Housing case

Abstract

To suppress the movement of oil caused by temporary variation of oil level, in a housing case housing a power transmission device.SOLUTION: A housing case housing a power transmission device having a motor and a gear transmitting power supplied from the motor is provided, comprising: a motor chamber housing the motor; a gear chamber housing the gear; a bulkhead separating the motor chamber and the gear chamber from each other; and a flow passage in which oil stored in the motor chamber and the gear chamber flows. The flow passage has: a first opening which is formed along an extension direction extending toward either of the motor chamber and the gear chamber from the bulkhead, and which is located at the bulkhead; and a second opening located at an end portion separated from the bulkhead. The second opening is formed in a position opposing an opposing member in a housed state in which the opposing member is housed in the housing case.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to a housing. [Background technology]

[0002] Conventionally, a housing case is known that houses a power transmission device having a motor and a gear that transmits power supplied from the motor. The housing case has a motor chamber that houses the motor and a gear chamber that houses the gear, and the motor chamber and the gear chamber are separated from each other by a partition. In the power transmission device described in Patent Document 1, the partition has an opening that communicates the motor chamber and the gear chamber, and the oil stored in the motor chamber and the gear chamber moves through the opening, thereby maintaining the oil level of the oil stored in each chamber at an appropriate level. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2022-032456 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the power transmission device described in Patent Document 1, temporary fluctuations in the oil level of the oil stored in each chamber occur due to turning of the vehicle, etc., and there is a risk of excessive oil moving between the motor chamber and the gear chamber. If the oil level becomes excessive, the driving resistance of the gear increases, which can cause problems such as a reduction in motor output. [Means for solving the problem]

[0005] The present disclosure can be realized in the following forms.

[0006] (1) According to one aspect of the present disclosure, there is provided a housing case for housing a power transmission device having a motor and a gear for transmitting power supplied from the motor. The housing case includes a motor chamber for housing the motor, a gear chamber for housing the gear, a partition wall separating the motor chamber and the gear chamber, and a flow path through which oil stored in the motor chamber and the gear chamber flows, the flow path being provided along an extension direction extending from the partition wall toward either the motor chamber or the gear chamber, the flow path having a first opening located in the partition wall and a second opening located at an end portion remote from the partition wall, the second opening being provided at a position facing the opposing member in a housing state in which the opposing member is housed in the housing case. According to this form of accommodating case, the case is provided with a flow path that is arranged along an extension direction extending from the partition toward either the motor chamber or the gear chamber, and has a first opening located in the partition and a second opening located at an end away from the partition.The second opening is arranged at a position facing the opposing member when the opposing member is accommodated in the accommodating case, so that the opposing member can suppress oil flowing in from the second opening due to temporary fluctuations in the oil level height, and excessive oil movement between the motor chamber and the gear chamber can be suppressed. (2) In the above embodiment, the flow path may be positioned such that the minimum value of the cross-sectional area along the extension direction of the space formed between the opposing member and the second opening is less than the minimum value of the flow path cross-sectional area of ​​the flow path. According to this embodiment of the storage case, the cross-sectional area along the extension direction of the space formed between the opposing member and the second opening is less than the minimum value of the flow path cross-sectional area of ​​the flow path, so that the space formed between the opposing member and the second opening can be made small. Therefore, the oil flowing in from the second opening due to temporary fluctuations in the oil level can be easily suppressed by the opposing member, and excessive movement of oil between the motor chamber and the gear chamber can be further suppressed. (3) In the above embodiment, the opposing member may be configured as an oil pump that circulates the oil. According to this form of storage case, the opposing member is formed by the oil pump required to circulate the oil, so that the increase in the mass and manufacturing costs of the storage case due to an increase in the number of parts can be suppressed compared to a configuration that further includes another member as the opposing member. [Brief description of the drawings]

[0007] [Figure 1] 1 is an explanatory diagram showing a schematic configuration of a power transmission device accommodated in a housing case of the present embodiment; DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] A. Embodiment: 1 is an explanatory diagram showing a schematic configuration of a power transmission device 100 accommodated in a housing case 200 of this embodiment. The power transmission device 100 includes a motor 10 and a gear 20. The power transmission device 100 is mounted on a vehicle using the motor 10 as a drive source, such as a hybrid electric vehicle (HEV), a plug-in hybrid electric vehicle (PHV), or a battery electric vehicle (BEV).

[0009] The accommodating case 200 accommodates the power transmission device 100 and the oil pump 300. The state in which the power transmission device 100 and the oil pump 300 are accommodated in the accommodating case 200 corresponds to the "accommodated state" in this disclosure. The accommodating case 200 includes a motor chamber 210 that accommodates the motor 10, a gear chamber 220 that accommodates the gear 20, a partition wall 230 that separates the motor chamber 210 and the gear chamber 220, and a flow path 240.

[0010] The motor 10 has a rotor 11, a stator 12, and a shaft 13. The stator 12 is fixed to the inner surface of a motor chamber 210. The rotor 11 is installed with a radial gap from the inner circumferential surface of the stator 12. One end of the shaft 13 is rotatably installed on the inner surface of the motor chamber 210, and the other end is inserted into a partition wall 230 and installed to be rotatable integrally with the rotor 11. A first gear 211 (described later) is fixed to the end of the shaft 13 located in the gear chamber 220, and the torque of the motor 10 is transmitted to the gear 20.

[0011] The gear 20 includes a reduction gear 21 and a differential gear 22. The reduction gear 21 reduces the torque transmitted from the motor 10 and transmits it to the differential gear 22. The reduction gear 21 includes a first gear 211, a second gear 212, and a third gear 213. The second gear 212 meshes with the first gear 211 fixed to the end of the shaft 13 as described above to transmit the torque of the motor 10. The third gear 213 rotates integrally with the second gear 212 and meshes with the differential gear 22 to transmit the torque to the differential gear 22. The differential gear 22 distributes the transmitted torque to two wheels WL to drive each wheel WL.

[0012] Oil OL is stored in the motor chamber 210 and the gear chamber 220. The oil OL is circulated inside the accommodating case 200 by an oil pump 300 (described later) or is wound up by the rotation of the differential gear 22 and supplied to the motor 10 and the gear 20 to function as a cooling oil and a lubricating oil.

[0013] The flow path 240 is a flow path through which the oil OL stored in the motor chamber 210 and the gear chamber 220 flows. When the oil level of the oil OL stored in one chamber exceeds a predetermined level, the flow path 240 causes the oil OL to flow into the other chamber, thereby maintaining the oil level of the oil OL stored in each chamber at an appropriate level. By maintaining the oil level of the oil OL at an appropriate level, it is possible to suppress seizure of the gear 20, which may occur when the oil OL is insufficient, and an increase in the rotational resistance of the gear 20, which may occur when the oil OL becomes excessive.

[0014] In this embodiment, the flow passage 240 has a cylindrical shape and is provided along the extension direction extending from the partition wall 230 toward the gear chamber 220. The flow passage 240 has the same flow passage cross-sectional area at any position along the extension direction. The "flow passage cross-sectional area" means the cross-sectional area in a direction perpendicular to the extension direction of the space through which the oil OL flows in the flow passage 240. The flow passage 240 has a first opening 241 located in the partition wall 230 and a second opening 242 located at an end portion away from the partition wall 230. When the oil level height of the oil OL stored in the motor chamber 210 exceeds a predetermined height, the oil OL flows into the flow passage 240 from the first opening 241, moves through the flow passage 240, and flows into the gear chamber 220 from the second opening 242.

[0015] In the housed state, the oil pump 300 is disposed on the inner surface of the gear chamber 220. The oil pump 300 has an oil circulation path (not shown), and supplies the oil OL stored in the gear chamber 220 as described above to the motor chamber 210, and circulates the oil within the housing case 200. The second opening 242 is provided at a position facing the oil pump 300 in the housed state. The oil pump 300 corresponds to the "facing member" in this disclosure.

[0016] More specifically, the oil pump 300 is installed so that the cross-sectional area S, which is the minimum value of the cross-sectional area along the extension direction of the space formed between the oil pump 300 and the second opening 242 and is shown by hatching in Fig. 1, is less than the minimum value of the flow path cross-sectional area of ​​the flow path 240. Note that, since the flow path 240 has a cylindrical shape in this embodiment as described above, the cross-sectional area along the extension direction of the above-mentioned space is the same as the minimum cross-sectional area S when viewed from any direction perpendicular to the extension direction. Also, as described above, the flow path 240 has the same minimum flow path cross-sectional area at any position along the extension direction.

[0017] According to the embodiment of the accommodating case 200 described above, the accommodating case 200 is provided with a flow path 240 having a first opening 241 located in the partition 230 along an extension direction extending from the partition 230 toward either the motor chamber 210 or the gear chamber 220, and a second opening 242 located at an end away from the partition 230. The second opening 242 is provided at a position opposite the oil pump 300 in a storage state in which the opposing member is stored in the accommodating case 200. Therefore, the oil OL flowing in from the second opening 242 due to temporary fluctuations in the oil level height can be suppressed by the oil pump 300, and excessive movement of the oil OL between the motor chamber 210 and the gear chamber 220 can be suppressed.

[0018] Furthermore, since the cross-sectional area S along the extension direction of the space formed between the oil pump 300 and the second opening 242 is set to be less than the minimum value of the flow path cross-sectional area of ​​the flow path 240, the space formed between the oil pump 300 and the second opening 242 can be made smaller than a configuration in which the cross-sectional area is equal to or greater than the minimum value of the flow path cross-sectional area of ​​the flow path 240. This makes it easier for the oil pump 300 to suppress the oil OL flowing in from the second opening 242 due to temporary fluctuations in the oil level height, and makes it possible to further suppress excessive movement of the oil OL between the motor chamber 210 and the gear chamber 220.

[0019] In addition, since the opposing member is constituted by the oil pump 300 required to circulate the oil OL, the increase in the mass and manufacturing costs of the accommodating case 200 due to an increase in the number of parts can be suppressed compared to a configuration that further includes another member as the opposing member.

[0020] B. Other embodiments: (B1) In the above embodiment, the facing member is configured as the oil pump 300, but the present disclosure is not limited thereto. The facing member may be configured of any member. For example, the facing member may be formed by forming a plate material forming the gear chamber 220 by protruding toward the inside of the gear chamber 220. In this embodiment, the oil pump 300 may be provided at any position. This embodiment also makes it possible to further suppress excessive movement of the oil OL between the motor chamber 210 and the gear chamber 220 due to temporary fluctuations in the oil level height of the oil OL. In addition, it is possible to suppress the installation position of the oil pump 300 from being limited.

[0021] (B2) In the above embodiment, the flow path 240 is provided extending from the partition wall 230 toward the gear chamber 220, but the present disclosure is not limited to this. The flow path 240 may be provided extending from the partition wall 230 toward the motor chamber 210. In such a configuration, the opposing member is provided in the motor chamber 210, facing the second opening 242 located in the motor chamber 210. Even with such a configuration, the same effects as the above embodiment can be achieved.

[0022] (B3) In the above embodiment, the flow path 240 has a cylindrical shape, but the present disclosure is not limited to this. The flow path 240 may have any tubular shape, not limited to a cylindrical shape. For example, the flow path 240 may have a tubular shape whose cross section in a direction perpendicular to the extension direction is rectangular. This form also produces the same effects as the above embodiment. In this form, the cross-sectional area along the above-mentioned extension direction of the space formed between the oil pump 300 and the second opening 242 differs in size depending on which direction perpendicular to the extension direction it is viewed from. Therefore, the cross-sectional area S is set as the cross-sectional area viewed from the direction perpendicular to the extension direction where the cross-sectional area is smallest.

[0023] (B4) In the above embodiment, the oil pump 300 is provided so that the cross-sectional area S is less than the minimum value of the flow passage cross-sectional area, but the present disclosure is not limited thereto. The oil pump 300 may be provided so that the cross-sectional area S is equivalent to the flow passage cross-sectional area. "The cross-sectional area S is equivalent to the flow passage cross-sectional area" means that the difference between the cross-sectional area S and the flow passage cross-sectional area is within the range of ±10% of the flow passage cross-sectional area. Even with this embodiment, it is possible to further suppress the excessive movement of oil OL between the motor chamber 210 and the gear chamber 220 due to temporary fluctuations in the oil level height, compared to a embodiment in which the oil pump 300 is not provided to face the second opening 242.

[0024] The present disclosure is not limited to the above-mentioned embodiment, and can be realized in various configurations without departing from the spirit of the present disclosure. For example, the technical features in the embodiments corresponding to the technical features in each aspect described in the Summary of the Invention column can be appropriately replaced or combined to solve some or all of the above-mentioned problems or to achieve some or all of the above-mentioned effects. Furthermore, if the technical feature is not described as essential in this specification, it can be appropriately deleted. [Explanation of symbols]

[0025] Reference Signs List 10...motor, 11...rotor, 12...stator, 13...shaft, 20...gear, 21...reduction gear, 22...differential gear, 100...power transmission device, 200...accommodation case, 210...motor chamber, 211...first gear, 212...second gear, 213...third gear, 220...gear chamber, 230...partition wall, 240...flow path, 241...first opening, 242...second opening, 300...oil pump, OL...oil, S...cross-sectional area, WL...wheel

Claims

1. A housing case for housing a power transmission device having a motor and a gear for transmitting power supplied from the motor, a motor chamber that houses the motor; a gear chamber that accommodates the gear; a partition wall separating the motor chamber and the gear chamber; a flow path through which oil stored in the motor chamber and the gear chamber flows, the flow path being provided along an extension direction extending from the partition wall toward either the motor chamber or the gear chamber, the flow path having a first opening located in the partition wall and a second opening located at an end portion away from the partition wall; Equipped with The second opening is provided at a position facing the opposing member in a storage state in which the opposing member is stored in the storage case. Storage case.

2. The storage case according to claim 1, the flow path is positioned such that a minimum value of a cross-sectional area along the extension direction of a space formed between the opposing member and the second opening is less than a minimum value of a flow path cross-sectional area of ​​the flow path. Storage case.

3. The storage case according to claim 1 or 2, The opposing member is configured as an oil pump that circulates the oil. Storage case.

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