A connector for an easily detachable photovoltaic junction box

Abstract

This invention relates to the field of photovoltaic junction box connector technology, specifically a connector for an easily detachable photovoltaic junction box. The invention includes a main connecting assembly, which comprises a connecting shell. A threaded seat is fixedly connected to one side of the outer wall of the connecting shell. A rubber shell is threadedly connected to one side of the threaded seat via a connecting rod. A fixing assembly is disposed inside the rubber shell, comprising a main connecting terminal. Limiting rods are fixedly connected to the center positions of both sides of the outer wall of the main connecting terminal. Limiting blocks are fixedly connected to the ends of the two limiting rods away from the main connecting terminal, and the outer walls of the two limiting rods penetrate the rubber shell. The photovoltaic junction box connector of this invention prevents the photovoltaic copper wires from easily falling off, provides greater stability during use, facilitates easier disassembly of the photovoltaic wire connection, and better protects the photovoltaic wire connection points.

Description

Technical Field

[0001] This invention relates to the field of photovoltaic junction box connector technology, specifically a connector for an easily detachable photovoltaic junction box. Background Technology

[0002] In addition to photovoltaic (PV) cell modules, photovoltaic (PV) power generation also requires PV connectors on these modules to transmit power. Currently, PV connectors are primarily cable connectors, installed on the positive and negative leads of the PV cell modules. Their main purpose is to connect PV cell modules to each other, thereby enabling power transmission. Structurally, PV connectors are mainly divided into male connectors (also called pins) and female connectors (also called sockets). Because PV connectors are used in harsh outdoor environments for extended periods, typically over ten years, the reliability and safety requirements for these connectors are very high. The pins and sockets of a PV connector represent the positive and negative terminals, respectively. After insertion, they achieve conductivity through the contact between their internal positive and negative metal terminals. Stable contact between the pins and sockets is crucial for the stability and reliability of PV power generation and is a prerequisite for the normal operation of a PV power plant.

[0003] Most existing photovoltaic (PV) junction box connectors use snap-fit ​​structures to connect the positive and negative terminals. This often requires specialized tools to disassemble the connector head. Without these tools, disassembly is difficult, making it inconvenient. Furthermore, most existing PV junction box connectors use a winding method to connect the copper core of the wires, resulting in a weak connection that can easily fall off due to external factors, affecting the junction box's functionality. Additionally, poor connections or leakage at the connection points are frequently caused by external factors, impacting the junction box's performance and potentially leading to short circuits. Summary of the Invention

[0004] The purpose of this invention is to provide a connector for an easily detachable photovoltaic junction box to solve the problems mentioned in the background art.

[0005] The objective of this invention can be achieved through the following technical solutions:

[0006] A connector for an easily detachable photovoltaic junction box includes a main connecting assembly, the main connecting assembly including a connecting shell, a threaded seat fixedly connected to one side of the outer wall of the connecting shell, a rubber shell threadedly connected to one side of the threaded seat via a connecting rod, and a fixing component disposed inside the rubber shell.

[0007] Preferably, the fixing component includes a main connecting terminal, with limiting rods fixedly connected to both sides of the outer wall of the main connecting terminal near the center, and limiting blocks fixedly connected to the ends of the two limiting rods away from the main connecting terminal, and a rubber shell penetrating the outer walls of the two limiting rods.

[0008] Preferably, one end of the main connecting terminal is fixedly connected to a connector, and the end of the connector away from the main connecting terminal is fixedly connected to a circuit connecting sleeve rod. Multiple fixing ribs are fixedly connected to the outer wall of the circuit connecting sleeve rod, and a circuit connecting slide rod is slidably connected to the inner side wall of the circuit connecting sleeve rod. Multiple connecting posts are fixedly connected to the end of the circuit connecting slide rod away from the circuit connecting sleeve rod. A fixing clamping plate is fixedly connected to the outer wall of the multiple connecting posts. One end of the fixing clamping plate is rotatably connected to a rotating clamping plate via a hinge, and a connecting bolt passes through the other end of the fixing clamping plate. A bearing post passes through one side of the outer wall of the rotating clamping plate near its center position. A first threaded rod is rotatably connected to the inner side wall of the bearing post. A knob is fixedly connected to one end of the first threaded rod, and a first transmission rod is threadedly connected to the end of the first threaded rod away from the knob. A fixing plate is rotatably connected to the end of the first transmission rod away from the first threaded rod. Two first limiting rods are fixedly connected to one side of the fixing plate.

[0009] Preferably, the outer wall of the connecting housing is provided with a clamping mechanism, which includes two transmission boxes. A second threaded rod passes through one side of each of the two transmission boxes near the center position. A rotary knob is fixedly connected to one end of each of the two second threaded rods, and a second transmission rod is threadedly connected to the end of each of the two second threaded rods away from the rotary knob.

[0010] Preferably, a movable seat is fixedly connected to one end of each of the two second transmission rods away from the second threaded rod, and a clamping plate is fixedly connected to one end of each of the two movable seats away from the second transmission rod. A second limiting rod is fixedly connected to one end of each of the two clamping plates away from the center position.

[0011] Preferably, the two transmission boxes are provided with an extension mechanism, which includes a drive gear, a second threaded rod passing through one side of each of the two drive gears, and a driven gear meshing with one side of the outer wall of each of the two drive gears. An extension rod passes through one side of each of the two driven gears, and a sliding rod is threadedly connected to one side of each of the two extension rods.

[0012] Preferably, a top plate is fixedly connected to one end of the two sliding rods away from the extension rod, and a telescopic rod passes through one side of the top plate, with an inlet provided on the inner side wall of the telescopic rod.

[0013] Preferably, the inner wall of the inlet is provided with a secondary body connector, the secondary body connector including a secondary body connecting shell, a threaded shell fixedly connected to one side of the secondary body connecting shell, and a connecting core provided on the inner side wall of the threaded shell.

[0014] Preferably, a fixing rubber sleeve is fixedly connected to the inner wall of the sub-body connecting shell, and a transmission core is fixedly connected to the inner side wall of the fixing rubber sleeve.

[0015] The beneficial effects of this invention are:

[0016] 1. This invention, by setting up a fixing component, main connecting terminal, limiting rod, limiting block, connector, fixing rib, circuit connecting sleeve rod, circuit connecting slide rod, connecting column, fixing clamp, connecting bolt, rotating clamp, knob, bearing column, first threaded rod, first transmission rod, first limiting rod, and fixing plate, allows the device to be used by placing the copper wire portion of the photovoltaic wire into the connecting slide rod, placing the copper wire portion in place by the fixing clamp fixed by the connecting column, fixing the copper wire portion by rotating the rotating clamp, fixing the fixing clamp and rotating clamp by the connecting bolt, and rotating the knob to make the first threaded rod rotate in the bearing column, thereby causing the first threaded rod to drive the first transmission rod to slide on the first threaded rod, thereby causing the fixing plate to press down and clamp the copper wire portion of the photovoltaic wire. The copper wire portion slides in the circuit connecting sleeve rod through the circuit connecting slide rod, allowing the photovoltaic wire to be electrically connected to the main connecting terminal. This prevents the photovoltaic copper wire from easily falling off under external factors, making the photovoltaic wire more stable during use and not affecting the use of the photovoltaic junction box.

[0017] 2. This invention, by setting up a clamping mechanism, a transmission box, a second threaded rod, a rotating knob, a second transmission rod, a movable seat, a clamping plate, and a second limiting rod, allows the device to be wired. Rotating the rotating knob drives the second threaded rod to rotate, which in turn drives the second transmission rod to slide back and forth. The second transmission rod then drives the movable seat to slide, which in turn drives the clamping plate to clamp and fix the transmission core inside the connecting housing. When disassembly is required, simply rotating the rotating knob causes the second threaded rod to rotate, which in turn drives the second transmission rod, which in turn drives the movable seat and the clamping plate to release the transmission core, thus disassembling the photovoltaic wire connection.

[0018] 3. This invention, by setting up an extension mechanism, a driving gear, a driven gear, an extension rod, a sliding rod, a top plate, a telescopic rod, and an inlet, allows the second threaded rod to rotate by rotating a knob. This rotation drives the driving gear on the second threaded rod, which in turn drives the driven gear meshing on one side to rotate. The driven gear then drives the extension rod to rotate, causing the sliding rod threadedly connected to the extension rod to slide. This, in turn, causes the top plate to slide, which in turn causes the telescopic rod to slide within the connecting housing. This protects the connection point from external water or debris, making the connection safer and more stable. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 This is a multi-angle three-dimensional schematic diagram of the present invention;

[0022] Figure 3 This is a schematic diagram of the connection structure of the extension mechanism of the present invention;

[0023] Figure 4 This is a schematic diagram of the rubber shell connection structure of the present invention;

[0024] Figure 5 This is a schematic diagram of the connection structure of the fixed component of the present invention;

[0025] Figure 6 This is a schematic diagram of the internal structure of the connecting shell of the present invention;

[0026] Figure 7 This is a schematic diagram of the sub-body connector structure of the present invention;

[0027] Figure 8 In this invention Figure 5 Enlarged view of the structure at point A in the middle.

[0028] The reference numerals in the figure are as follows: 1. Main connecting assembly; 101. Connecting shell; 102. Threaded seat; 103. Connecting rod; 104. Rubber shell; 2. Fixing assembly; 201. Main connecting terminal; 202. Limiting rod; 203. Limiting block; 204. Connecting head; 205. Fixing rib; 206. Circuit connecting sleeve rod; 207. Circuit connecting slide rod; 208. Connecting column; 209. Fixing clamp; 210. Connecting bolt; 211. Rotating clamp; 212. Knob; 213. Bearing column; 214. First threaded rod; 215. First transmission rod; 216. First... 1. Limiting rod; 2. Fixing plate; 3. Clamping mechanism; 3. Transmission box; 3. Second threaded rod; 3. Rotating knob; 3. Second transmission rod; 3. Moving seat; 3. Clamping plate; 3. Second limiting rod; 4. Extension mechanism; 4. Driving gear; 4. Driven gear; 4. Extension rod; 4. Sliding rod; 4. Top plate; 4. Telescopic rod; 4. Core inlet; 5. Sub-body connector; 5. Sub-body connecting shell; 5. Threaded shell; 5. Connecting core; 5. Transmission core; 5. Fixing rubber sleeve. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] like Figure 1 - Figure 8 As shown, a connector for an easily detachable photovoltaic junction box includes a main connecting assembly 1. The main connecting assembly 1 includes a connecting housing 101. A threaded seat 102 is fixedly connected to one side of the outer wall of the connecting housing 101. A rubber housing 104 is threadedly connected to one side of the threaded seat 102 via a connecting rod 103. A fixing assembly 2 is provided inside the rubber housing 104.

[0031] like Figure 1 , Figure 5 and Figure 8As shown, the fixing component 2 includes a main connecting terminal 201. Limiting rods 202 are fixedly connected to both sides of the outer wall of the main connecting terminal 201 near the center. Limiting blocks 203 are fixedly connected to the ends of the two limiting rods 202 away from the main connecting terminal 201. A rubber shell 104 penetrates the outer walls of the two limiting rods 202. A connector 204 is fixedly connected to one end of the main connecting terminal 201. A circuit connecting sleeve 206 is fixedly connected to the end of the connector 204 away from the main connecting terminal 201. Multiple fixing ribs 205 are fixedly connected to the outer wall of the circuit connecting sleeve 206. A circuit connecting slide rod 207 is slidably connected to the inner wall of the circuit connecting sleeve 206. The circuit connecting slide rod 207 is located away from the circuit connecting sleeve 201. One end of component 6 is fixedly connected to multiple connecting posts 208. A fixing plate 209 is fixedly connected to the outer wall of the multiple connecting posts 208. One end of the fixing plate 209 is rotatably connected to a rotating plate 211 via a hinge, and a connecting bolt 210 passes through the other end of the fixing plate 209. A bearing post 213 passes through one side of the outer wall of the rotating plate 211 near its center. A first threaded rod 214 is rotatably connected to the inner wall of the bearing post 213. One end of the first threaded rod 214 is fixedly connected to a knob 212, and the end of the first threaded rod 214 away from the knob 212 is threadedly connected to a first transmission rod 215. The end of the first transmission rod 215 away from the first threaded rod 214 is rotatably connected to a fixing plate 217. One end of the fixing plate 217... The side-fixed connection has two first limiting rods 216. By setting up a fixing assembly 2, main connection terminal 201, limiting rod 202, limiting block 203, connector 204, fixing rib 205, circuit connection sleeve rod 206, circuit connection slide rod 207, connecting post 208, fixing clamp 209, connecting bolt 210, rotating clamp 211, knob 212, bearing post 213, first threaded rod 214, first transmission rod 215, first limiting rod 216, and fixing plate 217, when using the device, the copper wire portion of the photovoltaic wire is placed into the circuit connection slide rod 207, and the copper wire portion is positioned by the fixing clamp 209 fixed by the connecting post 208. By rotating the rotating clamp 211, the copper wire portion is... The fixing plate 209 and the rotating plate 211 are fixed by connecting bolts 210. By rotating the knob 212, the first threaded rod 214 rotates in the bearing column 213, thereby causing the first threaded rod 214 to drive the first transmission rod 215 to slide on the first threaded rod 214. This causes the fixing plate 217 to press down and clamp the copper wire part of the photovoltaic wire. The copper wire part slides in the circuit connection sleeve 206 through the circuit connection slide rod 207, so that the photovoltaic wire can be electrically connected to the main connection terminal 201. This makes the photovoltaic copper wire less likely to fall off under external factors, making the photovoltaic wire more stable during use and not affecting the use of the photovoltaic junction box.

[0032] like Figure 2 , Figure 3 and Figure 6 As shown, a clamping mechanism 3 is provided on the outer wall of the connecting housing 101. The clamping mechanism 3 includes a transmission box 301. A second threaded rod 302 passes through one side of each of the two transmission boxes 301 near the center position. A rotary knob 303 is fixedly connected to one end of each of the two second threaded rods 302, and a second transmission rod 304 is threadedly connected to the end of each of the two second threaded rods 302 away from the rotary knob 303. A movable seat 305 is fixedly connected to the end of each of the two second transmission rods 304 away from the second threaded rods 302. A clamping plate 306 is fixedly connected to the end of each of the two movable seats 305 away from the second transmission rod 304. A second limiting rod 307 is fixedly connected to both ends of one side of each of the two clamping plates 306 away from the center position. By setting up the clamping mechanism 3, transmission box 301, second threaded rods 302, and rotary knob 302... 03. The second transmission rod 304, the movable seat 305, the clamping plate 306, and the second limiting rod 307 enable the device to be connected by rotating the knob 303, thereby driving the second threaded rod 302 to rotate. This causes the second threaded rod 302 to drive the second transmission rod 304 to slide back and forth. The second transmission rod 304 then drives the movable seat 305 to slide, and the movable seat 305 then drives the clamping plate 306 to clamp and fix the transmission core 504 inside the connecting housing 101. When disassembly is required, simply rotate the knob 303, causing the second threaded rod 302 to rotate and drive the second transmission rod 304. This causes the second transmission rod 304 to drive the movable seat 305 and the clamping plate 306 to loosen the transmission core 504, thus disassembling the photovoltaic wire connection.

[0033] like Figure 1 , Figure 2 , Figure 3As shown, an extension mechanism 4 is provided inside the two transmission boxes 301. The extension mechanism 4 includes a driving gear 401. A second threaded rod 302 passes through one side of each of the two driving gears 401, and a driven gear 402 meshes with one side of the outer wall of each of the two driving gears 401. An extension rod 403 passes through one side of each of the two driven gears 402. A sliding rod 404 is threadedly connected to one side of each of the two extension rods 403. A top plate 405 is fixedly connected to one end of each of the two sliding rods 404 away from the extension rod 403. A telescopic rod 406 passes through one side of the top plate 405. An inlet 407 is provided on the inner side wall of the telescopic rod 406. By setting up the extension mechanism 4, driving gears 401, driven gears 402, and extension rods 403, The sliding rod 404, top plate 405, telescopic rod 406, and inlet 407, through the rotation of the knob 303, drive the second threaded rod 302 to rotate, thereby driving the drive gear 401 on the second threaded rod 302. The drive gear 401 drives the driven gear 402 meshing on one side to rotate, causing the driven gear 402 to drive the extension rod 403 to rotate. This causes the sliding rod 404, which is threadedly connected to the extension rod 403, to slide, driving the top plate 405 to slide, thereby causing the telescopic rod 406 to slide within the connecting housing 101. This protects the connection from external water or debris, making the connection safer and more stable.

[0034] like Figure 1 and Figure 7 As shown, the inner wall of the inlet 407 is provided with a secondary body connector 5. The secondary body connector 5 includes a secondary body connecting shell 501. A threaded shell 502 is fixedly connected to one side of the secondary body connecting shell 501. A connecting core 503 is provided on the inner side wall of the threaded shell 502. A fixing rubber sleeve 505 is fixedly connected to the inner wall of the secondary body connecting shell 501. A transmission core 504 is fixedly connected to the inner side wall of the fixing rubber sleeve 505. This allows the device to fix the photovoltaic wire through the connecting core 503. Through the threaded shell 502, the connecting core 503 slides within the threaded shell 502, thereby allowing the photovoltaic wire to be electrically connected to the transmission core 504. Through the fixing rubber sleeve 505, the transmission core 504 is fixed within the threaded shell 502, making the photovoltaic wire connection more stable.

[0035] The present invention provides a connector for an easily detachable photovoltaic junction box. The working principle is as follows: When using the device, the copper wire portion of the photovoltaic wire is placed into the circuit connection slide bar 207. The copper wire portion is positioned by the fixing clamp 209 fixed by the connecting post 208. The copper wire portion is fixed by rotating the rotating clamp 211. The fixing clamp 209 and the rotating clamp 211 are fixed by the connecting bolt 210. By rotating the knob 212, the first threaded rod 214 rotates within the bearing post 213, thereby causing the first threaded rod 214 to drive the first transmission rod 215 to slide on the first threaded rod 214. This causes the fixing plate 217 to press down, thus pressing down on the photovoltaic... The copper wire portion of the photovoltaic wire is clamped and fixed. The copper wire slides within the circuit connection sleeve 206 via the circuit connection slide bar 207, allowing the photovoltaic wire to be electrically connected to the main connection terminal 201. This prevents the photovoltaic copper wire from easily falling off under external factors, making the photovoltaic wire more stable during use and not affecting the use of the photovoltaic junction box. When wiring, rotating the knob 303 rotates the second threaded rod 302, causing the second threaded rod 302 to drive the second transmission rod 304 to slide back and forth. The second transmission rod 304 drives the moving seat 305 to slide, and the moving seat 305 drives the clamping plate 306 to clamp the incoming... The transmission core 504 inside the connecting housing 101 is clamped and fixed. When disassembly is required, simply rotate the knob 303, causing the second threaded rod 302 to rotate. This causes the second transmission rod 304 to move the moving seat 305 and clamping plate 306 to loosen the transmission core 504, thus disassembling the photovoltaic wire connection. Rotating the knob 303 also causes the second threaded rod 302 to rotate, which in turn drives the drive gear 401 on the second threaded rod 302. The drive gear 401 then drives the driven gear 402 meshing on one side to rotate, which in turn drives the extension rod 403 to rotate, thus allowing the extension rod to move. The sliding rod 404 connected to the extension rod 403 slides, causing the top plate 405 to slide, which in turn causes the telescopic rod 406 to slide within the connecting housing 101, protecting the connection and preventing external water or debris from affecting the connection. This protection makes the connection safer and more stable. The photovoltaic wire is fixed by the connecting core 503. The connecting core 503 slides within the threaded housing 502, allowing the photovoltaic wire to be electrically connected to the transmission core 504. The fixed rubber sleeve 505 fixes the transmission core 504 within the threaded housing 502, making the photovoltaic wire connection more stable.

[0036] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. A connector for an easily detachable photovoltaic junction box, comprising a main connecting assembly (1), characterized in that, The main connecting assembly (1) includes a connecting shell (101), a threaded seat (102) is fixedly connected to one side of the outer wall of the connecting shell (101), and a rubber shell (104) is threadedly connected to one side of the threaded seat (102) via a connecting rod (103). A fixing assembly (2) is provided inside the rubber shell (104). The outer wall of the connecting housing (101) is provided with a clamping mechanism (3). The clamping mechanism (3) includes two transmission boxes (301). A second threaded rod (302) is passed through one side of each of the two transmission boxes (301) near the center position. A rotating knob (303) is fixedly connected to one end of each of the two second threaded rods (302), and a second transmission rod (304) is threadedly connected to the other end of each of the two second threaded rods (302) away from the rotating knob (303). Two second transmission rods (304) are fixedly connected to a movable seat (305) at one end away from the second threaded rod (302), and two movable seats (305) are fixedly connected to a clamping plate (306) at one end away from the second transmission rod (304). Two clamping plates (306) are fixedly connected to two ends away from the center position on one side. The two transmission boxes (301) are provided with an extension mechanism (4). The extension mechanism (4) includes a drive gear (401). A second threaded rod (302) passes through one side of each of the two drive gears (401). A driven gear (402) meshes with one side of the outer wall of each of the two drive gears (401). An extension rod (403) passes through one side of each of the two driven gears (402). A sliding rod (404) is threadedly connected to one side of each of the two extension rods (403). The two sliding rods (404) are fixedly connected to a top plate (405) at one end away from the extension rod (403). A telescopic rod (406) passes through one side of the top plate (405), and an inlet (407) is provided on the inner side wall of the telescopic rod (406).

2. The connector for an easily detachable photovoltaic junction box according to claim 1, characterized in that, The fixing component (2) includes a main connecting terminal (201). Limiting rods (202) are fixedly connected to both sides of the outer wall of the main connecting terminal (201) near the center. A limiting block (203) is fixedly connected to one end of the two limiting rods (202) away from the main connecting terminal (201). A rubber shell (104) penetrates the outer wall of the two limiting rods (202).

3. The connector for an easily detachable photovoltaic junction box according to claim 2, characterized in that, One end of the main connecting terminal (201) is fixedly connected to a connector (204). The end of the connector (204) away from the main connecting terminal (201) is fixedly connected to a circuit connecting sleeve (206). Multiple fixing ribs (205) are fixedly connected to the outer wall of the circuit connecting sleeve (206), and a circuit connecting slide rod (207) is slidably connected to the inner wall of the circuit connecting sleeve (206). Multiple connecting posts (208) are fixedly connected to the end of the circuit connecting slide rod (207) away from the circuit connecting sleeve (206). A fixing clamp (209) is fixedly connected to the outer wall of the multiple connecting posts (208). One end of the fixing clamp (209) is rotatably connected to a rotating clamp via a hinge. The plate (211) has a connecting bolt (210) passing through the other end of the fixed clamping plate (209). A bearing column (213) passes through the center position on one side of the outer wall of the rotating clamping plate (211). A first threaded rod (214) is rotatably connected to the inner side wall of the bearing column (213). A knob (212) is fixedly connected to one end of the first threaded rod (214). A first transmission rod (215) is threadedly connected to the end of the first threaded rod (214) away from the knob (212). A fixed plate (217) is rotatably connected to the end of the first transmission rod (215) away from the first threaded rod (214). Two first limit rods (216) are fixedly connected to one side of the fixed plate (217).

4. The connector for an easily detachable photovoltaic junction box according to claim 1, characterized in that, The inner wall of the inlet (407) is provided with a secondary body connector (5), the secondary body connector (5) includes a secondary body connecting shell (501), a threaded shell (502) is fixedly connected to one side of the secondary body connecting shell (501), and a connecting core (503) is provided on the inner side wall of the threaded shell (502).

5. The connector for an easily detachable photovoltaic junction box according to claim 4, characterized in that, The inner wall of the sub-body connecting shell (501) is fixedly connected to a fixed rubber sleeve (505), and the inner side wall of the fixed rubber sleeve (505) is fixedly connected to a transmission core (504).

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