Casing manufacturing method

Abstract

To suppress intrusion of water to an inner side with respect to a joint surface in supplying a liquid gasket and water to the joint surface of a first casing and a second casing.SOLUTION: A manufacturing method of a casing for manufacturing the casing having a hollow space inside by joining a first casing and a second casing includes: a first step of applying a water-curable liquid gasket along a joint part of the first casing and the second casing in a cross-sectional shape including a wall-like part; a second step of applying water to an outer part with respect to the wall-like part of the applied liquid gasket; and a third step of joining the first casing and the second casing by bringing the first casing and the second casing close to each other and crushing and hardening the applied liquid gasket with the water.SELECTED DRAWING: Figure 7

Description

Technical Field

[0001] The present invention relates to a method for manufacturing a casing. Background Art

[0002] Conventionally, automobiles are provided with a casing for accommodating components of a drive transmission system that transmits the driving force of an engine. The casing is manufactured, for example, by joining a first casing and a second casing, and a hollow space for accommodating the components of the drive transmission system is formed inside the joined first casing and second casing.

[0003] Lubricating oil for preventing damage to each component of the drive transmission system is introduced into the hollow space in the casing. In order to prevent lubricating oil from leaking from the joint surface between the first casing and the second casing, a liquid gasket as a sealing material is applied to the joint surface. However, in order to cure the liquid gasket and exert the sealing function of the joint surface, a certain curing time is required after the application of the liquid gasket.

[0004] Patent Document 1 discloses supplying water to a liquid gasket in order to shorten the curing time of the liquid gasket. In Patent Document 1, curing of the liquid gasket is promoted by applying the liquid gasket to a sealing surface and spraying fine moisture onto the surface of the applied liquid gasket. Prior Art Documents Patent Documents

[0005] Patent Document 1 Japanese Unexamined Patent Application Publication No. 2008-55257 Summary of the Invention Problem to be Solved by the Invention

[0006] However, as mentioned above, lubricating oil is introduced into the hollow space within the casing. When the technology described in Patent Document 1 is applied to the joint surface of the first and second casings of such a casing, some of the fine moisture may penetrate inward beyond the joint surface, potentially mixing with the lubricating oil in the hollow space. Thus, when supplying liquid gasket and water to the joint surface of the first and second casings, if water penetrates inward beyond the joint surface, it may adversely affect the lubricating oil provided in the hollow space.

[0007] Therefore, the present invention aims to provide a method for manufacturing a casing that can suppress the intrusion of water into the interior of the joint surface when supplying liquid gasket and water to the joint surface of the first casing and the second casing. [Means for solving the problem]

[0008] To solve the above problems, a method for manufacturing a casing according to one embodiment of the present invention is: In a method for manufacturing a casing, in which a casing having a hollow space inside is manufactured by joining a first casing and a second casing, A first step involves applying a water-curable liquid gasket along the joint between the first casing and the second casing, in a cross-sectional shape that includes a wall-like portion. A second step involves applying water to the portion of the applied liquid gasket that is outside the wall-like portion, A third step involves bringing the first casing and the second casing close together and crushing the applied liquid gasket together with the water to harden it, thereby joining the first casing and the second casing; Includes. [Effects of the Invention]

[0009] According to the present invention, when supplying liquid gasket and water to the joint surface of the first casing and the second casing, it is possible to suppress the intrusion of water into the area inside the joint surface. [Brief explanation of the drawing]

[0010] [Figure 1] Figure 1 is a schematic diagram showing the configuration of the vehicle according to this embodiment. [Figure 2] Figure 2 is a schematic cross-sectional view showing the overall configuration of the casing according to the same embodiment. [Figure 3] Figure 3 is a partial cross-sectional view showing the detailed configuration of the joint portion of the casing according to the same embodiment. [Figure 4] Figure 4 is a schematic cross-sectional view showing the first step of applying an uncured liquid gasket to the first joint portion according to the embodiment. [Figure 5] Figure 5 is a schematic cross-sectional view showing the second step of adding water to the liquid gasket according to the same embodiment. [Figure 6] Figure 6 is a schematic cross-sectional view showing the third step of joining the first casing and the second casing according to the same embodiment. [Figure 7] Figure 7 is a flowchart of the manufacturing method of the casing according to the same embodiment. [Figure 8] Figure 8 is a schematic top view of the second casing showing the application of uncured liquid gasket using the coating machine according to the same embodiment. [Figure 9] Figure 9 is a schematic side view of the nozzle of the coating machine according to the same embodiment, viewed from the side. [Modes for carrying out the invention]

[0011] Embodiments of the present invention will be described in detail below with reference to the attached drawings. The specific dimensions, materials, numerical values, etc., shown in these embodiments are merely examples to facilitate understanding of the invention and do not limit the present invention unless otherwise specified. In this specification and drawings, elements having substantially the same function and configuration are denoted by the same reference numerals to avoid redundant explanations, and elements not directly related to the present invention are omitted from the illustrations.

[0012] Fig. 1 is a schematic configuration diagram showing the configuration of a vehicle 100 according to the present embodiment. As shown in Fig. 1, the vehicle 100 includes an engine 200, a power transmission device 300, and wheels 400. The engine 200 is a prime mover that causes the vehicle 100 to travel, and consumes fuel to generate a driving force that acts on the wheels 400 of the vehicle 100. However, the vehicle 100 may be a hybrid vehicle that can travel using the driving force of the engine 200 and the driving force of a traveling motor, or may be an electric vehicle that can travel using only the driving force of a traveling motor.

[0013] The power transmission device 300 is provided in a power transmission path from the engine 200 to the wheels 400. The power transmission device 300 includes, for example, a torque converter 310, a forward / reverse switching mechanism 320, and a CVT (Continuously Variable Transmission) 330.

[0014] The torque converter 310 has a clutch function and a torque amplification function, and is connected to a crankshaft 210 of the engine 200. The torque converter 310 includes a lock-up clutch (not shown). When the lock-up clutch is in an unlocked state, the torque converter 310 amplifies torque, which is the driving force of the engine 200, and transmits the amplified torque to an output shaft 340. Further, when the lock-up clutch is in a locked-up state, the torque converter 310 transmits the driving force of the engine 200 directly to the output shaft 340.

[0015] The forward / reverse switching mechanism 320 switches between a forward state in which torque transmitted from the output shaft 340 is transmitted to a primary shaft 350 without changing the direction thereof, and a reverse state in which torque transmitted from the output shaft 340 is transmitted to the primary shaft 350 with the direction reversed. For example, the forward / reverse switching mechanism 320 is configured by a double-pinion type planetary gear mechanism.

[0016] The CVT 330 is a transmission that can continuously and continuously change the speed of the driving force of the engine 200 and output the same. The CVT 330 includes a primary pulley (not shown) connected to a primary shaft 350, a secondary pulley (not shown) connected to a secondary shaft 360, and a winding member (not shown) wound around the primary pulley and the secondary pulley. The winding member is, for example, a belt, a chain, or the like.

[0017] The primary pulley and the secondary pulley are configured such that the width of the groove around which the winding member is wound can be changed. Specifically, by increasing the width of the groove around which the winding member is wound, the winding radius of the winding member is reduced. Conversely, by reducing the width of the groove around which the winding member is wound, the winding radius of the winding member is increased. In this way, by changing the winding radius of the winding member, the driving force of the engine 200 is continuously and continuously changed in speed.

[0018] The secondary shaft 360 is connected to wheels 400 via drive transmission members (not shown) such as a reduction gear, a differential gear, and a drive shaft. The driving force transmitted to the secondary shaft 360 is transmitted to the wheels 400 via such drive transmission members. As a result, a driving force is generated at the contact surface of the wheels 400 with the road surface, allowing the vehicle 100 to travel.

[0019] A power transmission device 300 includes a casing 500 that houses a torque converter 310, a forward / reverse switching mechanism 320, and the CVT 330. The casing 500 according to the present embodiment is, for example, a casing for a drive transmission member that houses components of a drive transmission system.

[0020] Figure 2 is a schematic cross-sectional view showing the overall configuration of the casing 500 according to the present embodiment. As shown in Figure 2, the casing 500 is a container having a hollow space S therein. The hollow space S of the casing 500 houses, for example, the torque converter 310, the forward / reverse switching mechanism 320, the constituent components of the CVT 330, and lubricating oil for preventing damage to the constituent components, etc.

[0021] From the viewpoint of ease of manufacturing, the casing 500 is manufactured by joining multiple parts. In this embodiment, for example, the casing 500 is manufactured by joining two parts (for example, a first casing 510 and a second casing 520), but the casing 500 may also be manufactured by joining three or more parts.

[0022] As shown in Figure 2, the casing 500 according to this embodiment comprises a first casing 510, a second casing 520, and a liquid gasket 530. The first casing 510 is provided above the second casing 520, and the second casing 520 is provided below the first casing 510.

[0023] The liquid gasket 530 is provided between the joint portion 512, which is the joining surface of the first casing 510, and the joint portion 522, which is the joining surface of the second casing 520. The joint portion 512 of the first casing 510 is the portion that joins the joint portion 522 of the second casing 520 via the liquid gasket 530. The joint portion 522 of the second casing 520 is the portion that joins the joint portion 512 of the first casing 510 via the liquid gasket 530. The liquid gasket 530 is a sealing material that joins the joint portion 512 of the first casing 510 and the joint portion 522 of the second casing 520, and seals the space between the joint portion 512 of the first casing 510 and the joint portion 522 of the second casing 520. The liquid gasket 530 in this embodiment is a water-curable material, for example, a silicon-based FIPG (Formed In Place Gasket).

[0024] The first casing 510 and the second casing 520 are joined by a liquid gasket 530, sealing the joint portion 512 of the first casing 510 and the joint portion 522 of the second casing 520, and forming a casing 500 having a hollow space S inside. This hollow space S inside the casing 500 is sealed. However, the hollow space S does not have to be a completely sealed space; for example, a gap or vent is provided in a part of the casing 500, and it may be a space that has a part that communicates with the outside space. In this way, the first casing 510 and the second casing 520 are joined by a liquid gasket 530, and a hollow space S is formed inside the casing 500.

[0025] Figure 3 is a partial cross-sectional view showing the detailed configuration of the joint portion of the casing 500 according to this embodiment. As shown in Figure 3, the first casing 510 has a joint portion 512 that is joined to the second casing 520 via a liquid gasket 530. The joint portion 512 is, for example, planar in shape. The second casing 520 also has a joint portion 522 that is joined to the first casing 510 via a liquid gasket 530. The joint portion 522 includes a first joint portion 522a and a recess 522b which is the second joint portion. In this embodiment, the recess 522b is provided in the joint portion 522, but the embodiment is not limited to this, and the recess 522b may also be provided in the joint portion 512. Furthermore, the recess 522b may be provided in both the joint portion 512 and the joint portion 522.

[0026] The first joint portion 522a is positioned closer to the joint portion 512 of the first casing 510 than the recess 522b, which is the second joint portion. Also, the first joint portion 522a is located outside the casing 500 than the recess 522b. The first joint portion 522a is, for example, a planar shape and a surface parallel to the joint portion 512 of the first casing 510. The first joint portion 522a is the part to which the uncured liquid gasket 530 is applied before joining the first casing 510 and the second casing 520, as will be described in more detail later.

[0027] The recess 522b is recessed on the side away from the joint portion 512 of the first casing 510 relative to the first joint portion 522a. The recess 522b is located inside the casing 500 compared to the first joint portion 522a. A hollow space S is formed inside the casing 500.

[0028] The first joint portion 522a is the portion of the joint portion 522 of the second casing 520 that is closest to the joint portion 512 of the first casing 510. The distance between the joint portion 512 and the first joint portion 522a is narrower than the distance between the joint portion 512 and the recess 522b. Also, the space between the joint portion 512 and the first joint portion 522a is narrower than the space between the joint portion 512 and the recess 522b.

[0029] As will be described in more detail later, the liquid gasket 530 is compressed between the joint portion 512 and the first joint portion 522a, filling the space between the joint portion 512 and the first joint portion 522. Since the gap between the joint portion 512 and the first joint portion 522a is narrower than the gap between the joint portion 512 and the recess 522b, the liquid gasket 530 fills the space between the joint portion 512 and the first joint portion 522a without any gaps. In other words, the liquid gasket 530 that fills the space between the joint portion 512 and the first joint portion 522a has fewer voids and better adhesion than the liquid gasket 530 that fills the space between the joint portion 512 and the recess 522b.

[0030] On the other hand, the thickness T1 of the liquid gasket 530 between the joint portion 512 and the first joint portion 522a is thinner than the thickness T2 of the liquid gasket 530 between the joint portion 512 and the recess 522b. Therefore, when a load is applied in a direction that separates the first casing 510 and the second casing 520 from each other, the liquid gasket 530 filled between the joint portion 512 and the first joint portion 522a may peel off. In other words, the thickness T1 of the liquid gasket 530 between the joint portion 512 and the first joint portion 522a is thinner than the thickness T2 of the liquid gasket 530 between the joint portion 512 and the recess 522b, making it more prone to peeling.

[0031] Therefore, a recess 522b is provided in the joint portion 522, and the thickness T2 of the liquid gasket 530 between the joint portion 512 and the recess 522b is made thicker than the thickness T1 of the liquid gasket 530 between the joint portion 512 and the first joint portion 522a. This suppresses the peeling of the liquid gasket 530 between the joint portion 512 and the recess 522b, and prevents the entire liquid gasket 530 between the joint portion 512 and the joint portion 522 from peeling off.

[0032] Lubricating oil is introduced into the hollow space S inside the casing 500 to prevent damage to the various components housed in the casing 500, such as the torque converter 310, the forward / reverse switching mechanism 320, and the CVT 330. In this embodiment, the second casing 520 also functions as an oil pan for storing this lubricating oil. The lubricating oil is also used as hydraulic fluid to operate hydraulic devices in the drive transmission system, such as the primary and secondary pulleys of the CVT 330.

[0033] The liquid gasket 530 is provided between the joints 512 of the first casing 510 and 522 of the second casing 520 to prevent lubricating oil from leaking out of the casing 500. The liquid gasket 530 is applied between the joints 512 and 522 and, upon curing, provides a sealing function between the joints 512 and 522.

[0034] However, in order for the liquid gasket 530 to harden and perform its sealing function between the joint portion 512 and the joint portion 522, a certain drying time is required after the application of the liquid gasket 530. The liquid gasket 530 is water-curable and hardens by absorbing moisture. Therefore, by adding water to the liquid gasket 530, the hardening of the liquid gasket 530 can be accelerated, and the drying time after application of the liquid gasket 530 can be shortened.

[0035] However, lubricating oil is sealed in the hollow space S inside the casing 500. Therefore, when water is applied to the liquid gasket 530 between the joints 512 and 522, some of the applied water may be introduced inside the joints 512 and 522 and mix with the lubricating oil in the hollow space S. When lubricating oil and water mix, an emulsion is formed, which can cause problems such as a decrease in the hydraulic function of the hydraulic system.

[0036] Therefore, in this embodiment, by devising the application shape of the liquid gasket 530, when water is applied to promote the hardening of the liquid gasket 530, the intrusion of water into the hollow space S is suppressed.

[0037] Figure 4 is a schematic cross-sectional view showing the first step of applying an uncured liquid gasket 530 to the first joint portion 522a according to this embodiment. As shown in Figure 4, the liquid gasket 530 is applied to the first joint portion 522a of the joint portion 522 of the second casing 520. However, the liquid gasket 530 only needs to be applied to the joint portion between the first casing 510 and the second casing 520, and may be applied to the joint portion 512 of the first casing 510, for example. Alternatively, the liquid gasket 530 may be applied to the portion of the joint portion 512 of the first casing 510 that faces the first joint portion 522a.

[0038] The liquid gasket 530 has a base portion 532 and a wall-like portion 534. The base portion 532 is formed, for example, in a flat plate shape and has a rectangular cross-sectional shape. However, it is not limited to this, and the cross-sectional shape of the base portion 532 may be circular, elliptical, or polygonal.

[0039] The wall-like portion 534 is formed on the base portion 532. The wall-like portion 534 has the function of restricting the movement of water applied to the liquid gasket 530. Specifically, it has the function of restricting the movement of water from the outside to the inside of the casing 500. The wall-like portion 534 is formed, for example, in the shape of a flat plate and has a rectangular cross-sectional shape. However, it is not limited to this, and the cross-sectional shape of the wall-like portion 534 may be circular, elliptical, or polygonal.

[0040] The wall-like portion 534 is located inside the casing 500, relative to the center position O in the width direction W of the liquid gasket 530 applied on the first joint portion 522a (for example, the center position O in the width direction W of the base portion 532). The inside of the casing 500 is the side of the hollow space S of the casing 500, and the outside of the casing 500 is the side opposite to the hollow space S of the casing 500. In this embodiment, the wall-like portion 534 is located, for example, at the innermost part in the width direction W of the base portion 532. In this embodiment, the cross-sectional shape of the liquid gasket 530, including the base portion 532 and the wall-like portion 534, is L-shaped.

[0041] Thus, in this embodiment, the cross-sectional shape of the uncured liquid gasket 530 applied on the first joint portion 522a is a cross-sectional shape that includes the wall-like portion 534, for example, an L-shaped cross-section. However, the embodiment is not limited to this example, and the cross-sectional shape of the applied uncured liquid gasket 530 may be, for example, a T-shape, a right triangle, a multi-step staircase shape, etc. Also, in this embodiment, there is a single wall-like portion 534, but there may be multiple wall-like portions. For example, multiple wall-like portions 534 may be provided on the base portion 532 along the width direction W. In this case, the multiple wall-like portions 534 may have the same height or different heights. If the heights of the multiple wall-like portions 534 are different, the height of the wall-like portions 534 may increase as they get closer to the inside of the casing 500.

[0042] The wall-like portion 534 is the tallest part of the liquid gasket 530 applied to the first joint portion 522a. Therefore, the tallest part of the liquid gasket 530 in this embodiment is located inside the center position O in the width direction W of the base portion 532.

[0043] Thus, the highest part of the liquid gasket 530 applied on the first joint portion 522a only needs to be located inward from the center position O in the width direction W of the base portion 532, and its cross-sectional shape is not limited to an L-shape.

[0044] Figure 5 is a schematic cross-sectional view showing the second step of applying water 540 to the liquid gasket 530 according to this embodiment. As shown in Figure 5, the water 540 is applied to the portion of the liquid gasket 530 applied to the first joint portion 522a that is outside the wall-like portion 534. In other words, the water 540 is not applied to the portion of the liquid gasket 530 applied to the first joint portion 522a that is inside the wall-like portion 534. Note that the portion of the liquid gasket 530 that is outside the wall-like portion 534 may be, for example, the outer wall portion of the wall-like portion 534 that faces the outside of the casing 500, and the portion of the liquid gasket 530 that is outside the casing 500 beyond the said outer wall portion. Furthermore, the portion of the liquid gasket 530 that is inside the wall-like portion 534 may be, for example, the inner wall portion of the wall-like portion 534 that faces the inside of the casing 500, and the portion of the liquid gasket 530 that is inside the casing 500 beyond the said inner wall portion.

[0045] When water 540 is applied to the liquid gasket 530, the wall-like portion 534 restricts the movement of the water 540 toward the inside of the casing 500. This prevents the water 540 from penetrating the hollow space S when water 540 is applied to accelerate the curing of the liquid gasket 530.

[0046] Figure 6 is a schematic cross-sectional view showing the third step of joining the first casing 510 and the second casing 520 according to this embodiment. As shown in Figures 5 and 6, when the first casing 510 and the second casing 520 are brought close together, the uncured liquid gasket 530 and water 540 are crushed, and the water 540 is absorbed into the liquid gasket 530. The liquid gasket 530 that has absorbed the water 540 is then filled into the space between the joining portion 512 and the joining portion 522. The liquid gasket 530 is a water-curable resin, and in this third step, the crushed uncured liquid gasket 530 mixes with the water 540, which promotes the curing of the liquid gasket 530.

[0047] At this time, the wall-like portion 534, which is part of the uncured liquid gasket 530, is crushed by the joint portion 512 of the first casing 510 and the first joint portion 522a of the second casing 520, and moves inward toward the inside of the casing 500, filling the recess 522b.

[0048] Here, since the wall-like portion 534 is located at the innermost part in the width direction W of the base portion 532, it is possible to easily fill the recess 522b with the wall-like portion 534, which is part of the liquid gasket 530.

[0049] Furthermore, while the liquid gasket 530 and water 540 are being compressed, the wall-like portion 534 restricts the movement of the water 540 inward. As a result, as shown in Figure 6, any excess water 540 that the liquid gasket 530 could not absorb is pushed out to the outside of the casing 500 and discharged into the external space of the casing 500.

[0050] In this way, the first casing 510 and the second casing 520 are joined together as the liquid gasket 530 hardens while filling the space between the joint portion 512 and the joint portion 522.

[0051] Next, a method for manufacturing a casing 500 having a hollow space S inside by joining a first casing 510 and a second casing 520 according to this embodiment will be described. Figure 7 is a flowchart of the method for manufacturing a casing 500 according to this embodiment. As shown in Figure 7, the method for manufacturing a casing 500 includes a first step S100 of applying liquid gasket 530, a second step S200 of adding water 540, and a third step S300 of joining the first casing 510 and the second casing 520.

[0052] (1st process S100) In the first step S100, an uncured liquid gasket 530 is applied along the first joint portion 522a, which is the joint between the first casing 510 and the second casing 520, in a cross-sectional shape that includes a wall-like portion 534. Here, the liquid gasket 530 is applied to the first joint portion 522a using a coating machine 600 for applying the uncured liquid gasket 530.

[0053] Figure 8 is a schematic top view of the second casing 520 showing the application of uncured liquid gasket 530 by the coating machine 600 according to this embodiment. Figure 9 is a schematic side view of the nozzle 610 of the coating machine 600 according to this embodiment, viewed from the side 610b.

[0054] As shown in Figure 8, the coating machine 600 has a nozzle 610. Also, as shown in Figure 9, a flow channel 610a for the liquid gasket 530 is formed inside the nozzle 610. The flow channel 610a is formed to extend along the central axis C of the nozzle 610.

[0055] Furthermore, the nozzle 610 is configured to be rotatable around a central axis C. Specifically, the coating machine 600 is equipped with a motor (not shown), which rotates the nozzle 610 around the central axis C.

[0056] As shown in Figure 9, a discharge port 612 communicating with the flow path 610a is formed on the side surface 610b of the nozzle 610. The discharge port 612 has a shape that corresponds to the cross-sectional shape of the liquid gasket 530, including the base 532 and the wall-like portion 534. Specifically, the discharge port 612 has a base discharge portion 612a having a shape that corresponds to the cross-sectional shape of the base 532, and a wall-like portion discharge portion 612b having a shape that corresponds to the cross-sectional shape of the wall-like portion 534.

[0057] The discharge port 612 is oriented perpendicular to the central axis C of the nozzle 610, and the liquid gasket 530 that has flowed through the flow path 610a is discharged from the side surface 610b of the nozzle 610 in a direction perpendicular to the central axis C. By being discharged from the discharge port 612 formed on the side surface 610b of the nozzle 610, the liquid gasket 530 is applied to the first joint portion 522a while maintaining its cross-sectional shape, which includes the three-dimensional wall-like portion 534. In other words, the discharge port 612 allows the liquid gasket 530 to be applied to the first joint portion 522a while maintaining its cross-sectional shape, which includes the three-dimensional wall-like portion 534, by discharging the liquid gasket 530 from the side surface 610b of the nozzle 610.

[0058] The coating machine 600 is moved along the first joint portion 522a by a drive device (not shown). At this time, a motor (not shown) rotates the nozzle 610, thereby changing the direction of the discharge port 612 and allowing the liquid gasket 530 to be applied along the first joint portion 522a.

[0059] A motor (not shown) rotates the nozzle 610 according to the position of the discharge port 612 of the nozzle 610 and the position of the first joint portion 522a. Specifically, the motor adjusts the rotation angle of the nozzle 610 so that when the position of the discharge port 612 of the nozzle 610 is located at the corner of the first joint portion 522a, the wall-shaped discharge portion 612b of the discharge port 612 is located inside the casing 500. In this way, the liquid gasket 530 can be applied along the first joint portion 522a while keeping the wall-shaped portion 534 always inside the casing 500.

[0060] (2nd process S200) In the second step S200, water 540 is applied to the portion of the liquid gasket 530 applied to the first joint portion 522a that is outside the wall-like portion 534. The water 540 is applied, dripped, or sprayed onto the liquid gasket 530 by a water supply nozzle (not shown). The second step S200 has been explained in detail using Figure 5, so a detailed explanation is omitted here.

[0061] (3rd process S300) In the third step S300, the first casing 510 and the second casing 520 are brought close together, and the liquid gasket 530 applied to the first joint portion 522a is crushed together with water 540 and hardened, thereby joining the first casing 510 and the second casing 520. The third step S300 has been explained in detail using Figure 6, so a detailed explanation is omitted here.

[0062] As described above, according to this embodiment, the liquid gasket 530 is applied in a cross-sectional shape including the wall-like portion 534, and the water 540 is applied to the portion of the liquid gasket 530 that is outside the wall-like portion 534. Here, the wall-like portion 534 restricts the movement of the water 540 toward the inside of the casing 500. This makes it possible to suppress the penetration of water 540 into the hollow space S when water 540 is applied to promote the hardening of the liquid gasket 530.

[0063] Furthermore, according to this embodiment, the cross-sectional shape of the liquid gasket 530 including the wall-like portion 534 is such that the wall-like portion 534 is positioned inward from the center position O in the width direction W of the liquid gasket 530. This makes it possible to restrict the movement of water 540 inward from the center position O in the width direction W of the liquid gasket 530.

[0064] Furthermore, according to this embodiment, the joining portion 522 of at least one of the first casing 510 or the second casing 520 has a first joining portion 522a and a recess 522b as a second joining portion formed inside the first joining portion 522a. In the third step of joining the first casing 510 and the second casing 520, a portion of the liquid gasket 530 that is crushed by the proximity of the first casing 510 and the second casing 520 enters the inside of the casing 500. The liquid gasket 530 then hardens while filling the recess 522b. As a result, the thickness T2 of the liquid gasket 530 between the joining portion 512 and the recess 522b can be made thicker than the thickness T1 of the liquid gasket 530 between the joining portion 512 and the first joining portion 522a. As a result, peeling of the liquid gasket 530 between the joining portion 512 and the recess 522b can be suppressed.

[0065] Furthermore, according to this embodiment, the nozzle 610 of the coating machine 600 has a discharge port 612 that corresponds to the cross-sectional shape including the wall-like portion 534. The nozzle 610 of the coating machine 600 is configured to be rotatable around its central axis C. The discharge port 612 of the nozzle 610 is oriented in a direction perpendicular to the central axis C. By rotating the nozzle 610, the orientation of the discharge port 612 is changed while applying the liquid gasket 530 along the first joint portion 522a. This makes it possible to apply the liquid gasket 530 to the first joint portion 522a while maintaining the cross-sectional shape including the three-dimensional wall-like portion 534.

[0066] Embodiments of the present invention have been described above with reference to the attached drawings, but it goes without saying that the present invention is not limited to these embodiments. It is clear to those skilled in the art that various modifications or alterations can be conceived within the scope of the claims, and these will naturally also fall within the technical scope of the present invention.

[0067] For example, in the above embodiment, an example was described in which the casing having an internal hollow space S, formed by joining the first casing 510 and the second casing 520, is casing 500. However, the invention is not limited to this, and the casing having an internal hollow space S, formed by joining the first casing 510 and the second casing 520, may be the casing of an engine 200 to which the cylinder block and the oil pan are joined. Furthermore, the casing having an internal hollow space S, formed by joining the first casing 510 and the second casing 520, may be the casing of an ECU (Engine Control Unit) or TCU (Transmission Control Unit) in which electronic components are provided in the internal hollow space S. [Explanation of Symbols]

[0068] 100 vehicles 200 engine 300 Power transmission device 310 Torque Converter 320 Forward / forward switching mechanism 330 CVT 400 wheels 500 casing 510 First Casing 512 Joint part 520 Second casing 522 Joint part 522a 1st joint part 522b Recess 530 Liquid Gasket 532 Base 534 Wall-like part 600 coating machine 610 Nozzles 610b side 612 Discharge port

Claims

1. In a method for manufacturing a casing, in which a casing having a hollow space inside is manufactured by joining a first casing and a second casing, A first step involves applying a water-curable liquid gasket along the joint between the first casing and the second casing, in a cross-sectional shape that includes a wall-like portion. A second step involves applying water to the portion of the applied liquid gasket that is outside the wall-like portion, A third step involves bringing the first casing and the second casing close together and crushing the applied liquid gasket together with the water to harden it, thereby joining the first casing and the second casing; A method for manufacturing a casing, including the method described above.

2. The cross-sectional shape including the wall-like portion is such that the wall-like portion is positioned inside the casing more than the center position in the width direction of the liquid gasket. A method for manufacturing a casing according to claim 1.

3. The joining portion of at least one of the first casing or the second casing has a first joining portion and a recess as a second joining portion formed inward from the first joining portion. In the third step, a portion of the liquid gasket, which has been crushed by the joint portion of the first casing and the second casing, enters the inside of the casing and hardens while filling the recess. A method for manufacturing a casing according to claim 2.

4. In the first step, the liquid gasket is applied along the joint portion using a coating machine having a nozzle. The nozzle has a discharge port corresponding to the cross-sectional shape including the wall-like portion. A method for manufacturing a casing according to claim 1.

5. The nozzle of the coating machine is configured to be rotatable around the central axis of the nozzle, The discharge port of the nozzle is oriented in a direction perpendicular to the central axis. In the first step described above, the liquid gasket is applied along the joint portion while changing the direction of the discharge port by rotating the nozzle. A method for manufacturing a casing according to claim 4.

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