JP4710623B2 - Vehicle suspension system - Google Patents

Description

  The present invention relates to a vehicle suspension device that generates a damping force between an unsprung member and an unsprung member by converting a rotational force of a motor into a driving force in a linear direction by a screw mechanism.

As a vehicle suspension device, for example, Patent Document 1 includes a cylinder interposed between an unsprung portion and an unsprung portion, and a motor and a screw mechanism that enter the cylinder. 2. Description of the Related Art A vehicle suspension device that generates a damping force between an unsprung portion and an unsprung portion by converting the driving force into a linear direction is known. And FIG. 4 of this patent document 1 shows the structure where the motor was sealed with the support member and the boot.
JP 2005-98386 A

However, if the motor is hermetically sealed with the support member and the boot, the heat generated by the motor is trapped inside the support member and the boot, and there is a problem in terms of durability of the motor.
The present invention has been made in order to eliminate such inconveniences, and an object of the present invention is to provide a vehicle suspension device that can improve the durability of the motor by adopting a structure in which the heat generated by the motor is not stored. And

In order to solve the above problems, a vehicle suspension device according to the present invention includes a cylinder interposed between an unsprung portion and an unsprung portion, a motor and a screw mechanism disposed in the cylinder, and a rotational force generated by the motor. the by converting the driving force of the linear direction by the screw mechanism, in a vehicle suspension system which generates a damping force between the unsprung and on the spring, the spring above the cylinder, or of the unsprung-side A cylindrical support member for housing the motor is provided at the end, and the support member is opened toward the outer periphery of the motor, and is formed in the cylinder and outside air at predetermined intervals in the circumferential direction of the motor. a plurality of ventilation holes communicating provided a device Ru circulate air in the cylinder and out through the plurality of vents in accordance with the expansion and contraction of said cylinder.

  According to the vehicle suspension system of the present invention, the heat generated by the motor in the cylinder is dissipated by the air circulating in and out of the cylinder according to the expansion and contraction of the cylinder, so that the heat is not trapped in the cylinder. Therefore, the durability of the motor of the vehicle suspension device can be improved.

Hereinafter, a vehicle suspension apparatus according to the present invention will be described with reference to the drawings.
1 to 6 show an electromagnetic suspension which is a first embodiment of a vehicle suspension apparatus according to the present invention.
As shown in FIG. 1, the electromagnetic suspension of this embodiment is integrated with a cylindrical outer shell 2, a rod 4 inserted in the lower end side of the outer shell 2, and an upper portion of the outer shell 2. A cylinder 6 is constituted by the mount portion 10.
The mount 10 at the top of the cylinder 6 is connected to the vehicle body 14 (sprung member) via the first mounting member 12, and the rod 4 at the bottom of the cylinder 6 is unsprung via the second mounting member 16. It is connected to the member.

  The mount portion 10 has a cylindrical shape with an open top and houses a motor 18 in the internal space. A support member 20 fixed to the upper portion of the outer shell 2 and an elastic body 8a such as rubber on the inner wall. Upper support 8 which is an affixed substantially donut-shaped member, the upper edge portion of the support member 20 enters and engages in the elastic body 8a, and the outer peripheral disk portion is connected to the first mounting member 12. A boot 22 for closing the upper opening of the member 20 is provided, and the support member 20 is integrally fixed to the upper portion of the outer shell 2.

An output shaft 18a of the motor 18 extends downward, and a ball screw 26 is fixed to the output shaft 18a via a coupling 24 so that rotation of the motor 18 is transmitted to the pole screw 26. . The ball screw 26 is rotatably supported by a bearing 28 disposed on the upper inner periphery of the outer shell 2.
In addition, a bearing 30 that slidably supports the rod 4 is disposed on the inner periphery of the lower portion of the outer shell 10, and the rod 4 is disposed on the inner periphery in the axial direction of the outer shell 10 in the same manner as the bearing 30. A bearing 32 is slidably supported.

A ball screw nut 34 is disposed on the inner periphery of the upper end of the rod 4 that is accommodated in the outer shell 12. The ball screw nut 34 and the ball screw 26 are rotatably engaged via a ball (not shown).
Reference numeral 35 denotes a dust seal that prevents foreign substances such as dust from entering the outer shell 2.

2 to 4 are views showing the mount unit 10 in detail.
The motor 18 housed in the support member 20 is provided with cooling fins 36 around it.
A first ventilation hole 38 that communicates the internal space A <b> 1 of the support member 20 and the outside air is provided in the cylindrical peripheral wall 20 a of the support member 20. When the internal space partitioned by the bottom portion 20b of the support member 20 and where the coupling 24 is disposed is denoted by A2, the second ventilation hole 40 that communicates the internal space A2 and the internal space A1 is provided. A member that supports the bearing 28 is provided with a third ventilation hole 42 that allows the internal space A2 and the internal space A3 of the outer shell 2 to communicate with each other.
As shown in FIG. 3, a plurality of first ventilation holes 38 are provided at equidistant positions in the circumferential direction of the peripheral wall 20a. Further, as shown in FIGS. 3 and 4, a plurality of second ventilation holes 40 and third ventilation holes 42 are also provided at equal intervals on the circumference of a predetermined radius centered on the extension line of the axis of the support member 20. It has been.

  The electromagnetic suspension of the present embodiment converts the linear motion of the ball screw 26 and the ball screw nut 34 into the rotational motion of the ball screw 26 via the ball screw nut 34, and this rotational motion is converted into a motor via the coupling 24. 18 to the output shaft 18a. An electromagnetic force is generated by the rotation of the motor 18, and the torque that resists the rotation of the output shaft 18a of the motor 18 due to the electromagnetic force is used as a damping force that suppresses the linear motion of the ball screw 26 and the ball screw nut 34. To do. Further, by passing a current to the motor 18, torque is generated on the output shaft 18 a of the motor 18 to actively generate linear motion of the ball screw 26 and the ball screw nut 34, thereby generating a force for expanding and contracting the cylinder 6. You can also.

Here, the motor 18 generates heat when a current flows through a coil inside the motor 18 when an electromagnetic force used as a damping force is generated or when a damping force is actively generated. If the heat of the motor is trapped in the space defined by the support member 20 and the boot 22, there is a problem in terms of durability of the motor 18.
However, in the present embodiment, since the heat dissipation of the motor 18 is promoted by the expansion and contraction operation of the cylinder 6, the durability of the motor 18 can be improved.

That is, while the vehicle is traveling, the frequency of the electromagnetic suspension is increased and decreased, and the contracting operation of the cylinder 6 shown in FIG. 5 and the extending operation of the cylinder 6 shown in FIG. 6 are alternately repeated.
When the cylinder 6 contracts, as shown in FIG. 5, the inside of the cylinder 6 is sealed, so that the air in the internal space A3 passes through the third ventilation hole 42 and the coupling 24 is disposed. It flows into space A2. And since the air which flowed into internal space A2 does not go, it passes the 2nd ventilation hole 40 and flows into internal space A1 of the support member 20. FIG. The air that flows into the internal space A1 of the support member 20 is blown to the cooling fins 36 provided around the motor 18, takes the heat of the motor 18, passes through the first ventilation hole 38, and is discharged to the atmosphere.

  Further, when the cylinder 6 extends, as shown in FIG. 6, the volume of the internal space A3 expands to generate a negative pressure in the internal space A3, and air flows into the cup through the third ventilation hole 42. Air in the internal space A2 of the ring 24 is sucked into the internal space A3 of the outer shell 2. Furthermore, air is sucked into the internal space A2 of the coupling 24 from the internal space A1 of the support member 20 through the second ventilation hole 40, and the internal space of the support member 20 from the outside air through the first ventilation hole 38. Air is sucked into A1. The air flowing into the internal space A1 from the first ventilation hole 38 is blown to the cooling fins 36 provided around the motor 18, and after removing the heat of the motor 18, passes through the second ventilation hole 40 and enters the internal space A2. It flows.

  As described above, in this embodiment, the first ventilation hole 38 communicating the internal space A1 of the support member 20 and the outside air is provided in the peripheral wall 20a of the support member 20, and the internal space A2 and the internal space in which the coupling 24 is disposed. Since the second ventilation hole 40 that communicates with A1 is provided and the third ventilation hole 42 that communicates the internal space A2 and the internal space A3 of the outer shell 2 is provided, the cylinder 6 expands and contracts during traveling of the vehicle. In doing so, outside air flowing into the internal space A1 from the first ventilation hole 38 is applied to the motor 18 to take heat away, and air in the inner space A3 of the outer shell 2 flowing into the internal space A1 from the second ventilation hole 40 is removed from the motor 18. The heat dissipation effect of the motor 18 can be enhanced.

Next, FIG. 7 to FIG. 11 show an electromagnetic suspension which is a second embodiment of the vehicle suspension system according to the present invention. In addition, the same code | symbol is attached | subjected to the same component as the structure shown in FIGS. 1-6, and the description is abbreviate | omitted.
7 shows the overall configuration of the electromagnetic suspension of the second embodiment, FIG. 8 is a view taken along the line CC in FIG. 7, and FIG. 9 is an enlarged view of the internal structure of the circle indicated by the symbol K in FIG. FIG.

In the present embodiment, a check valve 52 is attached to the first ventilation hole 50 provided to communicate the internal space A1 of the support member 20 and the outside air. A fourth ventilation hole 54 communicating with the internal space A4 of the rod 3 and the outside air is provided at the lowermost part of the rod 3, and a check valve 56 is provided in the fourth ventilation hole 54.
As shown in FIG. 7, a plurality of first ventilation holes 50 are provided at equal intervals in the circumferential direction of the peripheral wall 20 a so as to face the upper position of the motor 18.

  As shown in FIG. 8, the check valve 52 attached to the first ventilation hole 50 includes a ball 52a, a spring 52b that applies a biasing force to the ball 52a toward the opening on the outside air side, And a cap 52c that has a through hole communicating with the internal space A1 and is press-fitted from the hole opening on the outside air side, and allows the inflow of air from the outside air into the internal space A1, but the internal space A1 This valve prevents air from being discharged from the outside.

Further, as shown in FIG. 9, the check valve 56 attached to the fourth ventilation hole 54 includes a ball 56a, a spring 56b that applies a biasing force to the ball 56a toward the hole opening on the outside air side, and an outside air And a cap 56c that has a through hole that communicates with the internal space A4 and is press-fitted into a hole opening on the outside air side, and allows air to be discharged from the internal space A4 to the outside air. It is a valve that prevents the inflow of air into the space A4.
Here, the urging forces of the springs 52b and 54b are set so that the valve opening pressures of the check valves 52 and 56 are lower than the pressure at which air leaks from the dust seal 35.

  When the cylinder 6 contracts, as shown in FIG. 10, the air inside the cylinder 6 (inner space A4 of the rod 3) is compressed and passes through the fourth ventilation hole 54 provided at the lowermost part of the rod 4. Discharged into the atmosphere. At that time, the air warmed by the heat radiation of the motor 18 is discharged, and at the same time, the water accumulated at the bottom of the rod 4 is also discharged. Further, since the first ventilation hole 50 is equipped with the check valve 52, the air in the internal space A1 is not discharged from the first ventilation hole 50 to the outside air.

  Further, when the cylinder 6 extends, as shown in FIG. 11, the volume of the internal space A3 expands to generate a negative pressure in the internal space A3, and the check valve 52 causes the outside air to flow through the first ventilation hole 50. Allowed to flow into the internal space 1. The air flowing into the internal space A1 from the first ventilation hole 38 is blown to the cooling fins 36 provided around the motor 18, and after passing away the heat of the motor 18, passes through the second ventilation hole 40 and the third ventilation hole 42. Then, it moves to the inside of the cylinder 6.

  As described above, in the present embodiment, when the cylinder 6 expands and contracts during traveling of the vehicle, the heat of the motor 18 is dissipated by the air sucked from the first ventilation hole 50, and the air warmed by the heat dissipated by the motor 18. Is discharged from the fourth ventilation hole 54, and the air suction port and the discharge port to the cylinder 6 are distinguished from each other so that the air flow is one-way. Therefore, the heat radiation effect of the motor 18 can be further enhanced.

Further, by providing the fourth ventilation hole 54 at the lowermost part of the rod 3, it is possible to prevent water that has entered from the first ventilation hole 50 and water droplets generated by condensation from accumulating at the bottom of the cylinder 6.
Further, since the first ventilation hole 50 for sucking outside air is provided so as to face the upper position of the motor 18, the air flowing into the internal space A 1 from the first ventilation hole 38 flows downward toward the fourth ventilation hole 54. At this time, the air is blown to the upper position of the cooling fin 36 provided around the motor 18 and the contact time with the cooling fin 36 becomes longer, so that the heat dissipation effect of the motor 18 can be further enhanced.

Next, FIG. 12 shows the electromagnetic suspension which is 3rd Embodiment of the vehicle suspension apparatus based on this invention. In addition, the same code | symbol is attached | subjected to the component same as the structure of 2nd Embodiment shown in FIGS. 7-11, and the description is abbreviate | omitted.
The electromagnetic suspension of this embodiment is different from the second embodiment in that it is opposite to the first ventilation hole 50 provided in the upper part of the peripheral wall 20a of the support member 20 so as to face the upper position of the motor 18, as shown in FIG. The check valve 52 is attached to the second ventilation hole 40 communicating with the internal space A1 and the internal space A2 without attaching the stop valve. In addition, the inner peripheral portion of the upper support 8 constituting the mount portion 10 has a shape in which the first ventilation hole 50 of the support member 20 is surrounded from the lower side.

The check valve 52 attached to the second ventilation hole 40 has the same structure as that of the second embodiment and allows air to flow from the internal space A1 to the internal space A2, but from the internal space A2 to the internal space. It is a valve that prevents the discharge of air to A1.
In the present embodiment, when the cylinder 6 is contracted, the air inside the cylinder 6 (internal space A4 of the rod 3) is compressed, passes through the fourth ventilation hole 54 provided in the lowermost part of the rod 4, and is discharged to the atmosphere. Is done. At that time, the air warmed by the heat radiation of the motor 18 is discharged, and at the same time, the water accumulated at the bottom of the rod 4 is also discharged. Further, since the second ventilation hole 40 is equipped with the check valve 52, the air in the internal space A2 does not flow into the internal space A1, so that the air in the internal space A1 passes through the first ventilation hole 50 and is outside air. Will not be discharged.

  Further, when the cylinder 6 extends, the volume of the internal space A3 expands to generate a negative pressure in the internal space A3, and the air in the internal space A2 passes through the third ventilation hole 42 and flows into the internal space A3. In addition, the check valve 52 attached to the second ventilation hole 40 allows the air in the internal space A1 to flow into the internal space A2. For this reason, the outside air flows into the internal space A1 from the first ventilation hole 38, and the air that flows into the internal space A1 is blown to the cooling fins 36 provided around the motor 18 to remove the heat of the motor 18 and then the second. It passes through the ventilation hole 40 and the third ventilation hole 42 and moves into the cylinder 6.

As described above, in the present embodiment, similarly to the second embodiment, the air suction port and the discharge port for the cylinder 6 are distinguished from each other so that the air flow is one-way. Since the contact time between the cooling fins 36 and the air that has been provided so as to face the upper position of 18 and flowed into the internal space A1 becomes longer, the heat dissipation effect of the motor 18 can be further enhanced.
Moreover, since the inner peripheral part of the upper support 8 which comprises the mount part 10 is made into the shape which encloses the 1st ventilation hole 50 of the support member 20 from the lower side, dust and a water | moisture content can be removed from the 1st ventilation hole 50. Infiltration can be prevented as much as possible.

  Here, in the second embodiment, as shown in FIG. 8, the check valve 52 attached to the first ventilation hole 50 of the support member 20 protrudes radially outward. If the position of the first ventilation hole 50 is set to the lower position so that the upper support 8 and the check valve 52 do not interfere with each other, the heat dissipation effect of the motor 18 may be impaired. is there.

  Therefore, in the present embodiment, the check valve 52 is attached to the second ventilation hole 40 communicating with the internal space A1 and the internal space A2, without attaching the check valve to the first ventilation hole 50, and the support member 20 Since no convex portion is formed on the outer periphery so that nothing interferes with the upper support 8, the shape of the upper support 8 can be given a degree of freedom and the position of the first ventilation hole 50 is set downward. Since there is no need to lower the position, the heat dissipation effect of the motor 18 can be enhanced.

  Note that the portion surrounding the first ventilation hole 50 of the support member 20 provided on the inner peripheral portion of the upper support 8 from the lower side has a smaller gap with the outer periphery of the support member 20 (reference symbol CL in FIG. 12). Greatly prevents moisture from entering. However, since the clearance CL fluctuates when the mounting angle of the cylinder 6 swings, the clearance CL must be secured as a minimum necessary clearance in order to avoid interference with the outer periphery of the support member 20.

Furthermore, FIG. 13 shows the electromagnetic suspension which is 4th Embodiment of the vehicle suspension apparatus based on this invention.
In the first to third embodiments, the member that supports the bearing 28 is provided with the third ventilation hole 42 that communicates the internal space A2 and the internal space A3. However, in the present embodiment, the coupling 24 and the ball screw 26 are provided. In addition, a third ventilation hole 54 communicating the internal space A2 and the internal space A3 is provided.

The third vent hole 54 of the present embodiment is a hollow provided in the axial center of the ball screw 26 so as to communicate with the radial hole 24a provided in a direction orthogonal to the rotation axis of the coupling 24 and the radial hole 24a. It is comprised with the hole 26a.
In the present embodiment as well, the third ventilation hole 54 including the radial hole 24a of the coupling 24 and the hollow hole 26a of the ball screw 26 communicates with the internal space A2 and the internal space A3, so that the same as in the third embodiment. An effect can be obtained.

  Further, the diameter of the outer shell is small, the diameter of the bearing 28 that supports the ball screw 26 rotatably is set large, and it is difficult to provide the third ventilation hole in the member that supports the bearing 28. However, in the present embodiment, the layout of the third ventilation hole 54 can be improved by effectively using the coupling 24 and the ball screw 26.

It is a figure which shows the vehicle suspension apparatus of 1st Embodiment which concerns on this invention. It is a figure which shows the part incorporating the motor of the vehicle suspension apparatus of 1st Embodiment. It is an AA arrow directional view of FIG. It is a BB line arrow directional view of FIG. It is a figure which shows the shrinking operation | movement of the cylinder in 1st Embodiment. It is a figure which shows the expansion | extension operation | movement of the cylinder in 1st Embodiment. It is a figure which shows the vehicle suspension apparatus of 2nd Embodiment which concerns on this invention. It is CC line arrow line view of FIG. It is a figure which shows the structure of the round mark shown with the code | symbol K of FIG. It is a figure which shows the shrinking operation | movement of the cylinder in 2nd Embodiment. It is a figure which shows the expansion | extension operation | movement of the cylinder in 2nd Embodiment. It is a figure which shows the part incorporating the motor of the vehicle suspension apparatus of 3rd Embodiment which concerns on this invention. It is a figure which shows the vehicle suspension apparatus of 4th Embodiment which concerns on this invention.

Explanation of symbols

2 Outer shell 4 Rod 6 Cylinder 8 Upper support 10 Mount portion 12 First mounting member 14 Car body 16 Second mounting member 18 Motor 20 Support member 22 Boot 24 Coupling 24a Radial hole 26 Ball screw 26a Hollow hole 34 Ball screw nut 36 Cooling fins 38, 50 First ventilation hole 40 Second ventilation hole 42 Third ventilation hole 52 Check valve 54 Fourth ventilation hole 56 Check valves A1, A2, A3, A4 Internal space

Claims (8)

A cylinder interposed between the unsprung and unsprung parts, a motor and a screw mechanism disposed in the cylinder, and by converting the rotational force by the motor into a linear driving force by the screw mechanism, in a vehicle suspension system which generates a damping force between the unsprung and on the spring,
A cylindrical support member that houses the motor is provided on the upper or lower end of the cylinder.
The support member is provided with a plurality of ventilation holes that open toward the outer periphery of the motor and communicate the inside and outside air of the cylinder formed at a predetermined interval in the circumferential direction of the motor,
Vehicle suspension system, characterized in that Ru circulate air in the cylinder and out through the plurality of vents in accordance with the expansion and contraction of said cylinder. The plurality of ventilation holes provided in the support member are the intake ventilation holes that communicate the inside of the cylinder and the outside air ,
2. The vehicle suspension apparatus according to claim 1, wherein the exhaust ventilation hole that communicates the inside of the cylinder and the outside air is provided at a position separated from the motor.   The vehicle suspension system according to claim 2, wherein a check valve that allows only an air flow from outside air into the cylinder is attached to the intake vent hole. In the cylinder, a partition for dividing the motor and the screw mechanism into separate rooms is provided, and a ventilation hole is provided for communicating the room in which the motor is arranged and the room in which the screw mechanism is arranged. vehicle suspension system according to claim 2 or 3, wherein the fitted with a check valve which allows only the flow of air to the room placed the screw mechanism from the room which is disposed said motor.   The vehicle suspension system according to any one of claims 2 to 4, wherein a check valve that allows only an air flow from the inside of the cylinder to the outside air is attached to the exhaust ventilation hole. The vehicle suspension device according to any one of claims 2 to 5, wherein the motor is disposed at an upper portion of the cylinder , and the exhaust ventilation hole is provided at a lowermost portion of the cylinder.   The screw mechanism is composed of a ball screw that is rotatably connected to the motor and a ball screw nut that is rotatably connected to the ball screw, and a hollow hole is provided in an axis of the ball screw, The vehicle suspension device according to any one of claims 1 to 6, wherein the hollow hole is a bypass passage through which air flows toward the ventilation hole. 8. A portion surrounding the outer periphery of the plurality of ventilation holes provided in the support member with a gap is provided in a mount portion on the upper or lower spring side of the cylinder. The vehicle suspension device according to any one of the above.

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