Server and expansion tray thereof

A server, comprising:

• a server motherboard;
• a limiting element, having a limiting portion and the limiting element fixed to the server motherboard;
• and
• an expansion tray, comprising:
• a tray body;
• a driven assembly, comprising a positioning element and fixed to the tray body;
• and
• a matching element, fixed to the tray body and the matching element matched with the limiting element, and
• a case, wherein the case comprises a bottom plate and a side plate connected to each other, and the server motherboard is fixed to the bottom plate;
• and the side plate comprises a first positioning block, the first gear is provided with a guide groove, and the guide groove is snap-fitted to the first positioning block in response to the positioning pin being moved from the first position to the second position;
• wherein the positioning element has a first position and a second position, and in response to the positioning element being located at the second position, the positioning element is located at the limiting portion to maintain the matching relationship between the matching element and the limiting element;
• wherein the driven assembly comprises a first gear and a second gear, the first gear and the second gear are respectively pivotally connected to the tray body, and the first gear is engaged with the second gear;
• and the positioning element comprises a positioning pin and a connecting arm, the connecting arm is connected between the first gear and the positioning pin.

An expansion tray, adapted to a support structure for a server motherboard, wherein the support structure comprises a limiting element, and the expansion tray comprises:

• a tray body;
• a driven assembly, comprising a positioning element and fixed to the tray body;
• and
• a sleeve, fixed to the tray body and the sleeve matched with the limiting element, wherein
• the positioning element has a first position and a second position, and in response to the positioning element being located at the second position, the positioning element is located at a limiting hole of the limiting element to maintain the matching relationship between the sleeve and the limiting element;
• wherein the matching element is a sleeve, and the sleeve is provided with a through hole;
• the limiting portion is a limiting hole, and in response to the sleeve being sleeved on the limiting element, the limiting hole corresponds to the through hole, and an upper edge of the through hole is substantially aligned with or higher than an upper edge of the limiting hole;
• and the positioning element comprises a positioning pin, and the positioning pin is substantially in contact with the upper edge of the limiting hole.