JP5961486B2 - Manufacturing method of spacer - Google Patents

Description

The present invention relates to a method of manufacturing a spacer that is disposed in a storage container that houses a mechanism and a volume of liquid that is smaller than the volume of an internal space, and that can adjust the liquid level of the liquid.

For example, in a vehicle transmission, a mechanism such as a rotating member is accommodated in a case, and oil is used to lubricate or cool the mechanism.
The oil supplied to the rotating member is stored in an oil pan provided at the bottom of the internal space of the case. The oil stored in the oil pan is sucked from the suction port and sprayed on the rotating member.
Alternatively, the oil is stored at the bottom of the case, and the rotating member is partially immersed in the oil. The oil accumulated at the bottom of the case is scraped up by the rotation of the rotating member and lubricates or cools the rotating member.
After these oils are used for lubrication or cooling, they return to the bottom of the case again due to their own weight and are reused.

In order to improve the lubrication performance of the rotating member with oil, a large amount of oil may be applied to the rotating member by increasing the amount of oil and increasing the oil level.
However, if the rotating member rotates while being immersed in oil, or rotates while scooping up the oil, a driving loss occurs due to oil resistance.
In addition, when the rotating member rotates while being immersed in oil, or when the rotating member rotates while scooping up the oil, a driving loss occurs due to the resistance of the oil.
Therefore, the oil in the case should be as small as possible.

  On the other hand, if the amount of oil that accumulates on the bottom of the transmission case is reduced, when the vehicle suddenly starts, suddenly decelerates, turns sharply, or runs on a gradient road, the oil is biased in the case internal space, and the inlet for circulating the oil May be exposed from the liquid surface. When the suction port is exposed from the liquid level, the oil circulation mechanism sucks air and cannot be properly lubricated and cooled by the oil.

  Thus, in a transmission, it is necessary to achieve both reduction in driving loss and suppression of air suction. Therefore, in order to realize both reduction of drive loss and suppression of air suction, it is necessary to secure the height of the oil level when the oil is biased while lowering the height of the oil level when flat. Desired.

In the prior art, as a first countermeasure, the height of the oil surface has been secured by reducing the volume of the internal space of the case. For example, the bottom surface of the case is formed as a so-called raised bottom. In this case, the case itself must be improved, but the change of the case is limited from the viewpoint of productivity and strength.
As a second countermeasure, a baffle plate is disposed at the bottom of the case. Since the baffle plate is disposed at a position that does not interfere with the structure of the rotating member, the height is limited. Therefore, there is a limit to the effect of preventing the unevenness of oil. In addition, the weight of the baffle plate has hindered weight reduction of the entire transmission.
As a third countermeasure, a technique for replacing the internal volume of the transmission with a hollow or a filler having a specific gravity smaller than that of oil is disclosed.

Patent Document 1 discloses a filling of a transmission in which a hollow filler having a specific gravity smaller than that of lubricating oil is accommodated in an internal space of a case, and the amount of lubricating oil is reduced by raising the oil surface height using buoyancy. A material mounting structure is described.
Patent Document 2 describes a structure for reducing lubricating oil in a transmission in which a light-weight volume member having a U-shaped hollow vertical cross section is attached to a bottom surface of a casing of a manual transmission via a substrate.
Patent Document 3 describes a lightweight volume member attached to a baffle plate attached to a lower part of a casing of a transmission.
Patent Document 4 describes a transmission housing structure in which an oil level adjustment tank such as an air tank is disposed in a gap between an inner wall of a rear clutch housing and a gear.
Even if the vehicle body tilts forward on the downhill road and the oil in the transmission housing moves forward, the oil level corresponding to the volume of the oil level adjustment tank rises, so the strainer part of the suction strainer By arranging it below, air is prevented from entering the oil passage from the suction strainer.

JP 2011-112161 A JP 2003-329110 A JP 2005-140297 A JP 2004-270819 A

  In any of these prior arts, the oil level is adjusted by disposing a volume-filled spacer inside the transmission, resulting in an increase in the mass of the oil spacer. A hollow structure is adopted to prevent mass increase as much as possible, but the air enclosed in the oil spacer expands and contracts due to temperature change and prevents damage, which prevents weight reduction. It was.

The method of manufacturing a spacer of the present invention, mechanism and, the volume of the liquid is smaller than the volume of the internal space is disposed in the housing container that houses the method of the adjustable spacer the liquid level of the liquid a is a predetermined temperature of the gas as above Symbol above Symbol maximum value of the stress applied to the spacer that fluctuates by the inner and outer temperature change of the spacer is reduced, the that encapsulation process be encapsulated inside said spacer Including .
Preferably, the predetermined temperature is a temperature in the vicinity of an intermediate value between a minimum temperature of an outside air temperature assumed to be used in the mechanism and a maximum temperature of a temperature expected to increase with use of the mechanism. .
Preferably, the predetermined temperature is higher than the intermediate value.
Preferably, the spacer comprises a was formed to be hollow housing part, and a closed portion you sealing the accommodating portion, the encapsulation step, the housing part in which the gas of the predetermined temperature has been placed A vibration welding step of vibration welding the closed portion .
Preferably, the spacer has a separating wall for dividing the housing unit.
Preferably, the spacer is used in the interior space of the vehicle transmission.
Preferably, the mechanism is a driving force transmission mechanism that transmits driving in the transmission, and is a position where the liquid is immersed in the lubricating liquid only during acceleration / deceleration or turning of the vehicle on which the transmission is mounted. It is arranged.

  It is possible to make the spacer as thin as possible while securing the strength that prevents damage even if it expands and contracts due to temperature changes, with respect to the spacer that is placed in the storage container that houses the mechanism that needs lubrication, such as a transmission. is there. In addition, a spacer that is disposed in a storage container that contains a volume of liquid that is smaller than the volume of the internal space and that can adjust the liquid level of the liquid expands and contracts due to a pressure difference between inside and outside. However, it is possible to make the wall thickness as thin as possible while ensuring the strength without damage.

It is upper surface explanatory drawing of the vehicle carrying the transmission provided with the spacer which concerns on one Embodiment of this invention. It is explanatory drawing which shows typically the driving force transmission mechanism etc. of the transmission of FIG. It is explanatory drawing of the circulation mechanism of the transmission of FIG. It is explanatory drawing which shows the structure of a spacer.

(First embodiment)
FIG. 1 is an explanatory top view of a vehicle 1 equipped with a transmission 3 equipped with a spacer 80 (see FIGS. 2 and 4) according to an embodiment of the present invention. In the vehicle 1, an engine 2 and a transmission 3 are arranged at the front portion of the vehicle body 4. The vehicle 1 is, for example, a four-wheel drive vehicle. The engine 2 is, for example, a horizontally opposed engine. The transmission 3 is, for example, a continuously variable transmission.

FIG. 2 is an explanatory diagram schematically showing the driving force transmission mechanism 50 and the like of the transmission 3 of FIG.
The transmission 3 is a part of a driving force transmission device that transmits the driving force of the engine 2 to the wheels, and the driving force transmission mechanism 50 (mechanism 500) and the like are accommodated in the case 10 (storage container 100).

  The transmission 3 has a case 10 including a main case 12, an extension case 13, and an oil pan 14. The case 10 has an internal space 15. A driving force transmission mechanism 50 is disposed in the internal space 15.

  FIG. 2 shows an engine 2 and a torque converter (clutch) 5 in addition to the transmission 3. 2 includes an input shaft 21, a shaft 23, a drive pulley 41, a driven pulley 42, a driven shaft 25, a front drive gear 26, a front driven gear 27, a front output shaft 28, a drive pinion gear 29, and a rear drive gear. 31, a rear driven gear 32 and a rear output shaft 34.

  One end of the input shaft 21 is connected to the torque converter (clutch) 5. The other end is connected to one end of the shaft 23. The power output from the engine 2 is transmitted to the input shaft 21 with the torque converter (clutch) 5 closed.

  The continuously variable transmission mechanism 24 includes a drive pulley 41, a driven pulley 42, and a chain belt 43 (see FIG. 3) having a variable diameter. The drive pulley 41 is provided on the rotation axis coaxial with the shaft 23, and the driven pulley 42 is provided on the rotation axis coaxial with the driven shaft. The chain belt 43 is an annular belt and is bridged between the drive pulley 41 and the driven pulley 42. Power is transmitted between the drive pulley 41 and the driven pulley 42 by the tension of the chain belt 43.

  The power transmitted to the driven shaft 25 by the continuously variable transmission mechanism 24 is transmitted to the front driven gear 27 via the front drive gear 26 connected to the other end of the driven shaft 25.

  The front output shaft 28 is provided with a front driven gear 27 at one end, and a drive pinion gear 29 is connected to the other end. The power transmitted from the front driven gear 27 is transmitted from the front output shaft 28 to the drive pinion gear 29. The rotation of the drive pinion gear 29 is transmitted to the front wheel 52, and the front wheel 52 is driven.

  The rear output shaft 34 is provided with a rear driven gear 32 at one end and is connected to a rear wheel (not shown) at the other end. A distribution mechanism (not shown) is provided between the front driven gear 27 and the rear drive gear 31. The rear drive gear 31 rotates according to the distribution rate set in the distribution mechanism. The rotation of the rear drive gear 31 is transmitted to the rear driven gear 32 to rotate the rear output shaft 34. A rear wheel (not shown) is rotated by the rotation of the rear output shaft 34.

In FIG. 2, the driven shaft 25 and the front output shaft 28 are separated, but the driven shaft 25 may be formed in a hollow structure so that the front output shaft 28 penetrates the driven shaft 25.
Various shafts such as the input shaft 21, the shaft 23, the driven shaft 25, the front output shaft 28, and the rear output shaft 34 are rotatably supported by the case 10.

  Thus, the transmission 3 houses the case 10 as the storage container 100 and the driving force transmission mechanism 50 as the mechanism 500, and the vehicle 1 in FIG. 1 uses the transmission 3 to drive the driving force of the engine 2 to the front and rear wheels. introduce.

FIG. 3 is an explanatory diagram of an oil circulation mechanism of the transmission 3 of FIG.
3 uses an oil strainer 62, an oil feed pipe 63, a pump 64, a switching machine 65, a hydraulic device in order to use oil accumulated in the bottom of the internal space 15 in a driving force transmission member or a hydraulic device 66. 66, a feeder 67 and the like. The oil feed pipe 63 connects an oil strainer 62, a pump 64, a switching machine 65, a hydraulic device 66, and a feeder 67.
The circulation mechanism 61 circulates oil accumulated in the bottom of the internal space 15 in the transmission 3. The oil lubricates and cools rotating members such as various shafts and gears. In FIG. 3, a drive pulley 41, a driven pulley 42, and a chain belt 43 are illustrated as rotating members. The oil is used for the hydraulic device 66 of the transmission 3. The used oil is returned to the internal space 15 and collected at the bottom of the internal space 15.

The oil strainer 62 sucks oil accumulated at the bottom of the internal space 15. The oil strainer 62 is disposed at a position where the oil is immersed in the oil in a state where the oil level of the oil is stationary in the internal space 15 such as when the vehicle 1 is stopped. A suction port 69 is provided on the lower surface of the oil strainer 62. The suction port 69 is separated from the bottom surface of the internal space 15.
The pump 64 generates oil suction force. The oil sucked from the suction port 69 by the pump 64 is supplied to the switching device 65, the hydraulic device 66, and the supply device 67. The switch 65 switches the oil supply destination. The hydraulic device 66 operates, for example, under a predetermined pressure. The oil used in the switching machine 65 and the hydraulic device 66 is discharged from the drain to the internal space 15. The supplier 67 supplies the sucked oil to a rotating member such as the shaft 51 disposed in the internal space 15. The oil discharged or supplied to the internal space 15 falls to the bottom surface of the internal space 15.
The oil returned to the internal space 15 accumulates at the bottom of the internal space 15 again. A stable amount of oil is always kept at the bottom of the internal space 15.
The oil strainer 62 continues to suck oil accumulated at the bottom of the internal space 15. The oil is circulated by the circulation mechanism 61 and repeatedly used.

In FIG. 3, the lower portion of the driven pulley 42 is immersed in the liquid level S. When the driven pulley 42 rotates while being immersed in the liquid level S, oil is scattered in the internal space 15. The scattered oil is used for lubrication and cooling of rotating members such as the driven pulley 42, the drive pulley 41, the chain belt 43, the driven shaft 25, and the front output shaft 28. The scattered oil is used to lubricate and cool the rotating member, and then returns to the bottom of the internal space 15 by its own weight.
The oil circulation mechanism 61 lubricates and cools the rotating member of the transmission 3. The hydraulic device 66 operates normally under a predetermined pressure. The transmission 3 can continuously operate in a predetermined stable state.

FIG. 2 shows the oil level S. S1 indicates the oil level position when the vehicle 1 is stopped or traveling on a flat ground. S2 and S3 indicate the oil level position when the vehicle 1 starts suddenly or runs on a slope, S2 indicates the oil level position when no oil spacer is provided, and S3 indicates the oil level position when the oil spacer is arranged. Each is shown.
The rotating member of the driving force transmission mechanism 50 is sucked into the internal space of the case 10 from the suction port 69 of the oil strainer 62 disposed at the bottom of the internal space of the case 10, and lubricates each rotating member. After being used for lubrication, it will accumulate at the bottom of the transmission. If this amount of oil is too large, a drive loss occurs due to oil agitation resistance, so the amount of oil should be as small as possible.

  However, if there is too little oil, if the vehicle suddenly starts, suddenly decelerates, turns suddenly, or if the oil is biased when traveling on a slope, air will be sucked from the inlet 69 exposed from the oil surface. . When such air sucking occurs, oil is not properly sucked, which causes lubrication failure or the like and causes abnormal noise.

  Therefore, by arranging the oil spacer at a position where the oil surface is immersed in a state where the oil surface is inclined, the height of the oil oil surface can be increased even with a small amount of oil. Therefore, in the transmission 3, it is possible to reduce the amount of oil to reduce drive loss and to raise the oil level to suppress air suction from the suction port 69.

It is conceivable that the oil spacer is installed in a dead space that is essential in terms of structure, such as a gap between rotating parts that must be spaced apart, such as a joint between gears. This is preferable without changing the structure of the conventional transmission.
In addition, the oil spacer is provided not only as a volume filling member but also as an interposition member for maintaining non-contact between the members by arranging between the members that must maintain a non-contact state. Can do.

As an arrangement position of the oil spacer in the transmission 3, for example, the front output shaft 28 is surrounded between the front drive gear 26, the front driven gear 27, and the rear drive gear 31, which is the rear position of the case 10 in the case of FIG. Thus, it is arranged in a substantially U shape.
In this arrangement position, it is possible to improve the air suction resistance when the oil is biased backward in the vehicle traveling direction at the time of sudden start, acceleration or when the gradient is increased.
However, it is not limited to this position. For example, when decelerating or suddenly stopping, the oil is biased forward in the vehicle traveling direction. In order to cope with the deviation in the forward direction, it is conceivable to provide the input shaft 21 from the front. Moreover, you may provide in a side in order to respond | correspond at the time of turning.

  FIG. 4 is an explanatory view showing the structure of the spacer 80.

The spacer 80 is disposed in a storage container that stores a mechanism such as a power drive mechanism, for example, a transmission case of the transmission, and adjusts the liquid level of the lubricating liquid that lubricates the mechanism.
The spacer 80 has a hollow portion 90, and a gas having a predetermined temperature, such as air or nitrogen, is enclosed in the hollow portion 90.
The predetermined temperature of the gas to be sealed is a temperature at which the maximum value of stress applied to the spacer, which fluctuates due to temperature changes inside and outside the spacer, is reduced.

When the drive mechanism of the transmission 3 is driven, frictional heat or the like is generated by the rotation of the rotating member. Moreover, the temperature of the air or oil in the internal space 15 of the transmission 3 may rise due to conduction of heat generated in the engine 2 or the like. At this time, since the temperature outside the spacer 80 is higher than the inside of the spacer 80, the outer wall 80b and the inner wall 80d of the spacer 80 are subjected to stress on the compression side. Accordingly, it is necessary to form the spacer 80 with a thickness that is resistant to this compressive stress.
On the other hand, when the vehicle 1 rushes into a puddle, for example, the air and oil in the case are rapidly reduced. At this time, the temperature of the hollow portion 90 of the spacer 80 does not decrease immediately, so that the temperature inside the spacer 80 is relatively higher than the temperature outside. Therefore, the outer wall 80b and the inner wall 80d of the spacer 80 are subjected to stress on the expansion side. Therefore, it is necessary to form the spacer 80 with a thickness that is resistant to the expansion stress.

  Conversely, when the vehicle 1 is driven in a state where the outside air temperature is low, the temperature of the air and oil in the internal space 15 of the transmission 3 rapidly increases. On the other hand, the temperature of the gas in the spacer 80 does not rise immediately. Therefore, the spacer 80 is in a contracted state due to a high external pressure. Therefore, it is necessary to form the spacer 80 with a thickness that is resistant to the shrinkage stress.

Therefore, a gas having a predetermined temperature that minimizes the temperature difference between the inside and outside of the spacer 80 is sealed in the hollow portion 90 of the spacer 80. As a result, the fluctuation range of the compressive stress and the expansion stress requiring resistance can be reduced, and the thickness can be reduced.

The predetermined temperature is a set temperature of the gas sealed in 90 in the hollow portion of the spacer 80. For example, when the maximum temperature expected to rise with the use of the transmission 3 is 120 ° C. and the outside air temperature expected to be used is −40 ° C., a gas of 20 ° C. at normal temperature is enclosed in the spacer 80. In such a case, resistance of 100 ° C. is required.
Therefore, the temperature of the gas sealed in the spacer 80 is set to a predetermined temperature around 40 ° C., which is an intermediate value between the maximum temperature of 120 ° C. and the minimum outside air temperature of −40 ° C., and the gas is sealed. In this case, the thickness of the spacer 80 may be about 80 ° C. on both the compression side and the expansion side. Therefore, compared with the case where normal temperature gas is sealed, the resistance for 20 ° C. becomes unnecessary, and the thickness can be reduced accordingly.

  The spacer 80 is formed in a substantially U-shaped member. Any shaft of the transmission 3 is inserted into the recess 80c in a non-contact manner, and is arranged in a non-contact manner between the two gears rotating together with the shaft or on the end portion side of the outermost gear. . By disposing the shaft and the gear in a non-contact manner, the rotation of these rotating members is not hindered, and the oil circulation is not obstructed. By forming the spacer 80 in a substantially U-shape, it can be disposed so as to surround each shaft arranged in the internal space 15 of the transmission 3 from below, and a space for arranging the spacer 80 is provided separately. There is no need. Therefore, the transmission 3 is not enlarged and the shape does not need to be changed.

The spacer 80 includes a housing portion 81 formed in a hollow shape and a closing portion 82 that seals the housing portion 81.
The accommodating portion 81 is an approximately U-shaped member that includes an outer wall 81b, an inner wall 81d, an attachment portion 81f that is provided on the outer wall and attaches the spacer 80 to a member inside the transmission 3, and a hollow portion 90. It is.
The outer wall 81b and the inner wall 81d may be formed integrally, or may be formed as separate members having different stress resistances.
Although the attachment part 81f of FIG. 4 is provided in one place in the downward side of the accommodating part 81, and two places in the upper side, it is not restricted to this. The change can be made depending on the mounting part in the transmission 3. Further, the attachment portion 81f may be provided in the closing portion 82.
The closing portion 82 is a substantially U-shaped plate-like member that includes a welding surface 82a that is bonded to the welding surface 81a of the housing portion 81 by vibration welding or the like, and an outer wall 82b.
The concave portion 81c of the housing portion and the concave portion 82c of the closing portion 82 are formed in a substantially arc shape.

The spacer 80 is selected from functional plastics particularly excellent in oil resistance and strength. A fiber reinforced resin containing glass fiber or the like in the resin is suitable, but is not limited thereto.
For example, when PA66-GF30 (density 1.43 g / cm ³ ) is used as the material of the spacer 80, the volume of the material portion of the spacer 80 is about 305 cc and the mass is about 436 g.
On the other hand, when a spacer having the same volume as the spacer 80 is formed of the same material and solid, the material portion has a volume of about 591 cc and a mass of about 864 g.
Therefore, a light weight of about 410 g can be realized by making the spacer 80 have a hollow structure. In addition, the material cost can be reduced.

The spacer 80 is formed by sealing a gas at a predetermined temperature, and welding the welding surface 81 a of the housing portion 81 and the welding surface 82 a of the closing portion 82. In particular, vibration welding is preferable, and frictional heat is generated on the two welding surfaces 81a and 82b, and pressure is applied to the welding locations for welding.
The temperature of the sealed gas may increase due to frictional heat generated during vibration welding. Since it is thought that the adhesion part of the welding surface 81a and the welding surface 82a becomes weaker on the expansion side than on the compression side, it is preferable to deviate to a higher temperature side than the predetermined temperature because the strength on the expansion side can be increased. Of course, the predetermined temperature may be determined in consideration of the temperature rise due to frictional heat.

  Since the spacer 80 hermetically seals the hollow portion 90, the spacer 80 can appropriately contract and expand. Further, the oil in the transmission 3 does not enter the hollow portion 90 of the spacer 80. Therefore, the weight of the spacer 80 does not increase or the oil oil level does not drop due to the oil that has entered.

The spacer 80 may be provided with a separation wall 80e for dividing the hollow portion 90. In the spacer 80 of FIG. 4, it implements as the separation wall 81a integrally formed with the inner wall 81d of the accommodating part 81. FIG.
The separation wall 80e can improve the strength of the spacer 80 against changes in internal pressure and external pressure. Further, since the hollow portion 90 is divided into two or more rooms by the separation wall 80e, even if the outer wall 81b is lost or the welded surface is separated, for example, the compression and expansion functions of the spacer 80 are completely disabled. There is nothing. Further, the oil only enters into a part of the chamber of the hollow portion 90 and can be easily discharged, so that the oil level of the oil is not lowered.

(Second Embodiment)
In the first embodiment, the minimum temperature of the outside air temperature that is assumed to be used for the predetermined temperature of the gas sealed in the hollow portion 90 of the spacer 80, and the maximum temperature that is assumed to rise with use of the transmission 3 The temperature was in the vicinity of the intermediate value.
In the second embodiment, a gas having a predetermined temperature higher than the intermediate value is sealed. When the assumed minimum temperature and maximum temperature are the same as in the first embodiment, in the second embodiment, for example, a gas of 60 ° C. is sealed.
In a member that can be expanded and contracted, deformation by expansion is easier than deformation by contraction. Therefore, in order to prevent deformation due to expansion in the spacer 80 as well, it is preferable to increase the strength on the expansion side.
Similarly, by giving strength to the expansion side, it is possible to increase the strength of the welded portions of the accommodating portion 81 and the closing portion 82 to the expansion side. Accordingly, it is possible to avoid separation of welded portions due to expansion.

  The spacer 80 of the present application is not limited to use in the internal space of the transmission 3 mounted on the vehicle 1. For example, you may use for the cooling system etc. which prevent the heating by combustion of an internal combustion engine. In this case, it is used as a water spacer disposed in the internal space of a water jacket provided for cooling the cylinder head, the cylinder block and the like. Since the temperature in the vicinity of the cylinder head and the cylinder block becomes high, a spacer is disposed at a position opposite to the position. As a result, the entire amount of water can be reduced while increasing the cooling effect, so that warming up can be performed quickly.

In addition, the spacer of this invention can be utilized besides mechanisms and storage containers related to automobiles, such as transmissions and water jackets.
In other words, the present invention includes a superordinate concept that reduces the amount of liquid that is required while maintaining the volume and shape of the storage container of the mechanism.
It can be used not only for an acceleration / deceleration machine such as an automobile but also for a fixed type machine. For example, machine tools and cranes.
There is also a need to reduce the amount of liquid that is required for the mechanism of such an installation-type machine while keeping the volume and shape in the storage container of the mechanism.
In addition, even in the case of an installation type machine, there are cases where the installation location is inclined, etc., resulting in the same state as during acceleration or deceleration in an automobile. It is valid.
Note that the mechanism is not limited to a gear or the like, and further, the liquid is not limited to the lubricating oil, and is stored in the storage container, and the liquid is partially stored in the storage container. Any thing can be used.

(Configuration and effect of the embodiment)
The spacer of the above-described embodiment has a hollow portion, and a gas having a predetermined temperature that is fluctuated by a temperature change inside and outside the spacer and in which the maximum value of stress applied to the spacer is reduced is enclosed in the hollow portion. Therefore, it is possible to form a thin wall thickness while ensuring a strength that does not break even if it expands and contracts due to a temperature change, and it is possible to reduce the weight and material cost.
Furthermore, the spacer is filled with a gas at a predetermined temperature, which is a temperature in the vicinity of the intermediate value between the lowest temperature of the outside air temperature expected to be used and the highest temperature expected to rise with the use of the mechanism. The fluctuation range of the compressive stress and the expansion stress that require resistance is reduced, and the thickness can be reduced.
Furthermore, by enclosing a gas having a predetermined temperature higher than the intermediate value, the resistance on the expansion side is strengthened more than the contraction side, and damage to the spacer due to expansion can be avoided.
Further, since the spacer includes a hollow housing portion and a closed portion welded to the housing portion by vibration welding, the resistance on the expansion side is enhanced by frictional heat generated during vibration welding.
Furthermore, since the spacer has a separation wall that divides the accommodating portion, the strength of the spacer can be improved. Further, since the hollow portion is divided into two or more chambers by the separation wall, even if the outer wall of the spacer is lost or the welding surface is separated, the compression and expansion functions of the oil spacer may be completely disabled. Absent. Moreover, since oil only enters into a part of the chamber of the hollow portion and can be easily discharged, the oil level of the oil can be minimized.
Further, the use of the spacer in the internal space of the transmission of the vehicle can improve the air sucking resistance.
Furthermore, since the spacer is disposed at a position where it is immersed in the lubricating liquid only during acceleration / deceleration or turning of the vehicle on which the transmission is mounted, even if the lubricating liquid is biased in the transmission, the spacer is disposed on the bottom surface of the internal space of the transmission. Since the suction port of the provided oil strainer is always submerged, air absorption resistance is improved.

DESCRIPTION OF SYMBOLS 1 Vehicle 2 Engine 3 Transmission 4 Car body 10 Case (100 storage container)
50 Drive force transmission mechanism (500 mechanisms)
61 Circulation mechanism 80 Spacer 81 Storage part 82 Closure part 90 Hollow part S Liquid surface

Claims (7)

A spacer and a manufacturing method of a spacer that is disposed in a storage container that contains a volume of liquid that is smaller than the volume of the internal space and that can adjust the liquid level of the liquid ,
Production of a spacer containing a predetermined temperature of the gas, such as the maximum value before Symbol inner and according to prior Symbol spacer that fluctuates by an outer temperature change stress of the spacer is reduced, the that encapsulation process be encapsulated in the interior of the spacer Way . The predetermined temperature is a temperature in the vicinity of an intermediate value between a minimum temperature of an outside air temperature expected to be used in the mechanism and a maximum temperature of a temperature expected to increase with the use of the mechanism. The manufacturing method of the spacer of description. The method for manufacturing a spacer according to claim 2, wherein the predetermined temperature is higher than the intermediate value. The spacer is provided with a formed to be hollow housing part, and a closure portion you sealing the accommodating portion,
The method for manufacturing a spacer according to any one of claims 1 to 3, wherein the sealing step includes a vibration welding step in which the closed portion is vibration-welded to the housing portion in which the gas having the predetermined temperature is placed. . The spacer manufacturing method according to claim 4, wherein the spacer has a separation wall that divides the housing portion. The method for manufacturing a spacer according to any one of claims 1 to 5 , wherein the spacer is used in an internal space of a transmission of a vehicle. The mechanism is a driving force transmission mechanism that transmits a driving force in the transmission, and is disposed at a position where the liquid is immersed in the lubricating liquid only during acceleration / deceleration or turning of a vehicle equipped with the transmission. The manufacturing method of the spacer of Claim 6.

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