JP3194342B2 - Drum for band brake - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wet band brake applied to an automatic transmission and the like, and relates to a drum for a band brake having a double drum structure including a wet multi-plate clutch.

[0002]

2. Description of the Related Art Conventionally, as a band brake drum having a double drum structure including a wet multi-plate clutch, the one described in Japanese Patent Application Laid-Open No. 55-40365 is known.

In this prior art, as shown in FIG. 12, cooling of the outer drum, whose temperature has increased due to heat generated during braking by the band brake, is automatically supplied from inside the inner drum when the brake band is released. Transmission hydraulic oil (ATF) has been ejected between the outer drum and the brake band by centrifugal force from a hole provided to penetrate both of the double drums.

[0004]

However, the above-mentioned conventional band brake drum has the following problems.

[0005] (1) The space formed by the inner peripheral surface of the outer drum and the outer peripheral surface of the inner drum is a dead end, and the lubricating oil accumulated in the space is not easily replaced, has a heat storage effect, and has a braking effect of the band brake. When the gears are not easily warmed by the heat generated at the time, but are not easily cooled, and the shift is repeated continuously, the temperature of the outer drum rises.

If lubricating oil does not enter the space between the outer drum and the inner drum, it is an air layer, and since it has a heat insulating effect, it is hardly cooled from the inner peripheral surface of the outer drum.

(2) The lubricating oil supplied to the inside of the inner drum is jetted to the lining surface of the brake band from a hole continuously penetrating the inner drum and the outer drum by centrifugal force. Therefore, if the supply amount of the lubricating oil is increased in order to increase the cooling effect from the outer drum outer peripheral surface, the lubricating oil supplied to the outer drum outer peripheral surface and the lining surface of the brake band when the brake band is fastened when the brake band is fastened when the viscosity is low. Cannot be discharged to the extent that a sufficient frictional force is generated, which may exacerbate the shift shock.

(3) At the time of complete fastening, the hole penetrating the outer drum is closed by the brake band, so that oil cannot be guided to the fastening surface, and the cooling function cannot be sufficiently exerted.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and a first object of the present invention is to provide a band brake drum having a double drum structure including a wet multi-plate clutch. The object of the present invention is to achieve both high drum cooling performance from the inner periphery of the outer drum regardless of release and avoidance of excessive supply of lubricating oil to the lining surface of the brake band.

A second object is to secure the amount of lubricating oil when the lubricating oil on the lining surface of the brake band is insufficient, in addition to the first object.

A third object, in addition to the second object, is to make the entire width of the lining wet and to obtain a cooling property of the drum from the outer periphery of the outer drum.

A fourth object is that, in addition to the first object or the second object, when the lower portion of the outer drum has a structure immersed in lubricating oil, the entire width of the lining is moistened and the drum is cooled from the outer periphery of the outer drum. Is to gain sex.

[0013]

According to the first aspect of the present invention, there is provided a band brake drum according to the present invention, wherein an outer drum which is braked by tightening a lining-attached brake band; An inner drum, which is disposed on the inner side and in which the clutch plate of the wet-type multi-plate clutch meshes, a dead-path space formed with one end closed by an inner periphery of the outer drum and an outer periphery of the inner drum, and at least one position in the inner drum When the outer drum is provided with a brake band lubricating oil supply hole, a first lubricating oil discharge hole is provided which is displaced in the circumferential direction from the lubricating oil supply hole position, and at least one or more holes are provided on the outer drum. Opened, the first lubricating oil discharge hole is connected to the drum closed side that communicates with the Characterized in that it comprises a second lubricating oil discharge hole defined location, the.

In order to achieve the first object, in the band brake drum according to the second aspect, in the band brake drum according to the first aspect, the inner drum includes:
A snap ring that substantially separates the outside of the drum opening end from the blind lane space is attached to the end of the drum opening, and a first lubricating oil discharge hole provided in the inner drum is connected to a spline tooth near the blind lane space side of the snap ring. It is characterized by being opened to the surface.

In order to achieve the second object, in the band brake drum according to the third aspect, in the band brake drum according to the first or second aspect, a second lubricating oil discharge hole provided in the outer drum. Is opened at a position where it contacts the fastening surface of the brake band.

In order to achieve the second object, in the band brake drum according to the fourth aspect, in the band brake drum according to the first or second aspect, the strap of the brake band is provided on the outer drum. An extension is provided which extends in the width direction to a position covering the second lubricating oil discharge hole.

In order to achieve the third object, in the band brake drum according to the fifth aspect, in the band brake drum according to the third or fourth aspect, an annular brake band having one cut is provided. On the inner surface near the end, a first diagonal groove is provided which starts at the band-side end corresponding to the second lubricating oil discharge hole and slopes toward the center in the circumferential direction toward the position immediately before the opposite band-side end. It is characterized by the following.

In order to achieve the fourth object, in the band brake drum according to the sixth aspect, in the band brake drum according to the first to fourth aspects, a structure is provided in which a lower portion of the outer drum is immersed in lubricating oil. In this case, a second oblique groove that is inclined with respect to the band width direction is provided on a lining surface of a portion that is lower in a state where the brake band is installed.

[0019]

The operation of the first aspect of the present invention will be described.

When lubricating oil is supplied from the inside of the inner drum,
Lubricating oil that has passed through the wet multi-plate clutch passes through a blind lane space formed in a closed state along the inner peripheral surface of the outer drum from a first lubricating oil discharge hole opened in the inner drum, and is then opened by the outer drum. After passing through the second lubricating oil discharge hole, it is discharged from the second lubricating oil discharge hole to the outer periphery of the outer drum. When a brake band lubricating oil supply hole is provided on the outer drum, the position of the lubricating oil supply hole and the first lubricating oil discharge hole are shifted from each other in the circumferential direction, so that the main lubricating oil is supplied. Similarly, the flow is a flow that passes from the first lubricating oil discharge hole to the blind lane space to the second lubricating oil discharge hole.

Therefore, the flow of the lubricating oil supplied to the inner drum is sufficiently utilized for cooling the outer drum rather than being defined as a flow passing through the dead space, so that the outer drum can be used regardless of whether the band brake is engaged or released. High cooling performance from the inner circumference of the drum is achieved.

In addition, since the lubricating oil is supplied only to the lining surface, it is not necessary to supply the lubricating oil to the lining surface of the brake band directly. Evaded,
Deterioration of friction characteristics at the initial stage of brake engagement due to excessive supply is prevented.

The operation of the invention will be described.

When lubricating oil is supplied from the inside of the inner drum,
The inner drum is provided with a snap ring at the end of the drum opening which substantially separates the outside of the end of the drum opening from the space of the blind lane, so that the lubricating oil does not easily flow toward the opening end of the drum. Therefore, most of the lubricating oil flowing from the first lubricating oil discharge hole can be effectively used for cooling the inner peripheral surface of the outer drum through the blind lane space.

In addition, since the first lubricating oil discharge hole provided in the inner drum is opened in the spline tooth surface at a position near the blind ring space side of the snap ring, the axial distance of the blind ring space can be increased, and the first ring can be removed from the vicinity of the snap ring. (2) The inner peripheral surface of the outer drum can be cooled in a wide range up to the lubricating oil discharge hole.

The operation of the invention according to claim 3 will be described.

Since the second lubricating oil discharge hole provided in the outer drum is opened at a position where the second lubricating oil discharge hole is over the fastening surface of the brake band, the second lubricating oil discharge hole is formed on the lining surface of the brake band.
An appropriate amount of lubricating oil is supplied directly from the lubricating oil discharge hole.

Therefore, when the amount of lubricating oil on the lining surface of the brake band is insufficient, such as when the band brake is fastened under a high load, the amount of lubricating oil can be ensured.

The operation of the invention will be described.

Since the strap of the brake band is provided with an extension extending in the width direction to a position covering the second lubricating oil discharge hole provided in the outer drum, the second extension is provided.
The lubricating oil discharged from the lubricating oil discharge hole is captured by the strap, and a part of the lubricating oil is supplied to the lining surface of the brake band.

Therefore, when the amount of lubricating oil on the lining surface of the brake band is insufficient, such as when the band brake is fastened under a high load, the amount of lubricating oil can be ensured.

The operation of the invention will be described.

On the inner surface near the end of the annular brake band having one cut, the band-side end corresponding to the second lubricating oil discharge hole is the starting point and moves toward the position immediately before the opposite band-side end. As a result, the first oblique groove that is inclined toward the center in the circumferential direction provides the lubricating oil over the entire width of the lining by the rotation of the outer drum.

Accordingly, the entire width of the lining is wetted, and cooling of the drum from the outer periphery of the outer drum is obtained.

The operation of the invention will be described.

The second oblique groove that is inclined with respect to the band width direction is provided on the lining surface of the lower portion in the state where the brake band is installed, so that the lubricating oil stored in the lower portion of the outer drum can be removed. With the rotation of the lining, it enters the second diagonal groove and serves to supply lubricating oil over the entire width of the lining.

Therefore, when the lower portion of the outer drum has a structure immersed in lubricating oil, the entire width of the lining can be moistened, and cooling of the drum from the outer periphery of the outer drum can be obtained.

[0038]

Embodiments of the present invention will be described below with reference to the drawings.

(First Embodiment) First, the configuration will be described.

FIG. 1 shows a first embodiment corresponding to the first aspect of the present invention.
It is sectional drawing which shows the drum for band brakes of an Example.

1 is a brake band, 2 is a strap, 3
Is a lining, 11 is an outer drum, 12 is a brake band lubricating oil supply hole, 13 is an inner drum, 14 is a first lubricating oil discharge hole, 15 is a snap ring groove, 16 is a blind lane space, 18 is a second lubricating oil discharge hole, 20 is a wet multi-plate clutch, 21 is a piston, 22 is a drive plate, 23 is a driven plate, 24 is a retaining plate, 25
Is a snap ring.

The outer drum 11 is braked by tightening the brake band 1 having the lining 3 attached to the inside of the strap 2.

The inner drum 12 is arranged inside the outer drum 11 and meshes with the driven plate 23 of the wet multi-plate clutch 20.

The dead space 16 is formed with one end closed by the inner periphery of the outer drum 11 and the outer periphery of the inner drum 12.

The first lubricating oil discharge hole 14 is formed in the inner drum 13 at at least one location, and as shown in FIG.
In the case where the lubricating oil supply hole 2 is provided, the lubricating oil supply hole 12 is disposed so as to be shifted in the circumferential direction. The diameter and number of the brake band lubricating oil supply holes 12 are set such that a sufficient frictional force is generated between the lining 3 and the outer peripheral surface of the outer drum 11 when the brake band 1 is fastened in accordance with the amount of lubricating oil supplied. It is possible to reduce the number as described above, or it is not necessary to provide at all.

The second lubricating oil discharge hole 18 is formed in the outer drum 11 at least at one or more places, and is disposed on the drum closing side which communicates with the first lubricating oil discharge hole 14 through the blind alley space 16.

Next, the operation will be described.

[Outer Drum Cooling Function] Inner Drum 1
When the lubricating oil is supplied from the inside of the inner drum 3, the lubricating oil that has passed through the wet-type multi-plate clutch 20
The second lubricating oil discharge hole 1 opened in the outer drum 11 passes through the blind lane space 16 formed in a closed state along the inner peripheral surface of the outer drum 11 from the lubricating oil discharge hole 14.
8 and the outer drum 1
1 is discharged to the outer periphery.

The outer drum 11 is provided with a brake band lubricating oil supply hole 12.
The lubricating oil supplied from the inner side of the inner drum 13 is supplied from the first lubricating oil discharge hole 14 to the brake band lubricating oil supply hole 12 It does not flow straight.

Therefore, the flow of the lubricating oil supplied into the inner drum 13 is sufficiently used for cooling the outer drum 11 by regulating the flow of the lubricating oil to the flow passing through the blind alley space 16, so that the band brake can be fastened and released. Regardless, high drum cooling performance from the inner periphery of the outer drum 11 is achieved.

[Operation of Supplying Lubricating Oil to Brake Band] A second lubricating oil discharge hole 18 serving as a lubricating oil discharge side is provided on the drum closing side of the outer drum 11 and has a structure for directly supplying the lining surface of the brake band 1. As a result, the lubricating oil supply to the lining surface is only wet enough.

Therefore, even if the amount of lubricating oil supplied is large, excessive supply of lubricating oil to the lining surface of the brake band 1 is avoided, and deterioration of the frictional characteristics at the initial stage of brake engagement due to excessive supply is prevented.

Next, the effects will be described.

(1) In a band brake drum having a double drum structure including a wet multi-plate clutch 20,
If at least one or more holes are formed in the inner drum 13 and the outer drum 11 is provided with a brake band lubricating oil supply hole 12, the first lubricating oil discharge hole 12 is displaced from the position of the lubricating oil supply hole 12. And a second lubricating oil discharge hole 18 which is opened at least at one or more places in the outer drum 11 and is provided on the drum closing side which communicates with the first lubricating oil discharge hole 12 via the blind alley space 16. , Regardless of whether the band brake is engaged or released, high drum cooling from the inner circumference of the outer drum 11,
Avoiding excessive supply of lubricating oil to the lining surface of the brake band 1 can also be achieved.

(Second Embodiment) First, the configuration will be described.

FIG. 2 shows a second embodiment according to the present invention.
FIG. 3 is a cross-sectional view illustrating a band brake drum according to an embodiment, and FIG. 3 is a cross-sectional view illustrating a first lubricating oil discharge hole portion of the band brake drum according to a second embodiment.

The inner drum 13 of the second embodiment has
A snap ring 25 that substantially separates the outside of the drum opening end from the blind alley space 16 has a snap ring groove 1 at the end of the drum opening.
5 is attached.

As shown in FIG. 2, a first lubricating oil discharge hole 17 provided in the inner drum 13 is formed in a spline tooth surface of the snap ring 25 at a position near the blind lane space 16 side.

Here, the first lubricating oil discharge hole 17 is a hole long enough in the axial direction so as not to be blocked by the spline of the retaining plate 24, or as shown in FIG.
Spline teeth in which the retaining plate 24 does not block the first lubricating oil discharge hole 17 and the spline teeth of the portion where the discharge hole 17 is provided are partly cut so as to secure a flow path in the axial direction. 24b (normal spline teeth 2
4a).

Since other structures are the same as those of the first embodiment, the corresponding structures are denoted by the same reference numerals and description thereof is omitted.

Next, the operation will be described.

When lubricating oil is supplied from the inside of the inner drum 13, the inner drum 13 is provided with a snap ring 25 at the end of the drum opening which substantially separates the outside of the drum opening end from the dead end space 16. Flows to the drum open end side.

Therefore, most of the lubricating oil flowing from the first lubricating oil discharge hole 17 can be effectively used for cooling the inner peripheral surface of the outer drum through the blind lane space 16.

In addition, since the first lubricating oil discharge hole 17 provided in the inner drum 13 is opened in the spline tooth surface of the snap ring 25 at a position near the blind lane space side, the blind lane which is the distance between the two discharge holes 17 and 18 is formed. The axial distance of the space 16 can be increased, and the outer peripheral surface of the outer drum can be cooled over a wide range from the vicinity of the snap ring 25 to the second lubricating oil discharge hole 18.

Next, the effects will be described.

(2) Since the first lubricating oil discharge hole 17 is formed in the spline tooth surface near the snap ring 25, the distance between the two discharge holes 17 and 18 is increased, so that the drum cooling from the inner periphery of the outer drum 11 is performed. The performance is higher than in the first embodiment.

(3) As shown in FIG. 3, the spline teeth 24b at the portion where the first lubricating oil discharge hole 17 is provided are partially (or not entirely) cut out, so that the inner drum 13 First lubricating oil discharge hole 1 from inside
7, a smooth flow of lubricating oil can be ensured.

(Third Embodiment) First, the configuration will be described.

FIG. 4 shows a third embodiment corresponding to the third aspect of the present invention.
It is sectional drawing which shows the drum for band brakes of an Example.

In the third embodiment, the second lubricating oil discharge hole 18 provided in the outer drum 11 is
It is open at the position where it hangs over the fastening surface. Here, how much of the diameter of the second lubricating oil discharge hole 18 should be applied to the fastening surface of the brake band 1 depends on the amount of lubricating oil supplied, the surface pressure of the brake band 1 when the band brake is fastened, and the groove. It is determined by balancing the lining 3 with lubricating oil according to the shape and the like, and discharging the oil film between the lining 3 and the outer drum 11 at the time of fastening to generate a frictional force.

Since the other structure is the same as that of the second embodiment, the corresponding structure is denoted by the same reference numeral and the description is omitted.

Next, the operation will be described.

The cooling of the outer drum 11 is performed from the inner peripheral surface of the outer drum 11 while the lubricating oil flowing into the blind lane space 16 from the first lubricating oil discharge hole 17 of the inner drum 13 flows to the second lubricating hole 18 of the outer drum 11. It is.

When the band brake is fastened under a high load condition, the surface pressure of the brake band 1 is high. Therefore, even if a lubricating oil supply hole is provided at the center position in the width direction of the brake band as in the prior art, the lubricating oil is supplied between the lining and the outer drum. There is almost no lubricating oil supply. Therefore, it is considered that during braking, the friction surface and the lining 3 are cooled only by the lubricating oil contained in the lining 3 before the fastening of the brake band.

Therefore, it is sufficient to supply the lubricating oil to the lining 3 when the brake band is released.
By opening the brake band 1 on the lining 3 so that an appropriate amount of lubricating oil is applied to the brake band 1.
Lining surface.

At this time, a portion 16b which does not slightly serve as a lubrication flow path remains from the second lubricating oil discharge hole 18 to the back of the drum, but will be somewhat cooled by the disturbance of the lubricating oil flow. This portion is a factor that determines the position of the second lubricating oil discharge hole 18, that is, the outer peripheral surface of the portion 16 b that does not become a flow path because of the side end portion of the brake band 1 slides with the lining 3. Therefore, there is no need to supply lubricating oil because it does not generate heat.

Next, the effects will be described.

(4) The second drum provided on the outer drum 11
Since the lubricating oil discharge hole 18 was opened at a position where the lubricating oil discharge hole 18 was over the fastening surface of the brake band 1, the lubricating oil supply hole 1
When the lubricating oil on the lining surface of the brake band 1 is insufficient, as in the case of a configuration without the lubricating oil 2, the amount of lubricating oil can be secured.

(Fourth Embodiment) First, the configuration will be described.

FIG. 5 shows a fourth embodiment corresponding to the fourth aspect of the present invention.
It is sectional drawing which shows the drum for band brakes of an Example.

In the fourth embodiment, the strap 2 of the brake band 1 is provided with an extension 2a extending in the width direction to a position covering the second lubricating oil discharge hole 18 provided in the outer drum 11.

The other components are the same as those of the second embodiment, and the corresponding components are denoted by the same reference numerals and description thereof is omitted.

Next, the operation will be described.

Although the lubricating oil cools the outer drum 11 from its inner peripheral surface as in the third embodiment, the portion 16b which is not a flow path formed in the third embodiment is omitted in this example. The cooling area of the inner peripheral surface of the outer drum 11 is maximized.

On the other hand, the lubrication of the lining surface
The lubricating oil squirted from the airbag is captured by the extension 2a of the strap 2 and a part thereof flows between the lining 3 and the outer peripheral surface of the outer drum 11.

Next, the effects will be described.

(5) Strap 2 of brake band 1
The second lubricating oil discharge hole 1 provided in the outer drum 11
8 is provided in the width direction so as to extend to a position where the brake band 8 is covered, so that the lubricating oil on the lining surface of the brake band 1 is insufficient, as in the case where the brake band lubricating oil supply hole 12 is not provided. In this case, the amount of lubricating oil can be secured.

(Fifth Embodiment) First, the configuration will be described.

FIG. 6 is a sectional view showing a band brake apparatus to which the band brake drum of the embodiment is applied, and FIG. 7 is used in combination with the drum of the third embodiment or the fourth embodiment. FIG. 7 is a view showing the groove shape of the end portion of the brake band of the band brake drum according to the fifth embodiment viewed from the X direction in FIG.

In FIG. 7, on the inner surface of the lining near the ends 2a, 2b of the annular brake band 1 having one cut, a band-side end 2c corresponding to the second lubricating oil discharge hole 18 has a starting point 4a, 5a and the opposite band side end 2d
The first diagonal grooves 4 and 5 that are inclined toward the center in the circumferential direction toward the positions 4b and 5b immediately before the first diagonal groove, that is, the first diagonal grooves 4 and 5 are provided so that the distance between the first diagonal grooves 4 and 5 increases.

Next, the operation will be described.

When the rotation direction of the drum is A, the first diagonal groove 4 is provided, and when the rotation direction is B, one diagonal groove 5 is provided with the lubricating oil supplied to the starting point 4a or 5a. Plays the role of supplying over the entire width,
While wetting the entire width of the lining 3, the outer drum 1
1 is also cooled from the outer peripheral surface.

Next, the effects will be described.

(6) Ends 2a and 2b of brake band 1
Since the first oblique grooves 4 and 5 are provided on the inner surface of the lining in the vicinity, the entire width of the lining is moistened and the outer drum 11 is formed.
Of the drum can be obtained from the outer circumference of the drum.

(Sixth Embodiment) First, the configuration will be described.

FIG. 8 shows a sixth embodiment corresponding to the sixth aspect of the present invention.
FIG. 7 is a view showing the inner shape of the brake band of the band brake drum according to the embodiment viewed from the Y direction in FIG. 6.

When the lower part of the outer drum 11 has a structure immersed in lubricating oil, as shown in FIG.
In the lining surface of the lower part in the installation state of
The C-shaped grooves 6 and 6 (the second grooves) increase in distance from the band side ends 2f and 2f toward the position immediately before the center of the band width.
(Corresponding to an oblique groove).

Next, the operation will be described.

In the state where the brake band 1 is installed, the lining surface of the lower portion is provided with the V-shaped grooves 6 and 6 which are inclined with respect to the band width direction. When the outer drum 11 rotates, the lubricating oil enters the C-shaped grooves 6 and 6 with the rotation of the outer drum 11, as shown in FIG. It serves to supply lubricating oil over the entire width.

Therefore, when the lower portion of the outer drum 11 has a structure that is immersed in the lubricating oil, the entire width of the lining can be moistened, and cooling of the drum from the outer periphery of the outer drum 11 can be obtained.

Next, the effects will be described.

(7) Since the U-shaped grooves 6 and 6 inclined with respect to the band width direction are provided on the lining surface of the lower portion in the installation state of the brake band 1, the lower portion of the outer drum 11 is immersed in the lubricating oil. In the case of having the structure, it is possible to wet the entire width of the lining and to obtain the cooling property of the drum from the outer periphery of the outer drum 11.

(Seventh Embodiment) First, the configuration will be described.

FIG. 9 shows a seventh embodiment according to the sixth aspect of the present invention.
FIG. 7 is a view showing the inner shape of the brake band of the band brake drum according to the embodiment viewed from the Y direction in FIG. 6.

When the lower portion of the outer drum 11 has a structure immersed in lubricating oil, as shown in FIG.
A second diagonal groove 7 is provided on the inner surface of the lower part in the installation state of the second groove 7 inclining in the band width direction from one band side end 2f to the opposite band side end 2f.

Operationally, in the case of the drum rotation direction A, it becomes 7a in FIG. 9, and in the case of the drum rotation direction B, it becomes 7b in FIG. 9, which is the same as in the sixth embodiment.

(Eighth Embodiment) First, the configuration will be described.

FIG. 10 is a view showing the inner shape of the brake band of the band brake drum according to the eighth embodiment of the present invention viewed from the Y direction in FIG.

When the lower portion of the outer drum 11 has a structure immersed in the lubricating oil, as shown in FIG. 10, X grooves 8 which cross each other are provided on the inner surface of the lower portion when the brake band 1 is installed. A lubricating oil supply hole 9 penetrating to the strap 2 is formed in the portion.

Operationally, the lubricating oil is supplied from the lubricating oil supply hole 9.
a, 8b in FIG. 10 for the drum rotation direction B, which is the same as in the sixth embodiment.

(Ninth Embodiment) First, the configuration will be described.

FIG. 11 is a view showing the inner shape of the brake band of the band brake drum according to the ninth embodiment of the present invention viewed from the Y direction in FIG.

When the lower portion of the outer drum 11 has a structure immersed in lubricating oil, as shown in FIG. 11, a y-groove 10 having a cross portion is provided on the inner surface of the lower portion when the brake band 1 is installed. A lubricating oil supply hole 9 penetrating to the strap 2 is formed in the cross portion.

Operationally, the lubricating oil is supplied from the lubricating oil supply hole 9.
0a and the drum rotation direction B is 10b in FIG. 11, which is the same as in the sixth embodiment.

Although the embodiment has been described with reference to the drawings, the specific configuration is not limited to the embodiment, and any change or addition without departing from the gist of the present invention is included in the present invention. It is.

[0116]

According to the first aspect of the present invention, in a band brake drum having a double drum structure including a wet multi-plate clutch, one end is closed by an inner periphery of an outer drum and an outer periphery of an inner drum. And at least one place in the inner drum and a brake band lubricating oil supply hole provided in the outer drum in the circumferential direction from the lubricating oil supply hole position
A first lubricating oil discharge hole, which is displaced from the first lubricating oil discharge hole, and a second lubricating oil discharge hole, which is disposed on the drum closing side and is communicated with the first lubricating oil discharge hole through a blind alley space. With the holes, it is possible to achieve both high drum cooling from the inner circumference of the outer drum and avoiding excessive supply of lubricating oil to the lining surface of the brake band, regardless of whether the band brake is engaged or released. The effect is obtained.

In the invention according to claim 2, claim 1
In the band brake drum described above, a snap ring that substantially separates the outside of the drum opening end from the dead end space is attached to the inner drum, and the first lubricating oil discharge hole provided in the inner drum is snapped to the inner ring. Because the spline was opened on the spline tooth surface near the dead end space side of the ring,
The effect of cooling the drum from the inner periphery of the outer drum can be further enhanced.

In the invention according to claim 3, claim 1
Alternatively, in the band brake drum according to the second aspect, the second lubricating oil discharge hole provided in the outer drum is formed at a position where the second lubricating oil discharge hole is provided on the fastening surface of the brake band. The lubricating oil amount when the lubricating oil on the lining surface of the brake band is insufficient can be secured.

In the invention according to claim 4, claim 1
Alternatively, in the band brake drum according to claim 2, the strap of the brake band is provided with an extension extending in the width direction to a position covering the second lubricating oil discharge hole provided in the outer drum. And 2, the lubricating oil amount when the lubricating oil on the lining surface of the brake band is insufficient can be secured.

According to the fifth aspect of the present invention, there is provided a third aspect.
Alternatively, in the band brake drum according to claim 4, on the inner surface near the end of the annular brake band having one cut, the band-side end corresponding to the second lubricating oil discharge hole is set as a starting point and the opposite side. Since the first diagonal groove which inclines toward the center in the circumferential direction toward the position immediately before the end on the band side is provided, in addition to the effects of the third and fourth aspects, the entire width of the lining is wet and the cooling performance of the drum from the outer periphery of the outer drum is improved. Can be obtained.

According to the sixth aspect of the present invention, there is provided the first aspect.
In the band brake drum according to the present invention, in a case where the lower portion of the outer drum has a structure immersed in lubricating oil, the lining surface of the lower portion in the installation state of the brake band is inclined with respect to the band width direction.
Since the oblique groove is provided, in addition to the effects of claims 1 to 4,
When the lower part of the outer drum has a structure soaked in lubricating oil,
The effect that the entire width of the lining is moistened and that the drum can be cooled from the outer periphery of the outer drum can be obtained.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a band brake drum according to a first embodiment.

FIG. 2 is a sectional view showing a band brake drum according to a second embodiment.

FIG. 3 is an enlarged sectional view of a first lubricating oil discharge hole of a second embodiment drum.

FIG. 4 is a sectional view showing a band brake drum according to a third embodiment.

FIG. 5 is a sectional view showing a band brake drum according to a fourth embodiment.

FIG. 6 is a view showing a band brake device to which the band brake drum of the embodiment is applied.

FIG. 7 is a view showing an end of a brake band according to a fifth embodiment.

FIG. 8 is a view showing an inner surface of a lower portion of a brake band according to a sixth embodiment in an installed state.

FIG. 9 is a view showing an inner surface of a lower portion of a brake band according to a seventh embodiment in an installed state.

FIG. 10 is a view showing an inner surface of a lower part of a state in which a brake band according to an eighth embodiment is installed.

FIG. 11 is a diagram showing an inner surface of a lower portion of a ninth embodiment in a state where a brake band is installed.

FIG. 12 is a sectional view showing a conventional band brake drum.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Brake band 2 Strap 3 Lining 11 Outer drum 12 Brake band lubricating oil supply hole 13 Inner drum 14 First lubricating oil discharge hole 15 Snap ring groove 16 Dead space 18 Second lubricating oil discharge hole 20 Wet multi-plate clutch

Continuation of front page (56) References JP-A-6-294467 (JP, A) JP-A-4-69412 (JP, A) JP-A-61-10129 (JP, A) JP-A-55-40365 (JP, A) , A) Japanese Utility Model Application Sho 61-6036 (JP, U) Japanese Utility Model Application Hei 4-62434 (JP, U) Japanese Utility Model Application Utility Model No. 2-41734 (JP, U) (58) Fields surveyed (Int. Cl. ⁷ , DB Name) F16D 11/00-23/14 F16D 49/00-71/04 F16H 61/26-61/36 F16H 63/00-63/38

Claims (6)

(57) [Claims] 1. An outer drum that is braked by tightening a brake band to which a lining is attached, an inner drum that is disposed inside the outer drum and that meshes with a clutch plate of a wet multi-plate clutch, and an inner periphery of the outer drum and the inner drum A blind alley space formed with one end closed by the outer periphery of the inner drum; and a lubricating oil supply hole position opened at least at one or more locations in the inner drum and provided with a brake band lubrication oil supply hole in the outer drum. A first lubricating oil discharge hole that is arranged in the outer drum at least at one or more locations that are displaced in the circumferential direction; A second lubricating oil discharge hole; and a drum for a band brake. 2. A band brake drum according to claim 1, wherein said inner drum has a snap ring attached to an end of said inner drum, said snap ring substantially dividing an outer side of a drum opening end and said blind lane space. A band brake drum, wherein a first lubricating oil discharge hole is formed in a spline tooth surface of the snap ring at a position near a blind lane space side. 3. The band brake drum according to claim 1, wherein a second lubricating oil discharge hole provided in the outer drum is formed at a position where the second lubricating oil discharge hole is engaged with a fastening surface of the brake band. Drums for band brakes. 4. The band brake drum according to claim 1, wherein the band of the brake band is extended in a width direction to a position covering a second lubricating oil discharge hole provided in an outer drum. A drum for a band brake, characterized by having a part. 5. The band brake drum according to claim 3, wherein an inner surface near an end of the annular brake band having one cut is provided with a band side corresponding to the second lubricating oil discharge hole. A band brake drum having a first diagonal groove which is inclined from the end to the center in the circumferential direction toward the position immediately before the opposite end on the band side. 6. The band brake drum according to claim 1, wherein when the lower portion of the outer drum has a structure immersed in lubricating oil, a band is provided on a lining surface of a lower portion in a state where the brake band is installed. The second inclined with respect to the width direction
A drum for a band brake, characterized by having an oblique groove.