 1 by, for example, the couplers 68 and 69. The coupler 68 is, for example, a stat bolt, and the coupler 69 is, for example, a nut. Further, the fixing member 63 is integrally provided with a pin P <b> 1 engaged with the attachment portion 67. The attachment portion 67 is, for example, a suspension member.

  The cap 55 is assembled in a liquid-tight manner through the seal ring 57 inside the fixing member 63 of the housing member 53. Further, the cap 55 restricts foreign matter from entering the housing member 53 through the gap between the housing member 53 and the release member 51. The cap 55 is detachably provided with a finger from the first opening end 53b.

  As shown in FIGS. 6 and 7, the cap 55 includes a cap body 55a and a filter 55b. The cap main body 55a has a seal ring mounting groove 55a1, a through hole 55a2, a guide projection 55a3, and a hooking portion 55a4. A seal ring 57 is attached to the seal ring attachment groove 55a1. The through hole 55a2 allows air to flow through the filter 55b. The guide protrusion 55a3 defines the assembled state of the cap 55 by a guide groove (not shown) provided in the housing member 53 when the cap 55 is assembled to the housing member 53. The hook 55a4 is hooked with a finger when the cap 55 is removed from the housing member 53. Each part of the cap body 55a is integrally formed of resin. The filter 55b is formed in a sheet shape by a material through which foreign matters such as water cannot pass and air (gas) can pass, and is assembled airtightly and liquid tightly to the cap body 55a at the peripheral edge. The filter 55b is also referred to as a waterproof filter.

  As shown in FIGS. 2 to 4, the cover 59 is detachably attached to the fixing member 63 of the housing member 53 so as to cover the end surface 53 c and the first opening end portion 53 b. Specifically, the cover 59 is attached to the housing member 53 by, for example, a coupler 71. As shown in FIGS. 3 and 4, the cover 59 is provided with a pair of left and right recesses 59 b, and these recesses 59 b can be hooked on a pin P <b> 2 provided on the fixing member 63. The coupler 71 is, for example, a hexagon socket head bolt. The coupler 71 is screwed into a female screw portion 53 n provided integrally with the housing member 53. The cover 59 constitutes an assembly 72 together with the housing member 53 (fixing member 63).

  As shown in FIGS. 2 and 3, the peripheral edge 59a of the cover 59 projects from the peripheral edge 53d of the end surface 53c.

  As shown in FIGS. 2, 3, and 5, the assembly 72 is provided with an upper air passage 65 and a lower air passage 66 that communicate with the first opening end portion 53 b. The upper air passage 65 is provided above the first opening end 53b, and the lower air passage 66 is provided below the first opening end 53b. The upper air passage 65 and the lower air passage 66 are provided between the housing member 53 and the cover 59. The upper air passage 65 and the lower air passage 66 are provided on the end surface 53c, respectively, and are configured by groove portions 53e and 53f recessed from the end surface 53c. Further, the upper air passage 65 and the lower air passage 66 are each configured to be non-linear. The upper air passage 65 and the lower air passage 66 are examples of the air passage.

  The upper air passage 65 has a pair of left and right second opening end portions 65a1 and 65a2, a third opening end portion 65b, a pair of left and right first portions 65c1 and 65c2, and a second portion 65d. The pair of left and right second opening end portions 65 a 1 and 65 a 2 are provided on the left and right side portions of the assembly 72 and open to the outside of the assembly 72. The pair of left and right second opening end portions 65a1 and 65a2 are opened to the side (horizontal direction) of the vehicle 1, for example. Note that the pair of left and right second opening end portions 65a1 and 65a2 may be opened, for example, in a lower portion D in the vertical direction of the vehicle 1. The third opening end portion 65b opens at the upper end portion of the first opening end portion 53b and communicates with the first opening end portion 53b.

  The pair of left and right first portions 65c1 and 65c2 extend from the pair of left and right second opening end portions 65a1 and 65a2 toward the upper U in the vertical direction of the vehicle 1. Specifically, the pair of left and right first portions 65c1 and 65c2 extend obliquely upward U. The second opening end portions 65a1 and 65a2 are lower end portions of the first portions 65c1 and 65c2. The pair of left and right first portions 65c1 and 65c2 have their upper ends communicating with each other. The pair of left and right first portions 65c1 and 65c2 have a convex shape upward U in a state of being connected to each other.

  The second portion 65d extends upward U from the third opening end 65b. The third opening end portion 65b is a lower end portion of the second portion 65d. The upper end portion of the second portion 65d communicates with the upper end portions of the pair of left and right first portions 65c1 and 65c2. The second portion 65d communicates each of the first portions 65c1 and 65c2 with the first opening end portion 53b. The second portion 65d and the pair of left and right first portions 65c1 and 65c2 constitute a bent path. The upper ventilation path 65 having such a configuration extends non-linearly and communicates the first opening end 53b and the second opening ends 65a1 and 65a2.

  The lower air passage 66 has a pair of left and right second opening end portions 66a1 and 66a2, a third opening end portion 66b, a pair of left and right first portions 66c1 and 66c2, and a second portion 66d. The pair of left and right second opening end portions 66 a 1 and 66 a 2 are provided on the left and right side portions of the assembly 72 and open to the outside of the assembly 72. The pair of left and right second opening end portions 66a1 and 66a2 are opened, for example, obliquely downward on the side of the vehicle 1. The third opening end portion 66b opens at the lower end portion of the first opening end portion 53b and communicates with the first opening end portion 53b.

  The pair of left and right first portions 66 c 1 and 66 c 2 extend from the pair of left and right second opening end portions 66 a 1 and 66 a 2 toward the upper U in the vertical direction of the vehicle 1. Specifically, the pair of left and right first portions 66c1 and 66c2 extend obliquely upward U. The second opening end portions 66a1 and 66a2 are lower end portions of the first portions 66c1 and 66c2. The upper ends of the pair of left and right first portions 66c1 and 66c2 communicate with each other. The pair of left and right first portions 66c1 and 66c2 are in a convex shape upward U while being connected to each other.

  The second portion 66d extends downward D from the third opening end portion 66b. The third opening end portion 66b is an upper end portion of the second portion 66d. The lower end portion of the second portion 66d communicates with the upper end portions of the pair of left and right first portions 66c1 and 66c2. The second portion 66d communicates each of the first portions 66c1 and 66c2 with the first opening end portion 53b. The second portion 66d and the pair of left and right first portions 66c1 and 66c2 constitute a bent path. The lower air passage 66 having such a configuration extends non-linearly and communicates the first opening end 53b and the second opening ends 66a1 and 66a2.

  Further, the second opening end portions 65 a 1 and 65 a 2 of the upper air passage 65 are located above the second opening end portions 66 a 1 and 66 a 2 of the lower air passage 66.

  In the electric parking brake device 2 configured as described above, when the brake switch SW1 is operated, the electric motor 11 is driven to rotate in the forward direction, and the screw shaft 29 of the conversion mechanism 6 is rotated in the forward direction. Along with this, the nut 31 and the equalizer are driven. 33 moves in the axial direction of the screw shaft 29 from the release position in FIG. For this reason, the inner wires 17a and 19a of both the cables 17 and 19 are pulled, and both the parking brakes 13 and 15 are brought into a braking state. When the nut 31 and the equalizer 33 move to the braking position, the tension detected by the tension sensor TS becomes a set value, the forward rotation drive of the electric motor 11 is stopped, and the parking brakes 13 and 15 are braked. State is maintained.

  Further, when the release switch SW2 is operated, the electric motor 11 is driven to rotate backward, and the screw shaft 29 of the conversion mechanism 6 is rotated backward, whereby the nut 31 and the equalizer 33 are moved from the braking position to the released position in FIG. Moving. For this reason, the inner wires 17a and 19a of both cables 17 and 19 are loosened, and both parking brakes 13 and 15 are released. When the nut 31 and the equalizer 33 are moved to the release position in FIG. 1, the tension detected by the tension sensor TS becomes substantially zero, the reverse rotation drive of the electric motor 11 is stopped, and both parking brakes 13, The release state of 15 is maintained.

  In the electric parking brake device 2, the housing is provided via the second opening end portions 65 a 1, 65 a 2, 66 a 1, 66 a 2, the upper air passage 65 and the lower air passage 66, the first opening end portion 53 b, and the storage chamber 53 a. 21 is ventilated. During this ventilation, the cap 55 limits the entry of foreign matter into the housing 21 through the gap between the accommodation member 53 and the release member 51. For this reason, it is possible to maintain the internal pressure of the housing 21 at atmospheric pressure in a state where entry of foreign matter into the interior of the housing 21 is suppressed.

  As described above, in the present embodiment, for example, the electric parking brake device 2 includes the electric motor 11, the mechanism unit 20, the housing 21, the release member 51, the housing member 53, and the cover 59. Yes. The cover 59 is detachably attached to the housing member 53 so as to cover the first opening end 53b. A non-linear upper air passage 65 and a lower air passage 66 are provided between the housing member 53 and the cover 59. The upper air passage 65 and the lower air passage 66 are directed from the second opening end portions 65 a 1, 65 a 2, 66 a 1, 66 a 2 provided in the assembly 72 to the outside of the assembly 72, and upward U in the vertical direction of the vehicle 1. The first opening end portion 53b and the second opening end portions 65a1, 65a2, 66a1, 66a2 are communicated with each other.

  Therefore, according to the present embodiment, for example, in a state where the cover 59 is attached, the cover 59 suppresses entry of foreign matters such as water into the first opening end portion 53b. Further, when the operation unit 51 b is operated, the operation unit 51 b is exposed by removing the cover 59, so that the operation of the operation unit 51 b is not made difficult by the cover 59. Therefore, according to the present embodiment, for example, it is possible to suppress entry of foreign matter into the first opening end portion 53b while suppressing deterioration in operability of the operation portion 51b. Further, the housing 21 can be ventilated through the first opening end portion 53b by a relatively simple structure in which the upper air passage 65 and the lower air passage 66 are provided between the housing member 53 and the cover 59. . Further, for example, since the upper ventilation path 65 and the lower ventilation path 66 are non-linear, the first opening end portion 53b via the upper ventilation path 65 and the lower ventilation path 66 is compared with a linear path. It is easy to suppress the arrival of foreign matter. Further, for example, the first portions 65c1, 65c2, 66c1, 66c2 of the upper air passage 65 and the lower air passage 66 are directed upward in the vertical direction of the vehicle 1 from the second opening end portions 65a1, 65a2, 66a1, 66a2. The foreign matter that has entered the first portions 65c1, 65c2, 66c1, 66c2 is easily discharged by gravity.

  In the present embodiment, for example, the first opening end portion 53b faces downward D. Therefore, according to the present embodiment, for example, even if a foreign object reaches the first opening end 53b via the upper ventilation path 65 and the lower ventilation path 66, the foreign object moves to the back side of the first opening end 53b. It is easy to be suppressed from entering.

  Further, in the present embodiment, for example, the upper ventilation path 65 and the lower ventilation path 66 include a plurality of first portions 65c1, 65c2, 66c1, 66c2, and a plurality of first portions 65c1, 65c2, 66c1, 66c2, respectively. And second portions 65d and 66d communicating with the open end 53b. Therefore, according to the present embodiment, for example, the foreign matter that has entered the upper air passage 65 and the lower air passage 66 is allowed to pass through the second opening end portions 65a1, 65a2, 66a1, 66a2 of the plurality of first portions 65c1, 65c2, 66c1, 66c2. Because it can be discharged from the outside, foreign matter is highly discharged. In addition, for example, foreign matter that has entered a certain first portion 65c1, 65c2, 66c1, or 66c2 can be discharged from another first portion 65c1, 65c2, 66c1, or 66c2.

  In the present embodiment, for example, a plurality of ventilation paths (upper ventilation path 65 and lower ventilation path 66) are provided. Therefore, according to the present embodiment, for example, even if a certain air passage (the upper air passage 65 or the lower air passage 66) is blocked, the other air passage (the upper air passage 65 or the lower air passage 66) is used. The housing 21 can be ventilated.

  In the present embodiment, for example, an upper air passage 65 and a lower air passage 66 are provided as two air passages, and the second opening end portions 65a1 and 65a2 of the upper air passage 65 are provided on the lower air passage 66. The second opening end portions 66a1 and 66a2 are located above the upper U. Therefore, according to the present embodiment, for example, even if the second opening end portions 66a1 and 66a2 of the lower air passage 66 are submerged, the second opening end portions 65a1 and 65a2 and the first opening end of the upper air passage 65 are submerged. If the portion 53b is on the water surface, the housing 21 can be ventilated.

  In the present embodiment, for example, the upper air passage 65 communicates with the upper end portion of the first opening end portion 53b, and the lower air passage 66 communicates with the lower end portion of the first opening end portion 53b. Therefore, according to the present embodiment, for example, even when a foreign object enters the upper ventilation path 65, the foreign object can be discharged from the lower ventilation path 66 via the second opening end portions 65a1, 65a2, 66a1, 66a2. Therefore, it is easy to avoid accumulation of foreign matters near the second opening end portions 65a1, 65a2, 66a1, 66a2.

  Further, in the present embodiment, for example, the housing member 53 includes a fixing member 63 fixed to the attachment portion 67 of the vehicle 1, and the upper air passage 65 and the lower air passage 66 extend from the end surface 53 c of the fixing member 63. It includes recessed groove portions 53e and 53f. Therefore, according to the present embodiment, for example, when the cross-sectional areas of the upper air passage 65 and the lower air passage 66 have a predetermined area in order to ensure a predetermined air flow, it is not necessary to provide a groove in the cover 59. Alternatively, even when the cover 59 is provided with a groove portion constituting the upper air passage 65 and the lower air passage 66, the size (depth, etc.) of the groove portion can be reduced. Therefore, it is easy to make the cover 59 thinner. In addition, since the fixing member 63 of the housing member 53 is formed to have a predetermined thickness so as to have a strength necessary for fixing to the mounting portion 67, it is easy to secure the depth of the groove portions 53e and 53f.

  In the present embodiment, for example, the peripheral portion 59a of the cover 59 protrudes from the peripheral portion 53d of the end surface 53c. Therefore, according to the present embodiment, for example, foreign matter intrusion into the second opening end portions 65a1, 65a2, 66a1, 66a2 of the upper air passage 65 and the lower air passage 66 is easily suppressed by the peripheral edge portion 59a of the cover 59.

  As mentioned above, although embodiment of this invention was illustrated, the said embodiment is an example to the last, Comprising: It is not intending limiting the range of invention. The above embodiment can be implemented in various other forms, and various omissions, replacements, combinations, and changes can be made without departing from the spirit of the invention. The above embodiments are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof. The present invention can be realized by configurations other than those disclosed in the above embodiments, and various effects (including derivative effects) obtained by the basic configuration (technical features) can be obtained. is there. In addition, the specifications of each component (structure, type, direction, shape, size, length, width, thickness, height, number, arrangement, position, material, etc.) should be changed as appropriate. Can do.

  DESCRIPTION OF SYMBOLS 1 ... Vehicle, 2 ... Electric parking brake device, 11 ... Electric motor, 13, 15 ... Parking brake, 20 ... Mechanism part, 21 ... Housing, 51 ... Release member, 51b ... Operation part, 53 ... Housing member, 53b ... No. One opening end, 53c ... end face, 53e, 53f ... groove, 59 ... cover, 63 ... fixing member, 65 ... upper air passage (air passage), 65a1, 65a2, 66a1, 66a2 ... second opening end, 65c1, 65c2, 66c1, 66c2 ... first part, 65d, 66d ... second part, 66 ... lower air passage (air passage), 67 ... mounting part, 59a ... peripheral part, 53d ... peripheral part, 72 ... assembly.

Claims (7)

An electric motor;
A mechanism that is driven by the electric motor and changes the state of the parking brake to a braking state in which the parking brake brakes the wheels of the vehicle and a released state in which the braking of the wheels by the parking brake is released;
A housing containing the mechanism,
An operation unit that is located outside the housing and receives a manual operation is connected to the mechanism unit, and the mechanism unit is driven by a driving force input to the operation unit to control the state of the parking brake. A release member for changing from a state to the release state;
The release member includes at least the operation portion, and includes an end surface, and a first opening end portion that opens to the end surface and exposes the operation portion, and is provided through the first opening end portion of the housing. A housing member communicating the outside and the inside of the housing;
A cover that covers the end face and the first opening end and is detachably attached to the housing member, and constitutes an assembly together with the housing member;
With
A non-linear air passage is provided between the housing member and the cover;
The air passage has a first portion that is provided in the assembly and that opens from the second opening end that opens to the outside of the assembly to the upper side in the vertical direction of the vehicle, and the first opening end and the first opening An electric parking brake device that communicates with the two open ends.   The electric parking brake device according to claim 1, wherein the first opening end portion faces downward in the vertical direction.   3. The electric parking brake according to claim 1, wherein the ventilation path includes a plurality of the first portions, and a second portion that communicates each of the plurality of first portions with the first opening end portion. apparatus.   The electric parking brake device according to any one of claims 1 to 3, wherein a plurality of the air passages are provided. As the two air passages, an upper air passage and a lower air passage are provided,
5. The electric parking brake device according to claim 4, wherein the second opening end portion of the upper air passage is positioned above the second opening end portion of the lower air passage in the vertical direction. The housing member has a fixing member that has the end surface and is fixed to the mounting portion of the vehicle.
The electric parking brake device according to any one of claims 1 to 5, wherein the air passage includes a groove that is recessed from the end surface.   The electric parking brake device according to claim 1, wherein a peripheral portion of the cover projects from a peripheral portion of the end surface.

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