Ball nut assembly and end component thereof

An end component, adapted to be assembled on a nut so as to allow a plurality of balls rolling thereon, wherein the end component comprises:

• a first contact surface;
• a second contact surface opposite to the first contact surface;
• a radial surface radially extending and connected to the first contact surface and the second contact surface;
• a fixing portion arranged on the radial surface;
• and
• a reflow bend arranged on the second contact surface, and is open towards the second side surface;
• wherein the end component further comprises an axial surface extending axially and connected to the first contact surface and the second contact surface, the first contact surface has a first fillet portion, and a second fillet portion is between the second contact surface and the axial surface;
• wherein the end component further having an arc surface, the arc surface is opposite to the axial surface and connected to the first contact surface and the second contact surface;
• a line connecting to the second fillet portion and a center of circle of the arc surface forms a reference axis, and an angle between a virtual extension line of the second contact surface and the reference axis is between 40 and 50 degrees.

A ball nut assembly, comprising:

• a nut body comprising an outer ring wall, an inner ring wall, a ball groove, an assembling groove, and a fixing hole, wherein the ball groove is annularly arranged on the inner ring wall;
• the reflow channel is axially defined through the nut body between the outer ring wall and the inner ring wall;
• the assembling groove is arranged on an end portion, and the assembling groove has a first side surface, a second side surface, a bottom surface, and an assembling groove wall;
• the first side surface and the second side surface are opposite to each other;
• the bottom surface is connected to the first side surface and the second side surface, and the fixing hole is on the bottom surface;
• the assembling groove wall is adjacent to the first side surface, the second side surface, and the bottom surface, and a surface of the assembling groove wall is flushed with a surface of the outer ring wall;
• and
• an end component accommodated in the assembling groove of the nut body, wherein the end component comprises a first contact surface, a second contact surface, a radial surface, a fixing portion, and a reflow bend;
• the first contact surface is opposite to the second contact surface;
• the radial surface extends radially and is connected to the first contact surface and the second contact surface;
• the fixing portion is arranged on the radial surface;
• the reflow bend is arranged on the second contact surface;
• the first contact surface contacts the first side surface of the assembling groove in a force-fit manner;
• the second contact surface contacts the second side surface of the assembling groove in the force-fit manner, two ends of the reflow bend respectively correspond to the ball groove and the reflow channel, and the reflow bend formed as a groove in the end component, the groove interconnecting the two ends of the reflow bend and an entirety of the groove being open to an exterior of the end component;
• the fixing portion is fixed in the fixing hole;
• wherein the end component further comprises an axial surface extending axially and connected to the first contact surface and the second contact surface, the first contact surface has a first fillet portion, and a second fillet portion is between the second contact surface and the axial surface;
• wherein the nut body has an axial center, a line connecting the second fillet portion and the axial center forms a reference axis, and an angle between a virtual extension line of the second contact surface and the reference axis is between 40 and 50 degrees.