JPH05259672A - Cooling structure for high temperature heat generating electronic unit - Google Patents

Abstract

PURPOSE:To obtain a cooling structure of high temperature heat generating electronic unit assembled in the forced cooling structure by comprising a pair of high temperature heat generating electronic devices and a fan, without impeding the cooling of the other units mounted in a shelf and resulting in any fear for giving injury to person during transportation. CONSTITUTION:A cooling structure comprises a duct plate 40 consisting of a main surface plate 41 of a rectangular form which is almost equal to the end face in the exhausting side of a fan 12 in the successive stage, the lower part thereof is pivottaly supported by the rear lower part of a high temperature heat generating electronic unit 100 and is loaded allowing swaying operation thereof at the rear part of the fan 12 in the successive stage, a tensile coil spring 48 with the one end engaged with the area near the upper corner of the main surface plate 41 and the other end engaged with the side surface of the high temperature heat generating electronic unit 100 to provide the main surface plate 41 in close contact with the end face in the exhausting side of the fan 12 of the successive stage and a lower sleeve plate 42 projected to the right and left sides from the lower part of the side edge of the main surface plate 41. A bat 25 fixed to the rear face plate 22 of the shelf pushes the lower sleeve plate 42 and the main surface plate 41 is inclined so that when the high temperature heat generating electronic unit 100 is inserted for loading to the shelf, the lower sleeve plate 42 is projected forward.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling structure for a high heat generating electronic unit in which a pair of high heat generating electronic devices and a fan are combined and assembled into a forced air cooling structure.

[0002] In communication equipment, two high heat generating electronic devices such as high power amplifiers are connected in series to form an electronic unit, and such an electronic unit is mounted on a rack together with other electronic units. is there.

[0003]

2. Description of the Related Art FIG. 5 is a diagram of a conventional high heat generating electronic unit.
(A) is a perspective view, (B) is a side sectional view, FIG. 6 is a mounting view of a communication device, (A) is a perspective view, and (B) is a side sectional view.

In FIG. 5, 1-1 is a high heat generating electronic device such as a high power amplifier housed in a shallow box-shaped case, and 1-2 is a shallow box having the same shape as the high heat generating electronic device 1-1. Other high heat generating electronic devices, such as high power amplifiers, housed in the shape of a case. These two high heat generation electronic devices 1-1, 1-2
Are connected in series to form an electronic unit having a predetermined performance.

On the other hand, 2-1 is a radiator made of, for example, aluminum in which fins are arranged in parallel on the surface side of a rectangular substrate which is similar to the bottom surface of the high heat generating electronic device.
2-2 is a radiator having the same shape as radiator 2-1 in which fins are arranged in parallel on the surface side of a rectangular substrate.

Then, one high heat generating electronic device 1-1 is closely attached to the back surface of the one heat radiating body 2-1, and the other high heat generating electronic device 1-2 is attached to the other heat radiating body 2-2. It is attached closely to the back side of.

3, the length is equal to the length of the radiator 2-1 and
It is a rectangular metal plate whose width is desirably larger than twice (width of heat radiator + width of high heat generating electronic device). The high heat generating electronic devices 1-1 and 1-2 are placed outside, and the pair of heat radiators 2-1 and 2-2 face each other in parallel, and the metal plate 3 is placed on the heat radiators 2-1 and 2-2. It is fixed to the side by bridging and screwing. Also, another metal plate 3
By cross-linking to the lower surface and fixing with screws to integrate them into a rectangular tube shape having fins in the hollow portion 4, and further inserting this integrated device into a rectangular tube-shaped unit case 5 The high heat generation electronic unit 10 is constructed by assembling in the shape of.

It is to be noted that, as a prismatic heat radiator having fins arranged in the hollow portion, a high heat generating electronic unit may be constructed by mounting high heat generating electronic devices on the outer surfaces of the heat radiator facing each other. is there.

When the above-mentioned high heat generating electronic unit 10 is inserted into the rack front frame 21 and mounted on the rack, the front fan 11 is attached to the opening of the hollow portion 4 which is the front side, and the opening which is the rear side. The rear fan 12 is attached to.

The front-stage fan 11 blows air into the hollow portion 4 of the rectangular cylinder, while the rear-stage fan 12 discharges the air in the hollow portion 4 to the rear of the high heat generating electronic unit 10. A filter 11A is attached to the front surface of the pre-stage fan 11 to prevent dust from entering the high heat generating electronic unit 10 or another electronic unit.

Reference numeral 20 shown in FIG. 6 is a front frame 21 and a back plate 22,
And a left and right side plate, which is a frame of a communication device on which the high heat generating electronic unit (10) and other electronic units are mounted. A net plate 23 is attached to the ceiling of the rack 20 so that the air in the rack is discharged upward.

On the rack 20, there are a transmission power board 31 and a high frequency transmission board 3
2, high-power electronic unit 10 which is a high-power amplifier, demultiplexer 3
6, high frequency receiving board 33, intermediate frequency amplifying board 34, receiving power board 35
Are mounted in this order from the bottom to the top.

Since the high heat generating electronic unit 10 is mounted in this manner, the front stage fan 11 sucks the air on the front surface of the rack 20 as shown in FIG.
The air is blown into the hollow portion of 10 to remove heat from the fins arranged in the hollow portion, and the post-stage fan 12 sucks out the high-temperature air and discharges it to the rear of the high-heat generating electronic unit 10.

Therefore, the high heat generating electronic device mounted on the high heat generating electronic unit 10 is forcibly air-cooled.

[0015]

By the way, in the conventional cooling structure, the high temperature air discharged to the rear of the high heat generating electronic unit is arranged so as to be orthogonal to the back face plate 22 as shown in FIG. 6 (B). By being blown, the air is discharged in the vertical and horizontal directions, so that the air flow discharged backward from other electronic units housed in the rack is disturbed and the exhausted air is obstructed.

That is, there is a problem that the temperature of other electronic units mounted on the rack is increased. On the other hand, although a filter is attached to the front fan, it is not necessary to provide such a filter to the rear fan.

Therefore, there is a problem that a finger touches the blade of the rear stage fan and is injured when the high heat generating electronic unit is transported or is inserted into or removed from the rack. The present invention has been made in view of the above points, and provides a cooling structure for a high-heat-generating electronic unit that does not hinder the cooling of other units mounted on a rack and does not cause injury during transportation. The purpose is to do.

[0018]

In order to achieve the above-mentioned object, the present invention, as illustrated in FIG. 1, has a rectangular cylindrical radiator having fins in the hollow portion 4 and is provided on the opposing outer surfaces thereof, respectively. In the high heat generation electronic unit 100, which is equipped with a high heat generation electronic device, has a front fan 11 in the front opening of the hollow portion 4 and a rear fan 12 in the rear opening, and has a forced air cooling structure, A main face plate 41 which is pivotally supported by the rear lower part of the high heat generating electronic unit 100 and has a prism shape substantially equal to the exhaust side end face of 12 and is swingably mounted on the rear part of the rear fan 12.
One end is attached near the upper corner of the main face plate 41, and the other end is attached to the side surface of the high heat generation electronic unit 100.
Tension coil spring that urges the end face of the discharge side 12 closely
A duct plate (40) having a lower sleeve plate (42) protruding in the left-right direction from the lower part of the side edge of the main surface plate (41) is provided.

By inserting and mounting the high heat generating electronic unit 100 on the rack, the bar 25 fixed to the rack rear face plate 22 so as to project forward presses the lower sleeve plate 42, and the exhaust port of the rear fan 12 is discharged. The main face plate 41 is inclined in a direction in which is opened.

Alternatively, as illustrated in FIG. 2, the lower end of the rear fan 12 is pivotally supported by the rear lower part of the high heat generating electronic unit 100 and has a rectangular shape substantially equal to the exhaust side end face of the rear fan 12, and swings to the rear part of the rear fan 12. The main face plate 51 is freely mounted, and the rear part is fixed to the lower part of the left and right side edges of the main face plate 51 so as to extend in the front fan direction 11 along the left and right side faces of the high heat generation electronic unit 100. A pair of weight members 58 for urging the 51 toward the discharge side end surface of the rear fan 12 and the main face plate 51.
A duct plate (50) having a lower sleeve plate (52) protruding in the left-right direction from the lower part of the side edge thereof is provided.

By inserting and mounting the high heat generation electronic unit 100 into the rack, the bar 25 fixed to the rack rear face plate 22 so as to project forward presses the lower sleeve plate 52, and the exhaust port of the rear fan 12 is discharged. The main face plate 51 is tilted in the direction in which the opening is made.

Alternatively, as illustrated in FIG. 3, the lower end of the rear fan 12 is pivotally supported by the rear lower part of the high heat generating electronic unit 100, and the lower end of the rear fan 12 is swingable to the rear end of the high heat generating electronic unit 100. A main face plate 61 that is movably mounted, and a pair of side plates 64 whose rear portions are fixed to the left and right side edges of the main face plate 61 so as to be in close contact with the left and right side faces of the high heat generation electronic unit 100.
A pair of weight members 68 fixed to the front lower part of each side plate 64 and biasing the main surface plate 61 so as to closely contact the discharge side end surface of the rear fan 12, and left and right protruding from the lower side edge of the main surface plate 61. A duct plate 60 having a lower sleeve plate 62 is provided.

By inserting and mounting the high heat generation electronic unit 100 into the rack, the bar 25 fixed to the rack rear face plate 22 so as to project forward presses the lower sleeve plate 62, and the exhaust port of the rear fan 12 is discharged. The main face plate 61 is tilted in the direction in which the opening is made.

[0024]

According to the present invention, since the duct plate is biased toward the exhaust side of the rear fan by the tension coil spring or the weight member, the exhaust side opening of the rear fan of the high heat generating electronic unit is the main face plate of the duct plate. Is blocked by.

Therefore, the fingers do not touch the blades of the rear stage fan when the high heat generating electronic unit is transported or when the high heat generating electronic unit is inserted into or removed from the rack. Therefore, the operator is not injured with his / her finger or the like.

On the other hand, the duct plate is automatically slid about the pins by the action of the bar provided on the rack for inserting and mounting the high heat generating electronic unit, and the main face plate is inclined obliquely upward.
Therefore, the rear surface of the rear fan is opened, and the air sucked by the rear fan hits the main face plate and is redirected upward and discharged from the ceiling of the rack.

Further, the air that has risen by cooling the other electronic units mounted on the lower stage of the high heat generating electronic unit rises diagonally rearward and upward along the lower surface of the main face plate, and the rear face plate of the rack and the upper edge of the main face plate. Ascends through the space between and and is discharged from the ceiling of the rack.

Further, since the exhaust air of the high heat generating electronic unit becomes an ascending air flow by the duct plate, the static pressure on the back surface of the other electronic unit mounted on the upper stage of the high heat generating electronic unit becomes negative. Therefore, the air passing through the other electronic unit is urged to be sucked to the back side.

Since the duct plate acts as described above, it does not promote the temperature rise of the cooling of other units mounted on the rack. In the duct plate provided with the main face plate and the pair of side plates as in the third aspect of the invention, the air sucked by the rear stage fan is conditioned by the main face plate and the side plates, and all of the air is turned upward. Therefore, there is no problem in cooling the other electronic units mounted on the left and right sides of the high heat generating electronic unit.

[0030]

The present invention will be described in detail with reference to the drawings. The same reference numerals denote the same objects throughout the drawings.

FIG. 1 is a view of an embodiment of the present invention, (A) is a side view before mounting, (B) is a side view after mounting, and FIG. 2 is a view of another embodiment of the present invention (A). Is a side view before mounting, and (B) is a side view after mounting. FIG. 3 is a diagram of another embodiment of the present invention.
(A) is a side view before mounting, (B) is a side view after mounting, and FIG. 4 is a plan view of still another embodiment of the present invention.

In FIG. 1, 100 is a prismatic heat radiator in which fins are arranged in the hollow portion 4, and high heat-generating electronic devices are mounted on opposite outer surfaces of the radiator, respectively, which is housed in a prismatic unit case. High heat generation electronic unit or a pair of heat radiators combined in a square tube shape with fins inside, and high heat generation electronic devices mounted on the outside of each heat radiation body, and high heat generation housed in a square tube unit case It is an electronic unit.

When the high heat generating electronic unit 100 is inserted into the frame front frame 21 and mounted on the frame, the front stage fan 11 is attached to the opening of the hollow portion 4 which is the front side, and the rear side opening. A rear fan 12 is attached to the part.

The pre-stage fan 11 blows air into the hollow portion 4 of the rectangular cylinder, and the post-stage fan 12 discharges the air in the hollow portion 4 to the rear of the high heat generating electronic unit 100.
Further, a filter 11A is attached to the front surface of the pre-stage fan 11 to prevent dust from entering the high heat generation electronic unit 100 or another electronic unit.

Reference numeral 40 is a duct plate which is mounted on the rear portion of the high heat generating electronic unit 100 so that the upper portion swings around the lower portion as an axis. The duct plate 40 has a rectangular shape that is almost equal to the end face of the rear fan 12 on the exhaust side, and has an inner surface that is in close contact with the rear face of the rear fan 12 and a main face plate 41 that has one end in the upper left and right corners of the main face plate 41. A pair of tension coil springs 48 that are engaged with the sleeve plate 43 and the other ends are engaged with the protrusions 47 provided on both side surfaces of the high heat generation electronic unit 100.
And a lower sleeve plate protruding in the left-right direction at the bottom of the side edge of the main face plate 41.
It consists of 42 and.

Then, the high heat generating electronic unit 10 is attached to the main face plate 41.
Secure the pair of bearing members 44 so as to sandwich the side surface of 0,
The bearing member 44 is provided with a hole, the pin 45 is inserted into this hole, and the tip of the pin 45 is fixed to the side surface of the high heat generating electronic unit 100 by screwing or the like to fix the duct plate 40 to the high heat generating electronic unit 10.
It is attached to 0.

Therefore, the principal surface plate 41 can swing about the pin 45 as an axis. Since the duct plate 40 is mounted on the high heat generation electronic unit 100 as described above, the main surface plate 41 is biased by the tension coil spring 48 and is always in close contact with the discharge side end surface of the rear stage fan 12.

Therefore, when the high heat generating electronic unit 100 is transported or when the high heat generating electronic unit 100 is inserted into or removed from the rack, the fingers do not touch the blades of the rear fan. By the way, the high heat generation electronic unit 100 is mounted by being inserted into the rack from the front so that the front frame plate of the high heat generation electronic unit 100 is brought into contact with the surface of the front frame 21 of the frame and fixed to the rack by screwing or the like.

Now, when the high heat generating electronic unit 100 is inserted into the rack, the tip of the bar 25 fixed to the back plate 22 of the rack is attached to the duct plate.
It abuts the lower sleeve plate 42 of 40. When the high heat generating electronic unit 100 is further pushed into the rack, the bar 25 presses the lower sleeve plate 42 in the front direction of the rack as shown in FIG. 1 (B).

Accordingly, the duct plate 40 automatically swings around the pin 45, and the main surface plate 41 tilts obliquely upward, and the rear fan
The back of 12 opens. Therefore, when the front-stage fan 11 and the rear-stage fan 12 are driven, the air that is sent into the hollow portion 4 by the front-stage fan 11 and cools the high heat generation electronic unit 100 is sucked out from the hollow portion 4 by the rear-stage fan 12,
When it hits the main face plate 41, it is turned upward and discharged from the ceiling of the rack.

The air that has risen by cooling another electronic unit (not shown) mounted on the lower stage of the high heat generation electronic unit 100 rises diagonally upward and rearward along the lower surface of the main principal surface plate 41, and It passes through between 22 and the upper edge of the main face plate 41, rises, and is discharged from the ceiling of the rack.

In FIG. 2, reference numeral 50 is a duct plate which is mounted on the rear portion of the high heat generating electronic unit 100 so that the lower portion serves as an axis and the upper portion swings. The duct plate 50 has a rectangular shape that is substantially equal to the end surface of the rear fan 12 on the exhaust side, and has a main surface plate 51 whose inner surface is in close contact with the rear side of the rear fan 12, and a rectangular metal plate with a large plate thickness, which results in high heat generation. A pair of weight members 58 whose rear end faces are fixed to the left and right side edges of the main face plate 51 so as to be in close contact with the left and right side faces of the electronic unit 100, and a lower portion which protrudes leftward and rightward from the lower portion of the side edge of the main face plate 51. It is composed of a sleeve plate 52.

Then, the high heat generating electronic unit 10 is mounted on the main face plate 51.
A pair of bearing members 54 are fixed so as to sandwich the side surface of 0,
The bearing member 54 is provided with a hole, the pin 55 is inserted into the hole, and the tip of the pin 55 is fixed to the side surface of the high heat generating electronic unit 100 by screwing or the like to fix the duct plate 50 to the high heat generating electronic unit 10.
It is attached to 0.

Therefore, the main surface plate 51 can swing about the pin 55 as an axis. Since the duct plate 50 is mounted on the high heat generating electronic unit 100 as described above, the main surface plate 51 is biased by the weight member 58 and is always in close contact with the discharge side end surface of the rear stage fan 12.

Then, when the high heat generating electronic unit 100 is inserted into the rack, as shown in FIG. 2B, the tip of the bar 25 which is fixed to the back plate 22 of the rack and protrudes forward, causes the lower sleeve plate 52 to move. Is pressed in the front direction of the rack.

Therefore, the duct plate 50 is automatically swung about the pin 55 as an axis, the main surface plate 51 is inclined obliquely upward, and the rear surface of the rear fan 12 is opened. In addition, the high heat generation electronic unit 10
When 0 is removed from the rack, the duct plate 50 returns due to gravity acting on the weight member 58, and the main face plate 51 comes into close contact with the discharge side end face of the rear fan 12.

In FIG. 3, reference numeral 60 denotes a duct plate mounted on the rear portion of the high heat generating electronic unit 100 so that the lower portion serves as an axis and the upper portion swings. The duct plate 60 has a rectangular shape that is substantially equal to the end surface of the rear fan 12 on the exhaust side, and the main surface plate 61 whose inner surface closely contacts the rear side of the rear fan 12 and the high heat generating electronic unit 100.
So that the rear part is close to the left and right sides of the main plate 61.
A pair of substantially fan-shaped side plates 64 fixed to the left and right side edges of each of the side plates 64, a weight member 68 fixed to the front lower part of each side plate 64, and a lower sleeve plate 62 protruding in the left-right direction from the lower side edge of the main face plate 61. It is composed of.

Then, a hole is provided in the vicinity of the apex of each side plate 64, the pin 65 is inserted into this hole, and the tip end portion of the pin 65 is fixed to the side surface of the high heat generating electronic unit 100 by screwing or the like.
The duct board 60 is attached to the high heat generation electronic unit 100.

Therefore, the main face plate 61 can swing about the pin 65 as an axis. Since the duct plate 60 is mounted on the high heat generating electronic unit 100 as described above, the main surface plate 61 is biased by the weight member 68 and is always in close contact with the discharge side end surface of the rear stage fan 12.

Then, when the high heat generating electronic unit 100 is inserted into the rack, as shown in FIG. 3 (B), the tip of the bar 25 which is fixed to the back plate 22 of the rack and protrudes to the front, lower sleeve plate 62. Is pressed in the front direction of the rack.

Therefore, the duct plate 60 automatically swings around the pin 65, and the main face plate 61 whose left and right side faces are surrounded by the side plates 64 tilts obliquely upward and the rear face of the rear fan 12 opens. To do.

Accordingly, the hollow section 4 is formed by the rear stage fan 12.
The air sucked from the air is conditioned by the main plate 61 and the side plates 64, and all of the air is turned upward. Therefore, there is no problem in cooling the other electronic units mounted on both the left and right sides of the high heat generation electronic unit 100.

When the high heat generating electronic unit 100 is removed from the rack, the duct plate 60 returns due to the gravity acting on the weight member 68, and the main face plate 61 comes into close contact with the discharge side end face of the rear stage fan 12.

[0054]

As described above, according to the present invention, before being mounted on the rack, the duct plate is biased toward the exhaust side of the rear fan by the tension coil spring or the weight member, and the main face plate exhausts the rear fan. Since the side opening is closed, when carrying the high heat generating electronic unit or when inserting / removing the high heat generating electronic unit, the fingers do not touch the blades of the rear stage fan to be injured.

When the high heat generating electronic unit is mounted on the rack, the duct plate automatically slides and the main face plate tilts obliquely upward, so that the rear surface of the rear fan opens. Then, the air that has cooled the high heat generating electronic unit is discharged from the ceiling portion of the rack in a state where the air is guided by the main face plate, the direction is changed upward, and the air is conditioned.

Therefore, there is an effect that it does not hinder the cooling of other units mounted on the rack.

[Brief description of drawings]

FIG. 1 is a diagram of an embodiment of the present invention, (A) is a side view before mounting, and (B) is a side view after mounting.

FIG. 2 is a view of another embodiment of the present invention, (A) is a side view before mounting, and (B) is a side view after mounting.

FIG. 3 is a view of yet another embodiment of the present invention, (A) is a side view before mounting, and (B) is a side view after mounting.

FIG. 4 is a plan view of still another embodiment of the present invention.

FIG. 5 is a view of a conventional example, (A) is a perspective view, and (B) is a side sectional view.

FIG. 6 is a mounting view of a communication device, in which (A) is a perspective view and (B) is a side sectional view.

[Explanation of symbols]

1-1,1-2 High heat generation electronic device 2-1,2-2
Radiator 4 Hollow 5 Unit case 10,100 High heat generation electronic unit 11 Front fan 11A Filter 12 Rear fan 40,50,60 Duct plate 41,51,61
Main plate 42,52,62 Lower sleeve plate 45,55,65
Pin 48 Extension coil spring 58,68 Weight member

Claims (3)

[Claims] 1. A high-heat-generating electronic device is mounted on each of the opposing outer surfaces of a rectangular cylindrical radiator having fins in the hollow portion (4), and a pre-stage fan is installed in the front opening of the hollow portion (4). (11)
In a high heat generation electronic unit in which a rear fan (12) is attached to the opening on the back side and assembled in a forced air cooling structure, a rectangular shape approximately equal to the exhaust side end surface of the rear fan (12) and It is pivotally supported at the lower rear of the heating electronic unit (100),
A main face plate swingably mounted on the rear portion of the rear fan (12)
(41), one end of which is attached near the upper corner of the main face plate (41) and the other end of which is attached to the side surface of the high heat generating electronic unit (100).
A tension coil spring (48) for urging the end face of the rear fan (12) so as to come into close contact with the discharge side end face of the main fan, and a lower sleeve plate (42) protruding laterally from the lower part of the side edge of the main face plate (41). And a duct plate (40) consisting of, and by mounting the high heat generation electronic unit (100) on the rack, the bar fixed to the rear plate (22) of the rack so as to project forward.
A cooling structure for a high heat generating electronic unit, characterized in that (25) presses the lower sleeve plate (42) so that the main face plate (41) is inclined. 2. A rear fan (12) having a rectangular shape substantially equal to the end face on the exhaust side, the lower part of which is pivotally supported by the rear lower part of the high heat generating electronic unit (100) and is swingable to the rear part of the rear fan (12). The main face plate (51) attached to the main face plate (51) and the rear part of the main face plate (51) so as to extend in the front fan (11) direction along the left and right side surfaces of the high heat generating electronic unit (100)
A pair of weight members (58) that are fixed to the lower portions of the left and right side edges of the main face plate (51) to urge the main face plate (51) into close contact with the discharge side end face of the rear fan (12), and the main face plate (51). A lower sleeve plate (52) that protrudes leftward and rightward from the lower part of the side edge of the device is provided with a duct plate (50), and the high heat generating electronic unit (100) is inserted and mounted on a rack to project forward. Fixed to the back plate (22) of the rack
A cooling structure for a high heat generating electronic unit, characterized in that (25) presses the lower sleeve plate (52) so that the main face plate (51) is inclined. 3. A rear fan (12) having a rectangular shape substantially equal to the end face on the exhaust side, the lower part of which is pivotally supported by the rear lower part of the high heat generating electronic unit (100) and is swingable to the rear part of the rear fan (12). Mounted on the main face plate (61) and a pair of side plates whose rear portions are fixed to the left and right side edges of the main face plate (61) so as to be in close contact with the left and right side faces of the high heat generation electronic unit (100). (64) and the front and lower parts of the side plates (64) respectively, and the main plate (6
A pair of weight members (68) for urging 1) so as to closely contact the discharge side end surface of the rear fan (12), and a lower sleeve plate (left and right protruding from the lower side edge of the main face plate (61) in the left-right direction. 62) and a duct plate (60) consisting of the high heat generation electronic unit (100) is inserted into the rack and mounted, so that the bar is fixed to the rear plate (22) of the rack so as to project forward.
A cooling structure for a high heat generating electronic unit, characterized in that (25) presses the lower sleeve plate (62) so that the main face plate (61) is inclined.