CN119448120A - Sealing assembly, cable for driving motor and sealing method thereof - Google Patents
Sealing assembly, cable for driving motor and sealing method thereof Download PDFInfo
- Publication number
- CN119448120A CN119448120A CN202411056604.8A CN202411056604A CN119448120A CN 119448120 A CN119448120 A CN 119448120A CN 202411056604 A CN202411056604 A CN 202411056604A CN 119448120 A CN119448120 A CN 119448120A
- Authority
- CN
- China
- Prior art keywords
- cable
- sealing member
- sealing
- heat
- conductors
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000007789 sealing Methods 0.000 title claims abstract description 69
- 238000000034 method Methods 0.000 title claims abstract description 16
- 239000004020 conductor Substances 0.000 claims abstract description 30
- 238000009413 insulation Methods 0.000 claims abstract description 9
- 239000000853 adhesive Substances 0.000 claims description 6
- 230000001070 adhesive effect Effects 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 239000003292 glue Substances 0.000 description 3
- 235000015110 jellies Nutrition 0.000 description 3
- 239000008274 jelly Substances 0.000 description 3
- 230000029058 respiratory gaseous exchange Effects 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 2
- 230000000241 respiratory effect Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 239000000499 gel Substances 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910001172 neodymium magnet Inorganic materials 0.000 description 1
- 230000004202 respiratory function Effects 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
- 238000004073 vulcanization Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G15/00—Cable fittings
- H02G15/013—Sealing means for cable inlets
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/22—Auxiliary parts of casings not covered by groups H02K5/06-H02K5/20, e.g. shaped to form connection boxes or terminal boxes
- H02K5/225—Terminal boxes or connection arrangements
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2205/00—Specific aspects not provided for in the other groups of this subclass relating to casings, enclosures, supports
- H02K2205/09—Machines characterised by drain passages or by venting, breathing or pressure compensating means
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Motor Or Generator Frames (AREA)
Abstract
The invention relates to a sealing assembly, a cable wire for a driving motor and a sealing method thereof. The cable (114) includes a plurality of conductors (102) with respective insulation and all covered by a jacket (108). The seal assembly (100) includes a seal member (112), a first portion (106) having an inlet, and a second portion (104) having a plurality of outlets. The sealing member (112) is slidably inserted over the electrical cable (114) through the first portion (106) such that the first portion (106) covers the sheath (108) and the plurality of conductors (102) of the electrical cable (114) pass through the plurality of outlets of the second portion (104). The sealing member (112) is made of a heat shrinkable tube which, when heat is applied, shrinks the first portion (106) and the second portion (104) and seals any gap therein, characterized in that at least one air flow path (110) is formed between the first portion (106) and the sheath (108) of the cable (114).
Description
Technical Field
The present disclosure relates to a sealing assembly for a cable of a drive motor, and a method of sealing a cable.
Background
In drive motors for two-wheeled vehicles and other types of vehicles, water ingress into the drive motor is a serious problem. It may cause incipient faults and may cause rust inside the motor, followed by seizure of the motor. In existing designs, water does not enter from the motor area (seals, shaft, cover, etc.), but the cable harness connecting the motor to the motor control unit is not certified by IP 67. In view of the benefits of the breathing feature, the harness is intentionally held in this way in order to ensure durability of the motor. However, current breathing capacity also results in water entering the motor during heavy rain/high pressure water flushing.
The solution currently used in the market is to inject glue into the opening of the wire harness to a certain depth (up to 5 cm) to seal the connection end 204 of the cable 114. But this solution has potential durability problems and the effect is entirely dependent on the quality of the glue used. This concept also seals the motor completely, thereby removing the respiratory function of the harness. The glue must also be able to cope with road vibration, high temperature operation (> 100 degrees celsius), and its effectiveness throughout the life of the motor is now unknown. Jelly filled cable harnesses are also available, but are rarely used because of their high cost.
According to the prior art DE2927558 a waterproof clamp and cable termination are disclosed-conductors and jackets with back stripping, which are enclosed as clamps and vulcanized to a device (appts). Clamps and waterproof connectors are used for the wiring of electrical equipment, especially for motor vehicle meters. The connector includes a thermoplastic wire jacket (grommet) that is vulcanized onto the end of the electrical lead and carries a sleeve-like section as an extension of each individual insulated conductor in the cable. The cable is fed into the end of the sleeve wire sheath so that the outer sheath of the cable is gripped and protected. Each insulated individual stranded conductor is back stripped such that the insulated portion is fed forward into the extension of the jacketing and wire sheathing unit. The bare stranded conductors extending from the grommet extensions are further protected by collars that slide over the ends and are glued or vulcanized to the main grommet unit. The outer surface of the sleeve wire sheath is molded into an annular form to permit vulcanization sealing into the housing of the device at the input point.
Drawings
Embodiments of the present disclosure are described with reference to the following drawings,
FIG. 1 illustrates a seal assembly for a cable of a drive motor according to an embodiment of the present invention;
FIG. 2 illustrates a perspective view of an assembled seal for a cable for a drive motor, according to an embodiment of the present invention, and
Fig. 3 illustrates a flow chart of a method for sealing an exposed end of an electrical cable of a drive motor according to the present invention.
Detailed Description
Fig. 1 illustrates a seal assembly for a cable line of a drive motor according to an embodiment of the present invention. The cable 114 includes a plurality of conductors 102 with respective insulation and all covered by a jacket 108 (also referred to as an outer jacket). A plurality of conductors 102 are partially exposed from the insulation and jacket 108 for connection to a battery, control unit of the vehicle. The seal assembly 100 includes a seal member 112 (also referred to as a wire break pin), a first portion 106 having an inlet, and a second portion 104 having a plurality of outlets. The sealing member 112 is slidably inserted over the electrical cable 114 through the first portion 106 such that the first portion 106 covers the jacket 108 of the electrical cable 114 and the plurality of conductors 102 of the electrical cable 114 pass through the plurality of outlets of the second portion 104. The sealing member 112 is made of a heat shrinkable tube which, when heat is applied, shrinks the first and second portions 106, 104 and seals the gap between the sealing member 112 and the cable 114 (any gap therein), characterized in that at least one air flow path 110 is formed between the first portion 106 of the sealing member 112 and the sheath 108 of the cable 114.
In fig. 1, two views are shown. The first view 116 shows the sealing member 112 secured at the open/connected end 204 (shown in fig. 2) of the cable 114. The second view 118 shows a cross-sectional view of the sealing member 112 secured at the open/connecting end 204 of the cable 114. The electrical cable 114 is a multi-conductor cable having at least two or more conductors 102. The conductor 102 is insulated and partially stripped at the opening/connection end 204 where the connection is to be made. Accordingly, conductor 102, insulator, and jacket 108 together are referred to as a cable conductor 114. There is an air gap between jacket 108 and conductor 102 that exists throughout the length of cable 114.
According to an embodiment of the invention, the at least one air flow path 110 is along the first portion 106 and communicates with the air gap within the electrical cable 114. According to another embodiment, an adhesive material is filled between the sealing member 112 and the cable wires 114 before heat is applied. According to a further embodiment, at least one airflow path 110 is formed in a straight line or a curved line. The at least one airflow path 110 begins at the input end of the first portion 106, extends within or inside the first portion 106 to the beginning of the second portion 104, and then connects with the air gap of the electrical cable 114.
According to an embodiment of the invention, the at least one air flow path 110 is formed by inserting an element (not shown) between the first portion 106 of the sealing member 112 and the sheath 108 of the cable conductor 114 before applying heat and removing the element after applying heat. The element acts as a placeholder that is positioned before the heat is applied and then pulled out as desired after the heat shrinking process is completed.
According to an embodiment of the present invention, a cable 114 of the drive motor is provided, or a drive motor with the cable 114 is provided. The cable 114 includes a plurality of conductors 102 with respective insulation and all covered by a jacket 108. The plurality of conductors 102 are partially exposed from the insulation and jacket 108 for connection. The cable 114 includes a sealing member 112 (also referred to as a break-out pin) having a first portion 106 with an inlet and a second portion 104 with a plurality of outlets. The sealing member 112 is slidably inserted over the electrical cable 114 through the first portion 106 such that the first portion 106 covers the jacket 108 of the electrical cable 114 and the partially exposed plurality of conductors 102 pass through the plurality of outlets of the second portion 104. The sealing member 112 is made of a heat shrinkable tube which, when heat is applied, shrinks the first portion 106 and the second portion 104 and seals any gap therein, or which is interposed on the heat shrinkable tube, characterized in that the at least one air flow path 110 is formed between the first portion 106 of the sealing member 112 and the sheath 108 of the electric cable 114.
According to an embodiment of the present invention, the at least one airflow path 110 is formed in any one of a straight line or a curved line. The at least one airflow path 110 is in flow communication with an air gap within the electrical cord 114. According to another embodiment, an adhesive material is filled between the sealing member 112 and the cable wires 114 before heat is applied. According to a further embodiment of the invention, the at least one air flow path 110 is formed by inserting an element between the first portion 106 of the sealing member 112 and the sheath 108 of the cable conductor 114 before applying heat and removing the element after applying heat.
According to an embodiment of the present invention, each of the air flow paths 110 is formed with a diameter of 1 millimeter. In another embodiment, the at least one airflow path 110 includes two airflow paths 110 formed on diametrically opposite sides of the electrical cable 114. The opening size of the at least one airflow path 110 and the number of airflow paths 110 are desirably designed and are not limited to the examples provided.
According to an embodiment of the present invention, the drive motor is any one selected from the group consisting of a hub motor or a side mounted motor (with neodymium magnets), or as a motor mounted on a wheel of an electric vehicle or a hybrid vehicle.
Fig. 2 illustrates a perspective view of an assembled seal of a cable for a drive motor according to an embodiment of the present invention. The multi-core conductor 102 is shown as four in number, however, this is not to be construed in a limiting manner. A multi-core cable is possible with two or more conductors 102. In fig. 2, the at least one airflow path 110 is explicitly shown. The connecting end 204 of the electrical cable 114 is remote from the opening 202 of the at least one airflow path 110.
According to an embodiment of the present invention, there is provided the use of the seal assembly 100. It is contemplated that the sealing member 112 is filled with a jelly-based adhesive. The sealing member 112 includes an inlet and a plurality of outlets. Upon heating the sealing member 112, which is a heat shrinkable tube, the sealing member 112 shrinks and is firmly attached to the surface of the electric cable 114. The sealing member 112 ensures that there are no open gaps through which water may enter the cable 114. The adhesive gel inside the sealing member 112 ensures that the individual outlets (or branching ports) seal well when contracted. These sealing members 112 cooperate very well with high temperature operation and pose no threat to water ingress.
In accordance with the present invention, a process is provided for sealing using the sealing member 112. The first step includes assembling a jelly filled sealing member 112 (heat shrinkable tube) prior to assembling the cable 114. A next step includes sealing the sealing member 112 to the electrical cable 114 using a heat shrink process. The heat shrinkage process is controlled such that there is an indispensable gap provided at the inlet portion after heating. This maintains the respiratory capacity of the cable 114 of the drive motor. The cable 114 or drive motor is subjected to a leak test at the end of the motor assembly line to ensure that the sealing member 112 is fully sealed. Specific steps are defined in fig. 3.
Fig. 3 illustrates a flow chart of a method for sealing an exposed end of an electrical cable of a drive motor according to the present invention. The method includes a number of steps wherein step 302 includes inserting the sealing member 112 over the connection end 204 of the electrical cable 114. The sealing member 112 includes a first portion 106 of the jacket 108 covering the electrical cable 114 and a second portion 104 with a plurality of outlets through which the plurality of conductors 102 of the electrical cable 114 pass. Step 304 includes applying heat to sealing member 112 to cause it to contract and seal any gap between sealing member 112 and cable 114. The method is characterized by a step 306 of inserting the element between the first portion 106 of the sealing member 112 and the jacket 108 of the cable 114 prior to applying heat. Step 308 includes removing the component after the heat shrinking process is completed. Step 306 is completed before step 306, and step 308 is performed after step 304.
According to an embodiment of the present invention, the sealing member 112 prevents water from entering without losing the respiratory ability of the drive motor. The seal assembly 100 according to the present invention ensures that no moisture is trapped inside the drive motor during manufacture, that no pressure builds up inside the drive motor as the temperature increases during operation, and that the motor is very simple to perform a leak test on the assembly line. The respiration of the drive motor is also maintained.
It should be understood that the embodiments explained in the above description are illustrative only and do not limit the scope of the present invention. Many such embodiments are contemplated, as well as other modifications and variations to the embodiments explained in the description. The scope of the invention is limited only by the scope of the claims.
Claims (10)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IN202341052140 | 2023-08-03 | ||
| IN202341052140 | 2023-08-03 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN119448120A true CN119448120A (en) | 2025-02-14 |
Family
ID=94277315
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202411056604.8A Pending CN119448120A (en) | 2023-08-03 | 2024-08-02 | Sealing assembly, cable for driving motor and sealing method thereof |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN119448120A (en) |
| DE (1) | DE102024206772A1 (en) |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2927558C2 (en) | 1979-07-07 | 1982-10-07 | Robert Bosch Gmbh, 7000 Stuttgart | Connection cable for an electrical device |
-
2024
- 2024-07-18 DE DE102024206772.5A patent/DE102024206772A1/en active Pending
- 2024-08-02 CN CN202411056604.8A patent/CN119448120A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| DE102024206772A1 (en) | 2025-02-06 |
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| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication |