IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0568840
(2012-08-07)
|
등록번호 |
US-8783951
(2014-07-22)
|
우선권정보 |
JP-2011-179616 (2011-08-19) |
발명자
/ 주소 |
|
출원인 / 주소 |
- Nippon Thompson Co., Ltd.
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
1 인용 특허 :
4 |
초록
▼
A miniature linear motion guide unit is described in which a tubular member for a return passage is installed in an outward open recess cut in the carriage and a covering to bear the tubular member is integral with an end cap major part. This construction helps make the slider compact with cost savi
A miniature linear motion guide unit is described in which a tubular member for a return passage is installed in an outward open recess cut in the carriage and a covering to bear the tubular member is integral with an end cap major part. This construction helps make the slider compact with cost saving in production. The slider is composed of a carriage made up of an upper portion and side bulges extending downward and having the outward open recesses, end caps having turnaround passages, the tubular members lying on outsides of the side bulges of the carriage, and coverings connected integrally with the end cap major parts to embrace the tubular members in combination with the outsides of the carriage.
대표청구항
▼
1. A linear motion guide unit comprising a guide rail having first lengthwise raceway grooves on both longitudinal sides thereof, a slider that fits over or conforms to the guide rail and has second raceway grooves extending lengthwise in opposition to the first raceway grooves, and a plurality of b
1. A linear motion guide unit comprising a guide rail having first lengthwise raceway grooves on both longitudinal sides thereof, a slider that fits over or conforms to the guide rail and has second raceway grooves extending lengthwise in opposition to the first raceway grooves, and a plurality of ball rolling elements rolling through circulating circuits made up of races defined between the first raceway grooves and the second raceway grooves, return passages extending in the slider in parallel with the races, and turnaround passages connecting the races with the return passages in the slider; wherein the slider is composed of a carriage which is made up of a flat upper portion spreading above and in opposition to a top surface of the guide rail and side bulges lying on widthwise opposite sides of the upper portion to extend downward alongside of the longitudinal sides of the guide rail and further having the second raceway grooves on inside surfaces thereof,a pair of end caps secured on lengthwise opposite ends of the carriage, one to each end, and provided therein with the turnaround passages, a pair of cylindrical tubular members lying on outsides of the side bulges of the carriage to extend in a longitudinal direction, the tubular members having circular through-holes serving as the return passages, anda pair of coverings connected with the end caps to embrace the tubular members in combination with the outsides of the side bulges of the carriage,wherein the outsides of the side bulges of the carriage have lengthwise outward open recesses which are open outward to fit over or conform to outer cylindrical surfaces of the tubular members to keep the tubular members in parallel lengthwise with respect to the second raceway grooves, the outward open recesses being each constituted with a circular concave portion in a cross section extending lengthwise of the carriage while conforming to the outer cylindrical surface of the tubular member, an upper relief side or relief portion extending lengthwise of an upper edge of the circular concave portion, and a lower relief side or portion extending lengthwise of a lower edge of the circular concave portion, and further wherein the circular concave portion fits over the outer cylindrical surface of the tubular member, the upper relief side being formed to be separated by a difference above a horizontal level of the upper edge of the circular concave portion to provide a clearance spaced away from the outer cylindrical surface of the tubular member, and the lower relief side being formed to provide a clearance spaced away from the outer cylindrical surface of the tubular member, the clearance of the lower relief side being defined by a tangential line or surface extending downwards from the circular concave portion at a preselected angle with respect to the horizontal level,wherein the covering has an inner circular surface extended lengthwise and concaved in an arc in a cross section so as to make abutment against the outer cylindrical surface of the tubular member to embrace or cover over a substantial half of the outer cylindrical surface of the tubular member, the covering having a contour constituted with a side wall and a bottom wall extending together lengthwise to form a L-shape in a cross section, the bottom wall having a lengthwise edge formed into a lengthwise tongue having a wedged shape in a transverse section, and the lengthwise tongue extending in the clearance defined between the tubular member and the lower relief side of the carriage to wedge or retain in place the tubular member,wherein the lengthwise side wall of the covering has a lengthwise side surface set back with respect to a lengthwise outside of the carriage, and the lengthwise bottom wall of the covering has a bottom surface set back with respect to a lower surface of the carriage, andwherein the tubular member has a porous or cellular structure and lubricant retained in the tubular member gets oozed out of pores or cells of the porous structure to apply the lubricant around the ball rolling elements by a stress or impact of the ball rolling elements as the ball rolling elements roll through the return passages. 2. A linear motion guide unit constructed as defined in claim 1, wherein the end caps are each composed of a spacer part and an end cap major part which are assembled with each other into the end cap, the spacer part at a rear surface thereof making engagement or abutment against any one of the lengthwise opposite ends of the carriage and at a front surface opposite to the rear surface thereof having inside curved grooves of the turnaround passages, the end cap major part at a rear surface thereof making engagement or abutment against the front surface of the spacer part and having outside curved grooves of the pair of the turnaround passages lying in opposition to the inside curved grooves of the turnaround passages, the end cap of the end cap major part combined with the spacer part having a pair of circular or annular portions raised above the rear surface of the end cap to form in part ends of the return passages which are in alignment with the return passages defined inside the tubular member, and the paired circular or annular portions on the end cap being composed of a pair of semicircular halves raised above the rear surface of the spacer part to communicate with the inside curved grooves of the turnaround passages and a pair of other semicircular halves raised above the rear surface of the end cap major part to communicate with the outside curved grooves of the turnaround passages. 3. A linear motion guide unit constructed as defined in claim 2, wherein the covering has an overall length equivalent to a total length of the tubular member and twice a length of the annular portion, the overall length of the covering being selected dependently to a length of the carriage. 4. A linear motion guide unit constructed as defined in claim 2, wherein the covering is joined at one of lengthwise ends thereof with one of the semicircular portions on one of the end cap major parts, while another end of the covering has a tenon or protrusion which fits into a mortise or recess cut along an outer circular surface of the semicircular portion on another end cap major part whereby the covering is connected between the end caps opposite to each other across the carriage. 5. A linear motion guide unit constructed as defined in claim 2, wherein the covering at each of the lengthwise opposite ends thereof has the tenons or projections which fit into the mortises or recesses cut along the outer circular surfaces of the semicircular portions on the end cap major parts whereby the covering is connected between the end caps opposite to each other across the carriage. 6. A linear motion guide unit constructed as defined in claim 1, wherein the outward open recess on the carriage comes into engagement with the tubular member across a retaining amount of 25% or more of a diameter of the tubular member.
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