JP7495854B2 - controller - Google Patents

Description

This disclosure relates to a controller installed in a construction machine such as a hydraulic excavator.

Generally, hydraulic excavators, which are representative of construction machinery, are equipped with a self-propelled lower traveling body, an upper rotating body that is rotatably mounted on the lower traveling body, and a working device mounted on the front side of the upper rotating body. Hydraulic excavators are equipped with multiple hydraulic actuators, control valves that control the supply and discharge of hydraulic oil to these multiple hydraulic actuators, and a controller that controls the operation of the control valve. As the controller is composed of many electronic components, it is often placed inside the cab for waterproofing purposes.

In recent years, there has been a trend to increase the output from the controller in order to give the control valve more functions and precisely control the operation of the hydraulic actuator. As the output from the controller increases, the number of cables connected to the output and input sides of the controller also increases, so research is underway to place the controller outside the cab and attach it integrally to the control valve.

On the other hand, as the output from a controller increases, the controller itself becomes larger, which increases the space occupied by the control valve to which the controller is attached, making it difficult to secure space to install the control valve to which the controller is attached. In response to this, a controller has been proposed that has a smaller external shape by arranging two control boards on which control elements are mounted facing each other within a single case (see Patent Document 1).

JP 2002-205610 A

However, controllers using conventional technology do not take into consideration the sealing structure between the inside and outside of the case housing the two control boards, nor the sealing structure between the connector (coupler) connected to the control boards and the case, resulting in the problem that the controller is not necessarily sufficiently waterproof. In particular, in construction machinery such as hydraulic excavators, the control valve is located outside the cab, and the controller attached to the control valve is exposed to rainwater, etc., so it is necessary to ensure sufficient waterproofing.

The objective of one embodiment of the present invention is to provide a controller that can be made compact in external shape while ensuring waterproofing.

One embodiment of the present invention is a controller including a housing with an internal storage space, and two boards to which electronic components and connectors are attached and which are arranged facing each other in the storage space of the housing with the connectors located outside the housing, the housing being composed of a first housing frame and a second housing frame which are combined with each other, the first housing frame and the second housing frame each having a bottom plate facing the board, a peripheral wall plate protruding from the bottom plate and covering the periphery of the board, an inclined plate provided between the bottom plate and the peripheral wall plate and inclined from the bottom plate toward the protruding end of the peripheral wall plate, and a connector mounting portion to which the connector is attached, the bottom plate, the protruding end of the peripheral wall plate, and the protruding end of the inclined plate of the first housing frame and the second housing frame each having a housing seal portion for sealing between the outside of the housing and the storage space, and a connector seal portion for sealing between the housing and the connector is provided between the connector mounting portion and the connector of the first housing frame and the second housing frame, respectively.

According to one embodiment of the present invention, by housing two boards within the housing, the external shape of the controller can be made smaller. Furthermore, the housing seal provides a seal between the outside of the housing and the housing space, and the connector seal provides a seal between the housing and the connector, ensuring waterproofing of the housing.

FIG. 2 is a left side view of a hydraulic excavator on which a controller according to an embodiment of the present invention is mounted. FIG. 2 is a perspective view showing a state in which a controller is attached to a control valve. FIG. 2 is a perspective view showing a controller according to the first embodiment. 4 is a cross-sectional view of the controller as viewed from the direction of arrows IV-IV in FIG. 3. FIG. 2 is a perspective view showing the first housing frame alone. 11 is a perspective view showing a state in which a first substrate is attached to a first housing frame. FIG. 4 is a plan view of the first housing frame seen from above. FIG. FIG. 2 is a plan view of a first substrate viewed from above. FIG. 11 is a perspective view showing a controller according to a second embodiment. 10 is a cross-sectional view of the controller as viewed from the direction of arrows XX in FIG. 9. FIG. 2 is a plan view of a first substrate viewed from above. FIG. 11 is a perspective view showing a first housing frame according to a second embodiment in a separate state. 13 is a perspective view showing a state in which a first substrate is attached to a first housing frame according to a second embodiment. FIG. 4 is a plan view of the first housing frame seen from above. FIG. 15 is a side view of the first housing frame as viewed from the direction of arrows XV-XV in FIG. 14. 13 is an exploded perspective view showing a state in which a first board according to a modified example is attached to a first housing frame. FIG.

The controller according to the embodiment of the present invention will be described in detail below with reference to Figs. 1 to 16. The controller according to the embodiment is integrally attached to a control valve mounted on a hydraulic excavator.

Figures 1 to 8 show a first embodiment of the present invention. The hydraulic excavator 1 shown in Figure 1 is configured to include a crawler-type lower traveling body 2 that is self-propelled in the front-rear direction, an upper rotating body 3 that is rotatably mounted on the lower traveling body 2, and a working device 4 provided in front of the upper rotating body 3. The hydraulic excavator 1 travels on the lower traveling body 2 at a work site, and performs work such as excavating soil and sand by rotating the upper rotating body 3 and raising and lowering the working device 4.

The working device 4 includes a boom 4A that is attached to the front side of a rotating frame 5 (described later) so that it can be raised and lowered, an arm 4B that is rotatably attached to the tip of the boom 4A, and a bucket 4C that is rotatably attached to the tip of the arm 4B. The working device 4 also has a boom cylinder 4D that drives the boom 4A, an arm cylinder 4E that drives the arm 4B, and a bucket cylinder 4F that drives the bucket 4C.

The upper rotating body 3 has a rotating frame 5 that serves as a base. The rotating frame 5 is composed of a bottom plate (not shown) and left and right vertical plates 5A (only the left side is shown) that stand on the bottom plate, and the base ends of the boom 4A and boom cylinder 4D that constitute the working device 4 are attached to the front of the left and right vertical plates 5A. A counterweight 6 that balances the weight of the working device 4 is provided on the rear side of the rotating frame 5.

An exterior cover 7 is provided in front of the counterweight 6 of the revolving frame 5. The interior of the exterior cover 7 is a machinery room, which houses an engine as a prime mover, a hydraulic pump driven by the engine, a heat exchanger for cooling the engine coolant and hydraulic oil, and other on-board equipment (none of which are shown). The prime mover may be an electric motor, or a hybrid prime mover that combines an engine and an electric motor.

A cab 8 is provided on the front left side of the revolving frame 5. The cab 8 is formed in a box shape that defines the driver's compartment, and a driver's seat (not shown) where the operator sits is provided inside the cab 8. A travel lever pedal device (not shown) that controls the travel operation of the hydraulic excavator 1 is provided in front of the driver's seat, and operation lever devices (not shown) that control the revolving operation of the upper revolving body 3 and the operation of the work device 4 are provided on both left and right sides of the driver's seat.

The control valve 9 is disposed on the bottom plate between the left and right vertical plates 5A constituting the revolving frame 5. As shown in FIG. 2, the control valve 9 is composed of a set of a plurality of electromagnetic proportional directional control valves (hereinafter referred to as electromagnetic proportional valves) 10 corresponding to various hydraulic actuators mounted on the hydraulic excavator 1. One end of a cable 10A is connected to each of the plurality of electromagnetic proportional valves 10, and the other end of the plurality of cables 10A is distributed and attached to two valve side connectors 11A and 11B. One valve side connector 11A is connected to a connector 15 described later, and the other valve side connector 11B is connected to a connector 18 described later. The plurality of electromagnetic proportional valves 10 are selectively supplied with control signals from a controller 12 in response to the operation of the travel lever pedal device and the operation lever device in the cab 8. This controls the supply and discharge of hydraulic oil to various hydraulic actuators mounted on the hydraulic excavator 1, and the travel operation of the hydraulic excavator 1, the rotation operation of the upper revolving body 3, and the operation of the work device 4 can be controlled.

The controller 12 is attached integrally to the upper surface 9A of the control valve 9, and is an integrated mechanical and electrical controller integrated with the control valve 9. The controller 12 supplies control signals to the multiple electromagnetic proportional valves 10 that make up the control valve 9 in response to the operation of the travel lever pedal device and the operating lever device in the cab 8. The controller 12 is composed of a housing 13 with an internal storage space 13A, and a first board 14 and a second board 17 that are housed facing each other in the storage space 13A of the housing 13.

As shown in Figs. 4 and 8, the first board 14 is, for example, a rectangular printed circuit board, and has multiple electronic components (not shown) mounted thereon. A connector 15 is mounted on one end 14A of the first board 14 in the longitudinal direction, and one of the valve side connectors 11A is electrically connected to this connector 15. The first board 14 is provided with multiple (e.g., seven) bolt insertion holes 14B. By screwing the bolts 16 inserted into the multiple bolt insertion holes 14B into the screw seats 20D of the first housing frame 19, the first board 14 is accommodated in the accommodation space 13A of the housing 13 with the connector 15 located outside the housing 13.

The connector 15 attached to the first board 14 is composed of a block-shaped mounting portion 15A, flat inner and outer flanges 15B and 15C, multiple leads 15D, and a rectangular frame portion 15E. The mounting portion 15A is sandwiched between the first housing frame 19 and the second housing frame 24. The inner and outer flanges 15B and 15C are formed in a rectangular shape larger than the mounting portion 15A, and the inner flange 15B abuts against the inner side of the housing 13 and the outer flange 15C abuts against the outer side of the housing 13, thereby positioning the connector 15 relative to the housing 13. The multiple leads 15D are electrically connected to the first board 14 and protrude outside the outer flange 15C through the mounting portion 15A and the outer flange 15C. The frame 15E surrounds multiple leads 15D that protrude outside the outer flange 15C, and is connected to one of the valve side connectors 11A, electrically connecting the leads 15D to the cable 10A of the solenoid proportional valve 10.

Here, a trapezoidal convex portion 15F and a sealant application portion 15G are provided between the inner flange portion 15B and the outer flange portion 15C of the connector 15. The trapezoidal convex portion 15F rises perpendicularly to the first board 14 from the outer peripheral surface of the mounting portion 15A, and is formed in an isosceles trapezoidal flat plate shape that is widest on the first board 14 side and narrows as it moves away from the first board 14. This trapezoidal convex portion 15F fits into the trapezoidal recessed portion 28B of the second housing frame 24. On the other hand, the sealant application portion 15G is formed by recessing the surface of the outer peripheral surface of the mounting portion 15A opposite to the trapezoidal convex portion 15F. The sealant application portion 15G is applied with a sealant 35.

The other board, the second board 17, is constructed of a printed circuit board having the same shape as the first board 14, and has multiple electronic components (not shown) mounted thereon. A connector 18 is mounted on one end 17A of the second board 17 in the longitudinal direction, and the other valve side connector 11B is electrically connected to this connector 18. The second board 17 is provided with multiple bolt insertion holes 17B, similar to the first board 14, and the bolts 16 inserted into these multiple bolt insertion holes 17B are screwed into the screw seats 25D of the second housing frame 24, so that the second board 17 is accommodated in the accommodation space 13A of the housing 13 with the connector 18 located outside the housing 13.

The connector 18 attached to the second board 17 has the same shape as the connector 15 of the first board 14, and is composed of an attachment portion 18A, an inner flange portion 18B, an outer flange portion 18C, a plurality of leads 18D, and a frame portion 18E. In addition, a trapezoidal convex portion 18F and a sealant application portion 18G are provided between the inner flange portion 18B and the outer flange portion 18C of the connector 18. The trapezoidal convex portion 18F becomes the trapezoidal recess portion 23B of the first housing frame 19. The sealant application portion 18G is coated with sealant 35.

Next, the first housing frame 19 and the second housing frame 24 that constitute the housing 13 will be described. The first housing frame 19 and the second housing frame 24 are combined with each other to form the housing 13, the interior of which is the storage space 13A. The first housing frame 19 and the second housing frame 24 are a pair of molded products formed into the same shape using a common molding die.

As shown in Figures 5 and 7, the first housing frame 19 is configured to include a rectangular bottom plate 20, a peripheral wall plate 21 protruding from the bottom plate 20, an inclined plate 22 provided between the bottom plate 20 and the peripheral wall plate 21, and a connector mounting portion 23.

The bottom plate 20 is the base of the first housing frame 19 and is formed in a rectangular flat plate shape facing the first board 14. A peripheral wall plate 21 is provided on one end 20A of the bottom plate 20 in the longitudinal direction. A first protrusion 31 (described later) is provided on the other end 20B of the bottom plate 20 in the longitudinal direction. A plurality of (e.g., seven) cylindrical screw seats 20D protrude from the upper surface 20C of the bottom plate 20. These screw seats 20D support the first board 14 by screwing the bolts 16 inserted into the bolt insertion holes 14B of the first board 14. In addition, two bottom plate brackets 20E protrude from both sides of the width of the bottom plate 20 at the other end 20B in the longitudinal direction.

The peripheral wall plate 21 is disposed on one end 20A of the bottom plate 20 and protrudes vertically from the bottom plate 20. The peripheral wall plate 21 has an intermediate plate portion 21A rising from one end 20A of the bottom plate 20, and a pair of side plate portions 21B extending from both ends of the intermediate plate portion 21A to the other end 20B of the bottom plate 20 and facing each other in the width direction of the bottom plate 20. The peripheral wall plate 21 consisting of the intermediate plate portion 21A and the side plate portion 21B covers the periphery of the first substrate 14 supported by the screw seat 20D of the bottom plate 20. In addition, the protruding end 21C of the peripheral wall plate 21 consisting of the intermediate plate portion 21A and the side plate portion 21B is set to have the same protruding length from the upper surface 20C of the bottom plate 20 and is horizontal to the bottom plate 20. The intermediate plate portion 21A of the peripheral wall plate 21 is formed with a connector mounting portion 23. A pair of side plate portions 21B of the peripheral wall plate 21 each have a peripheral wall plate side bracket 21D protruding therefrom.

The pair of inclined plates 22 is provided between the pair of side plate portions 21B constituting the peripheral wall plate 21 and the bottom plate 20. The pair of inclined plates 22 protrude from the other end 20B side of the bottom plate 20 toward the protruding end 21C of the peripheral wall plate 21 (side plate portion 21B) so as to be inclined obliquely upward. The pair of inclined plates 22 covers the periphery of the first substrate 13 together with the peripheral wall plate 21. The protruding end 22A of the pair of inclined plates 22 gradually extends obliquely upward in a straight line from the upper surface 20C of the bottom plate 20 toward the protruding end 21C of the peripheral wall plate 21 (side plate portion 21B). The inclined plate 22 and the peripheral wall plate 21 have the same plate thickness, and the side plate portion 21B of the peripheral wall plate 21 and the inclined plate 22 are smoothly continuous. The protruding end 21C of the peripheral wall plate 21 and the protruding end 22A of the inclined plate 22 are provided with a first groove portion 30 described later.

The connector mounting portion 23 is provided on the intermediate plate portion 21A of the peripheral wall plate 21. The connector 18 provided on the second board 17 is attached to the connector mounting portion 23 (see FIG. 4). The connector mounting portion 23 is formed as an isosceles trapezoidal recess by cutting the intermediate plate portion 21A of the peripheral wall plate 21 from the protruding end 21C toward the bottom plate 20 in a trapezoidal shape, with the protruding end 21C side being the widest and the width decreasing as it moves away from the protruding end 21C. The protruding end 23A of the connector mounting portion 23 protruding from the bottom plate 20 is formed with a trapezoidal recess 23B having a similar shape but one size larger than the trapezoidal protrusion 18F of the connector 18 attached to the second board 17. The trapezoidal recess 23B engages with the trapezoidal protrusion 18F of the connector 18.

The second housing frame 24 is composed of a rectangular bottom plate 25, a peripheral wall plate 26 protruding from the bottom plate 25, an inclined plate 27 provided between the bottom plate 25 and the peripheral wall plate 26, and a connector mounting portion 28, and has the same shape as the first housing frame 19.

The bottom plate 25 is formed in a rectangular flat plate shape facing the second substrate 17, and a peripheral wall plate 26 is provided on one end 25A of the bottom plate 25 in the longitudinal direction. A second protrusion 33 (described later) is provided on the other end 25B of the bottom plate 25 in the longitudinal direction. A plurality of (e.g., seven) screw seats 25D protrude from the upper surface 25C of the bottom plate 25, and these screw seats 25D support the second substrate 17 by screwing bolts 16 inserted into the bolt insertion holes 17B of the second substrate 17. In addition, two bottom plate brackets 25E protrude from both sides of the bottom plate 25 in the width direction.

The peripheral wall plate 26 is disposed on one end 25A of the bottom plate 25 and protrudes vertically from the bottom plate 25. The peripheral wall plate 26 has an intermediate plate portion 26A rising from one end 25A of the bottom plate 25 and a pair of side plate portions 26B extending from both ends of the intermediate plate portion 26A to the other end 25B of the bottom plate 25. The peripheral wall plate 26 consisting of the intermediate plate portion 26A and the side plate portion 26B covers the periphery of the second substrate 17 supported by the screw seat 25D of the bottom plate 25. The protruding end 26C of the peripheral wall plate 26 consisting of the intermediate plate portion 26A and the side plate portion 26B is set to have the same protruding length from the upper surface 25C of the bottom plate 25 and is horizontal to the bottom plate 25. The intermediate plate portion 26A of the peripheral wall plate 26 is formed with a connector mounting portion 28. The pair of side plate portions 26B of the peripheral wall plate 26 each have a peripheral wall plate side bracket 26D protruding therefrom.

The pair of inclined plates 27 are provided between the pair of side plate portions 26B constituting the peripheral wall plate 26 and the bottom plate 25. The pair of inclined plates 27 protrude from the other end 25B side of the bottom plate 25 toward the protruding end 26C of the peripheral wall plate 26 (side plate portion 26B) so as to be inclined obliquely upward. The protruding end 27A of the pair of inclined plates 27 gradually extends in a straight line obliquely upward from the upper surface 25C of the bottom plate 25 toward the protruding end 26C of the peripheral wall plate 26 (side plate portion 26B), and the side plate portion 26B of the peripheral wall plate 26 and the inclined plate 27 are smoothly continuous. The protruding end 26C of the peripheral wall plate 26 and the protruding end 27A of the inclined plate 27 are provided with a second groove portion 32 described later.

The connector mounting portion 28 is provided on the intermediate plate portion 26A of the peripheral wall plate 26. The connector 15 provided on the first board 14 is attached to the connector mounting portion 28 (see FIG. 4). The connector mounting portion 28 is formed as an isosceles trapezoidal recess by cutting the intermediate plate portion 26A of the peripheral wall plate 26 from the protruding end 26C toward the bottom plate 25 in a trapezoidal shape, with the protruding end 26C side being the widest and the width decreasing as it moves away from the protruding end 26C. The protruding end 28A of the connector mounting portion 28 protruding from the bottom plate 25 is formed with a trapezoidal recess 28B that is similar in shape to but slightly larger than the trapezoidal protrusion 15F of the connector 15 attached to the first board 14. The trapezoidal recess 28B engages with the trapezoidal protrusion 15F of the connector 15 when the sealant 35 is applied.

The housing seal 29 is provided at the joint between the bottom plate 20, the protruding end 21C of the peripheral wall plate 21, and the protruding end 22A of the inclined plate 22 of the first housing frame 19 and the bottom plate 25, the protruding end 26C of the peripheral wall plate 26, and the protruding end 27A of the inclined plate 27 of the second housing frame 24. The housing seal 29 is configured to include a first groove 30, a first protruding portion 31, a second groove 32, and a second protruding portion 33, and seals between the outside of the housing 13 and the storage space 13A.

The first groove 30 is provided on the protruding end 21C of the peripheral wall plate 21 and on the protruding ends 22A of the pair of inclined plates 22 that constitute the first housing frame 19. As shown in FIG. 5, the first groove 30 is formed by cutting out the center of the peripheral wall plate 21 and the inclined plate 22 in the plate thickness direction, and communicates with the trapezoidal recess 23B provided in the connector mounting portion 23 at the protruding end 22A of the intermediate plate portion 21A and extends to the middle of the length of the protruding end 22A of the inclined plate 22.

The first convex portion 31 is provided on the upper surface 20C on the other end 20B side of the bottom plate 20 constituting the first housing frame 19, and on the protruding end 22A of the pair of inclined plates 22. As shown in FIG. 5, the first convex portion 31 has a plate thickness approximately equal to the groove width of the first groove portion 30, and protrudes from the upper surface 20C of the bottom plate 20 and the protruding end 22A of the inclined plate 22. As shown in FIG. 5, the end 31A of the first convex portion 31 extends to the middle position in the length direction of the pair of inclined plates 22, respectively, and is continuous with the first groove portion 30. As shown in FIG. 7, if the length dimension of the first housing frame 19 (the length dimension from one end 20A to the other end 20B of the bottom plate 20) is A, the distance from the other end 20B of the bottom plate 20 to the end 31A of the first convex portion 31 is set to A/2.

The second groove 32 is provided on the protruding end 26C of the peripheral wall plate 26 that constitutes the second housing frame 24, and on the protruding ends 27A of the pair of inclined plates 27. Like the first groove 30, the second groove 32 is formed by cutting out the center of the peripheral wall plate 26 and the inclined plate 27 in the plate thickness direction, and communicates with the trapezoidal recess 28B provided in the connector mounting portion 28 at the protruding end 27A of the intermediate plate portion 26A, and extends to the middle of the length of the protruding end 27A of the inclined plate 27.

The second protrusion 33 is provided on the upper surface 25C on the other end 25B side of the bottom plate 25 constituting the second housing frame 24, and on the protruding end 27A of the pair of inclined plates 27. Like the first protrusion 31, the second protrusion 33 has a plate thickness approximately equal to the groove width of the second groove portion 32, and protrudes from the upper surface 25C of the bottom plate 25 and the protruding end 27A of the inclined plate 27. The end 33A of the second protrusion 33 extends to the middle position in the length direction of the pair of inclined plates 27, respectively, and is continuous with the second groove portion 32. Like the first protrusion 31, when the length dimension of the second housing frame 24 is A, the distance from the other end 25B of the bottom plate 25 to the end 33A of the second protrusion 33 is set to A/2.

When the first housing frame 19 and the second housing frame 24 are assembled, the second convex portion 33 of the second housing frame 24 fits into the first groove portion 30 of the first housing frame 19, and the first convex portion 31 of the first housing frame 19 fits into the second groove portion 32 of the second housing frame 24. Therefore, for example, by assembling the first housing frame 19 and the second housing frame 24 with a sealant 35 applied to the first groove portion 30 of the first housing frame 19 and the second groove portion 32 of the second housing frame 24, a housing seal portion 29 is formed, which is made up of the fitting portion between the first groove portion 30 and the second convex portion 33 and the fitting portion between the second groove portion 32 and the first convex portion 31.

In this case, the first groove 30 is formed at the protruding end 21C of the peripheral wall plate 21, which is horizontal to the bottom plate 20, and the protruding end 22A of the inclined plate 22, which is inclined obliquely upward from the upper surface 20A of the bottom plate 20 toward the protruding end 21C. This allows the sealant 35 to be reliably held in the first groove 30, and allows the fitting portion between the first groove 30 and the second convex portion 33 to be filled with a sufficient amount of sealant 35. Similarly, the second groove 32 is formed at the protruding end 26C of the peripheral wall plate 26, which is horizontal to the bottom plate 25, and the protruding end 27A of the inclined plate 27, which is inclined obliquely upward from the upper surface 25A of the bottom plate 25 toward the protruding end 26C. This allows the sealant 35 to be reliably held in the second groove 32, and allows the fitting portion between the second groove 32 and the first convex portion 31 to be filled with a sufficient amount of sealant 35.

The connector seal 34 is provided between the connector mounting portion 23 of the first housing frame 19 and the connector 18 of the second board 17, and seals the gap between them. That is, the connector seal 34 is composed of a sealant 35 provided at the fitting portion between the trapezoidal recess 23B of the connector mounting portion 23 and the trapezoidal protrusion 18F of the connector 18. The connector seal 34 is also provided between the connector mounting portion 28 of the second housing frame 24 and the connector 15 of the first board 14, and seals the gap between them. That is, the connector seal 34 is composed of a sealant 35 provided at the fitting portion between the trapezoidal recess 28B of the connector mounting portion 28 and the trapezoidal protrusion 15F of the connector 15.

In addition, when the first board 14 is attached to the first housing frame 19, the sealant application portion 15G of the connector 15 provided on the first board 14 fits with a gap into the first convex portion 31 provided on the bottom plate 20 of the first housing frame 19. For this reason, the sealant application portion 15G of the connector 15 is pre-applied with a sealant 35, and the connector 15 and the bottom plate 20 are sealed by this sealant 35. Similarly, when the second board 17 is attached to the second housing frame 24, the sealant application portion 18G of the connector 18 provided on the second board 17 fits with a gap into the second convex portion 33 provided on the bottom plate 25 of the second housing frame 24. For this reason, the sealant application portion 18G of the connector 18 is pre-applied with a sealant 35, and the connector 18 and the bottom plate 25 are sealed by this sealant 35.

The controller 12 according to this embodiment has the configuration described above, and the procedure for assembling the controller 12 is described below.

When assembling the controller 12, the first board 14 on which electronic components (not shown) and the connector 15 are mounted is prepared, and the sealant 35 is applied in advance to the sealant application portion 15G of the connector 15. Next, the bolt 16 inserted into the bolt insertion hole 14B of the first board 14 is screwed into the screw seat 20D provided on the bottom plate 20 of the first housing frame 19. As a result, the first board 14 is attached to the first housing frame 19 in a state where it faces the bottom plate 20 with a gap. In this state, the sealant application portion 15G of the connector 15 fits into the first protrusion 31 provided on the bottom plate 20 of the first housing frame 19 with a gap. As a result, the sealant 35 applied in advance to the sealant application portion 18G can seal the connector 15 and the bottom plate 20.

Similarly, a second board 17 on which electronic components and a connector 18 are mounted is prepared, and a sealant 35 is applied in advance to the sealant application portion 18G of the connector 18. Next, the bolt 16 inserted into the bolt insertion hole 17B of the second board 17 is screwed into the screw seat 25D provided on the bottom plate 25 of the second housing frame 24. As a result, the second board 17 is attached to the second housing frame 24 in a state where it faces the bottom plate 25 with a gap. In this state, the sealant application portion 18G of the connector 18 fits into the second protrusion 33 provided on the bottom plate 25 of the second housing frame 24 with a gap. As a result, the sealant 35 applied in advance to the sealant application portion 18G can seal the connector 18 and the bottom plate 25.

Next, the sealant 35 is applied to the first housing frame 19 to which the first substrate 14 is attached. Specifically, an appropriate amount of the sealant 35 is applied (filled) to the protruding end 21C of the peripheral wall plate 21 constituting the first housing frame 19, the first groove portion 30 provided in the protruding end 22A of the pair of inclined plates 22, and the trapezoidal recessed portion 23B provided in the connector mounting portion 23 of the first housing frame 19. Similarly, the sealant 35 is applied to the second housing frame 24 to which the second substrate 17 is attached. Specifically, an appropriate amount of the sealant 35 is applied (filled) to the protruding end 26C of the peripheral wall plate 26 constituting the second housing frame 24, the second groove portion 32 provided in the protruding end 27A of the pair of inclined plates 27, and the trapezoidal recessed portion 28B provided in the connector mounting portion 28 of the second housing frame 24.

Next, the first housing frame 19 to which the first substrate 14 is attached is combined with the second housing frame 24 to which the second substrate 17 is attached. Specifically, the first convex portion 31 provided on the upper surface 20C of the bottom plate 20 constituting the first housing frame 19 and on the protruding ends 22A of the pair of inclined plates 22 is fitted into the second groove portion 32 provided in the second housing frame 24, and the trapezoidal convex portion 15F of the connector 15 provided on the first substrate 14 is fitted into the trapezoidal recessed portion 28B provided in the connector mounting portion 28 of the second housing frame 24. At the same time, the upper surface 25C of the bottom plate 25 constituting the second housing frame 24 and the second convex portion 33 provided on the protruding ends 27A of the pair of inclined plates 27 are fitted into the first groove portion 30 provided in the first housing frame 19, and the trapezoidal convex portion 18F of the connector 18 provided on the second board 17 is fitted into the trapezoidal recessed portion 23B provided in the connector mounting portion 23 of the first housing frame 19.

In this manner, with the first housing frame 19 and the second housing frame 24 assembled, the bottom plate side bracket 20E and the peripheral wall plate side bracket 21D of the first housing frame 19 abut against the peripheral wall plate side bracket 26D and the bottom plate side bracket 25E of the second housing frame 24, respectively. In this state, as shown in FIG. 3, the bolt 36 is inserted through the bottom plate side bracket 25E and the peripheral wall plate side bracket 21D, and the nut 36A is screwed in place. Similarly, the bolt 36 is inserted through the peripheral wall plate side bracket 26D and the bottom plate side bracket 20E, and the nut 36A is screwed in place.

As a result, the first housing frame 19 and the second housing frame 24 are fixed in a combined state, and the housing 13 with the interior being the accommodation space 13A can be formed. The first board 14 is arranged in the accommodation space 13A of the housing 13 with the connector 15 arranged outside the housing 13, and the second board 17 is arranged in the accommodation space 13A of the housing 13 with the connector 18 arranged outside the housing 13. In this case, the connector 15 of the first board 14 and the connector 18 of the second board 17 are arranged on different surfaces of the housing 13, that is, on two surfaces facing each other in the length direction of the housing 13. Therefore, when one valve side connector 11A to which multiple cables 10A extending from the control valve 9 (electromagnetic proportional valve 10) are connected is connected to the connector 15, and the other valve side connector 11B is connected to the connector 18, it is possible to avoid multiple cables 10A being mixed in a narrow space, and the workability can be improved.

Here, when the first housing frame 19 and the second housing frame 24 are combined, the first convex portion 31 provided on the first housing frame 19 fits into the second groove portion 32 provided on the second housing frame 24, and the fitting portion between the first convex portion 31 and the second groove portion 32 is filled with a sealant 35. Also, the second convex portion 33 provided on the second housing frame 24 fits into the first groove portion 30 provided on the first housing frame 19, and the fitting portion between the second convex portion 33 and the first groove portion 30 is filled with a sealant 35. In this way, the controller 12 according to this embodiment has a housing seal portion 29 provided between the bottom plate 20 of the first housing frame 19, the protruding end 21C of the peripheral wall plate 21, and the protruding end 22A of the pair of inclined plates 22, and the bottom plate 25 of the second housing frame 24, the protruding end 26C of the peripheral wall plate 26, and the protruding end 27A of the pair of inclined plates 27. As a result, the housing seal 29 can provide a liquid-tight seal between the outside of the housing 13 and the storage space 13A.

On the other hand, when the first housing frame 19 and the second housing frame 24 are combined, the trapezoidal convex portion 15F of the connector 15 provided on the first board 14 fits into the trapezoidal recessed portion 28B provided in the connector mounting portion 28 of the second housing frame 24, and the fitting portion between the trapezoidal convex portion 15F and the trapezoidal recessed portion 28B is filled with a sealant 35. Also, the trapezoidal convex portion 18F of the connector 18 provided on the second board 17 fits into the trapezoidal recessed portion 23B provided in the connector mounting portion 23 of the first housing frame 19, and the fitting portion between the trapezoidal convex portion 18F and the trapezoidal recessed portion 23B is filled with a sealant 35. In this way, the controller 12 according to this embodiment has a connector seal portion 34 provided between the connector mounting portion 23 of the first housing frame 19 and the connector 18 of the second board 17, and between the connector mounting portion 28 of the second housing frame 24 and the connector 15 of the first board 14. As a result, the connector seal portion 34 can provide a liquid-tight seal between the connector 15 and the connector 18 and the housing 13.

Thus, the controller 12 according to the embodiment includes a housing 13 having an interior storage space 13A, and a first board 14 and a second board 17 arranged facing each other within the storage space 13A of the housing 13. The housing 13 is formed of a first housing frame 19 and a second housing frame 24 that are fitted together. The first housing frame 19 has a bottom plate 20, a peripheral wall plate 21, an inclined plate 22 that inclines from the bottom plate 20 toward the protruding end of the peripheral wall plate 21, and a connector mounting portion 23 to which the connector 18 of the second board 17 is attached. The second housing frame 24 has a bottom plate 25, a peripheral wall plate 26, an inclined plate 27 that inclines from the bottom plate 25 toward the protruding end of the peripheral wall plate 26, and a connector mounting portion 28 to which the connector 15 of the first board 14 is attached. The bottom plate 20, the protruding end 21C of the peripheral plate 21, and the protruding end 22A of the inclined plate 22 of the first housing frame 19, and the bottom plate 25, the protruding end 26C of the peripheral plate 26, and the protruding end 27A of the inclined plate 27 of the second housing frame 24 are provided with housing seals 29 that seal between the outside of the housing 13 and the storage space 13A, and the connector seals 34 that seal between the housing 13 and the connector 15 and between the connector mounting portion 23 of the first housing frame 19 and the connector 18, and between the connector mounting portion 28 of the second housing frame 24 and the connector 15, respectively, are provided with connector seals 34.

With this configuration, by arranging the first board 14 and the second board 17 facing each other within the storage space 13A of the single housing 13, the external shape of the controller 12 housing the first board 14 and the second board 17 can be made as small as possible. Therefore, as shown in FIG. 2, by attaching the controller 12 to the upper surface 9A of the control valve 9, the control valve 9 and the controller 12 can be arranged compactly within the limited space of the upper rotating body 3 of the hydraulic excavator 1.

The housing seal 29 can seal between the outside of the housing 13 and the housing space 13A, and the connector seal 34 can seal between the first housing frame 19 and the connector 18, and between the second housing frame 24 and the connector 15. As a result, even if the controller 12 is placed in a location exposed to rainwater, etc., it is possible to prevent rainwater, etc. from entering the housing space 13A of the controller 12, and to protect the first board 14, second board 17, etc.

Moreover, the first housing frame 19 is provided with a pair of inclined plates 22 that incline obliquely upward from the bottom plate 20 toward the protruding end 21C of the peripheral wall plate 21, so that the boundary between the bottom plate 20 and the peripheral wall plate 21 can be an inclined surface rather than a vertical surface. Similarly, the second housing frame 24 is provided with a pair of inclined plates 27 that incline obliquely upward from the bottom plate 25 toward the protruding end 26C of the peripheral wall plate 26, so that the boundary between the bottom plate 25 and the peripheral wall plate 26 can be an inclined surface rather than a vertical surface. This makes it possible to prevent the sealant 35 from flowing down to the bottom plate 20 side when applied to the protruding end 22A of the pair of inclined plates 22, and to prevent the sealant 35 from flowing down to the bottom plate 25 side when applied to the protruding end 27A of the pair of inclined plates 27. As a result, when the first housing frame 19 and the second housing frame 24 are combined to form the housing 13, the sealant 35 can be reliably applied to the protruding end 22A of the inclined plate 22 and the protruding end 27A of the inclined plate 27. As a result, the sealing performance of the housing seal portion 29 can be improved, and the reliability of the controller 12 can be improved.

In the embodiment, the first board 14 is attached to the first housing frame 19, and the second board 17 is attached to the second housing frame 24. When the first housing frame 19 and the second housing frame 24 are combined to form the housing 13, the connector 15 attached to the first board 14 and the connector 18 attached to the second board 17 are arranged on different sides of the housing 13. With this configuration, when the controller 12 is integrally attached to the control valve 9, as shown in FIG. 2, for example, a large number of cables 10A extending from the control valve 9 (electromagnetic proportional valve 10) can be divided into one valve side connector 11A and the other valve side connector 11B, and the one valve side connector 11A can be connected to the connector 15 and the other valve side connector 11B can be connected to the connector 18. As a result, it is possible to avoid multiple cables 10A being mixed in a narrow space, and the workability when connecting the cables 10A to the connectors 15 and 18 can be improved.

In addition, in the embodiment, the housing seal portion 29 is composed of a first groove portion 30 provided on the protruding end 21C of the peripheral wall plate 21 of the first housing frame 19 and the protruding end 22A of the pair of inclined plates 22, a first convex portion 31 provided on the protruding end 22A of the pair of inclined plates 22 of the first housing frame 19 and the bottom plate 20, which is continuous with the first groove portion 30, a second groove portion 32 provided on the protruding end 26C of the peripheral wall plate 26 of the second housing frame 24 and the protruding end 27A of the pair of inclined plates 27, which fits into the first convex portion 31, and a second convex portion 33 provided on the protruding end 27A of the pair of inclined plates 27 of the second housing frame 24 and the bottom plate 25, which is continuous with the second groove portion 32, and which fits into the first groove portion 30. According to this configuration, when the first housing frame 19 and the second housing frame 24 are assembled, the first groove 30 of the first housing frame 19 can be fitted into the second protrusion 33 of the second housing frame 24, and the second groove 32 of the second housing frame 24 can be fitted into the first protrusion 31 of the first housing frame 19. As a result, the sealing performance between the outside of the housing 13 and the storage space 13A can be further improved.

In the embodiment, the connector mounting portion 23 of the first housing frame 19 has a trapezoidal recessed portion 23B that is wider on the protruding end 21C side of the peripheral wall plate 21 and narrows toward the bottom plate 20, and the connector mounting portion 28 of the second housing frame 24 has a trapezoidal recessed portion 28B that is wider on the protruding end 26C side of the peripheral wall plate 26 and narrows toward the bottom plate 25. The connector 15 is provided with a trapezoidal convex portion 15F that rises perpendicularly to the first board 14 and fits into the trapezoidal recessed portion 28B of the second housing frame 24, and the connector 18 is provided with a trapezoidal convex portion 18F that rises perpendicularly to the second board 17 and fits into the trapezoidal recessed portion 23B of the first housing frame 19, and the connector seal portion 34 is provided at the fitting portion between the trapezoidal recessed portion 28B and the trapezoidal convex portion 15F and the fitting portion between the trapezoidal recessed portion 23B and the trapezoidal convex portion 18F. With this configuration, when the first housing frame 19 and the second housing frame 24 are assembled, the trapezoidal recessed portion 23B of the first housing frame 19 can be fitted into the trapezoidal protruding portion 18F of the connector 18, and the trapezoidal recessed portion 28B of the second housing frame 24 can be fitted into the trapezoidal protruding portion 15F of the connector 15. As a result, the sealing performance between the housing 13 and the connector 15 and between the housing 13 and the connector 18 can be further improved.

Furthermore, in the embodiment, the first housing frame 19 and the second housing frame 24 are a pair of molded products formed into the same shape using a common molding die. With this configuration, the first housing frame 19 and the second housing frame 24 can be molded by manufacturing one type of molding die, which can also contribute to reducing the cost of the housing 13.

Next, Figures 9 to 15 show a second embodiment. The feature of this embodiment is that the housing is formed in a square shape when viewed from above, and the connectors provided on the first board and the connectors provided on the second board are respectively arranged on two adjacent sides of the housing.

The controller 41 shown in FIG. 9 is attached integrally to the control valve 9 mounted on the hydraulic excavator 1, similar to the controller 12 according to the first embodiment. The controller 41 includes a housing 42 having an internal storage space 42A, and a first board 43 and a second board 46 housed facing each other in the storage space 42A of the housing 42.

As shown in Figs. 10 and 11, the first board 43 is, for example, a square-shaped printed circuit board, and is equipped with a plurality of electronic components (not shown), a connector 44, etc. The first board 43 is provided with a plurality of (for example, five) bolt insertion holes 43A, and is attached to a first housing frame 48 described later using bolts 45 inserted through the bolt insertion holes 43A. The connector 44 is composed of a block-shaped mounting portion 44A, a flat inner flange portion 44B and an outer flange portion 44C, a plurality of leads 44D, and a rectangular cylindrical frame portion 44E. The mounting portion 44A is sandwiched between the first housing frame 48 and the second housing frame 53. The inner flange portion 44B abuts against the inner side of the housing 42, and the outer flange portion 44C abuts against the outer side of the housing 42. The multiple leads 44D are electrically connected to the first substrate 43, and the tips of the leads 44D protrude outside the outer flange portion 44C. The frame portion 44E surrounds the multiple leads 44D that protrude outside the outer flange portion 44C.

Between the inner flange 44B and the outer flange 44C of the connector 44, a trapezoidal convex portion 44F and a sealant application portion 44G are provided. The trapezoidal convex portion 44F is formed in the shape of an isosceles trapezoidal flat plate that narrows the further away from the first substrate 43. On the other hand, the sealant application portion 44G is formed by recessing the outer peripheral surface of the mounting portion 44A on the side opposite the trapezoidal convex portion 44F.

The other board, the second board 46, is a printed circuit board having the same shape as the first board 43, and is equipped with a number of electronic components (not shown), a connector 47, etc. The second board 46 is provided with a number of bolt insertion holes 46A, and is attached to the second housing frame 53 using bolts 45 inserted through the bolt insertion holes. The connector 47 has the same shape as the connector 44 of the first board 43, and is composed of an attachment portion 47A, an inner flange portion 47B, an outer flange portion 47C, a number of leads 47D, and a frame portion 47E. In addition, a trapezoidal convex portion 47F and a sealant application portion 47G are provided between the inner flange portion 47B and the outer flange portion 47C of the connector 47.

Next, the first housing frame 48 and the second housing frame 53 that constitute the housing 42 will be described. The first housing frame 48 and the second housing frame 53 are combined with each other to form the housing 42, the interior of which is the storage space 42A. The first housing frame 48 and the second housing frame 53 are a pair of molded products formed into the same shape using a common molding die.

As shown in Figures 12 to 15, the first housing frame 48 is configured to include a square-shaped bottom plate 49, a peripheral wall plate 50 protruding from the bottom plate 49, an inclined plate 51 provided between the bottom plate 49 and the peripheral wall plate 50, and a connector mounting portion 52.

The bottom plate 49 is formed in a square flat plate shape surrounded by four mutually perpendicular sides 49A, 49B, 49C, 49D. A plurality of (e.g., five) screw seats 49F protrude from the top surface 49E of the bottom plate 49. These screw seats 49F support the first board 43 by screwing in bolts 45 inserted into the bolt insertion holes 43A of the first board 43. A bottom plate side bracket 49G protrudes from each of the two adjacent sides 49A, 49B of the bottom plate 49.

The peripheral wall plate 50 is provided along two adjacent sides 49C, 49D of the bottom plate 49 and protrudes vertically from the bottom plate 49. The peripheral wall plate 50 has a first peripheral wall plate 50A extending along the side 49C and an other peripheral wall plate 50B extending along the side 49D, and covers the periphery of the first substrate 43 supported by the screw seat 49F of the bottom plate 49. The protruding end 50C of the first peripheral wall plate 50A and the protruding end 50D of the other peripheral wall plate 50B are set to have the same protruding length from the upper surface 49E of the bottom plate 49 and are horizontal to the bottom plate 49. The one side peripheral wall plate 50A is formed with a connector mounting portion 52. The one side peripheral wall plate 50A and the other side peripheral wall plate 50B each have a peripheral wall plate side bracket 50E protruding therefrom.

The inclined plate 51 is provided between the peripheral wall plate 50 and the bottom plate 49. The inclined plate 51 is composed of a one-side inclined plate 51A provided between the one-side peripheral wall plate 50A and the bottom plate 49, and an other-side inclined plate 51B provided between the other-side peripheral wall plate 50B and the bottom plate 49. The one-side inclined plate 50A protrudes obliquely upward from the bottom plate 49 toward the protruding end 50C of the one-side peripheral wall plate 50A while bending at a right angle along the corner where the side 49B and side 49C of the bottom plate 49 intersect. The other-side inclined plate 50B protrudes obliquely upward from the bottom plate 49 toward the protruding end 50D of the other-side peripheral wall plate 50B while bending at a right angle along the corner where the side 49A and side 49D of the bottom plate 49 intersect. A first groove portion 59, which will be described later, is provided on the protruding end 50C of the one-side peripheral wall plate 50A, the protruding end 50D of the other-side peripheral wall plate 50B, the protruding end 51C of the one-side inclined plate 51A, and the protruding end 51D of the other-side inclined plate 51B.

The connector mounting portion 52 is provided on the one-side peripheral wall plate 50A. The connector 47 provided on the second board 46 is attached to the connector mounting portion 52 (see FIG. 10). The connector mounting portion 52 is formed as an isosceles trapezoid recess by cutting the one-side peripheral wall plate 50A from the protruding end 50C toward the bottom plate 49 in a trapezoidal shape, with the protruding end 50C being the widest and the width narrowing as it moves away from the protruding end 50C. The protruding end 52A of the connector mounting portion 52 protruding from the bottom plate 49 is formed with a trapezoidal recess 52B that is similar in shape to but slightly larger than the trapezoidal protrusion 47F of the connector 47 attached to the second board 46. The trapezoidal recess 52B engages with the trapezoidal protrusion 47F of the connector 47.

The second housing frame 53 includes a square bottom plate 54, a peripheral wall plate 55 protruding from the bottom plate 54, an inclined plate 56 provided between the bottom plate 54 and the peripheral wall plate 55, and a connector mounting portion 57, and has the same shape as the first housing frame 48.

The bottom plate 54 is formed in a square flat plate shape surrounded by four mutually perpendicular sides 54A, 54B, 54C, 54D. A plurality of screw seats 54F protrude from the upper surface 54E of the bottom plate 54, and the second board 46 is supported by the screw seats 54F when the bolts 45 inserted into the second board 46 are screwed into the screw seats 54F. Bottom plate side brackets 54G protrude from each of the two adjacent sides 54A, 54B of the bottom plate 54.

The peripheral wall plate 55 protrudes vertically from two adjacent sides 54C, 54D of the bottom plate 54. The peripheral wall plate 55 has a first peripheral wall plate 55A extending along the side 54C and an opposite peripheral wall plate 55B extending along the side 54D, and covers the periphery of the second substrate 46 supported by the screw seat 54F of the bottom plate 54. The protruding end 55C of the first peripheral wall plate 55A and the protruding end 55D of the opposite peripheral wall plate 55B are set to have the same protruding length from the upper surface 54E of the bottom plate 54, and the first peripheral wall plate 55A is formed with a connector attachment portion 56. The first peripheral wall plate 55A and the opposite peripheral wall plate 55B each have a peripheral wall plate bracket 55E protruding therefrom.

The inclined plate 56 is provided between the peripheral wall plate 55 and the bottom plate 54. The inclined plate 56 is composed of a one-side inclined plate 56A provided between the one-side peripheral wall plate 55A and the bottom plate 54, and an other-side inclined plate 56B provided between the other-side peripheral wall plate 55B and the bottom plate 54. The one-side inclined plate 56A is bent at a right angle along the corner where the side 54B and the side 54C of the bottom plate 54 intersect, and protrudes from the bottom plate 54 toward the protruding end 55C of the one-side peripheral wall plate 55A so as to be inclined obliquely upward. The other-side inclined plate 56B is bent at a right angle along the corner where the side 54A and the side 54D of the bottom plate 54 intersect, and protrudes from the bottom plate 54 toward the protruding end 55D of the other-side peripheral wall plate 55B so as to be inclined obliquely upward. A first groove portion 59, which will be described later, is provided on the protruding end 55C of the one-side peripheral wall plate 55A, the protruding end 55D of the other-side peripheral wall plate 55B, the protruding end 56C of the one-side inclined plate 56A, and the protruding end 56D of the other-side inclined plate 56B.

The connector mounting portion 57 is provided on the one side peripheral wall plate 55A. The connector 44 provided on the first board 43 is attached to the connector mounting portion 57. The connector mounting portion 57 is formed as an isosceles trapezoid recess by cutting the one side peripheral wall plate 55A from the protruding end 55C toward the bottom plate 54 in a trapezoidal shape, with the protruding end 55C side being the widest and the width decreasing as it moves away from the protruding end 55C. The protruding end 57A of the connector mounting portion 57 protruding from the bottom plate 54 is formed with a trapezoidal recess 57B that is similar in shape to but slightly larger than the trapezoidal protrusion 44F of the connector 44 attached to the first board 43. The trapezoidal recess 57B engages with the trapezoidal protrusion 44F of the connector 44.

The housing seal 58 is provided at the joint between the first housing frame 48 and the second housing frame 53. The housing seal 58 includes a first groove 59, a first protrusion 60, a second groove 61, and a second protrusion 62, and provides a seal between the outside of the housing 42 and the storage space 42A.

The first groove 59 is provided on the protruding end 50C of the one-side peripheral wall plate 50A and the protruding end 50D of the other-side peripheral wall plate 50B constituting the peripheral wall plate 50 of the first housing frame 48, and on the protruding end 51C of the one-side inclined plate 51A and the protruding end 51D of the other-side inclined plate 51B constituting the inclined plate 51. As shown in FIG. 13 and FIG. 14, one end 59A of the first groove 59 is disposed at a corner portion of the one-side inclined plate 51A where the side 49B and the side 49C of the bottom plate 49 intersect. The other end 59B of the first groove 59 is disposed at a corner portion of the other-side inclined plate 51B where the side 49A and the side 49D of the bottom plate 49 intersect. The first groove 59 is connected to a trapezoidal recess 52B provided in the connector mounting portion 52 at the protruding end 50C of the one-side peripheral wall plate 50A.

The first convex portion 60 is provided on the upper surface 49E of the bottom plate 49 constituting the first housing frame 48, and on the protruding end 51C of the one-side inclined plate 51A and the protruding end 51D of the other-side inclined plate 51B constituting the inclined plate 51. The first convex portion 60 has a plate thickness approximately equal to the groove width of the first groove portion 59, and protrudes from the upper surface 49E of the bottom plate 49, the protruding end 51C of the one-side inclined plate 51A, and the protruding end 51D of the other-side inclined plate 51B. One end 60A of the first convex portion 60 is disposed at the corner where the side 49B and the side 49C of the bottom plate 49 of the one-side inclined plate 51A intersect, and the other end 60B of the first convex portion 60 is disposed at the corner where the side 49A and the side 49D of the bottom plate 49 of the other-side inclined plate 51B intersect. That is, the corner where side 49B and side 49C of bottom plate 49 of one side inclined plate 51A intersect, and the corner where side 49A and side 49D of bottom plate 49 of the other side inclined plate 51B intersect, each form the boundary between first groove portion 59 and first protrusion portion 60.

The second groove 61 is provided at the protruding end 55C of the one-side peripheral wall plate 55A and the protruding end 55D of the other-side peripheral wall plate 55B constituting the peripheral wall plate 55 of the second housing frame 53, and at the protruding end 56C of the one-side inclined plate 56A and the protruding end 56D of the other-side inclined plate 56B constituting the inclined plate 56. One end 61A of the second groove 61 is disposed at a corner of the one-side inclined plate 56A where the side 54B and the side 54C of the bottom plate 54 intersect. The other end 61B of the second groove 61 is disposed at a corner of the other-side inclined plate 56B where the side 54A and the side 54D of the bottom plate 54 intersect. The second groove 61 is connected to a trapezoidal recess 57B provided in the connector mounting portion 57 at the protruding end 55C of the one-side peripheral wall plate 55A.

The second convex portion 62 is provided on the upper surface 54E of the bottom plate 54 constituting the second housing frame 53, and on the protruding end 56C of the one-side inclined plate 56A and the protruding end 56D of the other-side inclined plate 56B constituting the inclined plate 56. The second convex portion 62 has a plate thickness approximately equal to the groove width of the second groove portion 61, and protrudes from the upper surface 54E of the bottom plate 54, the protruding end 56C of the one-side inclined plate 56A, and the protruding end 56D of the other-side inclined plate 56B. One end 62A of the second convex portion 62 is disposed at the corner portion of the one-side inclined plate 56A where the side 54B and the side 54C of the bottom plate 54 intersect, and the other end 62B of the second convex portion 62 is disposed at the corner portion of the other-side inclined plate 56B where the side 54A and the side 54D of the bottom plate 54 intersect. That is, the corner of the one-side inclined plate 56A where the sides 54B and 54C of the bottom plate 54 intersect, and the corner of the other-side inclined plate 56B where the sides 54A and 54D of the bottom plate 54 intersect, each form the boundary between the second groove portion 61 and the second protrusion portion 62.

When the first housing frame 48 and the second housing frame 53 are assembled, the second convex portion 62 of the second housing frame 53 fits into the first groove portion 59 of the first housing frame 48, and the first convex portion 60 of the first housing frame 48 fits into the second groove portion 61 of the second housing frame 53. Therefore, for example, by assembling the first housing frame 48 and the second housing frame 53 with the sealant 35 applied to the first groove portion 59 of the first housing frame 48 and the second groove portion 61 of the second housing frame 53, a housing seal portion 58 consisting of the fitting portion between the first groove portion 59 and the second convex portion 62 and the fitting portion between the second groove portion 61 and the first convex portion 60 is formed.

In this case, the first groove 59 is formed at the protruding ends 50C, 50D of the one-side peripheral wall plate 50A and the other-side peripheral wall plate 50B, which are horizontal to the bottom plate 49, and at the protruding ends 51C, 51D of the one-side inclined plate 51A and the other-side inclined plate 51B, which are inclined obliquely upward from the upper surface 49E of the bottom plate 49 toward the protruding ends 50C, 50DC. This allows the sealant 35 to be reliably held in the first groove 59, and allows sufficient sealant 35 to be filled in the fitting portion between the first groove 59 and the second protrusion 62. Similarly, the second groove 61 is formed at the protruding ends 55C, 55D of the one-side peripheral wall plate 55A and the other-side peripheral wall plate 55B, which are horizontal to the bottom plate 54, and at the protruding ends 56C, 56D of the one-side inclined plate 56A and the other-side inclined plate 56B, which are inclined obliquely upward from the upper surface 54E of the bottom plate 54 toward the protruding ends 55C, 55D. This allows the sealant 35 to be securely held within the second groove 61, and allows sufficient sealant 35 to be filled into the mating portion between the second groove 61 and the first protrusion 60.

The connector seal 63 is provided between the connector mounting portion 52 of the first housing frame 48 and the connector 47 of the second board 46, and seals the gap between them. That is, the connector seal 63 is composed of a sealant 35 provided at the fitting portion between the trapezoidal recess 52B of the connector mounting portion 52 and the trapezoidal protrusion 47F of the connector 47. The connector seal 63 is also provided between the connector mounting portion 57 of the second housing frame 53 and the connector 44 of the first board 43, and seals the gap between them. That is, the connector seal 63 is composed of a sealant 35 provided at the fitting portion between the trapezoidal recess 57B of the connector mounting portion 57 and the trapezoidal protrusion 44F of the connector 44.

As shown in FIG. 10, when the second substrate 46 is attached to the second housing frame 53, the sealant application portion 47G of the connector 47 provided on the second substrate 46 fits with a gap into the second convex portion 62 provided on the bottom plate 54 of the second housing frame 53. For this reason, the sealant application portion 47G of the connector 47 is pre-applied with the sealant 35, and the connector 47 and the bottom plate 54 are sealed by this sealant 35. Similarly, when the first substrate 43 is attached to the first housing frame 48, the sealant application portion 44G of the connector 44 provided on the first substrate 43 fits with a gap into the first convex portion 60 provided on the bottom plate 49 of the first housing frame 48. For this reason, the sealant application portion 44G of the connector 44 is pre-applied with the sealant 35, and the connector 44 and the bottom plate 49 are sealed by this sealant 35.

The controller 41 according to the second embodiment has the configuration described above, and in the controller 41 according to this embodiment, the first board 43 and the second board 46 are arranged facing each other within the storage space 42A of the single housing 42, so that the external shape can be made as small as possible.

Moreover, the first housing frame 48 and the second housing frame 53 that constitute the housing 42 are a pair of molded products formed in the same shape using a common molding die. Therefore, the first housing frame 48 and the second housing frame 53 can be molded by manufacturing one type of molding die, which also contributes to reducing the cost of the housing 42.

In addition, the bottom plate 49 of the first housing frame 48, the protruding ends 50C, 50D of the peripheral wall plate 50, and the protruding ends 51C, 51D of the inclined plate 51, and the bottom plate 54 of the second housing frame 53, the protruding ends 55C, 55D of the peripheral wall plate 55, and the protruding ends 56C, 56D of the inclined plate 56 are provided with a housing seal portion 58 including a first groove portion 59, a first convex portion 60, a second groove portion 61, and a second convex portion 62. This allows the housing seal portion 58 to seal between the outside of the housing 42 and the storage space 42A. Furthermore, a connector seal portion 63 is provided between the connector mounting portion 52 of the first housing frame 48 and the connector 47 of the second board 46, and between the connector mounting portion 57 of the second housing frame 53 and the connector 44 of the first board 43. This allows the connector seal 63 to seal between the first housing frame 48 and the connector 47, and between the second housing frame 53 and the connector 44. As a result, it is possible to prevent rainwater and the like from entering the storage space 42A of the controller 41, and to protect the first board 43, the second board 46, and the like.

In the first embodiment, the connector 15 of the first board 14 attached to the first housing frame 19 is provided with an isosceles trapezoidal protrusion 15F that is widest on the first board 14 side and narrows the further away from the first board 14. When the first housing frame 19 is combined with the second housing frame 24, the trapezoidal protrusion 15F of the connector 15 fits into the trapezoidal recess 28B of the second housing frame 24.

However, the present invention is not limited to this, and may be configured as shown in the modified example in FIG. 16. That is, the connector 15 of the first board 14 may be provided with an isosceles trapezoidal trapezoidal protrusion 15F' that is narrowest on the first board 14 side and becomes wider as it moves away from the first board 14, and when the first board 14 is attached to the first housing frame 19, the trapezoidal protrusion 15F' may be fitted into the trapezoidal recess 23B of the first housing frame 19. Similarly, the connector 18 of the second board 17 may be provided with an isosceles trapezoidal trapezoidal protrusion 18F' that is narrowest on the second board 17 side and becomes wider as it moves away from the second board 17, and when the second board 17 is attached to the second housing frame 24, the trapezoidal protrusion 18F' may be fitted into the trapezoidal recess 28B of the second housing frame 24.

In the embodiment, the controller 12 is attached integrally to the control valve 9. However, the present invention is not limited to this, and the controller 12 may be arranged independently on the upper rotating body 3.

12, 41 Controller 13, 42 Housing 13A, 42A Storage space 14, 14', 43 First board 15, 15', 18, 18', 44, 47 Connector 17, 17', 46 Second board 19, 48 First housing frame 24, 53 Second housing frame 20, 25, 49, 54 Bottom plate 21, 26, 50, 55 Peripheral wall plate 21C, 26C, 50C, 50D, 55C, 55D Protruding end 22, 27, 51, 56 Inclined plate 22A, 27A, 51C, 51D, 56C, 56D Protruding end 30, 59 First groove portion 31, 60 First convex portion 32, 61 Second groove portion 33, 62 Second convex portion 23B, 28B, 52B, 57B Trapezoidal concave portion 15F, 15F', 18F, 18F', 44F, 47F Trapezoidal convex portion

Claims (5)

A housing with an internal storage space;
two boards, each having an electronic component and a connector attached thereto, the boards being disposed facing each other in the housing space with the connector disposed outside the housing;
the housing is composed of a first housing frame and a second housing frame that are fitted together,
each of the first housing frame and the second housing frame has a bottom plate facing the board, a peripheral wall plate protruding from the bottom plate and covering the periphery of the board, an inclined plate provided between the bottom plate and the peripheral wall plate and inclined from the bottom plate toward the protruding end of the peripheral wall plate, and a connector attachment portion to which the connector is attached;
a housing seal portion for sealing between an outside of the housing and the storage space is provided on the bottom plate, the protruding end of the peripheral wall plate, and the protruding end of the inclined plate of the first housing frame and the second housing frame,
A controller characterized in that a connector seal portion that seals between the housing and the connector is provided between the connector mounting portion of the first housing frame and the second housing frame and the connector. one of the two boards is attached to the first housing frame;
the other of the two boards is attached to the second housing frame;
2. The controller according to claim 1, characterized in that, when the first housing frame and the second housing frame are combined to form the housing, the connector attached to the one board and the connector attached to the other board are positioned on different sides of the housing. The controller according to claim 1, characterized in that the housing seal part is composed of a first groove part provided on the protruding end of the peripheral wall plate and the protruding end of the inclined plate of the first housing frame, a first convex part provided on the protruding end of the inclined plate of the first housing frame and the bottom plate continuous with the first groove part, a second groove part provided on the protruding end of the peripheral wall plate and the protruding end of the inclined plate of the second housing frame and into which the first convex part fits, and a second convex part provided on the protruding end of the inclined plate of the second housing frame and the bottom plate continuous with the second groove part and into which the first groove part fits. the connector mounting portion of the first housing frame and the connector mounting portion of the second housing frame each have a trapezoidal recess portion that is wider on a protruding end side of the peripheral wall plate and narrows toward the bottom plate,
The connector is provided with a trapezoidal protrusion that rises perpendicularly to the board and fits into the trapezoidal recess,
2. The controller according to claim 1, wherein the connector seal is provided at a fitting portion between the trapezoidal recess and the trapezoidal protrusion. The controller according to claim 1, characterized in that the first housing frame and the second housing frame are a pair of molded products formed in the same shape using a common molding die.

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