JPH0639889U - Screw jack - Google Patents

Abstract

(57) [Summary] [Purpose] To reduce the number of man-hours and reduce the weight of screw jacks. [Structure] Bed A is divided into a bed 1 using a steel plate for the load acting surface and a bed 2 using an aluminum material for the part that secures the ground contact area, and the joint surface between bed 2 of case A and case is small The small bevel gear bearing portion 8 integrated with the handle joint 12 is provided on the center line n of the bevel gear bearing, and on this joint surface.
The joint surface of the tuck-in bed 2 and the joint surface of the case 11 are joined and tightened and fixed by the bolt 13.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a screw jack to be used when lifting a heavy object such as an automobile.

[0002]

[Prior art]

 Conventionally, beds of screw jacks are generally widely used as an integrated structure of steel plate or FC cast. For small bevel gears, holes are made in the case, small bevel gears are inserted into the holes, and a retaining mechanism is provided. ing.

[0003]

[Problems to be solved by the device]

 The problem of the above-mentioned conventional screw jack is that the contact surface area S of the bearing on the bed receives the total load W of the weighted body, and therefore the strength is required to withstand the surface pressure W / S. Therefore, it is difficult to reduce the weight by using an aluminum material. Further, in the small bevel gear driven from the outside, one end of the bearing body is inserted into the bearing hole provided in the case and the outside is ring-locked, so that the bearing portion becomes thick. Further, in order to make the bearing part thinner, the joint part is divided and screwed, so that the number of parts is increased, which results in an inconvenience that the number of assembling steps is increased.

[0004]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, the present invention uses a steel plate only in a load portion to receive a load to secure strength, and adopts an aluminum material in the ground contact area portion to divide the bed into two parts so as to secure the ground contact surface. , The bed has the joint surface of the case on the centerline of the small bevel gear bearing, and the small bevel gear bearing integrated with the handle joint is clamped in between so that the joint surface is tightened and fixed to reduce weight and reduce the number of parts and man-hours. The purpose of the present invention is to provide a screw jack for the purpose.

[0005]

[Advantages] The bottom surface 2a of the bed 1 and the bottom surface 1a of the bed 1 are flush with the stepped portion 3a provided in the central window 3 of the bed 2 having the rising wall 4 In addition, the small umbrella gear bearing portion of the joint portion of the upper edge 4a of the rising wall 4 and the joint portion of the case 11 8 The large umbrella in which the lower end of the main screw shaft 5 is coupled in the recessed recesses 9 and 10 on the center line. The bearing piece 8 of the handle joint 12 integrated with the small bevel gear bearing portion 8 meshed with the gear 6 is inserted into the recessed portions 9 and 10 of the joint surface, and is fitted to the case-side joint edge. When the joining surfaces are overlapped with each other at 11a, the peripheral portion of the bed 1 positioned on the stepped portion 3a of the bed 2 is joined by pressing and fixing the joining surface when tightening.

[0006]

【Example】

 FIG. 1 shows an embodiment of the screw jack according to the present invention, which will be specifically described below with reference to the drawings.

Reference numeral A shows the entire bed of the jack. The bed A is composed of a bed 1 using a steel plate and a bed 2 using an aluminum material.

The bed 2 serves as an outer shell that secures a ground contact surface, has a window 3 at the center, a step 3a, and a rising wall 4 around the step 3a. .

Furthermore, the bed 1 is housed in the opening of the window hole 3 with its peripheral edge positioned on the stepped portion 3 a, and the bottom surface 1 a of the bed 1 is flush with the bottom surface 2 a of the bed 2. I am doing it. The upper edge joint surface 4a of the rising wall 4 of the bed 2 is horizontal up to the position of the central axis m of the main screw shaft 5 described later, and meshes with the large bevel gear 6 to which the lower end of the main screw shaft 5 is bonded. The bevel gear 7 is formed to be inclined along the bearing center line n.

On the small bevel gear bearing center line n of the inclined portion, a small bevel gear bearing portion 8 is provided with a recessed portion 9, and a small recess is provided between the recessed portion 9 and a corresponding recessed portion 10 provided on the case 11. The bevel gear bearing portion 8 is designed to be inserted.

The small bevel gear bearing portion 8 is integrated with the handle joint 12 and is supported by the recesses 9 and 10.

When a pressing piece 11 a is provided on the lower edge joint surface of the case 11 and the joint surface of the bed 2 and the joint surface of the case 11 are joined by sandwiching a small bevel gear and tightened and fixed by a bolt 13, The peripheral edge of the bed 1 received on the stepped portion 3a is pressed and fixed.

In the central recess 1b of the bed 1, a circular first bearing body 14 around which a collar 14a is provided is placed. Further, a cylindrical second bearing 15 is placed on the first bearing body 14, and a large bevel gear 6 to which the main screw shaft 5 is attached is placed on the second bearing body 15 for bearing. ing.

An auxiliary screw cylinder 16 is provided in mesh with the main screw shaft 5, and an auxiliary lifting mechanism in which an inner cylinder 17 is meshed with the auxiliary screw cylinder 16 is provided in the case 11.

[0015]

[Effect of device]

 As explained above, the screw jack of the present invention can be made lighter by securing the strength by using steel plates for the load part that receives the load and securing the ground surface by the bed that uses the aluminum material for the ground area. Furthermore, the bearing portion of the small bevel gear can be made finer, and by integrating it with the handle joint, the number of parts can be reduced and the weight can be reduced.

[Brief description of drawings]

1 shows an embodiment of a screw jack according to the present invention, which is a partially cutaway side view.

FIG. 2 is a partial side view showing a joint portion of FIG.

[Explanation of symbols]

 1, 2 Beds 1a, 2a Bottom surface 1b Recessed portion 3 Perforated 3a Stepped portion 4 Rising wall 4a Upper edge joint surface 5 Main screw shaft 6 Large bevel gear 7 Small bevel gear 8 Small bevel gear bearing portion 9, 10 Sliding recessed portion 11 Case 11a Pressing piece 12 Handle joint 13 Bolt 14 First bearing body 14a Collar 15 Second bearing body 16 Auxiliary screw cylinder 17 Inner cylinder A bed

Claims (1)

[Scope of utility model registration request] 1. A large bevel gear in which a lower end of a main screw shaft is connected upright to a bed center through a bearing is mounted, and further, the large bevel gear is meshed with a small bevel gear rotated by external driving means. In a screw jack for rotating a small bevel gear to a main screw shaft through a large bevel gear to rotate a body to be suspended, the bed is a bed using a steel plate, and a window hole is formed in the center. , The bed is divided into beds using an aluminum material for accommodating the steel plate bed in the window hole, and the aluminum material bed is provided with a rising wall around the window hole,
The upper edge of this rising wall is made horizontal to the position of the central axis of the main screw shaft, and is further formed into an inclined surface along the bearing center line of the small bevel gear from the remaining central axis position so as to correspond to the upper surface of this bed. The lower surface of the case is stacked on the bed upper surface, and the steel plate bed is pressed by the pressing piece from the lower surface of the case,
Further, a recess for holding the bearing member of the small bevel gear is formed in a part of each of the upper and lower edges, and the bearing member positioned in the recess is sandwiched to join the case and the bed to fix them in place. A screw jack that has been characterized.